{"id":3014,"date":"2025-03-28T10:38:27","date_gmt":"2025-03-28T02:38:27","guid":{"rendered":"https:\/\/calcium-carbonate.epic-powder.com\/?p=3014"},"modified":"2025-03-28T10:38:30","modified_gmt":"2025-03-28T02:38:30","slug":"porous-carbon-why-it-is-called-a-new-opportunity-for-carbon-based-materials%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/calcium-carbonate.epic-powder.com\/vi\/porous-carbon-why-it-is-called-a-new-opportunity-for-carbon-based-materials%ef%bc%9f\/","title":{"rendered":"Carbon x\u1ed1p: T\u1ea1i sao n\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u01a1 h\u1ed9i m\u1edbi cho v\u1eadt li\u1ec7u g\u1ed1c carbon?"},"content":{"rendered":"<p>V\u1eadt li\u1ec7u anode r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi pin lithium-ion v\u00e0 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a pin. Graphite, anode g\u1ed1c carbon \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u nh\u1ea5t, c\u00f3 dung l\u01b0\u1ee3ng th\u1ea5p v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh k\u00e9m. \u0110\u1ed9 an to\u00e0n v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed1c \u0111\u1ed9 c\u1ee7a n\u00f3 kh\u00f3 c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n.<br>Tr\u1ecdng t\u00e2m nghi\u00ean c\u1ee9u l\u00e0 t\u00ecm ki\u1ebfm v\u1eadt li\u1ec7u m\u1edbi g\u1ed1c carbon \u0111\u1ec3 thay th\u1ebf anot th\u01b0\u01a1ng m\u1ea1i.<br>Trong s\u1ed1 c\u00e1c v\u1eadt li\u1ec7u cacbon,<a href=\"https:\/\/calcium-carbonate.epic-powder.com\/vi\/machines\/ball-mill\/\"> cacbon x\u1ed1p<\/a> c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn v\u00e0 h\u00ecnh th\u00e1i c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c. C\u1ea5u tr\u00fac l\u1ed7 r\u1ed7ng phong ph\u00fa v\u00e0 \u0111\u1ed9 d\u1eabn \u0111i\u1ec7n t\u1ed1t gi\u00fap t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 gi\u1ea3m chi ph\u00ed t\u1ed5ng h\u1ee3p. Carbon x\u1ed1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong l\u01b0u tr\u1eef n\u0103ng l\u01b0\u1ee3ng v\u00e0 x\u00fac t\u00e1c. Ti\u1ec1m n\u0103ng c\u1ee7a n\u00f3 trong pin lithium l\u00e0 r\u1ea5t l\u1edbn\u2014h\u00e3y c\u00f9ng kh\u00e1m ph\u00e1 th\u00eam.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u01afu \u0111i\u1ec3m c\u1ee7a v\u1eadt li\u1ec7u cacbon x\u1ed1p cho pin lithium<\/h2>\n\n\n\n<p>Pin lithium-ion s\u1eed d\u1ee5ng ion lithium l\u00e0m ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n n\u0103ng l\u01b0\u1ee3ng v\u00e0 c\u00e1c \u0111i\u1ec7n c\u1ef1c \u0111\u01b0\u1ee3c nh\u00fang c\u00e1c c\u01a1 ch\u1ebf l\u01b0u tr\u1eef lithium \u0111i\u1ec7n h\u00f3a. Khi s\u1ea1c, c\u00e1c ion lithium \u0111\u01b0\u1ee3c t\u1ea1o ra tr\u00ean \u0111i\u1ec7n c\u1ef1c d\u01b0\u01a1ng c\u1ee7a pin. C\u00e1c ion lithium \u0111\u01b0\u1ee3c t\u1ea1o ra \u0111\u01b0\u1ee3c t\u00e1ch kh\u1ecfi \u0111i\u1ec7n c\u1ef1c d\u01b0\u01a1ng v\u00e0 di chuy\u1ec3n \u0111\u1ebfn \u0111i\u1ec7n c\u1ef1c \u00e2m th\u00f4ng qua ch\u1ea5t \u0111i\u1ec7n ph\u00e2n. V\u1eadt li\u1ec7u carbon l\u00e0m \u0111i\u1ec7n c\u1ef1c \u00e2m c\u00f3 c\u1ea5u tr\u00fac nhi\u1ec1u l\u1edbp v\u00e0 c\u00f3 nhi\u1ec1u l\u1ed7 si\u00eau nh\u1ecf. C\u00e1c ion lithium \u0111\u1ebfn \u0111i\u1ec7n c\u1ef1c \u00e2m \u0111\u01b0\u1ee3c nh\u00fang trong c\u00e1c l\u1ed7 si\u00eau nh\u1ecf c\u1ee7a v\u1eadt li\u1ec7u carbon. <\/p>\n\n\n\n<p>C\u00e0ng nhi\u1ec1u ion lithium \u0111\u01b0\u1ee3c nh\u00fang, kh\u1ea3 n\u0103ng s\u1ea1c c\u00e0ng cao. L\u00fac n\u00e0y, \u0111i\u1ec7n c\u1ef1c \u00e2m gi\u00e0u lithium, \u0111i\u1ec7n c\u1ef1c d\u01b0\u01a1ng ngh\u00e8o lithium. \u0110\u1ed3ng th\u1eddi, \u0111i\u1ec7n t\u00edch b\u00f9 electron s\u1ebd \u0111\u01b0\u1ee3c cung c\u1ea5p cho \u0111i\u1ec7n c\u1ef1c \u00e2m carbon t\u1eeb m\u1ea1ch ngo\u00e0i, do \u0111\u00f3 \u0111\u1ea3m b\u1ea3o c\u00e2n b\u1eb1ng \u0111i\u1ec7n t\u00edch c\u1ee7a \u0111i\u1ec7n c\u1ef1c \u00e2m. Trong qu\u00e1 tr\u00ecnh x\u1ea3, c\u00e1c ion lithium r\u1eddi kh\u1ecfi anot v\u00e0 \u0111\u01b0a tr\u1edf l\u1ea1i catot th\u00f4ng qua ch\u1ea5t \u0111i\u1ec7n ph\u00e2n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"555\" src=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Lithium-ion-battery-working-principle-diagram.webp\" alt=\"S\u01a1 \u0111\u1ed3 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a pin lithium-ion\" class=\"wp-image-3015\" srcset=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Lithium-ion-battery-working-principle-diagram.webp 700w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Lithium-ion-battery-working-principle-diagram-300x238.webp 300w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Lithium-ion-battery-working-principle-diagram-15x12.webp 15w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p>L\u00e0 m\u1ed9t c\u1ef1c d\u01b0\u01a1ng c\u1ee7a pin lithium-ion, di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn c\u1ee7a carbon x\u1ed1p li\u00ean k\u1ebft nhi\u1ec1u ion lithium h\u01a1n \u0111\u1ec3 c\u00f3 dung l\u01b0\u1ee3ng cao h\u01a1n. C\u1ea5u tr\u00fac l\u1ed7 x\u1ed1p ph\u1ee9c t\u1ea1p c\u1ee7a n\u00f3 cung c\u1ea5p c\u00e1c \u0111\u01b0\u1eddng khu\u1ebfch t\u00e1n hi\u1ec7u qu\u1ea3 v\u00e0 r\u00fat ng\u1eafn kho\u1ea3ng c\u00e1ch khu\u1ebfch t\u00e1n ion lithium. C\u00e1c khuy\u1ebft t\u1eadt nh\u01b0 ch\u1ed7 tr\u1ed1ng v\u00e0 pha t\u1ea1p nguy\u00ean t\u1eed kh\u00e1c nhau \u0111\u00f3ng vai tr\u00f2 l\u00e0 c\u00e1c v\u1ecb tr\u00ed l\u01b0u tr\u1eef lithium. Trong qu\u00e1 tr\u00ecnh ch\u00e8n\/tr\u00edch xu\u1ea5t lithium, \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc t\u1eeb c\u00e1c thay \u0111\u1ed5i th\u1ec3 t\u00edch l\u00e0 t\u1ed1i thi\u1ec3u, \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh chu k\u1ef3 t\u1ed1t. Do \u0111\u00f3, carbon x\u1ed1p th\u01b0\u1eddng th\u1ec3 hi\u1ec7n hi\u1ec7u su\u1ea5t \u0111i\u1ec7n h\u00f3a t\u1ed1t h\u01a1n than ch\u00ec truy\u1ec1n th\u1ed1ng.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"616\" height=\"468\" src=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Microporous-lithium-storage-mechanism.webp\" alt=\"C\u01a1 ch\u1ebf l\u01b0u tr\u1eef lithium vi x\u1ed1p\" class=\"wp-image-3016\" srcset=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Microporous-lithium-storage-mechanism.webp 616w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Microporous-lithium-storage-mechanism-300x228.webp 300w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Microporous-lithium-storage-mechanism-16x12.webp 16w\" sizes=\"(max-width: 616px) 100vw, 616px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00edch th\u01b0\u1edbc l\u1ed7 r\u1ed7ng t\u1ed1i \u01b0u cho carbon x\u1ed1p l\u00e0 bao nhi\u00eau?