Polymer Chain-Guided Ion Transport in Aqueous Electrolytes of Zn-Ion Batteries

Yan Wu; Tian Zhang; Lina ChenZhaohua ZhuLukuan ChengShuai GuZhiqiang LiZhongqiu TongHui LiYifan LiZhouguang LuWenjun ZhangChun Sing Lee

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Polymer Chain-Guided Ion Transport in Aqueous Electrolytes of Zn-Ion Batteries

机译：Polymer Chain-Guided Ion Transport in Aqueous Electrolytes of Zn-Ion Batteries

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As a promising candidate for next-generation energy storage devices, Znmetal battery excels with their good safety, high specific capacity, andeconomic attractiveness. However, it still suffers from a narrowelectrochemical window, notorious dendrite formation, and sluggish Zn iontransfer. Aqueous electrolyte engineering has been regarded as an effectiveway to improve these. It is shown that by adding sodium polystyrenesulfonate (PSS) polymers into a dilute 1 M Zn(OTf)_2 aqueous electrolyte,compact water shells with stronger hydrogen bonding and more orderedstructures are formed around the polymer chains. As a result, a fast transportchannel to the zinc ions is provided. The PSS chains also protect the zincelectrode from directly contacting the water molecules and thus suppresswater decomposition. With these merits, a Zn//Cu cell demonstrates a highcoulombic efficiency of ≈99 after 1500 h cycling. Meanwhile, a record-highcumulative Zn plating capacity of 10 000 mA h cm~(?2) is obtained using aZnZn cell. In addition, the Zn//C@V_2O_5 full cell achieves almost 100capacity retention after 1000 cycles. This work provides a new strategy fordesigning advanced electrolyte systems excelling in ion transport kinetics.

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来源
《Advanced energy materials》 |2023年第29期|2300719.1-2300719.11|共11页
作者
Yan Wu; Tian Zhang; Lina ChenZhaohua ZhuLukuan ChengShuai GuZhiqiang LiZhongqiu TongHui LiYifan LiZhouguang LuWenjun ZhangChun Sing Lee;
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Department of Chemistry, Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong Kong Tat Chee Avenue, Kowloon999077, Hong Kong;

School of Materials Science and Engineering Harbin Institute of Technology Shenzhen518055, P. R. China;

Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055, P. R. ChinaKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering Shandong University Jinan250061, P. R. ChinaSchool of Environmental and Municipal Engineering Qingdao University of Technology Qingdao266033, P. R. China;

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aqueous electrolytes; aqueous zinc metal batteries; improved ion transport kinetics; sodium polystyrene sulfonate;

Polymer Chain-Guided Ion Transport in Aqueous Electrolytes of Zn-Ion Batteries

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