Copper metal electrode reversibly hosts fluoride in a 16 KF aqueous electrolyte.

Fluoride is a promising charge carrier for batteries due to its high charge/mass ratio and small radius. Here, we report commercial copper powder exhibits a reversible capacity of up to 222 mA h g in a saturated electrolyte of 16 KF. This electrolyte suppresses dissolution of CuF, the charged product.

From Copper to Basic Copper Carbonate: A Reversible Conversion Cathode in Aqueous Anion Batteries.

Dual-ion batteries that use anions and cations as charge carriers represent a promising energy-storage technology. However, an uncharted area is to explore transition metals as electrodes to host carbonate in conversion reactions. Here we report the reversible conversion reaction from copper to Cu CO (OH) , where the copper electrode comprising K CO and KOH solid is self-sufficient with anion-charge carriers.