Driven by the burgeoning demand for wearable electronics,the development of inherently safe,mechanically compliant,and high-energy–density power sources has become imperative.Flexible aqueous Zn ions batteries(FAZIBs...Driven by the burgeoning demand for wearable electronics,the development of inherently safe,mechanically compliant,and high-energy–density power sources has become imperative.Flexible aqueous Zn ions batteries(FAZIBs)are hampered by Zn dendrite formation and hydrogen evolution,underscoring the urgent need for highly stable and novel flexible energy-storage devices.Although flexible aqueous cobalt-ion batteries(FACIBs)employing cobalt-salt aqueous electrolytes exhibit high theoretical capacity,they suffer from two limitations:the rapid dissolution of cathode active substances in the aqueous electrolyte and the risk of liquid electrolyte leakage under mechanical deformation.Here,we report the first realization of an ultra-stable,quasi-solid-state and mechanically FACIBs.Polyacrylamide(PAM)containing CoSO_(4) serves as the quasi-solid electrolyte,while cobalt hexacyanoferrate(CoHCF)functions as the cathode active material,and metallic cobalt foil as the flexible anode.This configuration simultaneously eliminates electrolyte leakage and suppresses the dissolution of CoHCF due to the common-ion effect of Co^(2+).Consequently,the fabricated FACIBs exhibit extraordinary cycling durability and remarkable mechanical robustness(95.9%retention after 500 bending cycles).Thus,this work provides a new way for designing ultra-stable energy storage devices for wearable electronics.展开更多
基金supported by the National Natural Science Foundation of China(52402040 and 52561160149)National Key R&D Program of China(2024YFE0109200)+7 种基金Fundamental Research Funds for the Central Universities(2024300440)Open Project(M37033)of National Laboratory of Solid State Microstructures,Nanjing UniversityGuangdong Basic and Applied Basic Research Foundation(2025A1515011098)Shenzhen Science and Technology Program(JCYJ20250604190115021)Key Research Project of Universities in Henan Province(25A430006)Henan Province University Students Innovation Training Project(202510479001)Funded by the Training Program for Young Backbone Teachers in Higher Education Institutions of Henan Province(Prof.Chaowei Li)Science and Technology Research Project of Henan Province(242102240076)。
文摘Driven by the burgeoning demand for wearable electronics,the development of inherently safe,mechanically compliant,and high-energy–density power sources has become imperative.Flexible aqueous Zn ions batteries(FAZIBs)are hampered by Zn dendrite formation and hydrogen evolution,underscoring the urgent need for highly stable and novel flexible energy-storage devices.Although flexible aqueous cobalt-ion batteries(FACIBs)employing cobalt-salt aqueous electrolytes exhibit high theoretical capacity,they suffer from two limitations:the rapid dissolution of cathode active substances in the aqueous electrolyte and the risk of liquid electrolyte leakage under mechanical deformation.Here,we report the first realization of an ultra-stable,quasi-solid-state and mechanically FACIBs.Polyacrylamide(PAM)containing CoSO_(4) serves as the quasi-solid electrolyte,while cobalt hexacyanoferrate(CoHCF)functions as the cathode active material,and metallic cobalt foil as the flexible anode.This configuration simultaneously eliminates electrolyte leakage and suppresses the dissolution of CoHCF due to the common-ion effect of Co^(2+).Consequently,the fabricated FACIBs exhibit extraordinary cycling durability and remarkable mechanical robustness(95.9%retention after 500 bending cycles).Thus,this work provides a new way for designing ultra-stable energy storage devices for wearable electronics.
