陶瓷隔膜对于LiNi_(0.8)Co_(0.15)Al_(0.05)O_2动力锂离子电池性能的影响  

Influence of ceramic separator on the LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 high powerLi-ion battery performance

作　　者：高蕾[1] 程广玉[1] 顾洪汇[1] 王可[1] GAO Lei;CHENG Guangyu;GU Honghui;WANG Ke(State Key Laboratory of Space Power Technology,Shanghai Institute of Space Power Sources,Shanghai 200245,China)

机构地区：[1]空间电源技术国家重点实验室上海空间电源研究所,上海200245

出　　处：《储能科学与技术》2019年第2期297-303,共7页Energy Storage Science and Technology

摘　　要：本文以普通聚烯烃隔膜作为对比,研究了不同工艺的聚烯烃基膜制作的陶瓷隔膜对于Li Ni0.8Co0.15Al0.05O2动力锂离子电池性能的影响。表征了三种隔膜的本征性能,包括微孔形貌、透气度和离子电导率。干法基膜陶瓷隔膜、湿法基膜陶瓷隔膜和普通聚烯烃隔膜的透气度值分别为165 sec/100 m L、200 sec/100 m L和520 sec/100 m L;离子电导率分别为0.952 m S/cm^2、0.703 m S/cm^2和0.622mS/cm^2。分别采用三种隔膜制作了容量为2 A·h的软包装电池,评估了电池的倍率性能、循环寿命以及荷电保持能力。结果发现,与普通聚烯烃隔膜相比,陶瓷隔膜可以提高电池的功率性能,并且干法聚烯烃基膜制作的陶瓷隔膜,其倍率增效作用较湿法基膜的陶瓷隔膜明显,尤其当放电倍率达到电池的设计极限时,干法聚烯烃基膜制作的陶瓷隔膜对于电池倍率性能的增效作用更加显著。Influence of ceramic separators with different base film on the performance of LiNi0.8Co0.15Al0.05O2 high power battery is researched, with conventional polyolefin separator as control experiment. The intrinsic performance of these three kinds of separators including micro-morphology, gurley number, and ion conductivity are investigated. For dry process base film ceramic separator, wet process base film ceramic separator and polyolefin separator, the air permeability are 165sec/100cc, 200sec/100cc and 520sec/100cc, respectively. The ion conductivity are 0.952 mS/cm^2, 0.703 mS/cm^2, and 0.622 mS/cm^2. Pouch cells of 2 A·h were prepared with three kinds of separators. Rate performance, cycle and capacity retention were tested. The results exhibit that the ceramic separator can improve voltage plateau compared with polyolefin separator, and the role of dry process base film ceramic separator in improving cell power performance is more evident than the wet process base film ceramic separator, especially when the discharge rate is increased to a margin level of the cell design.

关 键 词：陶瓷隔膜 高功率 锂离子电池 透气度 

分 类 号：TM912.9[电气工程—电力电子与电力传动]