Glutamic Acid Induced Proton Substitution of Sodium Vanadate Cathode Promotes High Performance in Aqueous Zinc‐Ion Batteries
Advanced energy materials(2024)
摘要
Lacking strategies to simultaneously address the narrow interlayer spacing, irreversible phase transitions, dissolution and electrical transport issues of vanadium oxides is restricting their application in aqueous zinc-ion batteries. Herein, to address these challenges concurrently, an organic-inorganic hybrid cathode is explored, HNaV6O164H2O-Glu (HNVO-Glu), through a guest material-mediated NVO synthesis strategy utilizing glutamic acid (Glu) to induce Na substituted by proton and enable crystal transformation of Na2V6O163H2O (NVO). Specially, Glu insertion kills three birds with one arrow: i) induces the formation of a structurally stable monoclinic HNaV6O164H2O phase by introducing H into the NVO framework, preventing structural phase change and collapse of NVO material; ii) acts as a pillar to expand the interlayer spacing, which improves the Zn2+ diffusion kinetics; moreover, the polar groups on the Glu surface weaken the electrostatic interaction between Zn2+ and the host materials, further enhancing the zinc-ionic transport rate; iii) enhances the electrical conductivity of HNVO by converting the p-type semiconductor into the n-type semiconductor structure. Consequently, the HNVO-Glu exhibits a high specific capacity (354.6 mAh g-1 at 1 A g-1), excellent Zn2+ diffusion capability (10-9 to 10-7 cm2 s-1) and outstanding cycling stability with a capacity retention of 87.2% after 12 000 cycles at 10 A g-1. Herein, an organic-inorganic hybrid cathode is explored, HNaV6O164H2O-Glu (HNVO-Glu), through a guest material-mediated NVO synthesis strategy utilizing glutamic acid to induce Na substituted by proton and enable crystal transformation of Na2V6O163H2O. Consequently, the HNVO-Glu exhibits a high specific capacity, excellent Zn2+ diffusion capability and outstanding cycling stability with a capacity retention of 87.2% after 12 000 cycles at 10 A g-1. image
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关键词
aqueous zinc-ion battery,co-intercalation,glutamic acid,in situ characterization,organic/inorganic hybrids cathode
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