Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Theoretical capacities of silicon is about 4,000mAh/g and is higher than carbon-based materials. When silicon reacts with lithium ion, the reaction brings to big volume changes of 400%, which causes mechanical stress. For that reason, some disadvantages are caused such as destroying the electrode, separating from collector electrode, forming an unstable interface layer between active material and electrolyte. Carbon coated silicon oxide with hierarchical pores was prepared to form buffers which released the volume change. After generating SiO2/ZnO composite, carbon was coated with PVC. After preparing carbon coated SiO2/ZnO composite, ZnO was dissolved by acid treatment. Acid treated materials have hierarchical pore structures.
C-SiO2/ZnO composite was synthesized with carbon via sol-gel method and decomposition of PVC. Zn(NO3)2∙H2O, C2H5OH, H2O and TEOS were stirred at 60℃ to form Zn containing SiO2 by sol-gel synthesis. It was dried at 80℃ and heated at 650℃ under air. It was mixed with PVC and thermally decomposed at 900℃ under Ar to form carbon-coated SiO2/ZnO composite. It was put into the acid solution to dissolve out ZnO. Finally carbon-coated SiO2 with hierarchical pore structure was prepared.
Because of the effect of amorphous SiO2 and carbon, XRD pattern shows broad and higher peaks. TG-DTA showed that water and residual organic materials were eliminated at 200℃ and SiO2 was formed crystalline structure at about 800℃. BET surface area was increased dramatically by removing ZnO in the case of Zn:Si:C=1:1:8. C-Si02/ZnO-01 (Zn:Si:C=1:1:8) appeared best cycling performance at 50 cycles, but the capacity was increased up to 10 cycles. To enhance electrochemical performances of C-SiO2/ZnO composites, optimized ratio of the materials is needed.
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