<\/h2>\n\n\n\n<p>Carbon x\u1ed1p c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chia th\u00e0nh ba lo\u1ea1i theo k\u00edch th\u01b0\u1edbc l\u1ed7: carbon vi x\u1ed1p (k\u00edch th\u01b0\u1edbc l\u1ed7 nh\u1ecf h\u01a1n 2nm), carbon x\u1ed1p trung b\u00ecnh (k\u00edch th\u01b0\u1edbc l\u1ed7 t\u1eeb 2~50nm) v\u00e0 carbon x\u1ed1p l\u1edbn (k\u00edch th\u01b0\u1edbc l\u1ed7 l\u1edbn h\u01a1n 50nm).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Carbon vi x\u1ed1p<\/h3>\n\n\n\n<p>Carbon vi x\u1ed1p c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ri\u00eang cao v\u00e0 th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng ri\u00eang cao nh\u01b0 m\u1ed9t v\u1eadt li\u1ec7u \u0111i\u1ec7n c\u1ef1c. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 chu\u1ea9n b\u1ecb carbon vi x\u1ed1p c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o m\u1eabu.<br>L\u00e0 m\u1ed9t c\u1ef1c d\u01b0\u01a1ng c\u1ee7a pin lithium-ion, n\u00f3 cho th\u1ea5y dung l\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c l\u1edbn (2547 mA\u00b7h\/g). \u0110i\u1ec1u n\u00e0y l\u00e0 do di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t l\u1edbn l\u00e0m t\u0103ng di\u1ec7n t\u00edch h\u00ecnh th\u00e0nh SEI.<br>Ngo\u00e0i ra, n\u00f3 cung c\u1ea5p nhi\u1ec1u v\u1ecb tr\u00ed li\u00ean k\u1ebft h\u01a1n cho c\u00e1c nh\u00f3m ch\u1ee9c n\u0103ng ch\u1ee9a oxy v\u00e0 hydro. C\u00e1c nh\u00f3m ch\u1ee9c n\u0103ng n\u00e0y tr\u1ea3i qua c\u00e1c ph\u1ea3n \u1ee9ng kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c v\u1edbi c\u00e1c ion lithium, d\u1eabn \u0111\u1ebfn dung l\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c cao. S\u1ef1 suy gi\u1ea3m dung l\u01b0\u1ee3ng \u0111\u00e1ng k\u1ec3 \u0111\u01b0\u1ee3c quan s\u00e1t th\u1ea5y trong c\u00e1c chu k\u1ef3 ban \u0111\u1ea7u. Do \u0111\u00f3, carbon vi x\u1ed1p c\u1ea5u tr\u00fac \u0111\u01a1n kh\u00f4ng ph\u1ea3i l\u00e0 v\u1eadt li\u1ec7u anot pin lithium-ion l\u00fd t\u01b0\u1edfng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cacbon x\u1ed1p trung b\u00ecnh<\/h3>\n\n\n\n<p>Carbon mesoporous c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u c\u1ef1c d\u01b0\u01a1ng cho pin lithium-ion.<br>S\u1eed d\u1ee5ng silica c\u00f3 tr\u1eadt t\u1ef1 l\u00e0m khu\u00f4n m\u1eabu, c\u00f3 th\u1ec3 t\u1ed5ng h\u1ee3p carbon mesoporous c\u00f3 tr\u1eadt t\u1ef1 (CMK-3). N\u00f3 th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng \u0111\u1ea3o ng\u01b0\u1ee3c cao v\u00e0 hi\u1ec7u su\u1ea5t chu k\u1ef3 s\u1ea1c-x\u1ea3 tuy\u1ec7t v\u1eddi. Sau chu k\u1ef3 \u0111\u1ea7u ti\u00ean, kh\u1ea3 n\u0103ng s\u1ea1c-x\u1ea3 v\u1eabn \u1ed5n \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y l\u00e0 do c\u1ea5u tr\u00fac x\u1ed1p c\u00f3 tr\u1eadt t\u1ef1 gi\u1ea3m thi\u1ec3u s\u1ee9c c\u1ea3n v\u1eadn chuy\u1ec3n ion, d\u1eabn \u0111\u1ebfn \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh chu k\u1ef3 v\u01b0\u1ee3t tr\u1ed9i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cacbon x\u1ed1p l\u1edbn<\/h3>\n\n\n\n<p>Carbon x\u1ed1p c\u00f3 tr\u1eadt t\u1ef1 \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p khu\u00f4n m\u1eabu c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u c\u1ef1c d\u01b0\u01a1ng cho pin lithium-ion.