Preparation and Properties of Silicon Carbon Composites Using the Thermal Plasma Method

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Fan, Yakun^1 ; Wan, Xiaohan^1 ; Ma, Wenhui^1^2 ; Huang, Xin^1 ; Chen, Zhengjie^1

National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming

650093, China^1

State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming

650093, China^2

关键词: Brunauer emmett tellers;    Constant current charging;    Negative active materials;    Reversible capacity;    Silicon-carbon composites;    Specific capacities;    Structure and properties;    Thermal plasma method;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/2/022054/pdf
DOI  :  10.1088/1755-1315/252/2/022054

来源: IOP

【 摘 要 】

Silicon-carbon composites were prepared from industrial silicon powders and graphite powder using the thermal plasma method. The structure and properties of the composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), Raman spectroscopy, and constant current charge-discharge tests. The results revealed that spherical nano-silicon/graphene can be prepared when the carbon content in raw materials is more than 30%. The size of the nano-sicilion/graphene prepared by the one-step method was about 6.6um×10.6um, and inserted nano-silicion were ∼30nm. The nano-silicon/graphene composites were used as negative active materials to make lithium-ion batteries. The first specific capacity was 339 mAh/g. The constant current charging and discharging tests were carried out at 1 C. The first discharge specific capacity was about 339 mAh/g and a reversible capacity of 150 mAh/g was retained after 50 cycles at a current density of 1000 mAh/g.