Long-term cycling behavior of asymmetric activated carbon/MnO₂ aqueous electrochemical supercapacitor

详细信息    查看全文

• 作者：Thierry Brousse ; Pierre-Louis Taberna ; Olivier Crosnier ; Romain Dugas ; Philippe Guillemet ; Yves Scudeller ; Yingke Zhou ; Fré ; dé ; ric Favier ; Daniel Bé ; langer ; Patrice Simon
• 关键词：Supercapacitor ; Electrochemical capacitor ; Asymmetric device ; MnO₂ ; Activated carbon
• 刊名：Journal of Power Sources
• 出版年：2007
• 出版时间：8 November 2007
• 年：2007
• 卷：173
• 期：1
• 页码：633-641
• 全文大小：688 K

文摘

Activated carbon–MnO₂ hybrid electrochemical supercapacitor cells have been assembled and characterized in K₂SO₄ aqueous media. A laboratory cell achieved 195,000 cycles with stable performance. The maximal cell voltage was 2 V associated with 21 ± 2 F g⁻¹ of total composite electrode materials (including activated carbon and MnO₂, binder and conductive additive) and an equivalent serie resistance (ESR) below 1.3 Ω cm². Long-life cycling was achieved by removing dissolved oxygen from the electrolyte, which limits the corrosion of current collectors. Scaling up has been realized by assembling several electrodes in parallel to build a prismatic cell. A stable capacity of 380 F and a cell voltage of 2 V were maintained over 600 cycles. These encouraging results show the interest of developing such devices, including non-toxic and safer components as compared to the current organic-based devices.