<br>S\u1eed d\u1ee5ng opal silica ng\u01b0\u1ee3c l\u00e0m khu\u00f4n m\u1eabu, carbon x\u1ed1p c\u00f3 tr\u1eadt t\u1ef1 v\u1edbi c\u1ea5u tr\u00fac l\u1ed7 r\u1ed7ng li\u00ean k\u1ebft 3D v\u00e0 th\u00e0nh l\u1ed7 r\u1ed7ng d\u1ea1ng than ch\u00ec c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p th\u00f4ng qua ph\u01b0\u01a1ng ph\u00e1p l\u1eafng \u0111\u1ecdng h\u01a1i h\u00f3a h\u1ecdc (CVD) s\u1eed d\u1ee5ng benzen.<br>V\u1edbi t\u01b0 c\u00e1ch l\u00e0 c\u1ef1c d\u01b0\u01a1ng c\u1ee7a pin lithium-ion, n\u00f3 duy tr\u00ec dung l\u01b0\u1ee3ng 320 mA\u00b7h\/g sau 60 chu k\u1ef3 \u1edf m\u1ee9c 200 mA\/g, v\u1edbi t\u1ef7 l\u1ec7 duy tr\u00ec dung l\u01b0\u1ee3ng 98%.<br>S\u1eed d\u1ee5ng polymethyl methacrylate (PMMA) l\u00e0m khu\u00f4n m\u1eabu, v\u1eadt li\u1ec7u x\u1ed1p c\u00f3 tr\u1eadt t\u1ef1 3D c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p th\u00f4ng qua ph\u01b0\u01a1ng ph\u00e1p sol-gel resorcinol-formaldehyde.<br>V\u1edbi t\u01b0 c\u00e1ch l\u00e0 v\u1eadt li\u1ec7u anot, n\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u00f4ng su\u1ea5t 260 mA\u00b7h\/g \u1edf 1000 mA\/g, v\u1edbi kh\u1ea3 n\u0103ng duy tr\u00ec c\u00f4ng su\u1ea5t 83% sau 30 chu k\u1ef3.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ph\u00e2n lo\u1ea1i x\u1ed1p<\/h3>\n\n\n\n<p>Tuy nhi\u00ean, v\u1eadt li\u1ec7u carbon x\u1ed1p c\u00f3 c\u1ea5u tr\u00fac m\u1ed9t l\u1ed7 r\u1ed7ng ch\u1eafc ch\u1eafn c\u00f3 m\u1ed9t s\u1ed1 nh\u01b0\u1ee3c \u0111i\u1ec3m.<br>\u0110\u1ec3 n\u00e2ng cao hi\u1ec7u su\u1ea5t c\u1ee7a ch\u00fang, carbon x\u1ed1p ph\u00e2n c\u1ea5p\u2014t\u00edch h\u1ee3p c\u00e1c l\u1ed7 r\u1ed7ng li\u00ean k\u1ebft v\u1edbi nhau c\u00f3 k\u00edch th\u01b0\u1edbc kh\u00e1c nhau trong m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n lo\u1ea1i\u2014\u0111\u00e3 tr\u1edf th\u00e0nh tr\u1ecdng t\u00e2m nghi\u00ean c\u1ee9u. C\u00e1c l\u1ee3i th\u1ebf k\u1ebft h\u1ee3p nh\u01b0 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C\u00e1c l\u1ed7 nh\u1ecf cung c\u1ea5p di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ri\u00eang cao, t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng l\u01b0u tr\u1eef \u0111i\u1ec7n t\u00edch v\u00e0 t\u0103ng dung l\u01b0\u1ee3ng pin lithium-ion. <\/li>\n\n\n\n<li>C\u00e1c l\u1ed7 trung b\u00ecnh t\u1ea1o ra c\u00e1c k\u00eanh v\u1eadn chuy\u1ec3n nhanh cho c\u00e1c ion \u0111i\u1ec7n ph\u00e2n, c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng th\u1ea9m th\u1ea5u \u0111i\u1ec7n ph\u00e2n.<\/li>\n\n\n\n<li>C\u00e1c l\u1ed7 r\u1ed7ng l\u1edbn r\u00fat ng\u1eafn kho\u1ea3ng c\u00e1ch khu\u1ebfch t\u00e1n ion, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho vi\u1ec7c v\u1eadn chuy\u1ec3n ion v\u00e0 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng duy tr\u00ec dung l\u01b0\u1ee3ng cao trong \u0111i\u1ec1u ki\u1ec7n d\u00f2ng \u0111i\u1ec7n cao.