Synthesis and Electrochemical Behavior of Na+ and Zr4+ Doped LiMnPO4/C as Potential Cathode Material for Li-ion Batteries

Abstract

By using a simple sol–gel method, several compounds, including LiMnPO4/C, Li0.9Na0.1MnPO4/C, and Li0.9Na0.1Mn0.98Zr0.02PO4/C, were successfully synthesised. We studied the effects of partial substitution of Li+ and Mn2+ with Na+ and Zr4+ doped in LiMnPO4/C and the electrochemical energy storage behavior of the final product. At 0.05 C, discharge specific capacity of Li0.9Na0.1Mn0.98Zr0.02PO4/C can be 159.4 mAh/g, which was much better than unmodified LiMnPO4/C (121.9 mAh/g). Capacity retention rate was 98% after 50 cycles. Appropriate concentrations of Na+ and Zr4+ doping at different cation positions can effectively improve LiMnPO4/C electrochemical behavior.