Affiliation:
1. Liaoning Key Laboratory of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery College of Light Industry and Chemical Engineering Dalian Polytechnic University Dalian 116034 China
2. State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China
3. Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China
Abstract
AbstractAqueous Zinc–Iodine (Zn–I2) batteries are promising candidates as energy storage system because of their high safety and low cost, but their application is hindered by the dendrite growth, the hydrogen evolution reaction (HER) and corrosion, the shuttle and self‐discharge effect of I3− at electrode/electrolyte interface. Inspired by self‐recognition mechanism of Zn supplement for human body, a self‐recognition layer (SR) is in situ constructed on Zn surface through the coordination of chondroitin sulfate (CHS) molecules with Zn2+ ions and Zn metal, which can induce the uniform Zn2+ deposition via the self‐recognition of Zn2+, suppress the HER and corrosion via physical shielding, as well as restrain the self‐discharge effect of I3− ions via electrostatic repulsion. The in situ SR affords the highly reversible plating/stripping for 9000 h. Remarkably, Zn–I2 full batteries with SR achieve long cycling‐life of 16 000 cycles, which is verified by pouch cell with stable charge/discharge capacity of ≈130 mAh g−1 for 200 cycles. This bionic self‐recognition methodology opens novel avenues to design the optimal electrode/electrolyte interface for high‐performance Zn–I2 batteries.