Toward High Power-High Energy Sodium Cathodes: A Case Study of Bicontinuous Ordered Network of 3D Porous Na3 (VO)2 (PO4 )2 F/rGO with Pseudocapacitance Effect

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Zhibo ZhangChangbao Zhu

Abstract

Developing high power-high energy electrochemical energy storage systems is an ultimate goal in the energy storage field, which is even more difficult but significant for low-cost sodium ion batteries. Here, fluoride is successfully prepared by the electrostatic spray deposition (ESD) technique, which greatly expands the application scope of ESD. A two-step strategy (solvothermal plus ESD method) is proposed to construct a bicontinuous ordered network of 3D porous Na3 (VO)2 (PO4 )2 F/reduced graphene oxide (NVOPF/rGO). This two-step strategy makes sure that NVOPF can be prepared by ESD, since it avoids the loss of F element during synthesis. The obtained NVOPF particles are as small as 15 nm, and the carbon content is only 3.5% in the final nanocomposite. Such a bicontinuous ordered network and small size of electroactive particles lead to the significant contribution of the pseudocapacitance effect to sodium storage, resulting in real high power-high energy sodium cathodes. The cathode exhibits excellent rate capability and cycling stability, whose rate performance is one of the best ever reported in both half cells and full cells. Moreover, this work provides a general and promising strategy for developing high power-high ene...Continue Reading

References

Nov 20, 2001·Nature·J M Tarascon, M Armand
May 4, 2005·Nature Materials·Antonino Salvatore AricòWalter van Schalkwijk
Mar 23, 2011·Nature Nanotechnology·Huigang ZhangPaul V Braun
Apr 16, 2013·Nature Materials·Veronica AugustynBruce Dunn
Jun 15, 2013·Advanced Materials·Yongji GongPulickel M Ajayan
Apr 23, 2015·Advanced Materials·Kai ZhangJun Chen
Dec 16, 2017·Science·Changbao ZhuJoachim Maier

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