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

doi:10.3724/SP.J.1077.2011.00619

无机材料学报 ›› 2011, Vol. 26 ›› Issue (6): 619-624.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

王邓军¹, 王艳莉¹, 詹亮¹, 张秀云², 刘春法², 乔文明¹, 凌立成¹

(1. 华东理工大学化学工程联合国家重点实验室, 上海 200237; 2. 上海宝钢化工有限公司, 上海 201900)

收稿日期:2010-08-12 修回日期:2010-09-26 出版日期:2011-06-20 网络出版日期:2011-06-07
作者简介:王邓军(1984-), 男, 硕士研究生.
基金资助:
国家863重点项目(2008AA062302); 国家自然科学基金(20806024, 50672025, 5073003, 51002051); 中央高校基本科研业务费专项基金(WA1014016)

Graphitization Mechanisms and Electrochemical Performance of Needle Coke Anode for Li-ion Battery

WANG Deng-Jun¹, WANG Yan-Li¹, ZHAN Liang¹, ZHANG Xiu-Yun², Liu Chun-Fa², QIAO Wen-Ming¹, LING Li-Cheng¹

(1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2. Baosteel Group Shanghai Chemical Corporation, Shanghai 200942, China)

Received:2010-08-12 Revised:2010-09-26 Published:2011-06-20 Online:2011-06-07
Supported by:
National Natural Science Foundation of China (50730003, 50672025, 20806024, 51002051); China 863 Program (2008AA062302); Fundamental Research Funds for the Central Universities (WA1014016)

摘要/Abstract

摘要： 通过考察煤系针状焦在700~2800℃热处理过程中石墨微晶结构的变化规律及其电化学性能, 并结合TG-DTG、XRD、SEM、XPS表征方法以及充放电、循环伏安曲线特征, 分析了针状焦的石墨化机理及其储锂机制. 研究结果表明, 随热处理温度的升高, 针状焦的类石墨微晶在不断长大的同时, 还存在微晶在径/轴向的排列、石墨层间位错线的消失、晶界间C-C六圆环的形成、晶界的消失以及石墨层“褶皱”的平面化等复杂过程, 且每个过程的驱动力不同. 针状焦经过2800℃石墨化后, 可获得较低的Li⁺充放电电位和稳定的充放电平台, 且反复充放电40次后的有效嵌锂容量为305mAh/g.

关键词: 针状焦, 负极材料, 锂离子电池, 石墨化

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.

Key words: needle coke, anode material, lithium ion battery, graphitization

中图分类号:

TQ127

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.

WANG Deng-Jun, WANG Yan-Li, ZHAN Liang, ZHANG Xiu-Yun, Liu Chun-Fa, QIAO Wen-Ming, LING Li-Cheng. Graphitization Mechanisms and Electrochemical Performance of Needle Coke Anode for Li-ion Battery[J]. Journal of Inorganic Materials, 2011, 26(6): 619-624.

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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

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