Influence of carbon polymorphism towards improved sodium storage properties of Na₃V₂O_2x (PO₄)₂F_3-2x

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• 作者：P. Ramesh Kumar ; Young Hwa Jung ; Do Kyung Kim
• 关键词：Sodium ion ; Sodium battery ; Vanadium ; Oxy ; fluorophosphate ; Phosphate ; carbon composite ; Polymorphism reduced ; Graphene oxide ; electrochemical properties
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：21
• 期：1
• 页码：223-232
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1433-0768
• 卷排序：21

文摘

The effects of 10 wt.% super P carbon, multiwalled carbon nanotubes (MWCNTs), and reduced graphene oxide (rGO) on particles size and electrochemical properties of Na₃V₂O_2x(PO₄)₂F_3-2x cathode material were studied. Among these three carbon polymorphs, using MWCNT in composite is effective to obtain low particle size and enhanced electrochemical properties of Na₃V₂O_2x(PO₄)₂F_3-2x. While using rGO to make the composite, the particle size becomes quite big, leading a smaller surface contact area with the electrolytes and thereby resulting in poor cyclability. Na₃V₂O_2x(PO₄)₂F_3-2x-MWCNT composite shows a high capacity of 98 mAh g−1at 0.1 C rate for 100 cycles, and further, it exhibits a stable capacity of 89 mAh g−1 at 0.2 C rate vs. NaTi₂(PO₄)₃-MWCNT in full cell configuration.