Aqueous zinc-ion batteries(AZIBs)suffer from poor electrolyte/anode interfacial stability and severe performance degradation under low-temperature conditions.To address these issues,this study proposes natural okra po...Aqueous zinc-ion batteries(AZIBs)suffer from poor electrolyte/anode interfacial stability and severe performance degradation under low-temperature conditions.To address these issues,this study proposes natural okra polysaccharides(OPs)as an electrolyte additive for interfacial engineering,OPs,rich in polar functional groups,preferentially adsorb onto the Zn/electrolyte interface via strong dipole interactions,forming a robust protective layer.This layer promotes uniform Zn deposition,suppresses side reactions and corrosion,and enhances the hydrogen-bond network of the electrolyte,thereby reducing interfacial water activity and lowering the freezing point.As a result,the low-temperature stability and electrochemical reversibility of AZIBs are significantly improved.Zn‖Zn symmetric cells incorporating OPs exhibit exceptional cycling stability,maintaining reversible zinc plating/stripping for over 5000 h at 2 mA cm^(-2) and 1 mAh cm^(-2) and sustaining stable operation at-10℃for 1600 h under 1 mA cm^(-2)and 0.5 mAh cm^(-2),as well as for 300 h under 10 mA cm^(-2) and 10 mAh cm^(-2).Furthermore,full cells employing V_(2)O_(5) cathodes retain 83%of their capacity after 1000 cycles,confirming the practical applicability of OPs as a functio nal electrolyte additive.This work demonstrates the significant potential of OPs to overcome key limitations of AZIBs,particularly for low-temperature operation,offering a sustainable and cost-effective strategy for next-generation energy storage.展开更多
基金supported by the National Natural Science Foundation of China(22265007)the Guangxi Science and Technology Plan Project(GuikeAD25069100)+1 种基金the Guangdong Major Project of Basic Research(No.2023B0303000002)the High Level of Special Funds(No.G03034K00)。
文摘Aqueous zinc-ion batteries(AZIBs)suffer from poor electrolyte/anode interfacial stability and severe performance degradation under low-temperature conditions.To address these issues,this study proposes natural okra polysaccharides(OPs)as an electrolyte additive for interfacial engineering,OPs,rich in polar functional groups,preferentially adsorb onto the Zn/electrolyte interface via strong dipole interactions,forming a robust protective layer.This layer promotes uniform Zn deposition,suppresses side reactions and corrosion,and enhances the hydrogen-bond network of the electrolyte,thereby reducing interfacial water activity and lowering the freezing point.As a result,the low-temperature stability and electrochemical reversibility of AZIBs are significantly improved.Zn‖Zn symmetric cells incorporating OPs exhibit exceptional cycling stability,maintaining reversible zinc plating/stripping for over 5000 h at 2 mA cm^(-2) and 1 mAh cm^(-2) and sustaining stable operation at-10℃for 1600 h under 1 mA cm^(-2)and 0.5 mAh cm^(-2),as well as for 300 h under 10 mA cm^(-2) and 10 mAh cm^(-2).Furthermore,full cells employing V_(2)O_(5) cathodes retain 83%of their capacity after 1000 cycles,confirming the practical applicability of OPs as a functio nal electrolyte additive.This work demonstrates the significant potential of OPs to overcome key limitations of AZIBs,particularly for low-temperature operation,offering a sustainable and cost-effective strategy for next-generation energy storage.
