Synthesis And Electrochemical Performance Of ZnMn₂O₄ Anode Material For Lithium-ion Batteries

Currently, graphite as a dominant negative material on the market, will continue to stand for a long time, but its theoretical capacity lower greatly restricted the development of the graphite material, it can be said graphite material development has come to a bottleneck stage. Therefore, the development of high capacity anode material is a priority, wherein the transition metal oxide spinel structure ZnMn₂O₄ because of its high specific capacity, the potential of the potential low, low price, safe pollution, has attracted researchers’ attention.In this paper, zinc nitrate and manganese acetate was synthesized particles Zn Mn₂O₄ pure phase spinel structure by sol-gel method, ZnMn₂O₄ crystallization at 800 ℃ for 12 h and calcined well prepared, uniform particles. Experimental results show that the calcination temperature and time on the structure and morphology of materials have played a key role. Examine its electrochemical properties, the material which has a high capacity lithium deintercalation initial discharge capacity of 1310 mAh/g, Coulomb efficiency of 88.3%, after 20 cycles, the capacity retention rate was 76.2%.Material coprecipitation method using zinc acetate and manganese nitrate were prepared spherical ZnMn₂O₄ pure spinel structure, as determined800 ℃ more appropriate calcination temperature, the calcination time is about optimum 12 h, prepared under conditions of initial discharge capacity for 1321 mAh/g, coulombic efficiency was 74.6%, after 20 cycles Capacity retention ratio 71.1%.A fiber as a template using zinc nitrate and manganese acetate,at room temperature and evaporated self-assembly of particles synthesized ZnMn₂O₄ pure phase spinel structure, dandelion template synthesis ZnMn₂O₄ good crystallinity and uniform particles. Examine its electrochemical properties,synthetic materials first discharge capacity of 1187 mAh/g, Coulomb efficiency of 80.9%. After 20 cycles the capacity retention rate was 84.3percent.Comparison of three methods to fiber as a template for the synthesis of evaporative self-assembly method ZnMn₂O₄ material has the bestappearance,and the best electrochemical performance.