This technology relates to a graft copolymer featuring a chitosan backbone derived from crustacean shells and side chains of a carboxyl-containing aniline polymer copolymerized with aniline and anthranilic acid, as well as a lithium-ion battery using this copolymer as a binder for silicon anodes.
Silicon anodes undergo significant volume changes during charge and discharge cycles, requiring binders that can withstand such stress. Conventional PVdF and SBR binders rely on weak van der Waals interactions with silicon particles, failing to effectively mitigate volume expansion. Furthermore, PVdF requires the use of N-methyl-2-pyrrolidone (NMP), which is both toxic and expensive.
This technology combines high-mechanical-strength chitosan with highly conductive aniline polymers to provide strong adhesion to silicon particles while establishing effective electron transport pathways. Chitosan can be obtained inexpensively from crustacean shell waste, and the copolymer can be easily synthesized through highly reproducible radical polymerization. Applicable to high-capacity silicon-anode lithium-ion batteries for EVs and ESS, this solution eliminates the need for toxic solvents, extends cycle life, and reduces binder production costs.
This invention was developed with support from the Ministry of Education for the development of blue carbon biomass-based source materials and the establishment of a marine resource recycling platform.
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