A Conductive Self-healing Hydrogel Binder with Quadruple-Hydrogen-Bonded Supramolecular for High-performance Silicon Anodes in Lithium Ion Batteries
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초록
내용
With extremely high specific capacity, silicon has been viewed as the ideal anode material. However, silicon anode suffers from the severe volume changes during repeated charge-discharge cycles, leads to pulverization of silicon particle, all of which rapidly decrease the capacity. In this respect, the design of binder plays a critical role in improving capacity retention. In this study, we show conductive self-healing hydrogel binder synthesized through crosslinking of PEDOT:PSS and polyacrylic acid substituted with quadruple-hydrogen-bonded supramolecular. The 3D self-healable network could suppress the huge volume change of Si particles during cycles by self-healing by quadruple hydrogen bonding while providing electron transport pathway through the conducting polymer. An electrode prepared with this conductive self-healing binder exhibits improved capacity retention through the suppressing the volume change and rate performance through the high electrical conductivity.