Propagation topography of redox phase transformations in heterogeneous layered oxide cathode materials.

ABSTRACT: 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 topographie

SUBMITTER: Mu L 

PROVIDER: S-EPMC6052144 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature