Lattice Oxygen Instability in Oxide-Based Intercalation Cathodes: A Case Study of Layered LiNi1/3Co1/3Mn1/3O2

Xueyan Hou, Kento Ohta, Yuta Kimura, Yusuke Tamenori, Kazuki Tsuruta, Koji Amezawa, Takashi Nakamura

Research output: Contribution to journalArticlepeer-review

Abstract

Oxide-based cathode materials are key components of secondary batteries, for example, alkali metal-ion and anion batteries, sufficient stability of which is thus vital for ensuring high energy density and safety. However, problems originating from the lattice oxygen instability in oxide-based intercalation cathodes are widely reported, such as capacity degradation, gas generation, and thermal runaway, highlighting the importance of deep insights into the critical factors for lattice oxygen stability. In this work, lattice oxygen stability in layered rock-salt LiNi1/3Co1/3Mn1/3O2−δ is investigated with a focus on oxygen release behavior and relevant changes in crystal and electronic structures. Release of lattice oxygen facilitates cation mixing, transition metal slab expansion, and Li slab contraction, thus deteriorating the layered structure. As is revealed by X-ray absorption spectroscopy, in the beginning stage of oxygen release, the charge balance is compensated by selective reduction of Ni3+. This strongly suggests that high valent Ni generated by delithiation or negative defect species, that is, lithium at the transition metal site ((Formula presented.) TM), aggravates oxygen release severely. The findings of this work provide a new research direction and guidelines for the stabilization of lattice oxygen in oxide-based intercalation cathodes.

Original languageEnglish
Article number2101005
JournalAdvanced Energy Materials
Volume11
Issue number30
DOIs
Publication statusPublished - 2021 Aug 12

Keywords

  • gas generation
  • intercalation cathodes
  • lattice oxygen instability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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