Novel insight into neutral medium as electrolyte for high-voltage supercapacitors
Novel insight into neutral medium as electrolyte for high-voltage supercapacitors
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DOI：
10.1039/c1ee02262h
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发表时间：
2012-02-01
影响因子：
32.5
通讯作者：
Frackowiak, Elzbieta
中科院分区：
文献类型：
--
作者：
Fic, Krzysztof;Lota, Grzegorz;Frackowiak, Elzbieta
本文重点介绍了中性水介质，即锂，钠和钾的硫酸盐溶液在广泛的浓度范围（0.1-2.5 mol L-1）作为有前途的电解质的电化学电容器，因为它们是廉价的，无腐蚀性，并允许应用不同的集流体。这些特性使得电容器组装过程更容易和更便宜。此外，这种电解质是电化学稳定的和环境友好的。电化学调查进行了特别是1摩尔L-1的Li 2SO 4水溶液证实了有效的电容器工作在更宽的电压范围内，即即使在2.2 V没有任何显着的电容衰减在15 000个周期的可能性。考虑了离子的物理化学性质（即溶剂化、扩散或迁移）及其对电容器电化学行为的影响。
This paper is focused on neutral aqueous medium, i.e. lithium, sodium and potassium sulfate solutions in a wide range of concentrations (0.1-2.5 mol L-1) as promising electrolytes for electrochemical capacitors because they are cheap, non-corrosive and allow applying diverse current collectors. These properties make the capacitor assembling process much easier and cheaper. Additionally, such electrolytes are electrochemically stable and environmentally friendly. Electrochemical investigations carried out especially for 1 mol L-1 Li2SO4 aqueous solution confirmed the possibility of efficient capacitor work in a wider voltage range, i.e. even at 2.2 V without any significant capacitance fade during 15 000 cycles. The physicochemical properties of ions (i.e. solvation, diffusion or mobility) and their influence on the capacitor electrochemical behaviour are considered.