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首页> 外文期刊>Nature Communications >Propagation topography of redox phase transformations in heterogeneous layered oxide cathode materials
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Propagation topography of redox phase transformations in heterogeneous layered oxide cathode materials

机译：异质层状氧化物阴极材料中氧化还原相变的传播形貌

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摘要

Redox phase transformations are relevant to a number of metrics pertaining to the electrochemical performance of batteries. These phase transformations deviate from and are more complicated than the conventional theory of phase nucleation and propagation, owing to simultaneous changes of cationic and anionic valence states as well as the polycrystalline nature of battery materials. Herein, we propose an integrative approach of mapping valence states and constructing chemical topographies to investigate the redox phase transformation in polycrystalline layered oxide cathode materials under thermal abuse conditions. We discover that, in addition to the three-dimensional heterogeneous phase transformation, there is a mesoscale evolution of local valence curvatures in valence state topographies. The relative probability of negative and positive local valence curvatures alternates during the layered-to-spinel/rocksalt phase transformation. The implementation of our method can potentially provide a universal approach to study phase transformation behaviors in battery materials and beyond.
机译：氧化还原相变与许多与电池的电化学性能有关的指标有关。由于阳离子和阴离子化合价态的同时变化以及电池材料的多晶性质，这些相变偏离并比常规的相成核和传播理论更为复杂。在此，我们提出了一种映射价态和构建化学拓扑结构的综合方法，以研究热滥用条件下多晶层状氧化物阴极材料中的氧化还原相变。我们发现，除了三维异质相变外，在价态拓扑中还存在局部价态曲率的中尺度演化。负到正价态曲率的相对概率在层状到尖晶石/岩盐相变过程中交替出现。我们方法的实施可能会提供一种通用的方法来研究电池材料及其他材料中的相变行为。

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