Inhibiting Voltage Decay in Li-Rich Layered Oxide Cathode: From O3-Type to O2-Type Structural Design
作者机构：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
出 版 物：《NANO-MICRO LETTERS》 (纳微快报（英文版）)
年 卷 期：2024年第16卷第1期
页 面：1-22页
核心收录：
学科分类：07[理学] 070203[理学-原子与分子物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：National Natural Science Foundation of China [22279092 5202780089]
主 题：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
摘 要：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.
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