Silicon Anode Improvement Methods
The main solutions to the challenges of the silicon anode used in lithium-ion batteries are divided into the following three categories:
1.Compounds derived from silicon; carbon materials and metals are the two primary materials used in research to prepare silicon-based compounds. Several types of carbon materials are used in this process. However, silicon/graphite and silicon/graphene are good suggestions from an industrial perspective, since they have high capacity at the same time as the industrial characteristics of graphite/graphene. Two major challenges of these compounds are the non-uniform distribution of silicon on the graphite substrate as well as the method of preparing large quantities of these materials. Among other interesting compounds, germanium-silicon alloy compounds can be mentioned.
2. Preparation of nanostructured materials based on silicon (coating silicon compound); The preparation of nanostructures as a shell for silicon compound is one of the most effective methods of controlling volume changes. This reduces the direct contact of silicon with the electrolyte, increasing conductivity, and, as a result, improving cyclability and ratability. Carbon materials, graphene, and silicon oxide are among the most important compounds used to cover silicon materials. The "composition section" highlighted the importance of carbon materials, including graphene, and their impact on silicon performance. Small companies used the first two solutions in their patents are as follows.
3. Develop additives and electrolytes; these compounds are viewed not only as components of batteries but also as the most influential components of the electrochemical properties of batteries. Considering that the compounds used in these materials directly affect the combination of the interface and the conductivity of silicone compounds, controlling the properties of these compounds can improve the performance of the anode and battery.
Synthesized silicon materials often benefit from this method because it enhances their properties.
Thus, improving the electrolyte of silicon material is considered a conventional means of improving its properties. Although only a small number of companies are actively involved in developing these additives, the rest of the researchers in this field may be satisfied with simply using them.
In our recent report, we examined the types of electrolyte additives used in silicone-anode-based LIBs, along with companies and their research.