层状富锂锰基镍钴锰正极材料制备工艺改性的研究进展

Research progress of preparation improvement on Li-rich Mn-based NCM layered anode material

层状富锂锰基镍钴锰(Ni-Co-Mn)(NCM)正极材料成本低,比容量高,安全性好,是极具商业前景的三元正极材料,但存在首次不可逆容量大、高电压、高倍率和高温条件下循环性能差等缺陷。为有效改善富锂锰基NCM材料的首次充放电容量、倍率特性和循环性能等电化学性能,研究者们通过表面包覆、元素掺杂和优化制备工艺等手段进行改性。从改进材料制备工艺环节角度,评述了原材料的恰当选择、材料形貌的特殊结构、与导电剂材料复合及与其他正极材料混合4方面的研究进展,并展望了今后的研究方向。

Li-rich Mn-based layered Ni-Co-Mn anode material is one of the promising candidates of the commercial anode materials which will well satisfy the market's requirements for the low cost,high specific capacity and the good safety.However,there are some defects such as the large initial irreversible capacity and poor cycle ability under the high voltage,high rates and high temperature.Usually,the electrochemical performances have been greatly improved by means of coating,doping and optimizations of preparations.The preparations about the best choice of raw materials,the special structure,the composite with the conductive agent and the blend with other anode materials,were discussed and analyzed.And then,the developmental direction in the future was proposed.