首页|High donor-number and low content electrolyte additive for stabilizing zinc metal anode
High donor-number and low content electrolyte additive for stabilizing zinc metal anode
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The aqueous zinc ion batteries(AZIBs)are thought as promising competitors for electrochemical energy storage,though their wide application is curbed by the uncontrollable dendrite growth and gas evolution side reactions.Herein,to stabilize both zinc anodes and water molecules,we developed a modified elec-trolyte by adding a trace amount of N,N-diethylformanmide(DEF)into the ZnSO4 electrolyte for the first time in zinc ion batteries.The effectiveness of DEF is predicted by the comparison of donor number and its preferential adsorption behavior on the zinc anode is further demonstrated by several spectroscopy characterizations,electrochemical methods,and molecular dynamics simulation.The modified elec-trolyte with 5％v.t.DEF content can ensure a stable cycling life longer than 3400 h of Zn||Zn symmetric cells and an ultra-reversible Zn stripping/plating process with a high coulombic efficiency of 99.7％.The Zn||VO2 full cell maintains a capacity retention of 83.5％and a 104 mA h g-1 mass capacity after 1000 cycles.This work provides insights into the role of interfacial adsorption behavior and the donor number of additive molecules in designing low-content and effective aqueous electrolytes.
Aqueous zinc ion batteriesZinc anodeElectrolyte additivesDonor numberZinc dendrites
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key Laboratory of Urban Water Resource and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China
Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China
Institute of Energy Material Science,University of Shanghai for Science and Technology,Shanghai 200093,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Heilongjiang ProvinceOpen Project of the State Key Laboratory of Urban Water Resource and EnvironmentFundamental Research Funds for the Central Universities
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