The effect of aluminum on the structure and electrochemical performance ofLi Ni0.5Mn0.3Co0.2 O2 positive electrode materials for Li-ion batteries

Single phase LiNi0.5Mn0.3Co0.2-xAlxO2 (0≤x≤0.2) compounds were prepared via acid citric-nitrate combustion method and investigated the effect of substitution of aluminum for cobalt on the structural and electrochemical properties. The structural evolution was assessed by thermo gravimetric analysis/simultaneous differential thermal analysis, X-ray diffraction and scanning electron microscopy experiments. The electrochemical performance was evaluated by analyzing the charge/discharge profiles, cycling stability and rate-capability performances. The cycling stability and rate-capability performance of aluminum bearing materials were superior to the parent material. Partial replacement of aluminum leads to structural changes that affect electrochemical performance. The improved electrochemical behavior is closely connected to the stabilization of the layered structure and the reduction of the cation mixing after metal substitution.

Keywords:

Aluminium , Cathode material , Li-ion batteries , electrochemical performance