摘要
研究了酚醛树脂包覆对天然石墨电化学性能的改善。酚醛树脂热解后形成的包覆石墨首次放电容量达到了460mAh·g-1以上,高于未处理石墨(384mAh·g-1);考察了热处理温度对包覆石墨性能的影响,结果表明在600℃～1000℃的范围内,随着热处理温度的升高,材料的不可逆容量降低,首次充电容量和循环效率提高;循环20周以后包覆石墨的容量仍保持在330mAh·g-1以上,而未处理石墨的容量则降低到300mAh·g-1以下,说明酚醛树脂包覆对抑制石墨的容量衰减有明显的作用。
Natural graphite was coated with phenol-formaldehyde resin and subsequently heat treated under high temperature, and its electrochemical performance as an anode for lithium ion batteries was investigated. The initial discharge capacity of the coated graphite was as high as 460 mAh(.)g(-1) which was higher than 384 mAh(.)g(-1) of untreated graphite. The higher the heat treatment temperature (HTT) within the range 600 degreesC similar to 1000 degreesC, the lower the irreversible capacity. The capacity of the coated graphite remained higher than 330 mAh(.)g(-1) even after 20 cycles, meanwhile that of untreated Graphite was lower than 300 mAh(.)g(-1) The results indicate that the capacity loss can be notablely decreased by such a coating.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
2002年第4期29-32,37,共5页
New Carbon Materials
基金
国家科技部基础研究重大项目前期研究专项项目(2001CCA05000)~~
