新型炭材料2021，Vol.36Issue(2)：390-400,11.DOI:10.1016/S1872-5805(21)60023-15
新型核壳结构硅碳复合负极材料的制备及电化学性能
Preparation and electrochemical properties of novel silicon-carbon composite anode materials with a core-shell structure
摘要
Abstract
Multi-component porous Si-SiOx (pSi) consisting of Si, SiO and SiO2 was formed by the pretreatment of SiO at 950 °C for 3 h in an inert atmosphere (He) using a disproportionation reaction. Hybrids of pSi and carbon nanofibers (pSi-CNFs) with a core-shell structure were prepared by catalytic chemical vapor deposition (CVD) using Fe-Ni species as the catalyst and a mixture of CO/H2/C2H4 (volumetric ratio 3:1:1) as the reactant for 0.5, 1 and 2 h, and were characterized by SEM, TEM, EDS, XRD, Raman spectroscopy and XPS. Results indicate that the pSi-CNF particle sizes are 5?20 μ m with the diameters of the CNFs being 5?40 nm. The CNFs are uniformly coated on the surface of the pSi to form a core-shell structure. Electrochemical performance testing shows that the reversible capacity of the pSi-CNF (0.5 h) remains at 1411 mAh.g?1 and the capacity retention is 74％ after 100 cycles at a current density of 0.2 A.g?1. The reversible capacity remains at 735 mAh.g?1 at a current density of 1 A g?1 after 300 cycles with a ca-pacity retention of 86％. In the pSi, Si and SiO provide the electrochemical reversible capacity. The core-shell structure with the CNF coating effectively improves the conductivity of the composites, and also inhibits the volume expansion of silicon to maintain the in-tegrity of the core shell structure.关键词
硅碳复合/负极材料/化学气相沉积/碳纳米纤维Key words
Silicon carbon composite/Anode material/Chemical vapor deposition/Carbon nanofiber分类
通用工业技术引用本文复制引用
金恒超,孙骞,王际童,马成,凌立成,乔文明..新型核壳结构硅碳复合负极材料的制备及电化学性能[J].新型炭材料,2021,36(2):390-400,11.基金项目
National Science Foundation of China(U1710252,21978097),and China Petrochemical Company Limited Fund(218025).国家自然科学基金(U1710252,21978097)和中国石油化工有限公司基金(218025). （U1710252,21978097）
