Synthesis and evaluation of electrochemical properties of layered-spinel Li3MnTiO4+ cathode material applied for Li-ion batteries

Abstract

Herein, a layered-spinel structure of Li3MnTiO4+z (0.8Li2Mn0.5Ti0.5O3•0.2LiMnTiO4) as a working electrode (WE) for Li-ion batteries was synthesized successfully by a solid-state reaction. The cathode delivers a capacity of 80 mAh g−1 for the first discharge. During a working cycle of the battery, the layered-phase material was activated, which contributes to the voltage increase in the 3 V region. The layered phase activation also contributes to the rise in cathode capacity and after 24 cycles, it could reach a capacity of 190 mAh g−1. Moreover, numerous Ti atoms substituted for Mn, and the composite structure facilitated the fast Li+ diffusion, leading to the Li+ diffusion coefficient number in the cathode showing a high value of 3.28 × 10−10 cm2 s−1.