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GO induced preparation of flake-shaped Na3V2(PO4)3@rGO as high-rate and long-life cathodes for sodium-ion batteries

Abstract

NASICON-type Na3V2(PO4)3 (NVP) has attracted considerable attention as the cathode material for sodium-ion batteries (SIBs) due to three-dimensional open frameworks and high power density. However, the low electronic conductivity severely limits its reversible capacity and rate capability. Here, two-dimensional graphene oxide (GO) as a desired self-template was rationally utilized to inductively prepare flake-shaped NVP@rGO (reduced GO) composites via a facile sol-gel route and solid-state reaction. The highly conductive graphene network offers fast electron transfer while the rGO induced lamellar structure benefits for Na+ migration during redox reactions. As expected, the as-prepared NVP@rGO electrode exhibited excellent rate capability (large reversible capacity of ~80 mAh g−1 even at 100 C, charge/discharge only in 36 s) and superior cycling stability (71% capacity retention after 10000 cycles). Importantly, this proposed strategy can be readily extended to prepare other-type cathode and anode materials with flake-shaped structure for advanced SIBs.

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Publication details

The article was received on 09 Sep 2017, accepted on 09 Nov 2017 and first published on 10 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA07943E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    GO induced preparation of flake-shaped Na3V2(PO4)3@rGO as high-rate and long-life cathodes for sodium-ion batteries

    F. Li, Y. Zhu, J. Sheng, L. Yang, Y. Zhang and Z. Zhou, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07943E

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