Solid Electrolytes: Alkali-Ion Transport in Skeleton Structures

Abstract

A new three-dimensional K(+)-ion conductor, K(1.9)Mg(0.95)Si(1.05) o(4) has been identified. Its resistivity at 300C is 28 ohm-cm, less than one- fourth the value for the best potassium beta-alumina. More definitive measurements have been made of the Na(+)-ion transport in Na3Zr2Si2PO12 (NASICON). Its resistivity at 300C is 3 ohm-cm, compared with 4 ohm-cm for beta double prime-alumina. Moisture tests have shown that NASICON is insensitive to water vapor. Static tests in molten Na2S4 for 10 days at 400C indicate chemical stability; similar tests in molten Na and dynamic tests in a Na-Na cell are in progress. Conclusive evaluation of stability awaits the preparation of additional test specimens.

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1976
Accession Number
ADA032342

Entities

People

  • Henry Y. P. Hong
  • James A. Kafalas
  • John B. Goodenough
  • Kirby Dwight

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Alkali Metals
  • Cell Size
  • Chemical Stability
  • Chemistry
  • Conductivity
  • Crystal Structure
  • Crystals
  • Diameters
  • Dynamic Tests
  • Energy
  • Heat Of Activation
  • High Temperature
  • Measurement
  • Metals
  • Static Tests
  • Three Dimensional
  • Water Vapor

Fields of Study

  • Materials science

Readers

  • Battery Technology and Engineering
  • Electrochemical Engineering/ Fuel Cell Technologies
  • Mechanical Engineering/Mechanics of Materials.