储能科学与技术 ›› 2019, Vol. 8 ›› Issue (1): 191-194.doi: 10.12028.j.issn.2095-4239.2018.0123

• 研究及进展 • 上一篇    下一篇

钛酸锂电芯正负极容量匹配设计及其对电芯性能影响

李荣辉1, 孔令丽1, 王纪威1, 李文轩1, 樊沁娜2   

  1. 1 天津力神电池股份有限公司, 天津 300384;
    2 石家庄铁道大学, 河北 石家庄 050043
  • 收稿日期:2018-07-20 修回日期:2018-08-10 出版日期:2019-01-01 发布日期:2018-08-28
  • 通讯作者: 李荣辉(1983-),男,高级工程师,主要从事锂离子电池快充电化学体系研究,E-mail:lrh031776@163.com。
  • 作者简介:李荣辉(1983-),男,高级工程师,主要从事锂离子电池快充电化学体系研究,E-mail:lrh031776@163.com。

The capacity matchup design and its effects on the performances of LTO lithium ion battery

LI Ronghui1, KONG Lingli1, WANG Jiwei1, LI Wenxuan1, FAN Qinna2   

  1. 1 Tianjin Lishen Battery Joint-Stock Co. Ltd., Tianjin 300384, China;
    2 Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China
  • Received:2018-07-20 Revised:2018-08-10 Online:2019-01-01 Published:2018-08-28

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摘要： 本研究以三元NCM为正极材料，钛酸锂LTO为负极材料制作了软包装锂离子电池，并通过固定正极容量，变化负极容量的方式设计4种不同的N/P比电池，并对不同N/P比钛酸锂电池的电池容量、高温存储和循环性能进行了研究，结果显示N/P比设计对正负极材料克容量发挥，电池容量发挥，高温存储和循环性能均具有较大影响。提高N/P比可以提高电池初始放电容量，提高正极克容量发挥。但提高N/P比会使得正极电极电位提高，特别是在接近满充电状态时，电解液易在正极侧发生氧化反应。而低的N/P比可以保证正极具有低的电极电位，从而降低在进行高温存储和循环测试时电池内部的副反应，有利于改善电池高温存储性能和循环性能。对能量密度要求不高时，为了保证长寿命循环和良好的高温性能，可以适当降低N/P比到0.85~0.9之间。

关键词: 软包装钛酸锂电芯, N/P比设计, 容量发挥, 高温存储, 循环性能

Abstract: In this study, a pouch lithium ion battery was fabricated by using NCM as cathode material and LTO as anode material. Four different N/P ratios were designed by changing the capacity of LTO anode. The battery capacity, high temperature storage and cycling performance were studied, and the results show that increasing the N/P ratio can improve the initial discharge capacity of the battery. However, increasing the N/P ratio will increase the potential of the positive electrode, and the electrolyte will be easily oxidized on the positive electrode side, especially near the fully charged state. The low N/P ratio may ensure that the positive electrode has a lower electrode potential, which reduces the side effects of the LTO battery and improves the high temperature storage and cycling performances.

Key words: pouch LTO lithium ion battery, N/P ratio, battery capacity, high temperature storage and cycling performance

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