标题：N-doped hard soft double-carbon-coated Na3V2(PO4)(3) hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries
作者：Sun, Ke; Hu, Yuebo; Zhang, Xudong; Hui, Kwan San; Zhang, Keliang; Xu, Guogang; Ma, Jingyun; He, Wen
作者机构：[Sun, Ke; Hu, Yuebo; Zhang, Xudong; Zhang, Keliang; Ma, Jingyun; He, Wen] Qilu Univ Technol, Shandong Acad Sci, Coll Mat Sci & Engn, Jinan 250353, Peo 更多
通讯作者：Zhang, XD;He, W;Hui, KS
通讯作者地址：[Zhang, XD; He, W]Qilu Univ Technol, Shandong Acad Sci, Coll Mat Sci & Engn, Jinan 250353, Peoples R China;[Hui, KS]UEA, Sch Engn, Energy & Environm L 更多
关键词：N-doped hard/soft double-carbon-coated; Na3V2(PO4)(3); Hybrid-porous; microspheres; High energy density; Ultrahigh power density
摘要：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.