电极水分对磷酸铁锂电池性能的影响

doi:10.13208/j.electrochem.150749

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (5): 465-470. doi: 10.13208/j.electrochem.150749

• 电化学储能应用及产业化近期研究专辑 (厦门大学赵金保教授主编) • 上一篇下一篇

电极水分对磷酸铁锂电池性能的影响

牛俊婷¹，孙琳²，康书文²，赵政威²，马紫峰^1,2*

1. 上海交通大学化学工程系，上海电化学能源器件工程技术研究中心，上海 200240；2. 中聚电池研究院，上海 200241

出版日期:2015-10-28 发布日期:2015-10-28
通讯作者: 马紫峰 E-mail: zfma@sjtu.edu.cn
基金资助:
国家自然科学基金项目（No. 21336003）及上海市浦江人才计划（No. 13PJ1433500）

Impact of Water Content on the Performance of LiFePO4 Based Lithium-Ion Battery

NIU Jun-ting¹，SUN Lin²，KANG Shu-wen², ZHAO Zhen-wei², MA Zi-feng^1,2*

1. Shanghai Electrochemical Energy Devices Research Center, Department of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Sinopoly Battery Research Center, Shanghai 200241, China

Published:2015-10-28 Online:2015-10-28
Contact: MA Zi-feng E-mail: zfma@sjtu.edu.cn

摘要/Abstract

摘要：

通过库仑法水分测试仪标定不同水分含量（0.3‰ ~ 0.7‰）的磷酸铁锂正极片，将其制备成软包型锂离子电池，对其电化学循环性能、倍率性能、交流阻抗进行了测试. 结果表明，不同水分含量极片制备的电池循环性能及倍率性能与电极水分含量有密切关系，水分含量在0.4‰ ~ 0.5‰之间时循环性能最优，水分含量超过0.6‰时电化学性能衰减严重，电池的内阻和电化学反应阻抗明显增加. 将循环200周后的软包电池进行拆解，分别使用激光粒度仪、XRD、SEM对循环后磷酸铁锂正极片进行微观形貌分析，发现水分含量超过0.6‰时极片表面发生颗粒破裂现象. XRD晶相分析表明，随着水分含量的升高，衍射峰晶面的位置有所偏移，但主要衍射峰的位置基本相同，晶型并未发生改变.

关键词: 水分, 磷酸亚铁锂, 软包电池, 循环性能

Abstract:

Through different dry conditions and measuring by moisture test instrument, cathode pole pieces with different water contents of 0.3‰ ~ 0.7‰ were obtained to prepare lithium-ion batteries. Cycling performance and high rate performance at 1C ~ 5C discharge rates were tested. Moreover, ASR performances of LiFePO4 base lithium-ion batteries after 200 cycles with different water contents were investigated by EIS. The results showed that the cycle performance and rate performance were closely related to the water content of the electrode. When the water content went up to 0.6‰ the cycle stability and rate performance fell. Meanwhile, the internal resistance and the electrochemical reaction impedance increased after 200 cycles. The cells after running 200 cycles were dismantled to obtain the powder material which was studied by laser particle size analyzer, XRD and SEM to research the microstructure. The results revealed that when the water content exceeded 0.6‰ the obvious particle fracture phenomenon appeared. The XRD data indicated that the position of the main diffraction peak kept nearly the same and the crystal phase of the cathode material remained unchanged.

Key words: water content, lithium iron phosphate, full cell, cycle performance

中图分类号:

O646

牛俊婷, 孙琳, 康书文, 赵政威, 马紫峰. 电极水分对磷酸铁锂电池性能的影响[J]. 电化学（中英文）, 2015, 21(5): 465-470.

NIU Jun-ting, SUN Lin, KANG Shu-wen, ZHAO Zhen-wei, MA Zi-feng. Impact of Water Content on the Performance of LiFePO4 Based Lithium-Ion Battery[J]. Journal of Electrochemistry, 2015, 21(5): 465-470.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.150749

https://electrochem.xmu.edu.cn/CN/Y2015/V21/I5/465

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电极水分对磷酸铁锂电池性能的影响

Impact of Water Content on the Performance of LiFePO4 Based Lithium-Ion Battery

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