![]() ![]() Based on the comprehensive advantages of zinc anode, much attention has been paid to the new cathode materials with fast and durable Zn 2+ storage, and fundamental insights of zinc ion storage mechanism in cathode materials. standard hydrogen electrode), superior stability in water, and nontoxicity. Among various aqueous rechargeable batteries, rechargeable aqueous zinc-ion batteries (ZIBs) are receiving significant attention owing to certain benefits from zinc anode: high theoretical capacity (820 mAh/g), low redox potential (−0.76 V vs. 1–10 mS/cm), which endows the aqueous battery with superior rate capability and power density. In addition, aqueous electrolytes can deliver much higher ionic conductivity ( ca. Aqueous rechargeable divalent-ion batteries ( e.g., Zn 2+, Mg 2+ and Ca 2+) have been intensively investigated because of their low cost, high safety, and environmental friendliness. But the safety issues caused by flammable properties of the organic electrolyte, as well as the huge cost of lithium resources are still the most critical concerns to be solved. The findings reveal a new perspective of zinc ion storage mechanism for Fe 2V 4O 13, which may also be applicable to other vanadate cathodes, providing a new direction for the investigation and design of zinc-ion batteries.īiomass-based flexible quasi-solid-state batteryĬurrently, Lithium-ion batteries (LIBs) have been successfully used in the field of electronics market such as mobile phones and computers owing to the high energy density. Moreover, the assembled Fe 2V 4O 13//Zn flexible quasi-solid-state battery also exhibits a relatively high mechanical strength and good cycling stability. As a result, the Fe 2V 4O 13 cathode delivers a high discharge capacity of 380 mAh/g at 0.2 A/g, and stable cyclic performance up to 1000 cycles at 10 A/g in the operating window of 0.2–1.6 V with 2 mol/L Zn(CF 3SO 3) 2 aqueous solution. Intriguingly, two zinc ion storage mechanism can be observed simultaneously for the Fe 2V 4O 13 electrode, i.e., classical intercalation/deintercalation storage mechanism in the tunnel structure of Fe 2V 4O 13, and reversible phase transformation from ferric vanadate to zinc vanadate, which is verified by combined studies using various in-situ and ex-situ techniques. Herein, open-structured ferric vanadate (Fe 2V 4O 13) has been developed as cathode material for aqueous zinc-ion batteries. However, the relationship between structure change of cathode and the zinc ion storage mechanism is still complex and challenging. Rechargeable aqueous zinc-ion batteries have attracted extensive interest because of low cost and high safety. ![]()
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