Control of electronic conductivity and ionic conductivity of mixed electron–ion conductor and their effects on lithium plating

Solid-state batteries assembled by lithium anode exhibit high energy density and high safety, but the volume change and interface problem hinder their applications. It is an effective method to buffer the volume change by preparing a mixed electron–ion conductor as a composite lithium anode, but there are few studies on plating lithium in the mixed electron–ion conductor. Here, a mixed electron–ion conductor was prepared by carbon nanotubes and gel polymer electrolyte, and the electronic and ionic conductivity of the mixed electron–ion conductor are controlled by controlling the carbon content. The effect of electronic/ionic conductivity on lithium plating was studied. It was found that lithium can be plated inside the relatively loose mixed electron–ion conductor. GPE-Carbon Cloth composite anode was prepared, and the status of lithium plating on it was analyzed by XRM. The electrochemical performance test shows that G@CC has a good Coulombic efficiency and cycle stability.