Development and Application of a Poly(acrylic acid)-Grafted Styrene–Butadiene Rubber as a Binder System for Silicon-Graphite Anodes in Li-Ion Batteries

Silicon anodes require polymer binder systems that are both mechanically robust and electrochemically stable, to accommodate the dramatic volume expansion experienced during cycling operation. Herein, we report use of a poly(acrylic acid)-grafted styrene–butadiene rubber (PAA-g-SBR) with 80% partially neutralized Na-PAA as system for silicon-graphite anodes. The PAA-g-SBR graft copolymer was synthesized by grafting tert-butyl acrylate onto SBR treating intermediate H3PO4. PAA-g-SBR/Na-PAA found provide superior electrochemical performances Na-PAA/SBR system. Na-PAA/PAA-g-SBR had stable capacity retention 673 mAh g–1 130 cycles, while decline immediately. also displayed more preferable mechanical properties, lower Young’s modulus value larger strain at failure compared Overall, these findings indicate promising application silicon in next generation lithium-ion batteries.