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Inhibiting Voltage Decay in Li-Rich Layered oxide Cathode: From o3-Type to o2-Type Structural Design

NANo-MICRo LETTERS 2024年第1期16卷 1-22页

作者： Zhang, Guohua Wen, Xiaohui Gao, Yuheng Zhang, Renyuan Huang, Yunhui Tongji Univ Inst New Energy Vehicles Sch Mat Sci & Engn Shanghai Key Lab R&D & Applicat Met Funct Mat Shanghai 201804 Peoples R China Contemporary Amperex Technol Co Ltd Ningde 352100 Peoples R China Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Hubei Peoples R China

This review systematically compares the different effects of o2-type and o3-type structures on voltage decay for Li-rich layered oxide (LRLo) *** development of o2-type materials and the corresponding mechanisms for addressing voltage decay are comprehensively *** perspectives and challenges for designing high-performance o2-type LRLo cathodes without voltage decay are proposed. Li-rich layered oxide (LRLo) cathodes have been regarded as promising candidates for next-generation Li-ion batteries due to their exceptionally high energy density, which combines cationic and anionic redox activities. However, continuous voltage decay during cycling remains the primary obstacle for practical applications, which has yet to be fundamentally addressed. It is widely acknowledged that voltage decay originates from the irreversible migration of transition metal ions, which usually further exacerbates structural evolution and aggravates the irreversible oxygen redox reactions. Recently, constructing o2-type structure has been considered one of the most promising approaches for inhibiting voltage decay. In this review, the relationship between voltage decay and structural evolution is systematically elucidated. Strategies to suppress voltage decay are systematically summarized. Additionally, the design of o2-type structure and the corresponding mechanism of suppressing voltage decay are comprehensively discussed. Unfortunately, the reported o2-type LRLo cathodes still exhibit partially disordered structure with extended cycles. Herein, the factors that may cause the irreversible transition metal migrations in o2-type LRLo materials are also explored, while the perspectives and challenges for designing high-performance o2-type LRLo cathodes without voltage decay are proposed.

关键词： Lithium-ion batteries Li-rich layered oxide Voltage decay Migration of transition metal ions o2-type structural design RECHARGEABLE LITHIUM BATTERIES ANIoNIC REDoX CHEMISTRY IoN-EXCHANGE INTERCALATIoN CoMPoUNDS ELECTRoNIC-structure o2 structure CAPACITY oRIGIN CHALLENGES MECHANISM

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