酚醛树脂炭包覆对天然微晶石墨电化学性能的影响  

Investigation on pyrolitic carbon-coated microcrystalline graphite as anode material for Li-ion batteries

作　　者：何月德[1] 刘洪波[1] 洪泉[1] 肖海河[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《功能材料》2013年第16期2397-2400,2405,共5页Journal of Functional Materials

基　　金：国土资源部公益性行业科研专项经费资助项目(201011031);中央高校基本科研业务费专项基金资助项目(531107040188);湖南省国土资源厅科技资助项目(2010-08)

摘　　要：以酚醛树脂包覆天然微晶石墨,经炭化处理制备得到锂离子电池用酚醛树脂炭包覆石墨负极材料。系统考察了酚醛树脂炭包覆量对微晶石墨晶体结构和电化学性能的影响。结果表明,酚醛树脂炭改善了天然微晶石墨的表面形貌,但未改变其晶体结构;包覆适量酚醛树脂炭可以提高负极材料的首次充放电效率,并且可以明显改善其大电流充放电下的循环性能。酚醛树脂包覆量为4%的酚醛树脂炭包覆石墨的首次充放电效率为81.4%,在0.5C的电流密度下经过50次循环后仍有257.9mAh/g的脱锂容量。The phenolic resin carbon-coated microcrystalline graphite, as anode materials for lithium-ion battery, was prepared by being coated with phenolic resin carbon by immersion method, following with carbon- ization. The influences of the content of phenolic resin carbon on the structure and electrochemical performances of microcrystalline graphite were investigated. The results show that the process improved the surface morphol- ogy of microcrystalline graphite without destructing its crystal structure. With the proper coating content （4%）, the initial coulombic efficiency increased to 81. 4%, and the deintercalation capacity remained 257. 9 mAh/g at the current density of 0.5C after 50 cycles. The high rate charge/discharge performance is improved dramatically.

关 键 词：锂离子电池 包覆 循环性能 酚醛树脂 天然微晶石墨 

分 类 号：TM912[电气工程—电力电子与电力传动]