Solid‐State Electrolyte Design for Lithium Dendrite Suppression

• DOI: 10.1002/adma.202002741
• Publication Date: 2020-10-09T16:22:42Z
• Authors: Xiao Ji; Singyuk Hou; Pengfei Wang; Xinzi He; Nan Piao; Ji Chen; Xiulin Fan; Chunsheng Wang
• Keywords: Dendrite (mathematics); Lithium metal; Quasi-solid

Abstract All‐solid‐state Li metal batteries have attracted extensive attention due to their high safety and energy density. However, dendrite growth in solid‐state electrolytes (SSEs) still hinders application. Current efforts mainly aim reduce the interfacial resistance, neglecting intrinsic dendrite‐suppression capability of SSEs. Herein, mechanism for formation dendrites is investigated, Li‐dendrite‐free SSE criteria are reported. To achieve a capability, SSEs should be thermodynamically stable with interface against Li, they low electronic conductivity ionic conductivity. A cold‐pressed 3 N–LiF composite used validate design criteria, where highly conductive N reduces plating/stripping overpotential, LiF suppresses by enhancing nucleation suppressing penetration into The layer coating on PS 4 achieves record‐high critical current >6 mA cm −2 even at capacity 6.0 mAh . Coulombic efficiency also reaches record 99% 150 cycles. N–LiF/Li enables LiCoO 2 cathodes 101.6 g −1 50 principle opens new opportunity develop high‐energy all‐solid‐state batteries.