钠离子电池层状过渡金属氧化物中阴离子氧的氧化还原反应活性调控

Modulating anionic redox reaction in layered transition metal oxides for sodium-ion batteries

由于资源丰富、价格低廉等特点,钠离子电池逐渐成为储能领域的研究热点。然而,钠离子电池正极材料较低的比容量是限制钠离子电池发展的关键因素之一。近年的相关研究发现,基于过渡金属阳离子与晶格氧阴离子双重氧化还原反应的层状过渡金属氧化物具有高的比容量,是下一代高比能量钠离子电池的首选正极材料。因此,深入了解阴离子氧的氧化还原反应的结构基础及演化机制,对探索高容量电池正极材料有重要意义。本文讨论了钠离子电池层状过渡金属氧化物中阴离子氧的氧化还原反应活化原理、以及结构调控对激发晶格氧活性的影响,并展望了其未来的发展趋势和前景,以期为今后该类型正极材料的研究提供参考。

Sodium-ion batteries(SIBs)are attractive for large-scale energy storage due to the abundance and low cost of sodium resources.However,cathode materials with single transition metal redox have limited capacity,hindering their further application.Recently,layered transition metal oxides have shown high specific capacity owning to the redox of transition metals and oxygen and have emerged as a new path to optimize the electrochemical performance of cathodes.Therefore,it is important to investigate the special structure and evolution mechanism in anionic redox reaction.In this study,the formation mechanism and structural regulation in anionic redox reaction are presented.This review is expected to offer a reference for designing high-performance cathode materials in SIBs.