The effects of the mixing of an active material and a conductive additive on the electrochemical performance of an electric double layer capacitor (EDLC) electrode were investigated. Coin-type EDLC cells with an organic electrolyte were fabricated using the electrode samples with different ball-milling times for the mixing of an active material and a conductive additive. The ball-milling time had a strong influence on the electrochemical performance of the EDLC electrode. The homogeneous mixing of the active material and the conductive additive by ball-milling was very important to obtain an efficient EDLC electrode. However, an EDLC electrode with an excessive ball-milling time displayed low electrical conductivity due to the characteristic change of a conductive additive, leading to poor electrochemical performance. The mixing of an active material and a conductive additive played a crucial role in determining the electrochemical performance of EDLC electrode. The optimal ball-milling time contributed to a homogeneous mixing of an active material and a conductive additive, leading to good electrochemical performance of the EDLC electrode.

1. Introduction
 2. Experimental Procedure
 3. Results and Discussion
 4. Conclusion
 Acknowledgements
 References

• Inchan Yang(Department of Chemical Engineering, Myongji University, Yongin 449-728, Korea)
• Soon Hyung Kwon(Department of Chemical Engineering, Myongji University, Yongin 449-728, Korea)
• Bum-Soo Kim(R&D Center, Vitzrocell Co. Ltd., Chungnam 340-861, Korea)
• Sang-Gil Kim(R&D Center, Vitzrocell Co. Ltd., Chungnam 340-861, Korea)
• Byung-Jun Lee(R&D Center, Vitzrocell Co. Ltd., Chungnam 340-861, Korea)
• Myung-Soo Kim(Department of Chemical Engineering, Myongji University, Yongin 449-728, Korea)
• Ji Chul Jung(Department of Chemical Engineering, Myongji University, Yongin 449-728, Korea) Corresponding author