Origin and characterization of the oxygen loss phenomenon in the layered oxide cathodes of Li-ion batteries

Li-ion batteries have been widely applied in the field of energy storage due to their high energy density and environment friendliness. Owing to their high capacity of ∼200 mA h g −1 and high cutoff voltage of ∼4.6 V vs. Li + /Li, layered lithium transition metal oxides (LLMOs) stand out among the n...

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Bibliographic Details
Published in:Materials horizons 2023-10, Vol.1 (11), p.4686-479
Main Authors: Feng, Junrun, Chen, Zhuo, Zhou, Weihua, Hao, Zhangxiang
Format: Article
Language:English
Subjects:
Cathodes
Cycles
Electrochemical analysis
Electrode materials
Electrolytes
Energy storage
Lithium-ion batteries
Oxygen
Rechargeable batteries
Thermal instability
Transition metal oxides
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Summary:Li-ion batteries have been widely applied in the field of energy storage due to their high energy density and environment friendliness. Owing to their high capacity of ∼200 mA h g −1 and high cutoff voltage of ∼4.6 V vs. Li + /Li, layered lithium transition metal oxides (LLMOs) stand out among the numerous cathode materials. However, the oxygen loss of LLMO cathodes during cycling hampers the further development LLMO cathode-based Li-ion batteries by inducing a dramatic decay of electrochemical performance and safety issues. In this regard, the oxygen loss phenomenon of LLMO cathodes has attracted attention, and extensive efforts have been devoted to investigating the origins of oxygen loss in LLMO cathodes by various characterization methods. In this review, a comprehensive overview of the main causes of oxygen loss is presented, including the state of charge, side reactions with electrolytes, and the thermal instability of LLMO cathodes. The characterization methods used in the scope are introduced and summarized based on their functional principles. It is hoped that the review can inspire a deeper consideration of the utilization of characterization techniques in detecting the oxygen loss of LLMO cathodes, paving a new pathway for developing advanced LLMO cathodes with better cycling stability and practical capabilities. This review summarizes the current understanding of the origins of oxygen loss in LLMO cathodes and introduces advanced characterization techniques used to detect the phenomenon.
ISSN:2051-6347
2051-6355
DOI:10.1039/d3mh00780d