Water-Lubricated Intercalation in V2O5•nH2O for High-Capacity and High-Rate Aqueous Rechargeable Zinc Batteries
Water-Lubricated Intercalation in V2O5•nH2O for High-Capacity and High-Rate Aqueous Rechargeable Zinc Batteries
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DOI：
10.1002/adma.201703725
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发表时间：
2018-01-04
影响因子：
29.4
通讯作者：
Yang, Jihui
中科院分区：
文献类型：
--
作者：
Yan, Mengyu;He, Pan;Yang, Jihui
低成本、环境友好型水锌电池具有大规模储能的巨大潜力，但锌离子在正极材料中的嵌入具有挑战性和复杂性。本文证明了结构水对Zn2+嵌入双分子层V(2)O(5)nH(2)O的关键作用。结果表明，h2o溶剂化后的Zn2+有效电荷大大减少，从而减少了与V2O5骨架的静电相互作用，有效地促进了V2O5的扩散。得益于“润滑”效应，水锌电池在0.3 a g（-1）时显示出约144 Wh kg（-1）的比能量。同时，它可以在6.4 kW kg（-1）的高功率密度下（基于阴极和200% Zn的阳极）保持90 Wh kg（-1）的能量密度，使其成为高性能，低成本，安全和环保的储能设备的有希望的候选人。
Low-cost, environment-friendly aqueous Zn batteries have great potential for large-scale energy storage, but the intercalation of zinc ions in the cathode materials is challenging and complex. Herein, the critical role of structural H2O on Zn2+ intercalation into bilayer V(2)O(5)nH(2)O is demonstrated. The results suggest that the H2O-solvated Zn2+ possesses largely reduced effective charge and thus reduced electrostatic interactions with the V2O5 framework, effectively promoting its diffusion. Benefited from the "lubricating" effect, the aqueous Zn battery shows a specific energy of approximate to 144 Wh kg(-1) at 0.3 A g(-1). Meanwhile, it can maintain an energy density of 90 Wh kg(-1) at a high power density of 6.4 kW kg(-1) (based on the cathode and 200% Zn anode), making it a promising candidate for high-performance, low-cost, safe, and environment-friendly energy-storage devices.