Synthesis and Electrochemical Performance of Silicon/Carbon Composite Anodes through Ball Milling and Spray Drying Pyrolysis Process
A facile method was developed to synthesize amorphous carbon coated nano-sized silicon and graphite by using glucose or pitch as organic carbon source, nano-sized silicon particles were uniformly coated onto the artificial graphite by combined ball milling and spray drying pyrolysis, and the effect of binder types, binder amounts on the precursor morphology, feed rate and spray pressure on the electrochemical performance were investigated in detail.The partial size, surface morphology and electrochemical performances of the as-synthesized powders were analyzed by particulate size description analyzer (PSDA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and constant current charge/discharge tools.It is found that, citric acid and binder are important for improving the flee-aggregation of nano-sized silicon and the morphology of combined silicon and graphite.Therefore, under the optimal experimental conditions, amorphous carbon from pitch coated nano-sized silicon and graphite composite anodes exhibits much higher electrochemical performance.It can deliver the first discharge specific capacity of 796.3mA.h/g at a current density of 100 mA/g, as well as 85% of initial coulombic efficiency.Additionally, the discharge specific capacity retains 724.9mA.t/g, and the discharge capacity retention of a half cell system is 91% after 50 cycles.
Si/C composite ball milling spray dying pyrolysis anode material Li-ion battery
Ying WANG Hao WU Fang-Ming XIAO Ren-Heng TANG Tai SUN
Guangdong Province Key Laboratory of Rare Earth Development and Application,Guangzhou 510650, PR China;Guang Dong Research Institute of Rare Metals, Guangzhou 510650, China
国际会议
银川
英文
56-63
2017-08-16（万方平台首次上网日期，不代表论文的发表时间）