Crystal Structures and Cathode Properties of Chemically and Electrochemically Delithiated LixNi0.5Mn0.5O2with Applications to Mg Rechargeable Batteries

Naoya Ishida, Naoto Yamazaki, Toshihiko Mandai, Naoto Kitamura, Yasushi Idemoto

Research output: Contribution to journalArticlepeer-review

Abstract

Both electrochemically and chemically delithiated layered rock-salt LixNi0.5Mn0.5O2 were successfully synthesized to investigate their crystal structures and cathode properties in the Mg rechargeable batteries. While the electrochemically delithiated LixNi0.5Mn0.5O2 (x = 0.1 or 0.5) showed reversible behavior only two cycles in a Mg cell with subphase after initial discharge, the chemically delithiated Li0.45Ni0.5Mn0.5O2 delivered a discharge capacity of 175 mAh g-1 with an average potential of 2.4 V vs Mg/Mg2+ during several cycles. The chemically delithiated structure with x = 0.45 was found to be able to intercalate Mg ions according to the Rietveld analysis for synchrotron XRD patterns and XANES spectra for discharged electrode. It was concluded that the chemically delithiated Li0.45Ni0.5Mn0.5O2 provided the favored structure for Mg intercalation due to the appropriate interlayer distance.

Original languageEnglish
Article number100547
JournalJournal of the Electrochemical Society
Volume167
Issue number10
DOIs
Publication statusPublished - 6 Jan 2020

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