Lithiated cellulose nanofibers as a water-soluble binder for high-rate nanosized LiFePO4/C cathodes: Comparative degradation mechanisms across binder systems

초록

The use of lithiated cellulose nanofibers (CNF-Li) as water-soluble binders for high-rate nanosized LiFePO4/C (nLFP/C) cathodes in lithium-ion batteries (LIBs) was investigated in this study, with particular emphasis on fastcharging applications. By comparing conventional polyvinylidene fluoride (PVDF) and (2,2,6,6-tetramethylpiperidine-1-oxyl)-oxidized CNFs, we show that the CNF-Li binder offers marked advantages, including elimination of toxic organic solvents, enhanced dispersion of active materials in aqueous media, and a robust conductive network that significantly improves lithium-ion diffusivity. This improvement reduces interfacial resistance and lowers polarization, culminating in excellent electrochemical stability and morphological durability under intense cycling at high current densities. The superior performance and environmental compatibility of CNF-Li suggest that it is a promising binder for fast-charging LIB applications where both high-rate capability and longterm stability are required.

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