A Low‐Cost and Scalable Carbon Coated SiO‐Based Anode Material for Lithium‐Ion Batteries

ChemistryOpen

Zhihao Huang¹  Prof. Quansheng Zhang¹  Yuanyu Sun¹  Wenping Jiang¹  Meng Yu¹  Prof. Jingying Xie²  Guoju Dang² 

[1] Department of Chemical Engineering Shanghai institute of Technology Shanghai 201418 China;Department of Research and Development Shanghai Power and Energy Storage Battery System Engineering Technology Research Center Shanghai 200245 China;

关键词: Anode;    carbon coating;    Lithium-ion battery;    polyvinyl pyrrolidone;    SiO;   

DOI  :  10.1002/open.202000341

来源: DOAJ

【 摘 要 】

Abstract Silicon monoxide (SiO) is considered as one of the most promising alternative anode materials thanks to its high theoretical capacity, satisfying operating voltage and low cost. However, huge volume change, poor electrical conductivity, and poor cycle performance of SiO dramatically hindered its commercial application. In this work, we report an affordable and simple way for manufacturing carbon‐coated SiO−C composites with good electrochemical performance on kilogram scales. Industrial grade SiO was modified by carbon coating using cheap and environment friendly polyvinyl pyrrolidone (PVP) as carbon source. High‐resolution transmission electron microscopy (HRTEM) and Raman spectra results show that there is an amorphous carbon coating layer with a thickness of about 40 nm on the surface of SiO. The synthesized SiO−C‐650 composite shows great electrochemical performance with a high capacity of 1491 mAh.g−1 at 0.1 C rate and outstanding capacity retention of 67.2 % after 100 cycles. The material also displays an excellent performance with a capacity of 1100 mAh.g−1 at 0.5 C rate. Electrochemical impedance spectroscopy (EIS) results also prove that the carbon coating layer can effectively improve the conductivity of the composite and thus enhance the cycling stability of SiO electrode.

【 授权许可】

Unknown