储能科学与技术 ›› 2019, Vol. 8 ›› Issue (4): 725-731.doi: 10.12028/j.issn.2095-4239.2019.0043

• 研究开发 • 上一篇    下一篇

陶瓷隔膜在镍钴锰酸锂/石墨锂离子电池中性能

吴明霞1,2, 杨重阳1, 章庆林1, 陈思1, 安仲勋1,3, 周义荣1   

  1. 1 上海奥威科技开发有限公司国家车用超级电容器系统工程技术研究中心, 上海 201203;
    2 上海大学理学院, 上海 200444;
    3 上海大学材料科学与工程学院, 上海 200444
  • 收稿日期:2019-03-27 修回日期:2019-05-10 出版日期:2019-07-01 发布日期:2019-05-13
  • 通讯作者: 章庆林,工程师,研究方向为高功率化学电源和新型储能器件的研究开发,E-mail:qingling.zhang@aowei.com。
  • 作者简介:吴明霞(1982-),女,工程师,研究方向为能量型超级电容器和快充锂离子电池等储能器件,E-mail:wu_mx@aowei.com
  • 基金资助:
    上海市科委兆瓦级太阳能超级电容储能与调适“信息化”、超级电容车接驳与应急“零排放”示范项目(17DZ1201403)。

Performance of ceramic composite separators in lithium nickel cobalt manganese oxide/graphite lithium-ion batteries

WU Mingxia1,2, YANG Chongyang1, ZHANG Qinglin1, CHEN Si1, AN Zhongxun1,3, ZHOU Yirong1   

  1. 1 National Engineering Research Center for Supercapacitor for Vechicles, Shanghai AOWEI Technology Development Co. Ltd., Shanghai 201203, China;
    2 College of Science, Shanghai University, Shanghai 200444, China;
    3 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
  • Received:2019-03-27 Revised:2019-05-10 Online:2019-07-01 Published:2019-05-13

摘要: 陶瓷隔膜广泛应用在动力锂离子电池中,直接影响到电池的电性能。选取了6种商品化的聚对苯二甲酸乙二酯(PET)/陶瓷复合膜和聚烯烃/陶瓷复合膜,研究了其表面形貌、接触角、透气度和吸液率。并选用这6种隔膜制作了容量为2 A·h的镍钴锰酸锂/石墨软包锂离子电池,考察电池的内阻、自放电、容量、阻抗、倍率性能、循环寿命和高温浮充。结果表明,使用涂覆的陶瓷颗粒直径较小且均匀(0.2~0.5 μm),高吸液率(2.0 mg·cm-2),低透气度[72 s·(100 mL)-1]和较小内阻(4.65 mΩ)的2号PET/陶瓷复合膜的锂离子电池综合性能最好,10C的高倍率下容量高达1 C的94.9%,5C的大倍率循环500次后容量保持率高达102%,65℃高温浮充1000 h后容量保持在初始的90.4%。

关键词: 陶瓷隔膜, 锂离子电池, 高温浮充, 倍率性能, 循环性能

Abstract: Ceramic composite separators are used widely in the feld of power lithium-ion battery and have a direct effect on electrical performance. Six kinds of commercialized polyethylene terephthalate (PET)/ceramic and polyolefin/ceramic composite separator are selected and their corresponding morphology, contact angle, air permeability and electrolyte uptake are investigated. Lithium nickel cobalt manganese oxide/graphite pouch cell of 2 A·h were fabricated with these ceramic composite separators. And the resistance, capacity, self-discharge, AC impedance, rate capability, cycle life and high-temperature float charge performance are characterized. Due to the small and uniform size (0.2~0.5 μm) of coated ceramic particles, high electrolyte uptake (2.0 mg·cm-2), low air permeability[72 s·(100 mL)-1] and resistance (4.65 mΩ) for 2# PET/ceramic separator, the prepared lithiumion battery exhibits best comprehensive performance with excellent rate capability of 94.9% capacity retention from 1C to 10C, outstanding cycle life of 102% capacity retention after 500 cycles at 5C and high capacity retention of 90.4% for the floating charge at 65℃ after 1000 h.

Key words: ceramic composite separator, lithium-ion battery, high-temperature float charge, rate capability, cycle performance

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