Electrochemical Synthesis of Nano-Structured Si and Graphene Composite for Li Ion Battery

Abstract

The application of lithium-ion batteries is widespread across a variety of sectors, such as portable electronic gadgets, mobile phones, new electric car batteries, and many others. Silicon–Graphene (SiG) anodes are among the sophisticated anode materials that have been used in lithium-ion batteries. These anodes have been widely researched because of their high capacity, strong operating potential, environmental friendliness and great abundance. SiG anodes have shown a lot of promise as a potential anode material for lithium-ion batteries [1]. This is due to the fact that they have solved many issues that were present in Si anodes, including particle pulverization, shedding and failures of electrochemical performance during lithiation and delithiation. Nevertheless, there are still certain issues that need to be improved, such as low initial discharge efficiency, poor conductivity and poor cycle performance. This research focuses on presenting a unique approach that may be used to address the issues associated with Si anode materials. An electrodeposition method that only needs a single unit operation, is applied in the process of constructing composites of SiG from G-1M SiCl4 in [BMIm]Tf2N ionic liquid (IL) [2]. In SiG composites, both silicon and graphene have been seen to have a layered structure (Fig.1 a). The SiG anode displays a specific charge/discharge capacity of 1133/ 2272 mAhg-1 at the first cycle and it drops to 676/ 737 mAhg-1 at the conclusion of 100 cycle at 0.2C (Fig.1b), which demonstrates a robust cycle ability at a moderate rate. The present work will thus discuss on the development of SiG composite by electrochemical method for its utility as negative electrode material in Li ion battery.