Nano Letters
Nano Letters
5 years ago

Role of Crystal Symmetry in the Reversibility of Stacking-Sequence Changes in Layered Intercalation Electrodes

Role of Crystal Symmetry in the Reversibility of Stacking-Sequence Changes in Layered Intercalation Electrodes
Anton Van der Ven, Y. Shirley Meng, Maxwell D. Radin, Judith Alvarado
The performance of many technologies, such as Li- and Na-ion batteries as well as some two-dimensional (2D) electronics, is dependent upon the reversibility of stacking-sequence-change phase transformations. However, the mechanisms by which such transformations lead to degradation are not well understood. This study explores lattice-invariant shear as a source of irreversibility in stacking-sequence changes, and through an analysis of crystal symmetry shows that common electrode materials (graphitic carbon, layered oxides, and layered sulfides) are generally susceptible to lattice-invariant shear. The resulting irreversible changes to microstructure upon cycling (“electrochemical creep”) could contribute to the degradation of the electrode and capacity fade.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b03989

DOI: 10.1021/acs.nanolett.7b03989

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