Li0.98Ni0.7Ti0.3O1.92 cathode materials fabricated by thermal synthesis of Ni/Li/TiNi film

Abstract

Li0.98Ni0.7Ti0.3O1.92 (LNTO) cathode material for Li ion batteries was thermally synthesized using Ni/Li/TiNi film and Li/TiNi film. Structural and electrochemical properties of the synthesized electrodes were investigated by means of x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and galvanostatic charge-discharge half-cell test. A large amount of LNTO was synthesized in a Ni/Li/TiNi system compared to a Li/TiNi system, and the Ni film in the Ni/Li/TiNi system restrained Li leakage during thermal synthesis at high temperature. The surface of the annealed Ni/Li/TiNi film consisted of a peel-off layer part (Li2O2) and an exposed surface part (LNTO). A cell with LNTO electrode synthesized in the Ni/Li/TiNi system showed 103 mAh cm(-2) initial discharge capacity and 83% of capacity retention after 10 cycles.