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Polyoxometalates (POMs) with multiple redox active sites have been reported as charge sponge for lithium-ion batteries (LIBs). Herein, we for the first time introduce a polyoxovanadate (POV) ionic crystals with macrocations, [Ni(Phen)3][ClV14O34]Cl (NiV14, Phen = 1,10-phenanthroline), as an anode material for LIBs. The existence of macrocation [Ni(Phen)3]2+ stabilizes the open tunnels inside NiV14. The NiV14 electrode exhibits superior rate capabilities (1083 mAh·g−1 at 100 mA·g−1 and 384 mAh·g−1 at 2000 mA·g−1) due to the rapid capacitive dominated contribution and high Li+ ions diffusion coefficients (3.3 × 10−12 cm−2·s−1), and it delivers a remarkable cycling stability with a Coulombic efficiency of 99.7% after 1000 cycles at 2000 mA·g−1. Such performance can be attributed to the stable structure of NiV14 and the highly reversible valence changes of vanadium during the charge/discharge processes, which are revealed by a combination of in situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption fine structure (XAFS) measurements. This work not only demonstrates that NiV14 with open tunnels stabilized by macrocation is a promising anode material for high performance LIBs, but also provides important references for the rational design of POMs electrode materials in advanced energy storage systems.
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