高镍三元正极材料镍钴铝的掺杂改性研究进展

高镍三元正极材料镍钴铝（NCA）因具有较高的能量密度及工作电压、成本低、环境友好等优点极有可能成为下一代广泛应用的锂离子电池正极材料之一。然而镍含量的提高导致材料结构不稳定、循环性能和倍率性能降低，限制了其进一步发展。主要从锂位、过渡金属位、氧位掺杂及复合共掺杂4个方面综述了不同位置离子掺杂的改性机理。大量研究结果表明，通过复合共掺杂方式进行改性，能够结合单离子掺杂的优点有效提升镍钴铝正极材料的电化学性能。

Research progress on doping modification of high nickel ternary nickel-cobalt-aluminum cathode material

Due to the high energy density，high working voltage，low cost and environmental friendliness，high nickel ternary nickel-cobalt-aluminum（NCA） cathode material is likely to become one of the next generation widely used cathode materials for lithium ion batteries.However，increasing of nickel content，resulting in more unstable material structure，reduced cycle performance，and rate capability，limits its further development.The modification mechanism of ion doping at different positions from four aspects: lithium site，transition metal site，oxygen site doping and composite co-doping were summarized.A large number of research results showed that modification by composite co-doping could effectively improve the electrochemical performance of nickel-cobalt-aluminum cathode materials by combining the advantages of single ion doping.