A Sol-Gel Solid Electrolyte with High Lithium Ion Conductivity

Pu-Wei Wu, Steven R. Holm, Anh T. Duong, Bruce Dunn*, Richard B. Kaner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

A new hybrid inorganic gel electrolyte has been synthesized by the sol-gel method. The inorganic gel electrolyte is based on the immobilization of a liquid electrolyte in an inorganic silica network. The former is responsible for ionic conduction, while the latter provides a three-dimensional microporous environment to support the liquid electrolyte. The synthesis involves mixing equal amounts by weight of a hydrolyzed silica precursor and a lithium ion conducting liquid electrolyte. The conductivity of the partially dried gel is 3.5 × 10-3 S cm-1 at room temperature and approaches 10-2 S cm-1 at 80°C. The temperature dependence of the conductivity follows an Arrhenius relation with an activation energy of 0.15-0.17 eV over the temperature range 30-80°C. NMR data confirm the lithium ion mobility and show its liquidlike behavior over this temperature range. TGA and DSC results indicate that the inorganic gel electrolyte is stable to 90°C and that the thermal stability is simply limited by the liquid electrolyte. FT-IR and mass spectrometry establish that there is no water present in the dried material.

Original languageEnglish
Pages (from-to)1004-1011
Number of pages8
JournalChemistry of Materials
Volume9
Issue number4
DOIs
StatePublished - 1 Jan 1997

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