<\/li>\n<\/ul>\n\n\n\n<p><strong>V\u00ed d\u1ee5:<\/strong><\/p>\n\n\n\n<p>Ch\u1ec9 c\u1ea7n \u0111un n\u00f3ng liti cacbonat v\u00e0 liti hi\u0111rua, cacbon x\u1ed1p ph\u00e2n c\u1ea5p gi\u1ed1ng b\u1ecdt bi\u1ec3n (HPC gi\u1ed1ng b\u1ecdt bi\u1ec3n) c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ri\u00eang c\u1ef1c cao (1049 m\u00b2\/g) \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p theo c\u00e1ch th\u00e2n thi\u1ec7n v\u1edbi m\u00f4i tr\u01b0\u1eddng v\u00e0 hi\u1ec7u qu\u1ea3, nh\u01b0 th\u1ec3 hi\u1ec7n trong h\u00ecnh.<\/p>\n\n\n\n<p>Khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u c\u1ef1c d\u01b0\u01a1ng cho pin lithium-ion, HPC d\u1ea1ng b\u1ecdt bi\u1ec3n th\u1ec3 hi\u1ec7n:<\/p>\n\n\n\n<p>C\u00f4ng su\u1ea5t \u0111\u1ea3o ng\u01b0\u1ee3c c\u1ef1c cao (1750 mA\u00b7h\/g \u1edf 0,2 A\/g), \u0110\u1ed9 \u1ed5n \u0111\u1ecbnh chu k\u1ef3 \u0111\u1eb7c bi\u1ec7t (duy tr\u00ec c\u00f4ng su\u1ea5t \u2248100% sau 2000 chu k\u1ef3), Hi\u1ec7u su\u1ea5t t\u1ed1c \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i.<\/p>\n\n\n\n<p>Carbon x\u1ed1p ph\u00e2n c\u1ea5p c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ebfn \u0111\u1ed5i th\u00f4ng qua qu\u00e1 tr\u00ecnh pha t\u1ea1p nguy\u00ean t\u1eed d\u1ecb lo\u1ea1i, trong \u0111\u00f3 m\u1ed9t s\u1ed1 nguy\u00ean t\u1eed carbon trong c\u1ea5u tr\u00fac x\u1ed1p \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng c\u00e1c nguy\u00ean t\u1eed kh\u00e1c. B\u1eb1ng c\u00e1ch khai th\u00e1c s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 \u0111\u1ed9 \u00e2m \u0111i\u1ec7n gi\u1eefa carbon v\u00e0 c\u00e1c nguy\u00ean t\u1eed l\u1ea1, qu\u00e1 tr\u00ecnh bi\u1ebfn \u0111\u1ed5i n\u00e0y \u0111i\u1ec1u ch\u1ec9nh s\u1ef1 ph\u00e2n b\u1ed1 \u0111i\u1ec7n t\u00edch v\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh khuy\u1ebft t\u1eadt b\u00ean trong carbon x\u1ed1p, c\u1ea3i thi\u1ec7n c\u00e1c \u0111\u1eb7c t\u00ednh l\u00fd h\u00f3a c\u1ee7a n\u00f3.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"872\" height=\"343\" src=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Preparation-and-synthesis-mechanism-of-sponge-like-hierarchical-porous-carbon.webp\" alt=\"C\u01a1 ch\u1ebf chu\u1ea9n b\u1ecb v\u00e0 t\u1ed5ng h\u1ee3p cacbon x\u1ed1p ph\u00e2n c\u1ea5p gi\u1ed1ng b\u1ecdt bi\u1ec3n\" class=\"wp-image-3017\" srcset=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Preparation-and-synthesis-mechanism-of-sponge-like-hierarchical-porous-carbon.webp 872w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Preparation-and-synthesis-mechanism-of-sponge-like-hierarchical-porous-carbon-300x118.webp 300w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Preparation-and-synthesis-mechanism-of-sponge-like-hierarchical-porous-carbon-768x302.webp 768w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/Preparation-and-synthesis-mechanism-of-sponge-like-hierarchical-porous-carbon-18x7.webp 18w\" sizes=\"(max-width: 872px) 100vw, 872px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Carbon x\u1ed1p c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng ti\u1ec1m n\u0103ng<\/h2>\n\n\n\n<p>Trong nghi\u00ean