Direct recycling of shorted solid-state electrolytes enabled by targeted recovery

Solid-state batteries (SSBs) present an opportunity for simultaneously offering high energy density and safety. Yet sustainable developments of SSBs have been hindered due to the dendrite-induced short-circuit of solid-state electrolytes (SSEs) and the lack of recycling routes. Here we provide a targeted recovery strategy to directly recycle shorted garnet-type Li6.5La3Zr1.5Ta0.5O12 SSEs based on a detailed investigation of Li dendrites. We find that garnet grains can in-situ react with dendritic Li and its derivate by a one-step annealing at 900°C, which enables a rapid recovery of shorted garnets. Moreover, electrochemical properties of garnets can be well restored even after multiple short-circuits, significantly extending their lifespans. Economic and environmental analysis shows the superiorities of targeted recovery strategy in thrifting fabrication time, energy consumptions and production costs. Such a simple yet efficient recovery strategy would advance sustainable developments of solid-state batteries.