A fundamental stability study for amorphous LiLaTiO3 solid electrolyte

Zhangfeng Zheng, Hua Zhi Fang, Zi-kui Liu, Yan Wang

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27 Scopus citations

Abstract

In this study, amorphous lithium lanthanum titanate (LLTO) powders were prepared by a sol-gel method with an all alkoxide based route. Results showed that unlike its crystalline counterpart which turns into an electronic conductor in direct contact with lithium metal, amorphous LLTO remains to be an ionic conductor and hence is compatible with lithium metal as solid electrolyte although it also undergoes lithium insertion and the consequent reduction of Ti4+ to Ti3+. This striking difference between crystalline and amorphous LLTO could be ascribed to the atomic configuration difference, ordered versus disordered. The electronic states of a disordered system could be localized. It was found that the transference number of lithium ions of amorphous LLTO is over 82%. Our results on electrochemical measurements indicated that amorphous LLTO is stable with blocking electrodes up to 12 V, which can potentially be used with high voltage cathode materials.

Original languageEnglish (US)
Pages (from-to)A244-A248
JournalJournal of the Electrochemical Society
Volume162
Issue number1
DOIs
StatePublished - Jan 1 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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