This technology addresses the volume expansion of silicon-based anodes by chemically bonding carbon quantum dots containing specific functional groups with water-soluble binders through photo (IPL) or thermal condensation polymerization. The resulting composite provides robust cross-linking for the electrode active material.
Silicon anode active materials suffer from poor cycle life due to significant volume expansion and contraction during charge and discharge cycles. Furthermore, conventional polymer binders often lead to reduced electrical conductivity and complex manufacturing processes.
This technology involves mixing carbon quantum dots, which contain hydroxyl, amino, or carboxyl groups, with a water-soluble binder such as PAA, and then irradiating the mixture with intense pulsed light (IPL) to induce dehydration condensation polymerization, forming a binder composite. This composite firmly secures the active material while providing electrical conduction paths. It can be applied to high-capacity anodes for electric vehicles with high silicon content and to rapid-charging smartphone battery electrode processes. By completing cross-linking in just milliseconds of light exposure, it reduces the burden on drying equipment and enhances electrode conductivity.
This invention was developed with support from the Ministry of Science and ICT for the development of flexible zinc-ion micro-batteries applicable to wearable devices.
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