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Vertically constructed monolithic electrodes for sodium ion batteries: toward low tortuosity and high energy density

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Abstract

Nanomaterials for battery applications are strongly appealing to the industrial community, yet conventional electrode fabrication by employing a slurry paste restricts the potential performances of nanoengineered materials, particularly with commercial-level thickness and high mass loading. Here, physical vapor deposition (PVD) prepared monolithic electrodes composed of 40 μm-thick anisotropic WS2 vertical arrays on Al foil with a mass loading of 17.5 mg cm−2, and several sparsely inserted nanometre-thick carbon layers are reported. The monolithic anode shows an ultra-fast Na-ion diffusivity of 2.05 × 10−10 cm2 s−1, which is two orders of magnitude faster than that of the anode prepared from a slurry paste. As a sodium-ion battery (SIB) anode, the monolithic electrode achieves prominent areal and volumetric capacities of 5.57 mA h cm−2 and 1.39 A h cm−3, respectively, at a current density of 100 mA g−1 with less than 20% decay during 300 cycles. Furthermore, a SIB full cell composed of the monolithic anode and a Na2V3(PO4)3/C cathode can provide a reversible capacity around 125 mA h g−1 at 2C with an output voltage of 1.77 V, which demonstrates its potential for further development.

Graphical abstract: Vertically constructed monolithic electrodes for sodium ion batteries: toward low tortuosity and high energy density

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Publication details

The article was received on 02 Sep 2019, accepted on 27 Oct 2019 and first published on 30 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA09644B
J. Mater. Chem. A, 2019, Advance Article

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    Vertically constructed monolithic electrodes for sodium ion batteries: toward low tortuosity and high energy density

    P. Li, Y. Wang, J. Y. Jeong, X. Gao, K. Zhang, A. Neville, S. Xu and J. H. Park, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA09644B

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