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共生Li3PO4对LiFePO4电化学性能的影响
作者:刘战强 陈海杰 唐宇峰 黄富强 
单位:中国科学院上海硅酸盐研究所 中国科学院能量转换材料重点实验室 上海 200050 
关键词:复合物 磷酸锂铁 锂电池 阴极 电化学性能 
分类号:TQ050.4
出版年,卷(期):页码:2011,39(4):7-10
DOI:
摘要:

采用固相法制备出xLi3PO4/LiFePO4/C (x = 0,0.025,0.05,0.10,0.15,0.20,0.50)复合锂离子电池阴极材料。电化学充放电测试显示,0.025Li3PO4/LiFePO4/C材料的性能优于同时制备的对比样品LiFePO4/C的。0.025Li3PO4/LiFePO4/C材料以0.1 C倍率的首次放电容量可达158.7 mA·h/g,以1 C倍率充放65次后容量可保持在139.3 mA·h/g。循环伏安测试及交流阻抗测试结果与电化学充放电测试结果一致,说明少量共生的Li3PO4可以改善LiFePO4的电化学性能。

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The composite cathode materials of xLi3PO4/LiFePO4/C (x = 0, 0.025, 0.05, 0.10, 0.15, 0.20, 0.50) based on LiFePO4 for lithium battery were prepared by a solid state reaction method. The galvanostatic charge/discharge analysis indicated that the electrochemical capabilities of 0.025Li3PO4/LiFePO4/C was better than that of LiFePO4/C synthesized in the same way. A higher discharge capacity of 158.7 mA·h/g could be obtained by 0.025Li3PO4/LiFePO4/C in the first cycle at the rate of 0.1 C, and a capacity of 139.3 mA·h/g could be held after 65 cycles at the rate of 1 C. The electrochemical capacities of the obtained 0.025Li3PO4/LiFePO4/C were also investigated by cyclic voltammetry measurements and electrochemical impedance spectroscopy. The results are consistent with galvanostatic charge/discharge analysis which indicates that Li3PO4 can improve the electrochemical property of LiFePO4.

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基金项目:
国家自然科学基金 (20901083);上海市科委纳米专项(0952- nm06500)资助项目。
作者简介:
硕士,助理研究员
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参考文献:

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