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• W4310901488 abstract "Abstract Poly(vinylidene fluoride) (PVDF)-based solid-state electrolytes with “Li salt-polymer-trace residual solvent” configuration are the most promising candidates for room-temperature solid-state batteries. However, we reveal that an unstable high concentration [Li(N, N-dimethylformamide (DMF)) x ] + solution structure is locally aggregated in PVDF matrix acting as solid diluent, which presents strong intermolecular interactions with PVDF that greatly restricts the high throughput ion transport and interfacial stability. Here, we propose a universal strategy to construct stable weakened solvation environment by partially replacing the DMF using 2,2,2-trifluoroacetamide (TFA). The TFA presents much lower binding energy with both Li + and PVDF than DMF, which synchronously achieve high ionic conductivity (7.0×10 -4 S cm -1 ) and Li transference number (0.67) of PVDF-based electrolyte. The TFA can also tailor the solvation structures to form abundant contact ion pairs and aggregates that generate inorganic-rich interfaces to greatly enhance the stability with both Li metal anode and high voltage cathode. The developed composite electrolyte enables record cycling of 2890 and 600 hours in solid-state Li||Li symmetric cells at 0.5 mA cm-2 and 1 mA cm-2, respectively. The solid-state Li||LiNi 0.8 Co 0.1 Mn 0.1 O 2 full cells show ultra-long lifespan of 4900 and 3000 times with cut-off voltage of 4.3 V and 4.5 V, respectively, and deliver superior stability under practical conditions from -20 to 45 °C and pouch cell level." @default.
• W4310901488 created "2022-12-20" @default.
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• W4310901488 date "2022-12-09" @default.
• W4310901488 modified "2023-10-16" @default.
• W4310901488 title "Trace weak solvation environment enabling ultra-stable high-voltage solid-state lithium metal battery" @default.
• W4310901488 doi "https://doi.org/10.21203/rs.3.rs-2274974/v1" @default.
• W4310901488 hasPublicationYear "2022" @default.
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