Citation: SUN Xian-Zhong, ZHANG Xiong, ZHANG Da-Cheng, MA Yan-Wei. Activated Carbon-Based Supercapacitors Using Li₂SO₄ Aqueous Electrolyte[J]. Acta Physico-Chimica Sinica, ;2012, 28(02): 367-372. doi: 10.3866/PKU.WHXB201112131 shu

Activated Carbon-Based Supercapacitors Using Li₂SO₄ Aqueous Electrolyte

1.
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received Date: 11 October 2011
Available Online: 13 December 2011
Fund Project: 中国科学院知识创新工程重要方向项目(KJCX2-YW-W26) (KJCX2-YW-W26) 北京市科技计划项目( Z111100056011007) ( Z111100056011007)国家自然科学基金(21001103,51025726)资助 (21001103,51025726)

In this work, we prepared activated carbon-based symmetric supercapacitors using Li₂SO₄ aqueous electrolyte instead of H₂SO₄ and KOH, and obtained devices with an improved working voltage of 1.6 V from 1.0 V. Cyclic voltammetry and galvanostatic charging/discharging measurements were used to study the electrochemical properties. The results showed that the electrode specific capacitance can reach 129 F·g^-1, and the energy density can be as high as 10 Wh·kg^-1 at a power density of 160 Wh·kg^-1. Electrochemical impedance analysis measurements showed that the charge-transfer resistance of the capacitors decreased markedly with the increase of the concentration of Li₂SO₄, and the rate capability improved accordingly. The leakage current of the supercapacitor was 0.22 mA after constant-voltage charging at 1.6 V for 1 h, and the columbic efficiency was nearly 100%. The capacitance of the supercapacitor remained above 90% after 5000 charge-discharge cycles. Activated carbon-based supercapacitors using Li₂SO₄ aqueous electrolyte have many advantages, such as high working voltage, high energy density, and environmental compatibility, and therefore have od industrialization prospects.
- Supercapacitor,
- Activated carbon,
- Neutral aqueous electrolyte,
- Li₂SO₄
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Activated Carbon-Based Supercapacitors Using Li₂SO₄ Aqueous Electrolyte