Synthesis, Characterization, and Electrochemical Properties of Magnesium Birnessite and Zinc Chalcophanite Prepared by a Low-Temperature Route

Abstract

Magnesium-substituted birnessite and zinc chalcophanite have been synthesized through a novel procedure based on a combination of coprecipitation and metal ion intercalation techniques. The materials showed very promising performance as hosts for lithium intercalation. Upon galvanostatic discharge, Mg−birnessite and Zn−chalcophanite composite cathodes were able to intercalate >2 equiv of lithium per mole.