A high rate and stable electrode consisting of a Na3V2O2X(PO4)2F3−2X–rGO composite with a cellulose binder for sodium-ion batteries. Issue 35 (19th April 2017)

• Record Type: Journal Article
• Authors: Kumar, P. Ramesh; Jung, Young Hwa; Ahad, Syed Abdul; Kim, Do Kyung
• Is Part Of: RSC advances. Volume 7:Issue 35(2017)
• Page Start: 21820
• Page End: 21826
• Publication Date: 2017-04-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra01047h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Na3 V2 O2 X (PO4 )2 F3−2 X –rGO with CMC binder shows the enhanced electrochemical performance; it exhibits 98% capacity retention at 0.1C rate over 250 cycles. Also, it remits discharge capacity of 98 mA h g −1 at 0.2C in a full cell with a NaTi2 (PO4 )3 –MWCNT. Abstract : Sodium ion batteries are a promising alternative to conventional lithium-ion batteries, mostly for large scale energy storage applications. In this paper, we report sodium vanadium oxy-fluorophosphate as a cathode material for sodium-ion batteries with 8.0 wt% reduced graphene oxide (rGO), synthesized via solid state reaction followed by a hydrothermal method. The newly reported Na3 V2 O2 X (PO4 )2 F3−2 X –rGO (NVOPF–rGO) composite with a hydrophilic carboxymethyl cellulose sodium (CMC-Na) binder shows enhanced rate performance and highly stable cyclability; it delivers a stable reversible capacity of 108 mA h g −1 in a sodium half-cell, and it exhibits 98% capacity retention at a 0.1C rate over 250 cycles. Furthermore, the as-prepared NVOPF–rGO composite exhibits discharge capacities of 98 mA h g −1 and 64 mA h g −1 at 0.2C and 2C rates, respectively, in a full-cell configuration with a NaTi2 (PO4 )3 –MWCNT (NTP–M) anode for 1000 cycles.