Zinc-ion batteries(ZIBs)have garnered significant interest owing to their intrinsic safety,environmental compatibility,and low cost.However,nonuniform Zn deposition and parasitic side reactions during cycling lead to ...Zinc-ion batteries(ZIBs)have garnered significant interest owing to their intrinsic safety,environmental compatibility,and low cost.However,nonuniform Zn deposition and parasitic side reactions during cycling lead to rapid capacity decay and potential short-circuiting.To address these challenges,we developed a carboxymethyl cellulose-zinc(CMC-Zn)hydrogel electrolyte with self-release capability using a metal-ion crosslinking approach.The dynamically reversible CMC-Zn network continuously supplies active Zn^(2+)during cycling,compensating for electrode consumption in real time.Abundant carboxylate and hydroxyl groups regulate uniform zinc nucleation and growth,while the hydrogen-bonding network synergistically suppresses side reactions,as reflected by a low hydrogen-evolution potential(−0.281 V)and reduced corrosion current density(0.03 mA cm^(−2)).With these advantages,Zn||Zn symmetric cells achieve an ultralong lifespan of 6,400 h at 0.5 mA cm^(−2),and Zn||Cu half-cells deliver a stable coulombic efficiency of 99.1%over 4,200 cycles.In fullcell testing,self-released Zn^(2+)contributes 29%of the overall capacity,enabling Zn||PANI cells to retain 75%capacity after 2,000 cycles and exhibit a rate-performance recovery of 97.4%.A corresponding flexible ZIB maintains stable operation under various deformation conditions,highlighting the strong potential of CMC-Zn hydrogel electrolytes for next-generation flexible energy-storage devices.展开更多
基金supported by the China University of Petroleum(East China)Independent Innovation Research Program for Young Fund(Grant No.27RA2408006)China University of Petroleum(East China)College Students’Innovation and Entrepreneurship Training Program(Grant No.202506071CX).
文摘Zinc-ion batteries(ZIBs)have garnered significant interest owing to their intrinsic safety,environmental compatibility,and low cost.However,nonuniform Zn deposition and parasitic side reactions during cycling lead to rapid capacity decay and potential short-circuiting.To address these challenges,we developed a carboxymethyl cellulose-zinc(CMC-Zn)hydrogel electrolyte with self-release capability using a metal-ion crosslinking approach.The dynamically reversible CMC-Zn network continuously supplies active Zn^(2+)during cycling,compensating for electrode consumption in real time.Abundant carboxylate and hydroxyl groups regulate uniform zinc nucleation and growth,while the hydrogen-bonding network synergistically suppresses side reactions,as reflected by a low hydrogen-evolution potential(−0.281 V)and reduced corrosion current density(0.03 mA cm^(−2)).With these advantages,Zn||Zn symmetric cells achieve an ultralong lifespan of 6,400 h at 0.5 mA cm^(−2),and Zn||Cu half-cells deliver a stable coulombic efficiency of 99.1%over 4,200 cycles.In fullcell testing,self-released Zn^(2+)contributes 29%of the overall capacity,enabling Zn||PANI cells to retain 75%capacity after 2,000 cycles and exhibit a rate-performance recovery of 97.4%.A corresponding flexible ZIB maintains stable operation under various deformation conditions,highlighting the strong potential of CMC-Zn hydrogel electrolytes for next-generation flexible energy-storage devices.
