Enhanced structural stability and durability in lithium-rich manganese-based oxide via surface double-coupling engineering
作者机构：School of Materials Science and Engineering Beijing Key Laboratory of Environmental Science and Engineering Beijing Institute of Technology Chongqing Innovation Center Beijing Institute of Technology Yibin Libode New Materials Co. Ltd. Initial Energy Science & Technology (Xiamen) Co. Ltd
出 版 物：《Journal of Energy Chemistry》 (能源化学(英文版))
年 卷 期：2024年第11期
页 面：274-283页
核心收录：
学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术]
基 金：supported by the National Natural Science Foundation of China (22179008, 21875022) the Yibin ‘Jie Bang Gua Shuai’ (2022JB004) the support from the Beijing Nova Program (20230484241) the support from the Postdoctoral Fellowship Program of CPSF (GZB20230931) the Special Support of the Chongqing Postdoctoral Research Project (2023CQBSHTB2041) supported by Initial Energy Science & Technology Co., Ltd (IEST)
摘 要：Lithium-rich manganese-based oxides（LRMOs） exhibit high theoretical energy densities, making them a prominent class of cathode materials for lithium-ion batteries. However, the performance of these layered cathodes often declines because of capacity fading during cycling. This decline is primarily attributed to anisotropic lattice strain and oxygen release from cathode surfaces. Given notable structural transformations, complex redox reactions, and detrimental interface side reactions in LRMOs, the development of a single modification approach that addresses bulk and surface issues is challenging. Therefore,this study introduces a surface double-coupling engineering strategy that mitigates bulk strain and reduces surface side reactions. The internal spinel-like phase coating layer, featuring threedimensional（3D） lithium-ion diffusion channels, effectively blocks oxygen release from the cathode surface and mitigates lattice strain. In addition, the external Li3PO4coating layer, noted for its superior corrosion resistance, enhances the interfacial lithium transport and inhibits the dissolution of surface transition metals. Notably, the spinel phase, as excellent interlayer, securely anchors Li3PO4to the bulk lattice and suppresses oxygen release from lattices. Consequently, these modifications considerably boost structural stability and durability, achieving an impressive capacity retention of 83.4% and a minimal voltage decay of 1.49 m V per cycle after 150 cycles at 1 C. These findings provide crucial mechanistic insights into the role of surface modifications and guide the development of high-capacity cathodes with enhanced cyclability.
同方期刊数据库