Journal
POWDER TECHNOLOGY
Volume 364, Issue -, Pages 70-77Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2020.01.055
Keywords
Sodium ion battery; Na3V2(PO4)(3); Carbon encapsulation; Chlorine doping; Sodium storage performance
Categories
Funding
- National Natural Science Foundation of China [21606081, 51703061]
- Introduce Talents Fund of Hunan Agricultural University [13YJ01]
- General Project of Hunan Education Department [18C0174]
- Science Fund Opening Project of Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization [18KFXM07]
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NASICON-structured Na3V2(PO4)(3) possessing three-dimensional channel for sodiumion migration demonstrates promising prospect as cathode for sodiumion battery due to good thermal stability and large theoretical capacity. Herein, carbon encapsulation and chlorine doping are employed to improve sodium storage performances of Na3V2(PO4)(3) through sol-gel method. Carbon-encapsulated chlorine-doped Na3V2(PO4)(3) composites reveal raised electrochemical performance. Among composites, Na3V2(PO4)(2.9)Cl-0.3@C (NVP@C/Cl-30) with proper chlorine exhibits the best performance. NVP@C/Cl-30 delivers the discharge capacity of 104.2, 86.4, 52.2 mAh g(-1) at 40, 1000, 4000 mA g(-1), severally, much higher than those of chlorine-undoped composite (NVP@C, 74.2, 46.4, 21.1 mAh g(-1)). Moreover, NVP@C/Cl-30 demonstrates excellent cycling performance (capacity retention: 93.0%, 500 cycles, 800 mA g(-1)). Outstanding performances is attributed to nanostructure from sol-gel route and synergetic effect of carbon encapsulation and chlorine doping for Na3V2(PO4)(3). Nanostructure can shorten migration pathway of sodiumion. Carbon encapsulation and chlorine doping raise electrical and ionic conductivity, respectively. (C) 2020 Elsevier B.V. All rights reserved.
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