Operando monitoring of charging-induced defect formation in battery electrodes by positrons

Gregor Klinser, Harald Krenn, Stefan Koller, Roland Würschum

Research output: Contribution to journalArticle

Abstract

The defect specific technique of positron-electron annihilation is utilized in an appropriate electrochemical cell for operando monitoring of vacancy-type defect formation which occurs in battery electrodes upon charging, using the cathode material LiNi 1/3 Mn 1/3 Co 1/3 O 2 as a case study. The variation of the positron lifetime with charging-induced Li ion extraction indicates the formation of divacancies and vacancy agglomerates in a progressive amount as well as a reordering of vacancy agglomerates to one-dimensional vacancy chains at the end of charging. A remarkable correlation of the charging-induced variation of the positron lifetime with that of Li ion diffusion data in the literature has been found.

Original languageEnglish
Article number013905
Pages (from-to)013905
JournalApplied Physics Letters
Volume114
Issue number1
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fields of Expertise

  • Advanced Materials Science

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