层状高镍正极材料单晶化研究
Single Crystallization of Layered Nickel-Rich Cathode Materials
郝璐琦 1朱新宇 1李永健 1黄擎 1李宁 1苏岳锋1
作者信息
- 1. 北京理工大学材料学院 北京 100081;北京理工大学重庆创新中心 重庆 401120
- 折叠
摘要
高镍锂镍锰钴氧化物(NMC)三元正极活性材料具有高比容量和高功率等优点,是具有前途的锂离子电池正极材料之一.然而目前大多数的高镍三元层状材料为多晶颗粒,其体积能量密度、循环稳定性等并不令人满意.因此,独立且分散良好的单晶高镍三元层状材料(SC-NMCs)可作为替代多晶高镍三元正极的最佳候选材料.本文首先系统地从前驱体制备、材料烧结和锂盐补充等角度综述了如何合成SC-NMCs及其与单晶材料性能的构效关系.第二,综合性地总结了 SC-NMCs相比多晶材料的性能优势,特别是颗粒间无裂纹的形貌表现出良好的循环性能.第三,针对SC-NMCs的劣势与挑战,全面地介绍了关于SC-NMCs的元素掺杂、表面改性、双重改性等改性策略.本综述对SC-NMCs的合成与改性提出了创新性的观点,对下一代锂离子电池单晶高镍三元正极材料的应用与发展提供了方向性指导.
Abstract
Nickel-rich-manganese-cobalt oxide(NMC)ternary cathode materials are considered to be one of the most promising cathode materials for lithium-ion batteries due to their high specific capacity and high power.However,most of the current nickel-rich ternary layered materials are polycrystalline particles,and their volumetric energy density and cyclic stability are not satisfactory.Therefore,independent and well-dispersed single-crystal nickel-rich ternary layered materials(SC-NMCs)can be used as the best candidates to replace polycrystalline nickel-rich ternary cathodes.In this paper,we systematically review how to synthesize SC-NMCs and their corresponding relationship with the properties of single-crystal from the perspectives of precursor preparation,material sintering and lithium salt supplementation.Secondly,the performance advantages of SC-NMCs compared with polycrystalline materials are comprehensively summarized,especially the morphology without cracks between particles,which shows good cycling performance.Thirdly,in view of the disadvantages and challenges of the current SC-NMCs,the modification strategies of SC-NMCs,such as element doping,surface modification and double modification,are comprehensively introduced.This review puts forward innovative views on the synthesis and modification of SC-NMCs and provides directional guidance for the application and development of single-crystal nickel-rich ternary layered cathode materials for next-generation lithium-ion batteries.
关键词
高镍正极材料/单晶/合成/改性策略Key words
nickel-rich cathode materials/single-crystal/synthesis/modification strategy引用本文复制引用
出版年
2024
NETL
NSTL
万方数据