A comparative study of activated carbon-based symmetric supercapacitors in Li2SO4 and KOH aqueous electrolytes

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• 作者：Xianzhong Sun (1)
  Xiong Zhang (1)
  Haitao Zhang (1)
  Dacheng Zhang (1)
  Yanwei Ma (1) ywma@mail.iee.ac.cn
• 关键词：Supercapacitors – ; Activated carbon – ; Aqueous electrolyte – ; Lithium sulfate
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：16
• 期：8
• 页码：2597-2603
• 全文大小：578.9 KB
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• 作者单位：1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190 People鈥檚 Republic of China
• ISSN：1433-0768

文摘

In this work, we have prepared activated carbon (AC)-based symmetric supercapacitor (SC) using Li₂SO₄ aqueous electrolyte instead of H₂SO₄ and KOH and obtained a device with an improved cell voltage window (CVW) of 0 − 1.6 V from 0 to 1.0 V. The SC using KOH electrolyte is also fabricated for comparison. The electrochemical characteristics of SCs such as cyclic voltammetry (CV), galvanostatic charge–discharge, electrochemical impedance spectroscopy (EIS) and cycle stability are investigated systematically. The possible redox reactions of electrodes that occurred in Li₂SO₄ and KOH electrolytes that restrict the CVWs are discussed. The results indicate that in the case of Li₂SO₄, the AC electrode can deliver a specific capacitance of 210 F g−1 at a current density of 0.1 A g−1, and the energy density of capacitor can be as high as 16.9 Wh kg−1 at 200 W kg−1 (based on the total mass of active electrode materials), 80% higher than that in the case of KOH.