c\u1ee9u, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ph\u00e1t tri\u1ec3n m\u1ed9t m\u00e0ng carbon x\u1ed1p b\u1eb1ng c\u00e1ch th\u00eam Fe3C \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1c l\u1ed7 r\u1ed7ng h\u00ecnh t\u1ed5 ong v\u00e0 h\u00ecnh ng\u00f3n tay. M\u00e0ng carbon x\u1ed1p n\u00e0y \u0111\u1ea1t \u0111\u01b0\u1ee3c di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ri\u00eang cao. N\u00f3 c\u00f3 th\u1ec3 tr\u1ef1c ti\u1ebfp \u0111\u00f3ng vai tr\u00f2 l\u00e0 v\u1eadt li\u1ec7u ho\u1ea1t \u0111\u1ed9ng v\u00e0 b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n. C\u00e1c l\u1ed7 r\u1ed7ng l\u1edbn cung c\u1ea5p \u0111\u1ee7 kh\u00f4ng gian b\u00ean trong \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nh\u1eefng thay \u0111\u1ed5i v\u1ec1 th\u1ec3 t\u00edch trong qu\u00e1 tr\u00ecnh s\u1ea1c\/x\u1ea3. M\u00e0ng carbon x\u1ed1p kh\u00f4ng \u0111\u1ed1i x\u1ee9ng cung c\u1ea5p kh\u1ea3 n\u0103ng v\u1eadn chuy\u1ec3n electron t\u1ed1c \u0111\u1ed9 cao v\u00e0 th\u00fac \u0111\u1ea9y s\u1ef1 khu\u1ebfch t\u00e1n ch\u1ea5t \u0111i\u1ec7n ph\u00e2n v\u00e0 ion lithium.<br><\/p>\n\n\n\n<p>M\u1eb7c d\u00f9 carbon x\u1ed1p c\u00f3 th\u1ec3 kh\u00f4ng b\u1eb1ng c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 \u1ed1ng nano carbon ho\u1eb7c graphene v\u1ec1 \u0111\u1ed9 linh ho\u1ea1t v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc, nh\u01b0ng \u0111\u00e2y l\u00e0 l\u1ef1a ch\u1ecdn l\u00fd t\u01b0\u1edfng cho t\u1ea3i kh\u1ed1i l\u01b0\u1ee3ng \u0111i\u1ec7n c\u1ef1c l\u1edbn.<br>Nghi\u00ean c\u1ee9u trong t\u01b0\u01a1ng lai c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 vi\u1ec7c k\u1ebft h\u1ee3p carbon x\u1ed1p v\u1edbi graphene ho\u1eb7c \u1ed1ng nano carbon. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 t\u1ea1o ra b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n pin lithium-ion linh ho\u1ea1t v\u01b0\u1ee3t tr\u1ed9i cho c\u00e1c thi\u1ebft b\u1ecb \u0111eo \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ph\u1ea7n k\u1ebft lu\u1eadn<\/h2>\n\n\n\n<p>C\u00e1c nh\u00e0 khoa h\u1ecdc tin r\u1eb1ng carbon x\u1ed1p c\u00f3 ti\u1ec1m n\u0103ng l\u1edbn \u0111\u1ec3 s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c \u0111i\u1ec7n c\u1ef1c t\u1ef1 h\u1ed7 tr\u1ee3 v\u00e0 b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n. \u0110i\u1ec1u n\u00e0y l\u00e0 do s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a pin lithium-ion th\u1ebf h\u1ec7 ti\u1ebfp theo s\u1ebd t\u1eadp trung v\u00e0o dung l\u01b0\u1ee3ng cao h\u01a1n, tu\u1ed5i th\u1ecd d\u00e0i h\u01a1n, th\u00e2n thi\u1ec7n v\u1edbi m\u00f4i tr\u01b0\u1eddng h\u01a1n v\u00e0 chi ph\u00ed th\u1ea5p h\u01a1n. \u0110i\u1ec1u n\u00e0y s\u1ebd y\u00eau c\u1ea7u b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n ph\u1ea3i c\u00f3 hi\u1ec7u su\u1ea5t \u0111i\u1ec7n h\u00f3a \u1ed5n \u0111\u1ecbnh h\u01a1n, \u0111\u1ed9 d\u1eabn \u0111i\u1ec7n t\u1ed1t h\u01a1n, tr\u1ecdng l\u01b0\u1ee3ng nh\u1eb9 h\u01a1n v\u00e0 chi ph\u00ed th\u1ea5p h\u01a1n. H\u01a1n n\u1eefa, c\u00e1c thi\u1ebft b\u1ecb \u0111eo \u0111\u01b0\u1ee3c trong t\u01b0\u01a1ng lai s\u1ebd y\u00eau c\u1ea7u b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n