Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/138220
Title: CATION DOPING AND GRAPHENE EFFECTS ON NASICON-TYPE NA3V2(PO4)3 CATHODE FOR SODIUM-ION BATTERIES
Authors: YAP ZU QUAN, JEREMY
Keywords: Electrochemistry, Sodium-ion Batteries, Cathode, Sodium Vanadium Phosphate, Doping, Graphene
Issue Date: 29-Sep-2017
Source: YAP ZU QUAN, JEREMY (2017-09-29). CATION DOPING AND GRAPHENE EFFECTS ON NASICON-TYPE NA3V2(PO4)3 CATHODE FOR SODIUM-ION BATTERIES. ScholarBank@NUS Repository.
Abstract: NASICON-type Na3V2(PO4)3 (NVP) is a potentially viable cathode material in sodium-ion batteries. However, its poor electronic conductivity limits its rate and cycle performance. A co-modification strategy, comprising cation doping and graphene, was applied to augment the material’s sluggish charge transport kinetics. The NVP composites were synthesized via a hydrothermal-assisted sol-gel method at a design stoichiometry of Na3V2-xMx(PO4)3/C+RGO (where M = Fe3+ or Co2+; x = 0 – 0.15). The nanomaterials were characterized using XRD, SEM, TEM, EDS, XPS, and TGA. The optimized composition was ascertained by the merits of its electrochemical performance: Na3V1.90Fe0.10(PO4)3/C+RGO delivered the highest initial discharge capacity of 118.4 mAh g-1 at 0.1 C and recorded an impressive capacity retention of 88.7 % after 100 cycles at 20 C. The observed correlation between the improvements in the electrochemical properties and the change in cell volume suggest that the best configuration to the cell volume is to increase it conservatively.
URI: http://scholarbank.nus.edu.sg/handle/10635/138220
Appears in Collections:Master's Theses (Open)

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