Carbon materials can effectively enhance the electrochemical performance of silicon electrodes and mitigate the volume changes of silicon anodes during charging and discharging. In this work, we prepared silicon-carbon composites using phenolic resin as the precursor for carbon.
Graphite currently serves as the main material for the negative electrode of lithium batteries. Due to technological advancements, there is an urgent need to develop anode materials with high energy density and excellent cycling properties.
Based on EIS, SEM, and XPS characterization of electrodes with different cycles, the presence of amorphous carbon ensures that silicon materials remain relatively stable during long cycles, effectively reducing electrode damage caused by volume expansion and contraction of active materials. This has a positive impact on stabilizing SEI.
It is evident that the amorphous carbon-coated silicon electrode material exhibits a bigger R SEI indicating that the phenolic resin-derived amorphous carbon possesses a porous structure with a large specific surface area facilitating the formation of more R SEI during lithium-ion–solvent (EC/DEC) side reactions in electrochemical processes.
Due to the unique merits and the increasing attention of Si electrode materials, the preparation of Si by magnesiothermic reduction has been widely explored. It should be mentioned first that the widely used Si-containing raw materials are silica, silicon oxides, silicon tetrachloride, Si-rich biomass, silicates, and minerals.
Due to technological advancements, there is an urgent need to develop anode materials with high energy density and excellent cycling properties. Potential anode materials for Li-ion batteries include lithium metal , transition metal oxides , and silicon-based materials .