Stabilized Zn Anode Based on SO42– Trapping Ability and High Hydrogen Evolution Barrier. (24th May 2022)

• Record Type: Journal Article
• Authors: Chen, Aosai; Zhao, Chenyang; Guo, Zhikun; Lu, Xingyuan; Zhang, Jiachi; Liu, Nannan; Zhang, Yu; Zhang, Naiqing
• Is Part Of: Advanced functional materials. Volume 32:Number 32(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-24
• Subjects: molecular designs -- parasitic reactions -- rapid and large‐capacity cycles -- SO 42– receptors -- zinc ion batteries; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202203595
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Metallic zinc as a promising anode material of aqueous zinc ion batteries is always impeded by some irreversible issues, such as dendrite growth, hydrogen evolution, and parasitic reaction, which severely affect the cycling stability and coulombic efficiency. Herein, the membrane of SO4 2‐ receptors is constructed on the Zn anode (denoted SO4 2‐ receptors as SR). The SR acts as a sulfate ion receptor to capture SO4 2‐, the resulting negatively charged coating can effectively disperses Zn 2+ to promote uniform deposition and enhance Zn 2+ mobility to stabilize high‐current cycling, while the repulsion of free SO4 2‐ coupled with high Gibbs free energy for hydrogen evolution reaction (ΔGH*) of SR and SR‐SO4 2‐ can effectively suppress the formation of parasitic (ZnSO4 )·(Zn(OH)2 )3 ∙xH2 O. Benefiting from this versatility, Zn anode can achieve an average coulombic efficiency of over 99% and superior cycling performance (10 000 cycles for 10mA cm ‐2 and 450 cycles for 5 mAh cm ‐2 ). Meanwhile, Zn@SR/α‐MnO2 full battery can maintain 91.7% residual capacity after 900 cycles under 1.0 A g ‐1 . Abstract : An organic coating material SR that can bind SO4 2– is designed to stabilize the zinc plating. The negatively charged SR coating after binding SO4 2– (SR‐SO4 2– ) can regulate the transport behavior and distribution state of Zn 2+ and residual SO4 2–, coupled with the high ΔGH* of SR and SR‐SO4 2–, it can effectively suppress dendrites growth, hydrogen evolution, and parasitic reaction.