Carbon coating of Li4Ti5O12 using amphiphilic carbonaceous material for improvement of lithium-ion battery performance
Carbon coating of Li4Ti5O12 using amphiphilic carbonaceous material for improvement of lithium-ion battery performance
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DOI：
10.1016/j.jpowsour.2012.04.097
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发表时间：
2012-09
影响因子：
9.2
通讯作者：
Xuefei Guo;Cheng-yang Wang;Mingming Chen;Jiuzhou Wang;Jiaming Zheng
中科院分区：
文献类型：
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作者：
Xuefei Guo;Cheng-yang Wang;Mingming Chen;Jiuzhou Wang;Jiaming Zheng
采用两亲性碳质材料（ACM）对水热合成的Li 4 Ti 5 O 12微粒进行碳包覆，然后在800°C下碳化2 h。所制备的颗粒由高度结晶的尖晶石型Li 4 Ti 5 O 12组成，尺寸在100- 400 nm范围内，没有任何团聚，其表面均匀地覆盖有薄碳层。评价了它们作为锂离子电池负极的电化学性能。碳包覆的Li 4 Ti 5 O 12在20 C倍率下的首次放电容量为137 mAhg-1，100次循环后仍保持高达125 mAhg-1（保持率为91%），表现出良好的倍率性能和循环性能。以ACM为碳前驱体对Li 4 Ti 5 O 12颗粒进行碳包覆，提高了其导电性、极化和分散性，从而提高了其作为锂离子电池负极的性能。这种非有机包覆工艺为制备碳包覆Li 4 Ti 5 O 12作为高功率锂离子电池负极材料提供了一条经济、简便、绿色的新途径。
Carbon coating of fine particles of Li4Ti5O12synthesized under hydrothermal condition is carried out by amphiphilic carbonaceous material (ACM) in aqueous solution, followed by carbonization at 800°C for 2h. The particles prepared are comprised of highly-crystalline spinel-type Li4Ti5O12with the size in the range of 100–400nm without any agglomeration, of which surface is uniformly covered by a thin carbon layer. Their electrochemical performance as an anode in lithium-ion batteries is evaluated. The initial discharge capacity of carbon-coated Li4Ti5O12at 20C rate is 137mAhg−1and remains as high as 125mAhg−1after 100 cycles (91% retention), exhibiting good rate and cyclic performance. Carbon coating by using ACM as carbon precursor gives the Li4Ti5O12particles an enhanced performance as an anode in lithium-ion batteries, owing to the improvement in electrical conductivity, polarization and ability of dispersion. This non-organic coating process may present a new economic, facile, and green pathway for the preparation of carbon-coated Li4Ti5O12as a high power anode material in lithium-ion batteries.