LI Bao-hua, WANG Guan, ZHAI Deng-yun, DU Hong-da| KANG Fei-yu, . The effect of the microstructure of mesophase-pitch-based activated carbons on their electrochemical performance for electric double layer capacitors. New Carbon Mater., 2011, 26(3): 192-196.
Citation:
LI Bao-hua, WANG Guan, ZHAI Deng-yun, DU Hong-da| KANG Fei-yu, . The effect of the microstructure of mesophase-pitch-based activated carbons on their electrochemical performance for electric double layer capacitors. New Carbon Mater., 2011, 26(3): 192-196.
LI Bao-hua, WANG Guan, ZHAI Deng-yun, DU Hong-da| KANG Fei-yu, . The effect of the microstructure of mesophase-pitch-based activated carbons on their electrochemical performance for electric double layer capacitors. New Carbon Mater., 2011, 26(3): 192-196.
Citation:
LI Bao-hua, WANG Guan, ZHAI Deng-yun, DU Hong-da| KANG Fei-yu, . The effect of the microstructure of mesophase-pitch-based activated carbons on their electrochemical performance for electric double layer capacitors. New Carbon Mater., 2011, 26(3): 192-196.
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China|
2.
Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Funds:
National Natural Science Foundation of China(50632040, 50802049, 50972065 and 50902079), Guangdong Province Innovation R & D Team Plan and Shenzhen Technical Plan Project (JP200806230010A, SG200810150054A).
LI Bao-hua(1974-), male, Associate Professor, engaged in the research of the electrode materials of lithium ion battery and electrochemical capacitor. E-mail: libh@mail.sz.tsinghua.edu.cn
Corresponding author:
KANG Fei-yu, Professor. Tel/Fax: +86-755-2603-6118
Activated carbons (ACs) prepared from mesophase pitch and carbonized mesophase pitch by KOH activation were used to fabricate electrodes for electric double layer capacitors. Nitrogen adsorption at 77K was used to characterize the specific surface area and pore structure of the ACs, which showed a bimodal pore size distribution. The performance of the ACs in an organic electrolyte (1mol/L of Et4NBF4 in propylene carbonate) was investigated with voltage sweep cyclic voltammetry and constant current charge-discharge cycling. Results show that the capacitance of the ACs not only depends on the surface area and pore size distribution, but also on carbonization treatment. SEM images show that the AC particles from carbonized pitch are formed by stacking of layered slices, which favors an infiltration of solvent into the inner surface of the carbon and improves the capacitance per unit area of micropores.
DownLoad: