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A systematically comparative study on LiNO3 and Li2SO4 aqueous electrolytes for electrochemical double-layer capacitors

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成果类型:
期刊论文
作者:
Jiang, Jianbo;Liu, Beibei;Liu, Guiyu;Qian, Dong;Yang, Chunming;Li, Junhua
通讯作者:
Qian, Dong(qiandong6@vip.sina.com)
作者机构:
[Liu, Guiyu; Qian, Dong; Liu, Beibei; Jiang, Jianbo] Hunan Provincial Key Laboratory of Chemical Power Resources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
[Li, Junhua] Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, College of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421008, China
[Jiang, Jianbo] College of Chemistry and Chemical Engineering, Jishou University, Jishou, 416000, China
[Qian, Dong] State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China
[Yang, Chunming] College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081, China
通讯机构:
[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.
[Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.
语种:
英文
关键词:
Aqueous electrolyte - Electrochemical double-layer capacitors - Electrochemical performance - Electrochemical potential - Maximum concentrations - Neutral electrolytes - Physicochemical property - Supercapacitive performance
期刊:
Electrochimica Acta
ISSN:
0013-4686
年:
2018
卷:
274
页码:
121-130
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:化学;WOS学科类别:Electrochemistry
入藏号:
WOS:000432158000015;EI:20181705037572
基金类别:
National Natural Science Foundation of China [21171174, 21505035]; Provincial Natural Science Foundation of Hunan [2016JJ3028]; State Key Laboratory of Powder Metallurgy; Hunan Provincial Science and Technology Plan Project [2017TP1001]
机构署名:
本校为通讯机构
院系归属:
化学与材料科学学院
摘要:
In this work, highly soluble LiNO<inf>3</inf>was adopted as the neutrally aqueous electrolyte for active carbon (AC)-based electrochemical double-layer capacitors (EDLCs), of which the electrochemical performances were evaluated. Simultaneously, the physicochemical properties such as the ionic conductivity and viscosity of the LiNO<inf>3</inf>aqueous solution were investigated. As compared with the most studied Li<inf>2</inf>SO<inf>4</inf>aqueous solution, the LiNO<inf>3</inf>aqueous solution displays more favorable physicochemical properties and electrochemical performances as the neutral electrolytes for EDLCs. To be specific, the conductivity of the 5.0 M LiNO<inf>3</inf>aqueous solution can reach up to 154.8 mS cm<sup>&minus;1</sup>at 25 &deg;C, which is nearly two times of the maximum conductivity of 77.6 mS cm<sup>&minus;1</sup>for the 2.0 M Li<inf>2</inf>SO<inf>4</inf>aqueous solution under the identical testing conditions. Even at a concentration as high as 9.0 M, the absolute viscosity of the LiNO<inf>3</inf>aqueous solution is only 2.4, while that of the Li<inf>2</inf>SO<inf>4</inf>aqueous solution achieves 3.0 at the maximum concentration of 2.5 M. Additionally, 5.0 M LiNO<inf>3</inf>aqueous solution exhibits a wide electrochemical potential stability window from &minus;0.9 to 0.9 V (vs. SCE) at the AC electrode, giving rise to an operating cell voltage of 1.8 V, which is comparable to that of 2.0 M Li<inf>2</inf>SO<inf>4</inf>aqueous solution. Further, with the 5.0 M LiNO<inf>3</inf>aqueous solution as the electrolyte, the as-fabricated EDLC delivers an energy density up to 21.16 Wh Kg<sup>&minus;1</sup>at a power density of 100.09 W kg<sup>&minus;1</sup>, which is higher than 18.43 Wh Kg<sup>&minus;1</sup>for the EDLC with the 2.0 M Li<inf>2</inf>SO<inf>4</inf>aqueous electrolyte at the identical power density. Even though the power density reaches as high as 5970 W kg<sup>&minus;1</sup>, the energy density of the EDLC with the 5.0 M LiNO<inf>3</inf>aqueous electrolyte can still remain at 13.1 Wh Kg<sup>&minus;1</sup>, substantially higher than 8.71 Wh Kg<sup>&minus;1</sup>of the EDLC with the 2.0 M Li<inf>2</inf>SO<inf>4</inf>aqueous electrolyte at the same power density. Moreover, the EDLC with the 5.0 M LiNO<inf>3</inf>aqueous electrolyte also holds good cyclic stability. After 10000 charge&ndash;discharge cycles at a current density of 1 A g<sup>&minus;1</sup>and a cut-off voltage of 1.8 V, the capacity retention of this EDLC retains more than 90%. These results can render an insight to explore safe, eco-friendly, inexpensive and neutrally aqueous electrolytes for supercapacitors.<br/> &copy;2018 Elsevier Ltd
参考文献:
Abdulagatov IM, 2006, J CHEM THERMODYN, V38, P179, DOI 10.1016/j.jct.2005.04.017
Abdulagatov IM, 2005, FLUID PHASE EQUILIBR, V227, P57, DOI 10.1016/j.fluid.2004.10.028
Arulepp M, 2004, J POWER SOURCES, V133, P320, DOI 10.1016/j.jpowsour.2004.03.026
Beguin F, 2014, ADV MATER, V26, P2219, DOI 10.1002/adma.201304137
Boisset A, 2013, J PHYS CHEM C, V117, P7408, DOI 10.1021/jp3118488

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