N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries

Sun, Ke, Hu, Yuebo, Zhang, Xudong, San Hui, Kwan, Zhang, Keliang, Xu, Guogang, Ma, Jingyun and He, Wen (2020) N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries. Electrochimica Acta, 335. ISSN 0013-4686

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Abstract

The development of sodium-ion batteries with high power density is highly challenging yet critically important in many applications. Herein, we develop sodium-ion batteries with ultrahigh power density by using N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres as a cathode. A higher working potential of 3.4 V, superior rate capability (93 mA h g−1 at 10C, 81 mA h g−1 at 30C) as well as stable cycling performance (72.9% capacity retention at 10C after 1000 cycle) are simultaneously achieved. Very impressively, it can deliver pseudocapacitive behavior and a practical energy density of 317 W h kg−1 at a power density of 194 W kg−1, which also remains 73.5 W h kg−1 even at an ultrahigh power density of 12600 W kg−1. The superior performances can be ascribed to the hybrid-porous microsphere structure, which provide favorable kinetics for bath electron and Na+, large cathode-electrolyte contact area, as well as robust structural integrity. This design provides a promising pathway for developing low-cost sodium-ion batteries with high energy density as well as high power density.

Item Type: Article
Uncontrolled Keywords: high energy density,hybrid-porous microspheres,soft double-carbon-coated,na v (po ),ultrahigh power density,storage,electrode material,na3v2(po4)(3),cathode material,lithium-ion,cycling stability,hollow spheres,rate capability,electrochemical performance,life,rational design,chemical engineering(all),electrochemistry ,/dk/atira/pure/subjectarea/asjc/1500
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Depositing User: LivePure Connector
Date Deposited: 16 Jan 2020 05:12
Last Modified: 11 Jul 2020 23:54
URI: https://ueaeprints.uea.ac.uk/id/eprint/73656
DOI: 10.1016/j.electacta.2020.135680

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