Characteristics and electrochemical performance of the LiMn2O4 with TiO2 surface layer in lithium secondary batteries

Cheon Soo Kim, Keon Kim, Cheol Woo Yi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

To reduce high dissolution of manganese ions (Mn3+) into the electrolytes in lithium-ion batteries, causing severe capacity loss during storage and cycle, TiO2 is simply coated onto LiMn2O4 powders by the sol-gel method and investigated by various analytical techniques. Whereas the surface layer of TiO2 on LiMn2O4 powders is stable up to 600 °C, annealing at and above 700 °C induces the reaction of TiO2 surface layer with LiMn2O4 host particle. The passive TiO2 layer on LiMn2O4 annealed at 500 °C effectively suppress Mn dissolution at room temperature and even higher temperature (55 °C). Moreover, TiO2-coated LiMn2O4 annealed at 500 °C improves the cycle property at high voltage of 4.50 V charging and even at high temperature. Hence, TiO2-coated LiMn2O4 can be a promising candidate of cathode active material for lithium-ion batteries.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalJournal of Ceramic Processing Research
Volume16
Issue number2
Publication statusPublished - 2015

Bibliographical note

Publisher Copyright:
© 2015, Hanyang University. All rights reserved.

Keywords

  • LiMnO
  • Mn dissolution
  • Surface modification
  • TiO

ASJC Scopus subject areas

  • Ceramics and Composites

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