The modification of cathode material LiMn₂O₄ for lithium-ion batteries

Spinel LiMn₂O₄ is regarded as the most promising cathode material for lithium-ion batteries because of its low cost and environmental friendly nature over LiCoO₂. In this paper, the electrochemical performance of LiMn₂O₄ was improved by doping with chromium and coating with polymers. Its electrochemical characteristics were measured before and after the modifications. The results showed that both of coating and doping could suppress the capacity fading of LiMn₂O₄ and improve its electrochemical characteristics. Nevertheless, only one way cannot achieve the best effect until both are used. With the combination of these two modification approaches we can not only stop the capacity fade of LiMn₂O₄ at room temperature, but also stabilize its cycling performance at high temperature.