SYNTHESIS OF Si/GRAPHENE/SUPER-P COMPOSITE APPLIED TO ANODE MATERIALS FOR FAST CHARGE-DISCHARGE FOR LI-ION BATTERIES

Abstract

Lithium-ion batteries (LIBs), characterized by high capacity, extended lifespan, and environmental
friendliness, have emerged as a leading choice in energy storage technology. However, silicon (Si) as an
anode material presents significant challenges due to excessive volumetric expansion during charge and
discharge cycles, leading to structural damage and performance degradation. In this study, we investigated
and successfully synthesized a Si/Super P: graphene composite material using a ball milling technique to
examine the impact of carbon content ratios on the stability and specific capacity of the material.
Experimental results indicated that the Si/30% Super P: 50% graphene composite demonstrated the highest
electrochemical performance (initial specific capacity of 1500 mAh.g-1
), maintaining stable specific capacity
(Coulombic efficiency > 90%) after 100 cycles and capable of fast charge-discharge at high current rates
(10C). The study underscores the importance of integrating conductive Super P carbon with graphene,
which forms a conductive network enhancing Li+
transport and reducing internal resistance during charging
and discharging. The Si/C (graphene and Super P carbon) composite material, with the combination of
Super P carbon and graphene, not only provides an effective solution to mitigate Si volumetric expansion
but also extends the application potential of Si in commercial anode materials for LIBs, promising a
breakthrough in modern battery technology.