A flexible electron-blocking interfacial shield for dendrite-free solid lithium metal batteries

Abstract Solid-state batteries (SSBs) are considered to be the next-generation lithium-ion battery technology due their enhanced energy density and safety. However, high electronic conductivity of solid-state electrolytes (SSEs) leads Li dendrite nucleation proliferation. Uneven electric-field distribution resulting from poor interfacial contact can further promote dendritic deposition lead rapid short circuiting SSBs. Herein, we propose a flexible electron-blocking shield (EBS) protect garnet degradation. The EBS formed by an in-situ substitution reaction not only increase lithiophilicity but also stabilize volume change, maintaining integrity interface during repeated cycling. Density functional theory calculations show electron-tunneling barrier metal EBS, indicating excellent capacity for electron-blocking. protected cells exhibit improved critical current 1.2 mA cm ?2 stable cycling over 400 h at 1 (1 mAh ) room temperature. These results demonstrate effective strategy suppression dendrites present fresh insight into rational design SSE interface.