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电化学  2011 

包覆型Si/C复合材料的制备及其性能研究

, PP. 139-143

Keywords: 锂离子电池,,高温热解法

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Abstract:

分别采用球磨法和高温热解法制备了Si/C复合材料,XRD、SEM、电化学阻抗谱、循环伏安法和恒流充放电测试表征该Si/C复合材料的结构、形貌和电化学性能.结果表明,相比于球磨法,高温热解HDPE制备的Si/C复合材料颗粒形貌规则,碳的包覆较为均匀,导电性较好,阻抗较小.该复合材料首次嵌锂容量为4495mAh/g,首次库仑效率65.3%,从第2周开始库仑电效率都保持在97%左右,经过100次充放电循环后仍能达到438mAh/g的可逆容量,具有较好的电化学循环稳定性.

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