Lithium composite compounds with anionic framework isostructural to Laves Mg₂Cu lattice as solid Li-ion conductors

摘要

A series of solid-state lithium ion composite electrolytes is described. The composite materials have lithium ions in an anionic framework wherein the anionic framework has lithium ion vacancies or interstitial Li⁺ sites. The anionic framework lattice is isostructural to a Laves Mg₂Cu lattice and the lithium ion (Li⁺) conductivity of the solid state lithium ion electrolyte is at least 10⁻⁴ S/cm. The activation energy for lithium ion migration in the solid state lithium ion electrolyte is 0.36 sV or less. Composites of specific formulae are provided.