Effect of Surface Treatment of Stainless Steel Foils in High‐Performance Aqueous Zinc‐Ion Battery

Stainless steel foil, as the most commonly used current collector of aqueous zinc‐ion battery cathode, has the advantages of low cost, good conductivity, good flexibility, lightweight, and so on. However, as a current collector, stainless steel foil still faces a series of challenges, such as easy s...

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Bibliographic Details
Published in:Energy technology (Weinheim, Germany) Germany), 2022-06, Vol.10 (6), p.n/a
Main Authors: Li, Chao, Cai, Kunpeng, Liang, LiHeng, Dong, Jianxia, Liu, Xuhui, Cao, Ning, Shao, Qingguo, Zang, Xiaobei
Format: Article
Language:English
Subjects:
aqueous zinc-ion batteries
Battery cycles
Cathodes
Chemical etching
Conductivity
Contact resistance
current collectors
Electrochemical analysis
Electrochemistry
Ferric chloride
Manganese dioxide
Metal foils
physical grinding
Specific capacity
Stainless steel
stainless steel foils
Stainless steels
Surface treatment
Zinc
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Summary:Stainless steel foil, as the most commonly used current collector of aqueous zinc‐ion battery cathode, has the advantages of low cost, good conductivity, good flexibility, lightweight, and so on. However, as a current collector, stainless steel foil still faces a series of challenges, such as easy shedding of active materials and large contact resistance. In this work, the surface of stainless steel foil is modified by physical grinding and chemical etching, and the influence of surface morphology of stainless steel foil on battery performance is investigated. The results show that the stainless steel foil treated with 0.2 m FeCl3 + 0.1 m HCl etching solution for 1 min has the best electrochemical performance, and its maximum discharge specific capacity is 2.14 times that of the original stainless steel foil. In addition, the assembled Zn–MnO2 battery has good cycle stability and excellent rate performance, which can be attributed to the moderate roughness, effective contact area, and excellent conductivity of the modified stainless steel foil current collector. Surface treatment of current collector in zinc‐ion battery can improve the contact area, anchoring effect, and mechanical engagement between stainless steel foil and MnO2 particles and ultimately enlarge the electrochemical performance.
ISSN:2194-4288
2194-4296
DOI:10.1002/ente.202200150