A thin layer including a carbon material improves the rate capability of an electric double layer capacitor

作者：Sato Takaya^*; Marukane Shoko; Morinaga Takashi; Uemura Taichi; Fukumoto Kunihiro; Yamazaki Satoshi

来源：Journal of Power Sources, 2011, 196(5): 2835-2840.

DOI：10.1016/j.jpowsour.2010.10.095

• Electric double layer capacitor
• Rate performance
• Polymeric thin layer including a carbon material
• Chitosan
• Pyromellitic acid

We present a new method to improve the rate capability of an electric double layer capacitor (EDLC) using a thin polymer layer having a high concentration of carbon material on a current collector (CLC). A novel thermocuring coating composed of a glycol-chitosan, a pyromellitic acid and a conductive carbon powder can form stable CLC on a metal foil current collector simply by spreading and curing at 160 degrees C for a couple of minutes. We compared the performance of some demonstration EDLC cells using three kinds of current collector: a conventional aluminum oxide foil for EDLC, an aluminum foil and an aluminum foil with CLC. The cell with the CLC had a much higher rate capability than the cell without CLC. Only the CLC cell was able to discharge at a current density of 500C. This cell shows a slight deterioration in capacity in a high temperature, continuous charging, life test, and the CLC has a suppressing effect on the internal resistance increase of EDLCs. The use of a CLC film current collector is one of the most effective and simple methods for the improvement of EDLC rate performance. In particular, a current collector consisting of aluminum foil coupled with a CLC promises to be a low cost alternative to the aluminum oxide foil commonly used in EDLCs.

• 出版日期2011-3-1