摘要
将纳米Si粉以一定配比分散在石油重油中,在高压反应釜中经过460℃自升压热解反应,再经900℃炭化制备一种锂离子二次电池负极用纳米硅/炭(Si/C)复合材料。考察了纳米Si粉添加量对产物收率、微观结构及电化学性能的影响。结果表明:纳米Si粉的加入有助于提高固体产物的收率;在纳米Si/C复合材料中纳米Si粉均匀地镶嵌于炭基体中;纳米Si粉的晶型在热解反应前后没有发生变化。当纳米Si粉与石油重油质量比为5∶100时制备的纳米Si/C复合电极材料具有498mAh/g的首次可逆比容量和90%的充放电效率。
A nano-Si/C composite as the anode material for a lithium-ion secondary battery was prepared by polymerization and condensation of petroleum heavy oil with dispersed nano-Si powders at 460 ℃ and carbonization at 900 ℃. The influences of adding nano-Si powders to heavy oil on yield, microstructures and electrochemical properties were investigated. Results showed that the addition of nano-Si powders is beneficial for increasing the yield of solid products. Nano-Si powders were uniformly embedded in the carbon matrix and the crystallinity of nano-Si powders had no change before and after polymerization. The nano-Si/C composite had a first reversible capacity of 498 mAh/g and a cycle efficiency of 90 %.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期235-241,共7页
New Carbon Materials
基金
北京市科技新星计划(2003B09)
留学回国人员科研启动基金(505285)~~
关键词
石油重油
硅粉
复合材料
锂离子二次电池
负极材料
Heavy oil
Si powders
Composite
Lithium ion secondary battery
Anode materials
