Publication date: 10th April 2024
Intensive research is being conducted to further improve the performance of lithium-ion secondary batteries. Conventional positive electrode materials exhibit excellent charge-discharge cycle characteristics because only Li-ions are extracted and inserted while maintaining the crystalline structure of the material. In contrast, Li-rich layered oxide (LLO) materials with a low-crystalline structure achieve high energy density and extraction/insertion of a large amount of Li-ions. In this study, X-ray total scattering measurements were performed at the high-energy X-ray diffraction beamline BL04B2 at the SPring-8 synchrotron radiation facility (Sayo, Japan). The crystal structure variations during the charging and discharging of LLO were evaluated. The structural parameters in the various states of charge/discharge of LLO material 0.4Li2MnO3−0.6LiNi0.5Mn0.5O2 were determined through a crystal pair distribution function-based structural refinements using experimental G(r). Crystal pair distribution function analysis reveals that the constituent transition metals migrate substantially due to delithiation in the initial irreversible charging. We clarified the existence of a low-crystal structure in LLO formed by the crystal structure change accompanying the migration of pillar metal ions that support the Li-deficient layer during the extraction of Li-ions [1].
This research was supported by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research 23H02068 Basic Research (B) and JP19H05814 Grant-in-Aid for Scientific Research on Innovative Areas “Energy Storage Solid Interface Science”.
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