相比传统层状氧化物正极材料,阴离子氧化还原正极材料具有很高的充放电比容量,高比容量是氧阴离子参与氧化还原反应的结果,阴离子氧化还原型正极材料是近年来高容量正极材料的研究方向之一。归纳了电极材料氧化还原反应的基本过程,从分子轨道理论对阴离子氧化还原机制和构型不同的层状材料氧化还原过程进行了阐述。概括了不同改性手段(如阴离子掺杂或取代、调控阳离子比例、氧缺陷产生和表面包覆)对材料电化学性能的影响。对阴离子氧化还原反应今后的研究进行了展望。
Compared with traditional layered oxide cathode materials,anionic redox cathode materials have a high charge-discharge specific capacity.The high specific capacity is the result of oxyanions participating in the redox reaction.Anionic redox cathode materials are one of the research directions for high-capacity cathode materials in recent years.The basic process of the redox reaction of electrode materials was summarized.From the molecular orbital theory,the redox mechanism of anion and the redox process of layered materials with different configurations were described.The influence of different modification methods (such as anion doping or substitution,adjustment of cation ratio,oxygen defect generation and surface coating) on the electrochemical performance of materials was introduced.The future research of anion redox reaction was prospected.
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基金资助
国家自然科学基金(21865021);内蒙古科技计划关键技术攻关项目(2020GG0166)
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