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Boosting the ultrastable Li storage performance in electron-sponge like polyoxovanadates by constructing inorganic 3D structure

Abstract

Polyoxometalates as an electron sponge, which process multielectron redox reactions and as a fast ionic conductor, show great potentials as promising electrode materials for next-generation lithium ion batteries (LIBs). However, there are still some fundamental issues which should be conquered before their applications such as what is the stable structure feature with reversible Li+ ions insertion/desertion. In this work, polyoxovanadates (POVs) based materials of K4Na2V10O28∙nH2O (KNaV10) and Mg2(NH4)2V10O28∙nH2O (MgV10), have been prepared and used as electrode material for Li+ ions reservoir. The 10-core polyoxovanadate demonstrates as anionic building blocks and the 3D extended structure have been smartly tuned by counter cations. For MgV10, a 1D tunnel with the size about 3 Å 10 Å formed along a axis by Mg2+ ions and [V10O28]6- polyanions. The MgV10 shows a higher capacity, cycling stability, and rate performance than that of KNaV10 without tunnels. The capacity of MgV10 is about 160 mAh g-1 at a high discharge rate of 250 mA g-1, while it is only 118 mAh g-1 for KNaV10. Even after 60 discharge/charge cycles at 50 mA g-1, it displayed a capacity of 180 mAh g-1. The 1D tunnel in MgV10 facilitates the Li+ ions transport and provides spatial Li storage sites, which promotes the electrochemical performance in LIBs. Moreover, the Mg2+ ions kept stable during battery cycling and promoted the 3D structure stability. This work demonstrates promising guidelines for the structure design of POVs based materials for Li storage.

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Publication details

The article was received on 19 Sep 2017, accepted on 12 Oct 2017 and first published on 13 Oct 2017


Article type: Research Article
DOI: 10.1039/C7QI00581D
Citation: Inorg. Chem. Front., 2017, Accepted Manuscript
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    Boosting the ultrastable Li storage performance in electron-sponge like polyoxovanadates by constructing inorganic 3D structure

    S. Lu, Y. Lv, W. Ma, X. Lei, R. Zhang, H. Liu and X. Liu, Inorg. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QI00581D

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