Aqueous zinc ion batteries(ZIBs)feature high theoretical capacity,low cost,and high safety,but they suffer from moderate reversibility arising from electrolyte decomposition,Zn corrosion/passivation,and dendrite growt...Aqueous zinc ion batteries(ZIBs)feature high theoretical capacity,low cost,and high safety,but they suffer from moderate reversibility arising from electrolyte decomposition,Zn corrosion/passivation,and dendrite growth.To address this issue,an effective strategy is to construct a functional solid electrolyte interface(SEI)in situ.However,this is substantially challenging owing to the severe hydrogen evolution reaction(HER)and a lack of substances that can be decomposed to form SEI in the aqueous electrolytes.Herein,we propose the fabrication of a stable SEI in situ via a synergistic electrochemical reductionchemical precipitation approach.By chemically capturing the hydroxide ions(OH-)from HER,fatty acid methyl ester ethoxylate(FMEE),as an aqueous electrolyte additive,undergoes ester group hydrolysis following by a combination with Zn^(2+)to form insoluble fatty acid-zinc,enabling intelligent growth of a SEI on the Zn anode surface.As a result,the enhanced Zn anode exhibits a prolonged cycling life of up to 2700 h at 1 m A/cm^(2)and 1 m Ah/cm^(2).The Zn-V_(2)O_(5)full cell with the designed electrolyte demonstrates excellent rate capability and significantly improved cycling stability.This study presents a simple and practical strategy for in-situ formation of SEI in aqueous electrolytes,advancing the development of high-performance aqueous batteries.展开更多
基金supported by the National Natural Science Foundation of China(No.22309211)the Guangdong Basic and Applied Basic Research Foundation(No.2024A1515010158)+1 种基金the Guangzhou Science and Technology Programme(No.SL2023A04J01514)the Lanzhou Chengguan District Science and Technology Plan Project(No.2022-rc-4)。
文摘Aqueous zinc ion batteries(ZIBs)feature high theoretical capacity,low cost,and high safety,but they suffer from moderate reversibility arising from electrolyte decomposition,Zn corrosion/passivation,and dendrite growth.To address this issue,an effective strategy is to construct a functional solid electrolyte interface(SEI)in situ.However,this is substantially challenging owing to the severe hydrogen evolution reaction(HER)and a lack of substances that can be decomposed to form SEI in the aqueous electrolytes.Herein,we propose the fabrication of a stable SEI in situ via a synergistic electrochemical reductionchemical precipitation approach.By chemically capturing the hydroxide ions(OH-)from HER,fatty acid methyl ester ethoxylate(FMEE),as an aqueous electrolyte additive,undergoes ester group hydrolysis following by a combination with Zn^(2+)to form insoluble fatty acid-zinc,enabling intelligent growth of a SEI on the Zn anode surface.As a result,the enhanced Zn anode exhibits a prolonged cycling life of up to 2700 h at 1 m A/cm^(2)and 1 m Ah/cm^(2).The Zn-V_(2)O_(5)full cell with the designed electrolyte demonstrates excellent rate capability and significantly improved cycling stability.This study presents a simple and practical strategy for in-situ formation of SEI in aqueous electrolytes,advancing the development of high-performance aqueous batteries.
