Abstract ▼ AI-Helper

As the electric vehicle industry grows rapidly, a significant demand the demand for of high-capacity lithium ion batteries has been increasing. As a result, many studies are being conducted to develop materials with providing higher capacity than common graphite anode active materials, and silicon (...

As the electric vehicle industry grows rapidly, a significant demand the demand for of high-capacity lithium ion batteries has been increasing. As a result, many studies are being conducted to develop materials with providing higher capacity than common graphite anode active materials, and silicon (theoretical capacity: 4,200 mAh/g) is known as one of the most promising materials. However, since silicon undergoes a large volume change (>400%) during charging and discharging, it is vulnerable to use as itself difficult to use it as an anode active material.

In order to solve the problem of silicon, this study conducted research on making the composite of silicon and reduced graphene oxide. Silicon was surface-treated with APTES to induce chemical bonding with reduced graphene oxide and that can be found in the analyzed results. According to the results, it has been confirmed that the chemical bonding between silicon and reduced graphene oxide was formed as expected. Optimal results were obtained when the concentration of APTES was 50% and the content of reduced graphene oxide was 5%.

By the result of this study, the silicon/reduced graphene oxide composite obtained about twice more discharge capacity even after 100 charge/discharge cycles compared to with bare silicon.