This technology forms a core-shell structured anode active material by using a polymer binder to hydrogen-bond a 2D scaffold-type oxidized carbon-based nanostructure, functionalized with oxidizing agents and additives, onto the outer surface of silicon microparticles.
Silicon anodes suffer from severe volume expansion during charge and discharge cycles, leading to particle pulverization and electrical isolation. This process also causes the repeated formation of an unstable solid electrolyte interphase (SEI), resulting in rapid capacity degradation and electrode deterioration.
This technology functionalizes carbon-based nanomaterials like CNTs into a 2D scaffold form through oxidation and uses a polymer binder, such as CMC, to uniformly coat them onto silicon microparticles via hydrogen bonding, effectively suppressing volume expansion and minimizing SEI formation. As a simple, centrifuge-based wet process, it can be applied to mass-production lines for high-capacity silicon anodes, fast-charging EV cells, and high-density smartphone batteries, enabling stable cycle life even with micro-silicon instead of expensive nano-silicon.
This invention was developed with support from the Ministry of Science and ICT for the development of semiconductor single nanoparticle manufacturing with multiple heterojunctions and high-efficiency/high-selectivity photoelectrochemical Solar-to-X devices.
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