Journal
CHEMICAL ENGINEERING JOURNAL
Volume 357, Issue -, Pages 458-462Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.09.099
Keywords
Sodium ion batteries; Sodium vanadium fluorophosphates; Polyvinyl; Rate capability; Cyclic stability
Categories
Funding
- National Natural Science Foundation of China [51704332]
- Natural Science Foundation of Hunan Province [2018JJ3669]
- National Postdoctoral Program for Innovative Talents [BX201700290]
- Innovation-Driven Project of Central South University [2018CX006]
- Collaborative Innovation centre of Manganese-Zinc-Vanadium Industrial Technology (2011 plan of Hunan province)
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To solve the problem of poor conductivity, monoclinic NaVPO4F with a uniform carbon coating layer is synthesized via a facile solution approach with assistance of polyvinyl pyrrolidone (PVP). On one hand, PVP acts as a surfactant, encapsulating the precursor and restraining the particle growth. On the other hand, PVP is used as carbon source, in-situ generating a uniform carbon coating layer on the surface of NaVPO4F particles. The obtained NaVPO4F/C composite shows much enhanced electronic conductivity of 4.2 x 10(-2) S cm(-1). As a result, the synthesized NaVPO4F/C cathode for sodium ion batteries demonstrates superior cyclic stability and rate capability, delivering a reversible capacity of 111 mAh g(-1) at 0.1 C, maintaining 81.8% capacity retention after 1000 cycles at 10 C and retaining a high capacity of 68 mAh g(-1) at 20 C.
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