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Oxygen Release Degradation in Li-Ion Battery Cathode Materials: Mechanisms and Mitigating Approaches

机译：锂离子电池正极材料中的氧气释放降解：机理和缓解方法

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摘要

Widespread application of Li-ion batteries (LIBs) in large-scale transportation and grid storage systems requires highly stable and safe performance of the batteries in prolonged and diverse service conditions. Oxygen release from oxygen-containing positive electrode materials is one of the major structural degradations resulting in rapid capacity/voltage fading of the battery and triggering the parasitic thermal runaway events. Herein, the authors summarize the recent progress in understanding the mechanisms of the oxygen release phenomena and correlative structural degradations observed in four major groups of cathode materials: layered, spinel, olivine, and Li-rich cathodes. In addition, the engineering and materials design approaches that improve the structural integrity of the cathode materials and minimize the detrimental O-2 evolution reaction are summarized. The authors believe that this review can guide researchers on developing mitigation strategies for the design of next-generation oxygen-containing cathode materials where the oxygen release is no longer a major degradation issue.
机译：锂离子电池（LIB）在大规模运输和电网存储系统中的广泛应用要求电池在长期和多样化的使用条件下具有高度稳定和安全的性能。从含氧正电极材料释放的氧气是主要的结构退化之一，导致电池的快速容量/电压衰减并触发了寄生热失控事件。本文中，作者总结了了解氧释放现象机理和在四类主要阴极材料中观察到的相关结构退化的最新进展：四类阴极材料：层状，尖晶石，橄榄石和富锂阴极。另外，总结了改善阴极材料的结构完整性并使有害的O-2析出反应最小化的工程和材料设计方法。作者认为，该综述可以指导研究人员开发缓解策略，以设计下一代含氧阴极材料，其中氧的释放不再是主要的降解问题。

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