Nonstoichiometry and Li-ion transport in lithium zirconate: The role of oxygen vacancies

Xiaowen Zhan, Yang Tse Cheng, Mona Shirpour

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Understanding Li-ion migration mechanisms and enhancing Li-ion transport in Li2ZrO3 (LZO) is important to its role as solid absorbent for reversible CO2 capture at elevated temperatures, as ceramic breeder in nuclear reactors, and as electrode coating in high-voltage lithium-ion batteries (LIBs). Although defect engineering is an effective way to tune the properties of ceramics, the defect structure of LZO is largely unknown. This study reports the defect structure and electrical properties of undoped LZO and a series of cation-doped LZOs: (i) depending on their charge states, cation dopants can control the oxygen vacancy concentration in doped LZOs; (ii) the doped LZOs with higher oxygen vacancy concentrations exhibit better Li+ conductivity, and consequently faster high-temperature CO2 absorption. In fact, the Fe (II)-doped LZO shows the highest Li-ion conductivity reported for LZOs, reaching 3.3 mS/cm at ~300°C that is more than 1 order of magnitude higher than that of the undoped LZO.

Original languageEnglish
Pages (from-to)4053-4065
Number of pages13
JournalJournal of the American Ceramic Society
Volume101
Issue number9
DOIs
StatePublished - Sep 2018

Bibliographical note

Publisher Copyright:
© 2018 The American Ceramic Society

Keywords

  • dopants/doping
  • electrical properties
  • lithium-ion transport
  • nonstoichiometry
  • oxygen vacancies

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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