Surface-modification-assisted synthesis of in-situ graphene-doped carbon substrate coated silicon nanoparticles for boosting lithium storage performance

Authors：Shi, Jian^*; Li, Ruiqian; Li, Jingwei^*; Liu, Guicheng

Source：Powder Technology, 2023, 430: 118988.

DOI：10.1016/j.powtec.2023.118988

• Silicon/carbon anode
• Surface modification
• Co-pyrolysis method
• In-situ graphene
• Multilayer architecture

Improving the electrical conductivity and structural integrity of Si/C anodes is of great concern for lithium-ion batteries which can be effectively achieved by doping graphene. However, it is difficult to achieve graphene-doped Si/C composites with good interface contact and conductive architecture. Herein, an in-situ graphenedoped carbon coated silicon nanoparticles (SiNPs) with multilayer architecture is designed. SiNPs is firstly modified and coated by polymethyl methacrylate (PMMA) shell. Multilayer carbon architecture is constructed via co-pyrolysis method using PMMA and citric acid as carbon sources. It displays an excellent lithium storage performance with a reversible discharge capacity of 2117.5 mAhg(-1) at 200 mAg(-1). These impressive anodic properties are chiefly benefited from the ingenious carbon architecture coated SiNPs involving in-situ graphene with a strong interfacial bonding interaction. Overall, this investigation can not only broaden the application potential in LIBs for advanced Si/C anodes but also provide an alternative route on designing a graphene-related material.