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

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.