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Silicon-Based Anode Polymer Binder for Lithium Ion Batteries

ID# 2012-4004
Chemical Structure of PAA & PVA

Technology Summary

This invention is a smart binder consisting of a reversible polymer network, which has a flexible architecture with restorative capability, to mitigate the large volume changes of silicon anodes upon lithium insertion and extraction. Typically this polymer binder is composed of poly-acrylic acid (PAA) and poly-vinyl alcohol (PVA). By enhancing the properties of the anode binders used with the silicon, the smart binder can improve electrochemical performance along with improved coulombic efficiency, cyclability, and rate performance. This flexible and reversible network architecture can also prevent the disintegration of the silicon particles and help keep electrical contact between silicon and conductive carbon during cycling.

Application & Market Utility

Electric vehicles are looking to use lithium ion batteries. Silicon has been extensively investigated as an electrode material due to its high capacity and low charge-discharge potential. However, silicon suffers from extremely large volume changes (>300%), which mechanically disintegrate the silicon-based anodes. The smart bidner disclosed here mitigates the large volume changes of silicon anodes. It improves electrochemical performance; improve coulombic efficiency, cyclability, and rate performance; and uses a flexible and reversible network architecture.

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