Chen Hexiang, Sun Chunwen
School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, P. R. China.
Chem Commun (Camb). 2023 Jul 20;59(59):9029-9055. doi: 10.1039/d3cc02195e.
The development of society challenges the limit of lithium-ion batteries (LIBs) in terms of energy density and safety. Lithium-rich manganese oxide (LRMO) is regarded as one of the most promising cathode materials owing to its advantages of high voltage and specific capacity (more than 250 mA h g) as well as low cost. However, the problems of fast voltage/capacity fading, poor rate performance and the low initial Coulombic efficiency severely hinder its practical application. In this paper, we review the latest research advances of LRMO cathode materials, including crystal structure, electrochemical reaction mechanism, existing problems and modification strategies. In this review, we pay more attention to recent progress in modification methods, including surface modification, doping, morphology and structure design, binder and electrolyte additives, and integration strategies. It not only includes widely studied strategies such as composition and process optimization, coating, defect engineering, and surface treatment, but also introduces many relatively novel modification methods, such as novel coatings, grain boundary coating, gradient design, single crystal, ion exchange method, solid-state batteries and entropy stabilization strategy. Finally, we summarize the existing problems in the development of LRMO and put forward some perspectives on the further research.
社会的发展在能量密度和安全性方面对锂离子电池（LIBs）的极限提出了挑战。富锂锰氧化物（LRMO）因其具有高电压、高比容量（超过250 mA h g）以及低成本等优点，被视为最具潜力的正极材料之一。然而，电压/容量快速衰减、倍率性能差以及初始库仑效率低等问题严重阻碍了其实际应用。本文综述了LRMO正极材料的最新研究进展，包括晶体结构、电化学反应机理、存在的问题及改性策略。在本综述中，我们更加关注改性方法的最新进展，包括表面改性、掺杂、形貌与结构设计、粘结剂和电解质添加剂以及集成策略。它不仅包括诸如成分和工艺优化、涂层、缺陷工程和表面处理等被广泛研究的策略，还介绍了许多相对新颖的改性方法，如新型涂层、晶界涂层、梯度设计、单晶、离子交换法、固态电池和熵稳定策略。最后，我们总结了LRMO发展中存在的问题，并对进一步的研究提出了一些展望。
