This technology involves creating a conductive polymer binder with carboxyl groups by mixing aniline and anthranilic acid monomers in an approximately 1:1 molar ratio and polymerizing them at room temperature using an ammonium persulfate initiator. It covers the entire manufacturing process, from binder synthesis to electrode coating and cell assembly.
While silicon has a capacity about 10 times higher than graphite, it suffers from volume expansion of 300–400% during charge and discharge cycles, which causes particles to fracture and leads to the repeated formation of an SEI layer on new surfaces, resulting in poor coulombic efficiency. Existing conductive binders like polyaniline (PANI) have struggled to withstand this expansion due to low adhesion and high synthesis costs.
In this technology, the carboxyl groups of the anthranilic acid interact with the silicon surface to enhance adhesion and mechanical strength, while the aniline backbone maintains electrical conductivity, simultaneously improving battery lifespan and power output. The binder is obtained through short-duration, room-temperature polymerization followed by acetone filtration, significantly reducing synthesis costs. Applicable to high-capacity silicon anode batteries for electric vehicles and large-scale energy storage systems, this technology offers a cost-effective solution to electrode degradation, a major hurdle in the commercialization of silicon.
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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