摘要
采用LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2三元正极材料匹配钛酸锂(Li_4Ti_5O_(12))负极材料,制备8 Ah软包装锂离子电池,注液前分别烘烤24 h和36 h,电芯水分约为0.030%和0.015%,研究水分对电池高温性能的影响。与水分0.015%的电池相比,水分0.030%的电池首次库仑效率较低,极化明显。在55℃下高温搁置7 d后,电池容量保持率和恢复率结果显示:水分0.030%的电池为98.5%和99.4%,而水分0.015%的电池为99.5%和100.1%,均高于0.030%水分的电池;55℃下3 C循环(1.5~2.7 V)第2 000次时,0.030%和0.015%水分的电池容量保持率分别为87.8%和89.4%。较低的水分可提高电池在高温下的搁置和循环性能。
A 8 Ah soft pack Li-ion battery was prepared, using LiNi0. 5 Co0.2 Mn0. 3 O2 as ternary cathode material and lithium titanium oxide（ Li4Ti5 O12 ） as anode material. The influence of moisture （0. 030% and 0. 015% ） on the high temperature performance of the battery was investigated,when the battery was backed 24 h and 36 h respectively before injection. When the moisture was 0. 030% , the initial Coulombic efficiency of the battery was lower and the polarization was larger than the one with the moisture of 0. 015%. After keeping at 55 ℃ for 7 d,the capacity retention and recovery ratios of the battery with the moisture of 0. 030% were 98.5% and 99. 4% , respectively,while the one with the moisture of 0. 015% were 99.5% and 100. 1%. The capacity retention ratios of the batteries with the moistures of 0. 030% and 0. 015% after 2 000 cycles at 3 C were 87.8% and 89.4%, respectively. The lower moisture could enhance the storage and cycling performance of the battery at high temperature.
作者
杨尘
汪涛
王金龙
熊明松
YANG Chen, WANG Tao, WANG Jin-long, XIONG Ming-song(Hefei Guoxuan High- Tech Power Energy Co., Ltd., Hefei,Anhui 230011, China)
出处
《电池》
CAS
CSCD
北大核心
2018年第1期45-48,共4页
Battery Bimonthly
基金
国家科技部"863"计划课题(2015AA034601)
