Journal
RSC ADVANCES
Volume 6, Issue 49, Pages 43591-43597Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra04237f
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Funding
- National Basic Research Program of the Ministry of Science & Technology of China [2014CB848900]
- Science Fund for Creative Research Groups of NSFC [11321503]
- National Natural Science Foundation of China (NSFC) [11179001, 11275227, U1232131, 51222202, 11179004, 11374043]
- Fundamental Research Funds for Central Universities [2012QNQA4005, WK2310000035, WK2310000044]
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Na3V2(PO4)(3) (NVP) has been in the spotlight as a potential candidate of next generation batteries to overcome the limitation of lithium resources on Earth. Here a thin-layer graphene-encapsulated NVP composite (NVP/G) was synthesized by self-assembly of surface modified NVP and graphene oxide and then followed by reduction to compensate for the intrinsic low electronic conductivity of NVP and strengthen its structure stability. The as-synthesized hybrid composite as a cathode for sodium-ion batteries (SIBs) exhibits excellent high specific capacity and superior rate performance with discharge capacities of 115.2 mA h g(-1) at 0.2 C and 70.1 mA h g(-1) at 30 C, It also shows an excellent cycling stability with about 86.0% capacity retention at 5 C after 300 cycles. Ex situ X-ray absorption spectroscopy (XAS) characterization confirmes the local geometrical environment around vanadium is highly conserved during the sodiation/desodiation process, associated with an electrochemically active V3+/V4+ redox couple. Hence the as-prepared hybrid composite can be considered as a promising cathode material for high-rate SIBs, thanks to the effect interface interaction between NVP nanoparticle sand graphene films.
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