氧化还原
阴极
电化学
锂(药物)
可持续能源
纳米技术
共价键
氧气
化学
化学物理
过渡金属
催化作用
材料科学
无机化学
电极
物理化学
有机化学
医学
工程类
可再生能源
电气工程
内分泌学
作者
Byung‐Hoon Kim,Jun‐Hyuk Song,Donggun Eum,Seungju Yu,Kyungbae Oh,Myeong Hwan Lee,Ho‐Young Jang,Kisuk Kang
标识
DOI:10.1038/s41893-022-00890-z
摘要
Lithium-rich layered oxides have emerged as a new model for designing the next generation of cathode materials for batteries to assist the transition to a greener energy system. The unique oxygen redox mechanism of such cathodes enables extra energy storage capacity beyond the contribution from merely transition metal ions; however, their practical application is hindered by the destabilizing structural changes during operation. Here we present a theoretical framework for the triptych of structural disorder, bond covalency and oxygen redox chemistry that applies to a wide range of layered oxides. It is revealed that structural disorder stabilizes the oxygen redox by promoting the formation of oxygen covalent bonds in favour of electrochemical reversibility. Oxygen dimers are found to move freely within the lattice structure and serve as a key catalyst of the poor structural resilience. Such fundamental understanding provides fresh insights that could inform strategies to mitigate the limitations of anionic redox cathodes, moving us a step closer to tapping into their enormous potential.
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