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

doi:10.3724/SP.J.1077.2011.00619

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (6): 619-624.DOI: 10.3724/SP.J.1077.2011.00619

• Research Paper • Previous Articles Next Articles

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)

Abstract

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

CLC Number:

TQ127

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

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