Lithiophilic Quinone Lithium Salt Formed by Tetrafluoro-1,4-Benzoquinone Guides Uniform Lithium Deposition to Stabilize the Interface of Anode and PVDF-Based Solid Electrolytes

Poly(vinylidene fluoride) (PVDF)-based composite solid electrolytes (CSEs) are attracting widespread attention due to their superior electrochemical and mechanical properties. However, the PVDF has a strong polar group -CF2-, which easily continuously reacts with lithium metal, resulting in instability of electrolyte interface (SEI), intensifies formation dendrites. Herein, Tetrafluoro-1,4-benzoquinone (TFBQ) was selected as an additive trace amounts PVDF/Li-based electrolytes. TFBQ uniformly formed lithophilic quinone salt (Li2TFBQ) SEI. Li2TFBQ high lithium-ion affinity low potential barrier can be used dominant agent guide uniform deposition. The results showed that PVDF/Li-TFBQ 0.05 mass ratio 1:0.05 had highest ionic conductivity 2.39 × 10−4 S cm−1, stability window reached 5.0 V. Moreover, CSE demonstrated dendrite suppression, confirmed by long-term stripping/sedimentation tests over 2000 650 h at current 0.1 0.2 mA cm−2, respectively. assembled solid-state LiNi0.6Co0.2Mn0.2O2||Li cell excellent performance rate cycle 30 °C. This study greatly promotes practical research