A high-quality aqueous graphene conductive slurry applied in anode of lithium-ion batteries

Abstract

Through a combination of mechanical agitation, ultrasonic dispersion, and modification by different dispersants, including polyvinyl pyrrolidone, sodium lignin sulfonate, and carboxymethylcellulose sodium (CMC), a graphene conductive slurry for lithium-ion batteries anode is prepared. These dispersants can inhibit the agglomeration of graphene and help to build the conductive network when graphene slurry used as a conductive agent for lithium-ion batteries. The SiOx/graphene-CMC electrode shows an excellent electrochemical performance with a first charge/discharge capacity of 1273.8/1723.7 mAh/g and a Coulomb efficiency of 73.9% at a constant current of 100 mA/g. The capacity retention rate of the lithium-ion battery is 84% (1070.2 mAh/g) after 100 cycles under current of 200 mA/g. The results indicate that the dispersant treatment provides a simple mass production method to disperse graphene stably, and the graphene conductive slurry can employ for high-performance SiOx anodes conductive agent.