A Low-Cost Nano/Micro Structured-Silicon-MWCNTs from Nano-Silica for Lithium Storage

作者：Feng, Xuejiao; Ding, Tengda; Cui, Hongmin^*; Yan, Nanfu; Wang, Fei

来源：Nano, 2016, 11(3): 1650031.

DOI：10.1142/S1793292016500314

• Silicon
• nano/micro structure
• multiwall carbon nanotubes
• spray drying
• lithium-ion battery

Despite the fact that silicon material can be synthesized from various sources, deriving them from silica resources is of strategic significance for the industrial processing. Here a low-cost nano/micro structure of Si-CNT was derived from nano-SiO2 and multiwall carbon nanotubes (MWCNTs) with simple methods. By employing table salt (NaCl) as a heat scavenger for the magnesiothermic reduction, the nano/micro structure of the material was remained effective. Comparing to ball milling, a combination of SiO2, MWCNTs and NaCl by spray drying achieved the long cycle life for Si-CNT composite. This material presented a stable capacity above 968.1 mAh g(-1) with excellent capacity retention of 85.4% at the 150th cycle versus the 2nd one. The Si nanoparticles, very small particle size in 10-20 nm, homogenously dispersed in electronically conductive network of MWCNTS, which accommodate the volume change of Si and reinforce highly conductivity of the Si-CNT composite during repeated cycles. Combined with its low-cost and up-scaling technologies, Si-CNT composite is a promising anode material in rechargeable lithium batteries with high electrochemical performance.

• 出版日期2016-3
• 单位中国科学院长春应用化学研究所; 江西省科学院; 淮北师范大学