ScholarWorks@중앙대학교

초록

Conventional dry-processed electrode (DPE) fabrication using polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF) offers a solvent-free alternative to wet-coating processes that rely on toxic N-methyl-2-pyrrolidone. However, traditional DPE systems often struggle with a trade-off between internal cohesion and interfacial adhesion, limiting electrode integrity and electrochemical performance under high-loading conditions. Herein, an advanced dual-binder DPE (DB-DPE) architecture that integrates PTFE and PVDF with a nanostructured aluminum current collector (NSA) is presented. This synergistic system leverages PTFE's fibrillation-induced cohesion and PVDF's adhesive strength, while the NSA's nanoporous morphology enables robust mechanical interlocking at the electrode-collector interface. The resulting electrodes, fabricated with an ultrahigh active material content of 96 wt.% and minimal binder content of 2 wt.%, exhibit reduced interfacial resistance, excellent mechanical integrity, and enhanced ionic and electronic conductivity. This architecture enables the fabrication of high-mass-loading cathodes (up to 64 mg cm-2, 12.5 mAh cm-2) with superior performance, achieving a high volumetric energy density of 712.7 Wh L-1.

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