Boosting the active sites and kinetics of VO2 by Mn pre-intercalated and PVP modified nanostructure to improve the cycle stability for aqueous zinc batteries
CHEMICAL ENGINEERING JOURNAL(2022)
摘要
Aqueous zinc ion batteries (ZIBs) have attracted extensive attention because of its high cost-performance and high safety. This study reports a structural engineering method that embeds Mn ions as pillars into the VO2 layered structure, and improves the morphology through polyvinylpyrrolidone (PVP) to increase the specific surface area, thereby obtaining MnVO2-PVP. Increasing the number of electrochemically active sites allows it to have faster ion diffusion kinetics and better long-term cycle stability. The synthesized MnVO2-PVP with nano prism and nanosheet composite structure shows a remarkable capacity of 470.2 mAh g(-1) at 0.5 A g(-1), and also has excellent cycle stability at 5000 times at 10 A g(-1). The capacity after cycling is 176.5 mAh g(-1), with high energy density (179 W h kg(-1)) and power density (7000 W kg(-1)). The synthesis method and marvelous performance of MnVO2-PVP can lay a foundation for the improvement of the synthesis method of ZIBs cathode materials in the future.
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关键词
Mn pillars,PVP modified,Nanoprism and nanosheet composite structure,Aqueous zinc-ion battery
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