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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.
- Source :
- Batteries; Jun2023, Vol. 9 Issue 6, p322, 12p
- Publication Year :
- 2023
-
Abstract
- 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 -CF<subscript>2</subscript>-, which easily continuously reacts with lithium metal, resulting in the instability of the solid electrolyte interface (SEI), which intensifies the formation of lithium dendrites. Herein, Tetrafluoro-1,4-benzoquinone (TFBQ) was selected as an additive in trace amounts to the PVDF/Li-based electrolytes. TFBQ uniformly formed lithophilic quinone lithium salt (Li<subscript>2</subscript>TFBQ) in the SEI. Li<subscript>2</subscript>TFBQ has high lithium-ion affinity and low potential barrier and can be used as the dominant agent to guide uniform lithium deposition. The results showed that PVDF/Li-TFBQ 0.05 with a mass ratio of PVDF to TFBQ of 1:0.05 had the highest ionic conductivity of 2.39 × 10<superscript>−4</superscript> S cm<superscript>−1</superscript>, and the electrochemical stability window reached 5.0 V. Moreover, PVDF/Li-TFBQ CSE demonstrated superior lithium dendrite suppression, which was confirmed by long-term lithium stripping/sedimentation tests over 2000 and 650 h at a current of 0.1 and 0.2 mA cm<superscript>−2</superscript>, respectively. The assembled solid-state LiNi<subscript>0.6</subscript>Co<subscript>0.2</subscript>Mn<subscript>0.2</subscript>O<subscript>2</subscript>||Li cell showed an excellent performance rate and cycle stability at 30 °C. This study greatly promotes the practical research of solid-state electrolytes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 23130105
- Volume :
- 9
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Batteries
- Publication Type :
- Academic Journal
- Accession number :
- 164576438
- Full Text :
- https://doi.org/10.3390/batteries9060322