Carbon-coated graphite for anode of lithium ion rechargeable batteries: Graphite substrates for carbon coating
Carbon-coated graphite for anode of lithium ion rechargeable batteries: Graphite substrates for carbon coating
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DOI：
10.1016/j.jpowsour.2009.06.013
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发表时间：
2009-12-01
影响因子：
9.2
通讯作者：
Inagaki, Michio
中科院分区：
文献类型：
--
作者：
Ohta, Naoto;Nagaoka, Katsuhide;Inagaki, Michio
研究了合成石墨等4种石墨粉在锂离子二次电池中的负极性能。碳包覆合成石墨的不可逆容量约为20 mAh g（-1），在EC/DMC电解质溶液中的循环性能优于天然石墨，但其放电容量约为300 mAh g（-1），略低于天然石墨。即使在EC/PC=3/1的含PC溶液中，碳包覆合成石墨也具有与不含PC的溶液中几乎相同的阳极性能。研究发现，石墨颗粒上5%以上的碳涂层可有效改善-5摄氏度低温下的阳极性能，放电容量保持率高达约90%。在天然石墨粉末和合成石墨粉末两者上，发现在700-1000摄氏度的温度下以3-10质量%的量的碳涂层对于改善LIB中的阳极性能是最佳的，以具有比没有碳涂层更低的不可逆容量和在-5摄氏度下更高的放电容量保持率。(C)2009爱思唯尔有限公司版权所有。
Anode performance in lithium ion rechargeable batteries (LIBs) was studied on four kinds of graphite powders, including synthetic graphite. Carbon-coated synthetic graphite gave a smaller irreversible capacity of about 20 mAh g(-1) and a better cyclic performance in an electrolyte solution of EC/DMC than natural graphite, though its discharge capacity of about 300 mAh g(-1) is a little smaller than natural graphite. Even in a PC-containing solution as EC/PC=3/1, carbon-coated synthetic graphite had almost the same anode performance as in the solution without PC. Carbon coating of above 5 mass% on graphite particles was found to be effective to improve the anode performance at a low temperature of -5 degrees C, high retention in discharge capacity of about 90% being obtained. On both natural and synthetic graphite powders, carbon coating by the amount of 3-10 mass% at a temperature of 700-1000 degrees C was found to be optimum for the improvement of anode performance in LIBs, to have a lower irreversible capacity and higher retention in discharge capacity at -5 degrees C than without carbon coating. (C) 2009 Elsevier B.V. All rights reserved.