三元镍钴锰正极材料的制备及改性

Preparation and Modification of Ni-Co-Mn Ternary Cathode Materials

三元镍钴锰正极材料是一类非常重要的正极材料,具有性能优于钴酸锂而成本远远低于钴酸锂、能量密度远远高于磷酸铁锂等重要优点,正在逐渐成为汽车动力电池的主流正极材料。但是,三元镍钴锰正极材料也存在循环稳定性不足、大电流密度放电性能不佳等问题。围绕解决这些问题并进一步提升三元镍钴锰正极材料的性能,近年来国内外在材料制备技术以及改性技术方面开展了大量的研究工作,取得了若干令人瞩目的研究成果。本文从材料制备方法、包覆修饰和掺杂改性三个方面,介绍了三元镍钴锰正极材料制备技术及改性技术的研究进展,在此基础上,对三元镍钴锰正极材料的未来发展方向作出展望。

Ternary nickel cobalt manganese cathode materials are one of the most important cathode materials of lithium ion batteries. Ni-Co-Mn ternary materials have much higher power density than LiFePO4 and lower cost than LiCoO2 , so it is becoming the dominant cathode material for power battery. However, there are still some shortcomings of Ni-Co-Mn ternary materials, such as poor stability and rate performance. In recent years, great efforts have been made to improve the materials through exploring new synthesis method and modifying the materials via doping and coating techniques, and some progress has been achieved. In this paper, the latest progress on the synthesis, doping and coating of Ni-Co-Mn ternary materials are introduced. Furthermore, a perspective for the development tendency of Ni-Co-Mn ternary materials is also made.