高镍材料优化改性方法的研究进展

Research progress on optimization and modification of nickel-rich cathode materails

随着社会的快速发展,电子产品对化学电源的能量密度要求不断提高。高镍材料因其极高的能量密度而被广泛研究和应用。因为高镍材料的不稳定性和表面活性,所以需优化改性使其充分发挥高比能量的特性,构筑纳米包覆层和元素替代是优化高镍材料的主要方法。将系统回顾近几年较为出色的优化改性方案,并尝试从生产方法、原料成本和改性结果等角度分析,评估将这些方案产业化的可行性。文章认为元素替代和包覆相结合的双重优化方案能高效改良高镍材料的内、外部结构,提高其电化学性能,是未来材料改性的主要研究方向。

Lithium-ion batteries(LIBs)need higher energy density with the iteration of electronical products.Nickelrich cathode materials is widely researched and applied due to its extremely high theoretical energy density.However,the present problems and challenges to nickel-rich cathode materials are put forward,the issues of safety and capacity fade of nickel-rich cathode materials are urgently required to be resolve.In this article,the varieties of element substitution and construction of nano coating layer were reviewed,which are both principal methods to modify nickelrich cathode materials,and based on the production procedure,cost,effectiveness,the availability of industrialization were presented.The paper suggests that combination of coating and doping at the same time is the main optimization strategy of the nickel-rich cathode materials in future because the combination methods are able to improve the internal and external structure as well as electrochemical performance of nickel-rich cathode materials effectively.