摘要
研究了针状焦、沥青焦原料的物化性质对其石墨化样品的微结构及其用作锂离子电池负极材料电极性能的影响机制。研究结果表明:(1)因针状焦在制备过程中存在沥青的净化以及中间相的形成、融并和有序排列过程,导致在相同石墨化条件下,针状焦比沥青焦更易于石墨化;(2)经2800℃石墨化处理后,针状焦的d002、La、Lc值分别为0.3373nm、56.05nm、27.11nm,而石墨化沥青焦的La、Lc仅为石墨化针状焦的53.4%;(3)石墨化针状焦经反复充放电40次后,其嵌锂容量能稳定在301mAh/g,而石墨化沥青焦却只有240mAh/g。
Graphitized cokes were prepared from needle coke and pitch coke to be used as anode material for Li-ion battery.Effect of the physical chemistry of the two cokes on the microstructure and electrochemical properties of their graphitized samples were investigated.The results indicate that needle coke was easier to be graphitized than pitch coke,because it was derived from purified mesophase pitch.When needle coke was graphitized at 2800℃,the values of d_002,La,Lc were 0.3373nm,56.05nm,27.11nm,respectively,while the La,Lc value of graphitized pitch coke was 53.4% of that of graphitized needle coke.The Li~＋ extraction capacitance of graphitized needle coke could maintain at 301mAh/g after it was charge/discharged for 40 cycles,while it was only 240mAh/g for graphitized pitch coke.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2011年第2期204-209,共6页
Journal of Materials Science and Engineering
基金
国家863重点资助项目(2008AA062302)
国家自然科学基金资助项目(20806024
50672025
5073003
51002051)
上海市国际合作资助项目(08160704000)
关键词
针状焦
沥青焦
负极材料
锂离子电池
needle coke
pitch coke
anode material
lithium ion battery
