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Na3V2(PO4)3/C Nanocomposite As Cathode Material for Sodium Ion Batteries
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fang, Yongjin Ai, Xinping Yang, Hanxi Cao, Yuliang |
| Copyright Year | 2014 |
| Abstract | Sodium ion batteries are now act ively pursued as the most attractive alternative to Li-ion batteries for largescale energy storage, because of their potential advantages of low cost, environmental benign ity and widespread availability of sodium resources. Therefore, it is a great challenge to explore new anode and cathode materials and optimize their performance to realize their high redox capacity for reversible Na-ion storage. Na3V2(PO4)3 as a cathode material showed the most promising electrochemical performance. 3 In this study, we explored a new method to synthesize the Na3V2(PO4)3/C nanocomposite, and investigated the electrochemical performances of the Na3V2(PO4)3/C nanocomposite in Na cells. The Na3 V2(PO4)3/C cathode material was synthesized by a simple mechanochemical reaction. V2 O5, NH4H2PO4, Na2CO3, oxalic acid and appropriate sucrose were put into a ball-milling vial with some ethanol. Then the mixture was mixed by high-energy ball milling for 2 h under Ar. The mixing precursor was dried and sintered for 8h at 800°C in Ar atmosphere to yield the Na3 V2(PO4)3/C composites. The Na3 V2(PO4)3/C material had been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and trans mission electron microscopy (TEM). The electrochemical measurements were based on cyclic voltammetry (CV) and galvanostatic technics. CV test was performed with a powder microelectrode at a scan rate of 0.1 mV s (Fig. 1). A pair of very symmetric redox bands with their anodic and cathodic peak currents at 3.41 V and 3.29 V can be observed, ascribable to the V/V redox couple. Fig. 2 shows the charge/discharge curves of the Na3V2(PO4)3/C cathode at a current rate of 20 mA g, it has a pair of flat p lateaus which are similar to LiFePO4. The initial discharge capacity was 106 mAh g, indicated that 1.8 Na can be reversibly inserted during the first discharge. As shown in Fig. 3, the Na3 V2(PO4)3/C material exh ibited decent cycling performance. A reversib le capacity of 95 mAh g -1 was retained throughout 50 cycles, showing good cycling performance. Further results about the electrochemical and structural propert ies of the electrode materials will be exposed and discussed in the meeting. |
| Starting Page | 145 |
| Ending Page | 145 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1149/ma2014-03/2/145 |
| Alternate Webpage(s) | https://ecs.confex.com/data/abstract/ecs/ecee2014/Paper_32725_abstract_12672_0.pdf |
| Alternate Webpage(s) | https://doi.org/10.1149/ma2014-03%2F2%2F145 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
