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锂离子电池Sn-Co/C负极材料的制备与性能研究

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Keywords: Sn-Co/C复合材料,纳米结构,负极材料

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Abstract:

采用高温碳化裂解技术,并通过高能球磨处理,制备得到改性的高容量Sn-Co/C负极复合材料.采用X射线衍射技术测试材料的物相结构、利用扫描电镜测试材料的表面形貌.同时利用恒电流充放电和交流阻抗技术测试材料的电化学性能.结果表明,高能球磨处理后,Sn-Co/C出现非晶、纳米晶的混合组织.电极的首次放电和充电容量分别为1098.9mAhg-1和771.3mAhg-1,经40次循环后容量仍保持在425.1mAhg-1;改性Sn-Co/C具有更高的锂离子扩散系数,这有利于提高合金材料的充放电性能.

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