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2A·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(0.2~0.5μm),高吸液率(2.0mg·cm^-2),低透气度[72s·(100mL)^-1]和较小内阻(4.65mΩ)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1C的94.9%,5C的大倍率循环500次后容量保持率高达102%,65°C高温浮充1000h后容量保持在初始的90.4%。
Ceramic composite separators are used widely in the field 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.
作者
吴明霞
杨重阳
章庆林
陈思
安仲勋
周义荣
WU Mingxia;YANG Chongyang;ZHANG Qinglin;CHEN Si;AN Zhongxun;ZHOU Yirong(National Engineering Research Center for Supercapacitor for Vechicles, Shanghai AOWEI Technology Development Co. Ltd., Shanghai 201203, China;College of Science, Shanghai University, Shanghai 200444, China;School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China)
出处
《储能科学与技术》
CAS
CSCD
2019年第4期725-731,共7页
Energy Storage Science and Technology
基金
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)
关键词
陶瓷隔膜
锂离子电池
高温浮充
倍率性能
循环性能
ceramic composite separator
lithium-ion battery
high-temperature float charge
rate capability
cycle performance
