Journal
ELECTROCHIMICA ACTA
Volume 335, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.135680
Keywords
N-doped hard/soft double-carbon-coated; Na3V2(PO4)(3); Hybrid-porous microspheres; High energy density; Ultrahigh power density
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Funding
- National Natural Science Foundation of China [51672139, 51472127, 51272144, 51702177]
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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. (C) 2020 Elsevier Ltd. All rights reserved.
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