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电化学  2012 

锂离子电池负极材料Li4Ti5O12的半固相法制备及碳包覆改性

, PP. 342-347

Keywords: 半固相法,Li4Ti5O12,碳包覆,锂离子电池

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Abstract:

由半固相法制得锂离子电池负极材料Li4Ti5O12,并研究了Li4Ti5O12的碳包覆改性.采用XRD、SEM、TEM以及HRTEM观察分析产物的相结构与形貌.使用恒流充放电、循环伏安法和交流阻抗技术测试了材料的电化学性质.结果表明,Li4Ti5O12电化学性能因颗粒团聚严重下降,该电极在0.1C和0.5C首周期放电容量分别为121.7和87.6mAh?g-1;碳包覆Li4Ti5O12/C材料呈球形分布,能抑制颗粒团聚,该电极倍率<0.5C的放电比容量大于180mAh?g-1,超过Li4Ti5O12的理论放电比容量(175mAh?g-1);在1C、5C和10C倍率下,其容量仍保持在136、79.9和58.3mAh?g-1,碳包覆改性材料具有优异的循环寿命和高倍率性能.

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