Building Ultra-Stable and Low-Polarization Composite Zn Anode Interface via Hydrated Polyzwitterionic Electrolyte Construction

Nano-Micro Letters

Guozhong Cao¹  Yifang Zhang²  Guozhao Fang³  Shuquan Liang³  Simin Chai³  Qiong He³  Shuang Zhou³  Yue Zhong³  Zhi Chang³  Anqiang Pan³  Miao Zhou³ 

[1] Department of Materials Science and Engineering, University of Washington;Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City;School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University;

关键词: Quasi-solid electrolyte interface;    Polyzwitterionic hydrogel electrolytes;    High performance;    Manganese dioxides;    Zinc metal anodes;   

DOI  :  10.1007/s40820-022-00835-3

来源: DOAJ

【 摘 要 】

Abstract Aqueous zinc metal batteries are noted for their cost-effectiveness, safety and environmental friendliness. However, the water-induced notorious issues such as continuous electrolyte decomposition and uneven Zn electrochemical deposition remarkably restrict the development of the long-life zinc metal batteries. In this study, zwitterionic sulfobetaine is introduced to copolymerize with acrylamide in zinc perchlorate (Zn(ClO4)2) solution. The designed gel framework with hydrophilic and charged groups can firmly anchor water molecules and construct ion migration channels to accelerate ion transport. The in situ generated hybrid interface, which is composed of the organic functionalized outer layer and inorganic Cl− containing inner layer, can synergically lower the mass transfer overpotential, reduce water-related side reactions and lead to uniform Zn deposition. Such a novel electrolyte configuration enables Zn//Zn cells with an ultra-long cycling life of over 3000 h and a low polarization potential (~ 0.03 V) and Zn//Cu cells with high Coulombic efficiency of 99.18% for 1000 cycles. Full cells matched with MnO2 cathodes delivered laudable cycling stability and impressive shelving ability. Besides, the flexible quasi-solid-state batteries which are equipped with the anti-vandalism ability (such as cutting, hammering and soaking) can successfully power the LED simultaneously. Such a safe, processable and durable hydrogel promises significant application potential for long-life flexible electronic devices.

【 授权许可】

Unknown