Zinc ion batteries are considered as potential energy storage devices due to their advantages of low-cost,high-safety,and high theoretical capacity.However,dendrite growth and chemical corrosion occurring on Zn anode ...Zinc ion batteries are considered as potential energy storage devices due to their advantages of low-cost,high-safety,and high theoretical capacity.However,dendrite growth and chemical corrosion occurring on Zn anode limit their commercialization.These problems can be tackled through the optimization of the electrolyte.However,the screening of electrolyte additives using normal electrochemical methods is time-consuming and labor-intensive.Herein,a fast and simple method based on the digital holography is developed.It can realize the in situ monitoring of electrode/electrolyte interface and provide direct information concerning ion concentration evolution of the diffusion layer.It is effective and time-saving in estimating the homogeneity of the deposition layer and predicting the tendency of dendrite growth,thus able to value the applicability of electrolyte additives.The feasibility of this method is further validated by the forecast and evaluation of thioacetamide additive.Based on systematic characterization,it is proved that the introduction of thioacetamide can not only regulate the interficial ion flux to induce dendrite-free Zn deposition,but also construct adsorption molecule layers to inhibit side reactions of Zn anode.Being easy to operate,capable of in situ observation,and able to endure harsh conditions,digital holography method will be a promising approach for the interfacial investigation of other battery systems.展开更多
With their excellent reliability and environmental friendliness,zinc-ion batteries(ZIBs)are regarded as potential energy storage technologies.Unfortunately,their poor cycling durability and low Coulombic effectiveness...With their excellent reliability and environmental friendliness,zinc-ion batteries(ZIBs)are regarded as potential energy storage technologies.Unfortunately,their poor cycling durability and low Coulombic effectiveness(CE),driven by dendritic growth and surface passivation on the Zn anode,severely restrict their commercialization.Herein,we describe the in situ construction of a Zn-rich polymeric solid–electrolyte interface(SEI)using poly-acrylic acid(PAA)as an electrolyte additive.On the one hand,the PAA SEI layer offers evenly distributed nucleation sites and promotes ion transport,hence suppressing dendrite growth.On the other hand,the SEI layer prevents direct contact between the Zn foil and the electrolyte,thus inhibiting side reactions.Additionally,the robust coordination of PAA with Zn^(2+)and the SEI layer's good adherence to the Zn foil provide long-term pro-tection to the Zn anode.As a result,symmetric cells and Zn/V_(2)O_(5)cells all deliver prolonged cycle life and superior electrochemical efficiency.展开更多
基金supported by the National Natural Science Foundation of China(No.22075115)Natural Science Foundation of Jiangsu Province(No.BK20211352)+2 种基金Joint Funds of the National Natural Science Foundation of China(No.U2141201)Natural Science Foundation(No.22KJA430005)of Jiangsu Education Committee of ChinaPostgraduate Research and Practice Innovation Program of Jiangsu Normal University(No.2021XKT0296).
文摘Zinc ion batteries are considered as potential energy storage devices due to their advantages of low-cost,high-safety,and high theoretical capacity.However,dendrite growth and chemical corrosion occurring on Zn anode limit their commercialization.These problems can be tackled through the optimization of the electrolyte.However,the screening of electrolyte additives using normal electrochemical methods is time-consuming and labor-intensive.Herein,a fast and simple method based on the digital holography is developed.It can realize the in situ monitoring of electrode/electrolyte interface and provide direct information concerning ion concentration evolution of the diffusion layer.It is effective and time-saving in estimating the homogeneity of the deposition layer and predicting the tendency of dendrite growth,thus able to value the applicability of electrolyte additives.The feasibility of this method is further validated by the forecast and evaluation of thioacetamide additive.Based on systematic characterization,it is proved that the introduction of thioacetamide can not only regulate the interficial ion flux to induce dendrite-free Zn deposition,but also construct adsorption molecule layers to inhibit side reactions of Zn anode.Being easy to operate,capable of in situ observation,and able to endure harsh conditions,digital holography method will be a promising approach for the interfacial investigation of other battery systems.
基金supported by grants from the National Natural Science Foundation of China(Grant No.22222902,52202245)Natural Science Foundation of Jiangsu Province(Grant No.BK20211352)+1 种基金Natural Science Foundation of Jiangsu Education Committee of China(Grant No.22KJA430005,22KJB430004)Postgraduate Research and Practice Innovation Program of Jiangsu Normal University(No.2021XKT0296).
文摘With their excellent reliability and environmental friendliness,zinc-ion batteries(ZIBs)are regarded as potential energy storage technologies.Unfortunately,their poor cycling durability and low Coulombic effectiveness(CE),driven by dendritic growth and surface passivation on the Zn anode,severely restrict their commercialization.Herein,we describe the in situ construction of a Zn-rich polymeric solid–electrolyte interface(SEI)using poly-acrylic acid(PAA)as an electrolyte additive.On the one hand,the PAA SEI layer offers evenly distributed nucleation sites and promotes ion transport,hence suppressing dendrite growth.On the other hand,the SEI layer prevents direct contact between the Zn foil and the electrolyte,thus inhibiting side reactions.Additionally,the robust coordination of PAA with Zn^(2+)and the SEI layer's good adherence to the Zn foil provide long-term pro-tection to the Zn anode.As a result,symmetric cells and Zn/V_(2)O_(5)cells all deliver prolonged cycle life and superior electrochemical efficiency.