c\u00f3 c\u1ea5u tr\u00fac linh ho\u1ea1t. Do \u0111\u00f3, so v\u1edbi b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n b\u1eb1ng kim lo\u1ea1i, b\u1ed9 thu d\u00f2ng \u0111i\u1ec7n nanocarbon c\u00f3 tri\u1ec3n v\u1ecdng r\u1ed9ng h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"525\" src=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/ball-milling-classifier-product-line.webp\" alt=\"d\u00f2ng s\u1ea3n ph\u1ea9m m\u00e1y ph\u00e2n lo\u1ea1i nghi\u1ec1n bi\" class=\"wp-image-3018\" srcset=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/ball-milling-classifier-product-line.webp 700w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/ball-milling-classifier-product-line-300x225.webp 300w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/ball-milling-classifier-product-line-16x12.webp 16w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">b\u1ed9t EPIC<\/h2>\n\n\n\n<p><a href=\"https:\/\/calcium-carbonate.epic-powder.com\/vi\/\">B\u1ed9t Epic,<\/a>\u00a0H\u01a1n 20 n\u0103m kinh nghi\u1ec7m l\u00e0m vi\u1ec7c trong ng\u00e0nh b\u1ed9t si\u00eau m\u1ecbn. T\u00edch c\u1ef1c th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai c\u1ee7a b\u1ed9t si\u00eau m\u1ecbn, t\u1eadp trung v\u00e0o qu\u00e1 tr\u00ecnh nghi\u1ec1n, nghi\u1ec1n, ph\u00e2n lo\u1ea1i v\u00e0 s\u1eeda \u0111\u1ed5i b\u1ed9t si\u00eau m\u1ecbn. Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed v\u00e0 c\u00e1c gi\u1ea3i ph\u00e1p t\u00f9y ch\u1ec9nh! \u0110\u1ed9i ng\u0169 chuy\u00ean gia c\u1ee7a ch\u00fang t\u00f4i t\u1eadn t\u00e2m cung c\u1ea5p c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 d\u1ecbch v\u1ee5 ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u1ec3 t\u1ed1i \u0111a h\u00f3a gi\u00e1 tr\u1ecb ch\u1ebf bi\u1ebfn b\u1ed9t c\u1ee7a b\u1ea1n. Epic Powder\u2014Chuy\u00ean gia ch\u1ebf bi\u1ebfn b\u1ed9t \u0111\u00e1ng tin c\u1eady c\u1ee7a b\u1ea1n!<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"860\" height=\"484\" src=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/EPIC-POWDER.webp\" alt=\"B\u1ed8T EPIC\" class=\"wp-image-2991\" srcset=\"https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/EPIC-POWDER.webp 860w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/EPIC-POWDER-300x169.webp 300w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/EPIC-POWDER-768x432.webp 768w, https:\/\/calcium-carbonate.epic-powder.com\/wp-content\/uploads\/2025\/03\/EPIC-POWDER-18x10.webp 18w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><figcaption class=\"wp-element-caption\">B\u1ed8T EPIC<\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f16-o1\" lang=\"zh-CN\" dir=\"ltr\" data-wpcf7-id=\"16\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/vi\/wp-json\/wp\/v2\/posts\/3014#wpcf7-f16-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"\u7559\u8a00\u8868\u5355\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/vi\/wp-json\/wp\/v2\/posts\/3014#wpcf7-f16-o1\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"16\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.1.3\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"zh_CN\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f16-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<\/fieldset>\n<div