Enhanced structural stability and durability in lithium-rich manganese-based oxide via surface double-coupling engineering  

作　　者：Jiayu Zhao Yuefeng Su Jinyang Dong Xi Wang Yun Lu Ning Li Qing Huang Jianan Hao Yujia Wu Bin Zhang Qiongqiong Qi Feng Wu Lai Chen 

机构地区：[1]School of Materials Science and Engineering,Beijing Key Laboratory of Environmental Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401120,China [3]Yibin Libode New Materials Co.,Ltd.,Yibin 64400,Sichuan,China [4]Initial Energy Science&Technology(Xiamen)Co.,Ltd,Xiamen 361000,Fujian,China

出　　处：《Journal of Energy Chemistry》2024年第11期274-283,共10页能源化学（英文版）

基　　金：National Natural Science Foundation of China (22179008, 21875022);Yibin ‘Jie Bang Gua Shuai’ (2022JB004);support from the Beijing Nova Program (20230484241);support from the Postdoctoral Fellowship Program of CPSF (GZB20230931);Special Support of the Chongqing Postdoctoral Research Project (2023CQBSHTB2041);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 Li_(3)PO_(4) coating 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 Li_(3)PO_(4) to 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.

关 键 词：Lithium-ion battery Layered lithium-rich cathode Surface double-coupling engineering Lattice strain Oxygen release 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ137.12[化学工程—无机化工]