无机材料学报2011，Vol.26Issue(6)：619-624,6.DOI:10.3724/SP.J.1077.2011.00619
锂离子电池负极材料用针状焦的石墨化机理及其储锂行为
Graphitization Mechanisms and Electrochemical Performance of Needle Coke Anode for Li-ion Battery
摘要
Abstract
Effects of heat-treatment temperature on the microstructure and electrochemical properties of coal based needle coke were investigated by TG-DTG, XRD, SEM, XPS analysis and the charge/discharge, cyclic voltammetry curves. The graphitization mechanism of needle coke is suggested as well as the Li+ extraction-insertion behaviors. With the heat-treatment temperature increasing, the graphite-like crystal grows continuously attended with a complicated process, including the arrangement of crystal along radial/axial direction, dislocation dispersion among graphite layers, hexagonal carbon formation, crystal edge dispersion and folded graphite layer turning to plane. Meanwhile, the driving-forces are far different for different process. When needle coke is graphitized at 2800 ℃, it exhibits a lower charge/discharge potential and stable charge/discharge platform, and the insertion capacitance of Li+ can maintain at 305mAh/g even after charge/discharged for 40 cycles.关键词
针状焦/负极材料/锂离子电池/石墨化Key words
needle coke/ anode material/ lithium ion battery/ graphitization分类
化学化工引用本文复制引用
王邓军,王艳莉,詹亮,张秀云,刘春法,乔文明,凌立成..锂离子电池负极材料用针状焦的石墨化机理及其储锂行为[J].无机材料学报,2011,26(6):619-624,6.基金项目
国家863重点项目(2008AA062302) （2008AA062302）
国家自然科学基金(20806024,50672025,5073003,51002051) （20806024,50672025,5073003,51002051）
中央高校基本科研业务费专项基金(WA1014016) （WA1014016）