class=\"keen-form\">\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"T\u00ean c\u1ee7a b\u1ea1n*\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Email c\u1ee7a b\u1ea1n*\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"pnone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-tel\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Pnone ho\u1eb7c Whatsapp c\u1ee7a b\u1ea1n*\" value=\"\" type=\"tel\" name=\"pnone\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-subject\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"C\u00f4ng ty c\u1ee7a b\u1ea1n\" value=\"\" type=\"text\" name=\"your-subject\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-message\"><textarea cols=\"40\" rows=\"3\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" placeholder=\"Tin nh\u1eafn c\u1ee7a b\u1ea1n\" name=\"your-message\"><\/textarea><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><input class=\"wpcf7-form-control wpcf7-submit has-spinner\" type=\"submit\" value=\"N\u1ed9p\" \/>\n\t\t<\/p>\n\t<\/div>\n<\/div>\n<style>\n.keen-form div{margin-bottom:5px;}\n.keen-form div p{margin-bottom:0px !important;}\n.one-half,.one-third {\n position: relative;\n margin-right: 4%;\n float: left;\n z-index: 99;\n}\n.one-half { width: 40%; }\n.one-third { width: 30.66%; }\n.last {\n margin-right: 0 !important;\n clear: right;\nwidth: 40%;\n}\n@media only screen and (max-width: 767px) {\n .one-half, .one-third {\n width: 90%;\n margin-right: 0;\n }\n}\n<\/style><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<input type=\"hidden\" name=\"trp-form-language\" value=\"vi\"\/><\/form>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>V\u1eadt li\u1ec7u anode r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi pin lithium-ion v\u00e0 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a pin. Graphite, anode g\u1ed1c carbon \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u nh\u1ea5t, c\u00f3 dung l\u01b0\u1ee3ng th\u1ea5p v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh k\u00e9m. \u0110\u1ed9 an to\u00e0n v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed1c \u0111\u1ed9 c\u1ee7a n\u00f3 kh\u00f3 c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n. T\u00ecm ki\u1ebfm v\u1eadt li\u1ec7u g\u1ed1c carbon m\u1edbi \u0111\u1ec3 thay th\u1ebf anode th\u01b0\u01a1ng m\u1ea1i l\u00e0 tr\u1ecdng t\u00e2m nghi\u00ean c\u1ee9u. Trong s\u1ed1 c\u00e1c v\u1eadt li\u1ec7u carbon, carbon x\u1ed1p c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t cao v\u00e0 h\u00ecnh th\u00e1i c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t \u0111\u01b0\u1ee3c. [\u2026]<\/p>","protected":false},"author":1,"featured_media":3019,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3014","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ultrafine-air-classifier"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Porous carbon : why it is called a new opportunity for carbon-based materials\uff1f<\/title>\n<meta name=\"description\" content=\"porous carbon has high surface area and controllable morphology. 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