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首页> 外文期刊>Advanced Materials >Ion-Migration Mechanism: An Overall Understanding of Anionic Redox Activity in Metal Oxide Cathodes of Li/Na-Ion Batteries
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Ion-Migration Mechanism: An Overall Understanding of Anionic Redox Activity in Metal Oxide Cathodes of Li/Na-Ion Batteries

机译：Ion-Migration Mechanism: An Overall Understanding of Anionic Redox Activity in Metal Oxide Cathodes of Li/Na-Ion Batteries

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摘要

The anionic redox reaction (ARR) has attracted extensive attention due to itspotential to enhance the reversible capacity of cathode materials in Li/Na-ionbatteries (LIBs/SIBs). However, the understanding of its activation mechanismis still limited by the insufficient mastering of the underlying thermodynamicsand kinetics. Herein, a series of Mg/Li/Zn-substituted Na_xMnO_2 andLi_xMnO_2 cathode materials are designed to investigate their ARR behaviors. Itis found that the ARR can be activated in only Li-substituted Li_xMnO_2 and notfor Mg- and Zn-substituted ones, while all Mg/Li/Zn-substituted Na_xMnO_2cathode materials exhibit ARR activities. Combining theoretical calculationswith experimental results, such a huge difference between Li and Na cathodesis closely related to the migration of substitution ions from the transitionmetal layer to the alkali metal layer in a kinetic aspect, which generatesunique Li(Na)–O–□TM and/or □Li/Na–O–□TM configurations and reducingreaction activation energy to trigger the ARR. Based on these findings, anion-migration mechanism is proposed to explain the different ARR behaviorsbetween the Na_xMnO_2 and Li_xMnO_2, which can not only reveal the origin ofARR in the kinetic aspect, but also provide a new insight for the developmentof high-capacity metal oxide cathode materials for LIBs/SIBs.

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