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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigations on different strategies towards improving the electrochemical properties of Na2VTi (PO4)(3) for symmetrical sodium-ion batteries
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Investigations on different strategies towards improving the electrochemical properties of Na2VTi (PO4)(3) for symmetrical sodium-ion batteries

机译：对对称钠离子电池改善Na2VTI（PO4）（3）电化学性能的不同策略的研究

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摘要

In this study, we investigate the roles of chelating agents and composite formers, such as reduced graphene oxide (r-GO), on the electrochemical properties of sodium titanium-vanadium phosphate (NVTP) for their final application in symmetrical sodium-ion cells. It is observed that NVTP synthesized using citric acid as reducing-cum-chelating agent has better site substitution of Ti as compared to ascorbic acid. X-Ray diffraction results reveal that NVTP crystallizes in the R (3) over barc spacegroup (NASICON). EDS-STEM results reveal a homogeneous site substitution of Ti in the material synthesized using citric acid. The material is able to deliver similar to 46 mAhg(-1) at 187.5 mAg(-1) (similar to 3C) consistently without fading, and without significant specific capacity changes at lower current rates. To improve its electrochemical performance at higher current rates, composite of NVTP with r-GO is formed in-situ during synthesis. From Hall measurements, it is observed that r-GO increases the electronic conductivity by over one order of magnitude, which allows the composite to sustain up to 10C rate without significant drop in specific capacity. However, the specific capacity is observed to be lower compared to the ones observed for NVTP without r-GO. Ultimately, a symmetrical full cell is constructed using the best results obtained from the above strategies, which delivers similar to 40 mAhg(-1) at similar to 3C rate without fading for 100 cycles. (C) 2020 Elsevier B.V. All rights reserved.
机译：在这项研究中，我们研究了螯合剂和复合成型剂（如还原氧化石墨烯（r-GO））对钛钒磷酸钠（NVTP）电化学性能的作用，以最终应用于对称钠离子电池。结果表明，与抗坏血酸相比，柠檬酸作为还原螯合剂合成的NVTP具有更好的Ti位取代。X射线衍射结果表明，NVTP在barc空间群（NASICON）上方的R（3）中结晶。EDS-STEM结果显示，在使用柠檬酸合成的材料中，Ti发生了均匀的位置取代。该材料能够在187.5 mAg（-1）（类似于3C）下持续输送类似于46 mAg（-1）的电流，而不会褪色，在较低的电流速率下也不会发生显著的比容量变化。为了提高其在较高电流速率下的电化学性能，在合成过程中原位形成了NVTP与r-GO的复合材料。根据霍尔测量，可以观察到r-GO将电子导电率提高了一个数量级以上，这使得复合材料能够维持高达10C的速率，而比容量不会显著下降。然而，与无r-GO的NVTP相比，观察到的比容量更低。最终，使用从上述策略中获得的最佳结果构建对称的全电池，其以类似于3C的速率提供类似于40 mAh（-1）的电流，而不会衰减100个周期。（C） 2020爱思唯尔B.V.版权所有。

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