不同掺杂元素对无钴高镍正极材料的影响  

Effect of Different Doping Element on Cobalt-Free High Nickel Cathode Materials

作　　者：李宝强 张飞龙[1] 周心安 李世友[1] Li Baoqiang;Zhang Feilong;Zhou Xinan;Li Shiyou(College of Petrochemical Technology,Lanzhou University of Technology,Lanzhou,730050)

机构地区：[1]兰州理工大学石油化工学院,兰州730050

出　　处：《化学通报》2023年第7期792-797,共6页Chemistry

基　　金：甘肃省产业支撑计划项目(2021CYZC-18);甘肃省重点研发项目(21YF5GA079)资助。

摘　　要：随着动力电动汽车的需求不断增加,发展低成本、高能量密度的锂离子电池正极材料成为关键。无钴高镍正极材料因其能量密度高、倍率性能好而受到了极大的关注。对于无钴高镍正极材料在循环过程中热稳定性差、容量衰减等问题,研究者们虽通过不同的掺杂元素改善了材料的电化学性能,但对不同掺杂元素的作用机理研究尚浅。本文综述了近年来无钴高镍正极材料掺杂改性方面的研究进展,重点总结了不同掺杂元素对改善材料电化学性能的作用机理。综合分析表明,向无钴高镍正极材料引入掺杂元素,尽管掺杂元素在材料中的主要作用机理不尽相同,但均都提高材料电化学性能,从而改善了无钴高镍材料固有的问题。最后,对无钴高镍正极材料改善策略的发展方向进行了展望,提出了多重改善策略协同应用的可行性方案。With the increasing demand for electric vehicles,the development of low-cost,high energy density lithium-ion battery cathode materials become the key point.Cobalt-free high nickel cathode materials have attracted great attention due to their high energy density and good rate performance.For the problems of poor thermal stability and capacity decay of cobalt-free high nickel cathode materials during cycling,researchers have improved the electrochemical performance of the materials by different doping elements,but the mechanism of action of different doping elements is not yet in-depth.In this paper,the research progress in doping modification of cobalt-free high nickel cathode materials in recent years is reviewed,and the mechanism of different doping elements to improve the electrochemical performance of materials is summarized.The comprehensive analysis shows that the introduction of doping elements into cobalt-free high nickel cathode materials improves the electrochemical performance of the materials,so that the inherent problems of cobalt-free high nickel materials can be improved,although the main mechanism of doping elements in the materials is not the same.Finally,the development direction of the improvement strategy of cobalt-free high nickel cathode materials is prospected,and a feasible scheme for the synergistic application of multiple improvement strategies is proposed.

关 键 词：锂离子电池 正极材料 无钴高镍 掺杂改性 作用机理 

分 类 号：TM912[电气工程—电力电子与电力传动]