高电压正极材料LiMnPO4的研究进展

Research Progress on LiMnPO4 as High Voltage Cathode Materials for Lithium Ion Batteries

摘要:

高电压正极材料LiMnPO4具有无毒、电压高、比容量高、循环性能和安全性能好等优点成为锂离子电池正极材料的研究热点之一，但是较低的电子导电率、本征电导率及较差的倍率性能限制了该材料的实际应用。近几年来，通过增强颗粒间电子导电性、提高颗粒内部的本征电导率和减小颗粒尺寸等，显著提升了LiMnPO4材料的电化学性能。本文介绍了LiMnPO4材料的结构和特点以及近年来国内外的合成和改性方法，包括高温固相法、溶胶-凝胶法、水热法、喷雾干燥法、表面包覆、掺杂和制备纳米尺寸材料等。揭示了目前LiMnPO4的研究现状和存在问题，并对今后的发展前景以及研究的重要方向进行了评述

Abstract:

The high voltage cathode material, LiMnPO4, has gained a lot of attention, because of its properties of non-toxicity, high voltage, excellent cycle performance and security. But the shortages of this material limit its application, such as the bad electronic conductivity, intrinsic conductivity and rate capability. In recent years, the electrochemical performance of LiMnPO4 has been improved significantly by increasing the electronic conductivity between the particles, the intrinsic conductivity of particles and decreasing the size of particles. In this paper, we mainly introduced the structure and properties of LiMnPO4 and the methods of synthesizing and improving LiMnPO4 material, including high temperature solid-phase, sol-gel, hydrothermal method and spray drying, surface coating, doping and nano-structure synthesis. We also concluded the current situation and the problems of the research of LiMnPO4 material and gave some comments of the main research direction