Dual-Solvent Supramolecular Assembly Enables Ampere-Hour Halide All-Solid-State Pouch Cell.
basic_science · Level V
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- Record sourced from PubMed, PMID 42494213.
- Also identified by DOI 10.1002/adma.74206.
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Abstract
Halide solid electrolytes (SSEs) hold promise for next-generation all-solid-state batteries (ASSBs), yet scalable fabrication of halide SSE films and ampere-hour-scale all-solid-state pouch cells (ASSPCs) via slurry coating has not been demonstrated. Here, we introduce a dual-solvent supramolecular assembly strategy that precisely regulates the chain organization of a multiblock copolymer binder (SEEPS), enabling low-binder, high-viscosity slurries for uniform halide SSE film formation. Methylcyclohexane and decane are identified as chemically compatible solvents that diminish InCl<sub>3</sub> surface precipitation in Li<sub>3</sub>InCl<sub>6</sub>, preserving ionic conductivity. The resulting Li<sub>3</sub>InCl<sub>6</sub>/Li<sub>6-</sub> <sub>x</sub>PS<sub>5-</sub> <sub>x</sub>Cl<sub>1+</sub> <sub>x</sub> bilayer SSE film exhibits high ionic conductivity (1.26 mS/cm), mechanical robustness, and electrochemical stability. ASSBs using NCM88 cathodes and micro-silicon anodes retain 71.3% capacity after 600 cycles at 0.5 C, while the first ten-layer ampere-hour-scale halide ASSPC delivers 1.45 Ah at 0.2 C with 95.1% capacity retention over 100 cycles. This approach establishes a practical and scalable pathway for fabricating halide ASSPCs, bridging laboratory innovations and commercial deployment.