Preparation and Capacitive Performance of the Anion Intercalation Graphite Materials as Positive Electrode Materials

doi:10.7503/cjcu20120634

Abstract

Abstract:

Microstructure and energy storage performance of the needle coke heated at 1500 and 2800 ℃ were investigated by scanning electron micrograph(SEM), cyclic voltammetry(CV) and charge-discharge methods, and the influence of the degree of graphitization to the performance of graphite was studied. The specific discharge capacity of needle coke sintered at 1500 and 2800 ℃ were 70.1 and 90.6 mA·h/g in organic electrolyte when the current density was controlled at 50 mA/g. The specific capacity was 55 mA·h/g when the current density was raised to 5 A/g. However, the specific capacity of commercialization active carbon was only 35.9 mA·h/g when the current density was controlled at 50 mA/g. The retention of the capacitance after 1000 charge-discharge cycles were 95.7% and 89.2%, respectively, when the current density was controlled at 1 A/g.

Key words: Electrochemical capacitor, Positive electrode, Graphite, Insertion

CLC Number:

O646

TrendMD:

LI Ran, ZHANG Hao, ZHANG Xiang-Lan, CAO Gao-Ping. Preparation and Capacitive Performance of the Anion Intercalation Graphite Materials as Positive Electrode Materials[J]. Chem. J. Chinese Universities, 2013, 34(4): 959.

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