A Reversible Rocksalt to Amorphous Phase Transition Involving Anion Redox.

ABSTRACT: The charge-discharge capacity of lithium secondary batteries is dependent on how many lithium ions can be reversibly extracted from (charge) and inserted into (discharge) the electrode active materials. In contrast, large structural changes during charging/discharging are unavoidable for electrode materials with large capacities, and thus there is great demand for developing materials with reversible structures. Herein, we demonstrate a reversible rocksalt to amorphous phase transition involving anion redox in a Li₂TiS₃ electrode active material with NaCl-type structure. We revealed that the lithium extraction during charging involves a change in site of the sulfur atom and the formation of S-S disulfide bonds, leading to a decrease in the crystallinity. Our results s

SUBMITTER: Sakuda A 

PROVIDER: S-EPMC6180042 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature