新离子型添加剂对高镍锂离子电池性能影响研究  

A new ion additive:effects of high nickel lithium ionbattery performance

作　　者：汪红梅 邵先俊 张正华 马国强 WANG Hongmei;SHAO Xianjun;ZHANG Zhenghua;MA Guoqiang(Hunan Provincial Key Laboratory ofPower and Traffic Materials Protection, School ofChemical and Food Engineering, Changsha University of Science and Technology,Changsha 410114, China;Lithium Ion Battery Materials Key Laboratory, Zhejiang Research Institute of Chemical Industry,Hangzhou 310023, China)

机构地区：[1]长沙理工大学化学与食品工程学院,电力与交通材料保护湖南省重点实验室长沙410114 [2]浙江省化工研究院锂离子电池材料重点实验室,杭州310023

出　　处：《功能材料》2020年第4期4119-4123,共5页Journal of Functional Materials

基　　金：湖南省教育厅科学研究资助项目(17C0035);长沙理工大学电力与交通材料保护湖南省重点实验室开放基金资助项目(2015C107)。

摘　　要：研究了一种新离子型负极成膜添加剂2D对NMC811/石墨电池性能的影响,并与当前最常用商业化负极成膜添加剂VC进行对比试验。微分容量dQ/dV显示2D先于EC和VC在2.1 V左右还原,在石墨负极形成较稳定的SEI膜,交流阻抗结果表明含2D成膜阻抗明显低于VC;含2D、VC、2D和VC复合电解液的NMC811/石墨电池的倍率循环、高温存储和高温循环等测试结果表明,含2D电解液电池的石墨负极钝化膜更加稳定,有效提升锂离子电池的循环、存储和倍率性能,60℃存储含2D电池的电压和电阻变化较小,高温循环200周后,不含2D添加剂电池容量损失达15%,含2D电池容量保持率在92%以上。In this paper,a new type of negative film forming additive 2D was studied.The effect of 2D on the performance of NMC811/graphite battery was investigated.The comparison was done with the most commonly used commercial negative film forming additive VC.The differential capacity DQ/DV shows that 2D was reduced at about 2.1 V before EC and VC,and a stable SEI film was formed on the graphite negative electrode.Electrochemical impedance spectroscopy(EIS)test shows that the film formation impedance with 2D was significantly lower than that with VC.The test results of the ratio cycle,high temperature storage and high temperature cycle of the NMC811/graphite containing 2D,VC or 2D/VC show that the passivation film of graphite anode with 2D electrolyte battery was more stable,which effectively improved the performance of cycle,storage and magnification of lithium-ion batteries.The voltage and resistance of the battery with 2D electrolyte at 60℃had little change.After 200 weeks of extreme temperature cycle,the capacity loss of the battery without 2D additives reached 15%,and the capacity retention rate of the 2D battery was above 92%.

关 键 词：电解液 二氟草酸硼酸1 -(2-甲基磺酰)乙基-1 -甲基吡咯 碳酸亚乙烯酯 高镍锂离子电池 

分 类 号：TQ152[化学工程—电化学工业]