Carbon-coated nano-Si dispersed oxides/graphite composites as anode material for lithium ion batteries
Carbon-coated nano-Si dispersed oxides/graphite composites as anode material for lithium ion batteries
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DOI：
10.1016/j.elecom.2004.03.005
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发表时间：
2004-05-01
影响因子：
5.4
通讯作者：
Lee, SM
中科院分区：
文献类型：
--
作者：
Lee, HY;Lee, SM
制备了一种碳包覆纳米硅分散氧化物/石墨复合材料，并对其作为锂离子电池负极材料进行了研究。采用A1对sio2进行机械化学还原法制备了纳米硅分散氧化物，并在900℃的氩气中热解煤焦油沥青，将碳包覆在纳米硅分散氧化物/石墨的球磨混合物上。碳包覆复合材料具有良好的循环性能和合理的第一不可逆容量。优异的电化学性能归功于纳米Si相的均匀分布、石墨的缓冲作用以及碳涂层增强了电子和离子传导的连接。(C) 2004 Elsevier B.V.版权所有
A carbon-coated nano-Si dispersed oxides/graphite composite has been prepared and investigated as a potential anode material for lithium ion batteries. The nano-Si dispersed oxides were synthesized by mechanochemical reduction of SiO by A1, and carbon has been coated onto the ball milled mixture of nano-Si dispersed oxide/graphite by utilizing pyrolysis of coal-tar pitch at 900degreesC in an argon flow. The carbon-coated composites show excellent cycling performance with a reasonable value of the first irreversible capacity. The superior electrochemical characteristics are attributed to the uniform distribution of nano-sized Si phase, the buffering action of graphite and an enhanced connection for electronic and ionic conduction by carbon-coating. (C) 2004 Elsevier B.V. All rights reserved.