LiBOB对Li1.15Ni0.68Mn1.32O4电极电化学行为的影响  

Influence of Li BOB on the Electrochemical Performance of Li_(1.15)Ni_(0.68)Mn_(1.32)O_4 Electrode

作　　者：姜雪[1] 史楠楠[1] 张莹[1] 程魁[1] 叶克[1] 王贵领[1] 曹殿学[1] 

机构地区：[1]超轻材料与表面技术教育部重点实验室、哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001

出　　处：《高等学校化学学报》2015年第4期739-744,共6页Chemical Journal of Chinese Universities

基　　金：黑龙江省重大科技招标项目(批准号:GA14A101);哈尔滨市应用技术研究与开发项目(批准号:2014DB4AG016)资助~~

摘　　要：采用恒电流充放电技术研究了锂离子电池电解液添加剂双草酸硼酸锂(Li BOB)对Li1.15Ni0.68Mn1.32O4电极电化学性能的影响,用X射线衍射(XRD)、衰减全反射傅里叶变换红外光谱(FTIR-ATR)、电感耦合等离子体发射光谱(ICP)、扫描电子显微镜(SEM)和电化学阻抗谱(EIS)分析了Li BOB对Li1.15Ni0.68Mn1.32O4电极性能的影响.结果显示,Li BOB作为电解液添加剂能显著改善Li1.15Ni0.68Mn1.32O4电极的循环性能,原因是Li BOB在充放电过程中会在Li1.15Ni0.68Mn1.32O4电极表面发生分解,分解产物在电极表面沉积形成固体电解质界面(SEI)膜,SEI膜能够有效抑制Li1.15Ni0.68Mn1.32O4电极材料中Mn的溶解,确保其晶体结构的稳定性,从而提高Li1.15Ni0.68Mn1.32O4电极的循环性能.The influence of electrolyte additive lithium bis（ oxalate） borate（ Li BOB） on the electrochemistry performance of Li1. 15Ni0. 68Mn1. 32O4 electrode was studied by means of galvanostatic charge-discharge. X-ray diffraction（ XRD）,Fourier transform infrared attenuated total reflectance（ FTIR-ATR） spectroscopy,inductively coupled plasma-atomic emission spectrometry（ ICP-AES）,scanning electron microscopy（ SEM） and electrochemical impedance spectroscopy（ EIS） were used to investigate the influence. The results show that the cyclic performance of Li1. 15Ni0. 68Mn1. 32O4 electrode is improved apparently by the addition of Li BOB,and the reason is that Li BOB may decompose during the charge-discharge process and the decomposition product further deposites on the surface of Li1. 15Ni0. 68Mn1. 32O4 electrode,forming solid electrolyte interface（ SEI） film,inhibiting the dissolution of Mn and keeping the crystal structure of Li1. 15Ni0. 68Mn1. 32O4 stable,therefore,the cyclic performance of Li1. 15Ni0. 68Mn1. 32O4 is improved.

关 键 词：双草酸硼酸锂 电解液添加剂 固体电解质界面膜 锰溶解 

分 类 号：O646[理学—物理化学]