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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Cross-linked Na2VTi(PO4)(3)@C hierarchical nanofibers as high-performance bi-functional electrodes for symmetric aqueous rechargeable sodium batteries
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Cross-linked Na2VTi(PO4)(3)@C hierarchical nanofibers as high-performance bi-functional electrodes for symmetric aqueous rechargeable sodium batteries

机译：交联Na2VTI（PO4）（3）@C层次纳米纤维作为对称含水可充电钠电池的高性能双功能电极

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摘要

Significant interest has been devoted to the design and fabrication of flexible electronic devices owing to their immense potential in modern society. Constructing freestanding electrodes with superior electrochemical performance and excellent mechanical durability is the key to the development of high-performance energy storage devices. In this study, we introduce a new cross-linked Na2VTi(PO4)(3)/porous carbon nanofiber, which is employed as a self-supported bi-functional electrode in aqueous sodium ion batteries. The sodium intercalation mechanism of the Na2VTi(PO4)(3)/C electrode in an aqueous electrolyte is investigated. The reversible phase transformations and the valence state change of Na2VTi(PO4)(3) in both high- and low-potential ranges (i.e. 0-0.6 V vs. Ag/AgCl; -1-0 V vs. Ag/AgCl) demonstrate its reliability as both the anode and the cathode in the aqueous electrolyte. Favored by the highly porous architecture and aligned cross-linked arrangement, the Na2VTi(PO4)(3)/C nanofiber achieves fast kinetics and good mechanical characteristics. Both result in its superior high-rate properties, good cycling durability and high structural stability. Moreover, a symmetric aqueous rechargeable sodium battery is prepared by assembling two cross-arranged Na2VTi(PO4)(3)/C nanofiber electrodes. The cell exhibits a flat potential plateau of similar to 1.2 V and is capable of high-rate long-term cycling. It retains 83% of the capacity after six hundred cycles at alternate 40 and 4C. Therefore, this work not only introduces a novel symmetric aqueous sodium ion system, but also provides a highly efficient architecture for flexible high-performance electrodes. More importantly, it provides a new clue to construct energy storage devices with a simple configuration, low-cost and superior properties.
机译：由于其在现代社会中的巨大潜力，灵活的电子设备的设计和制造致力于设计和制造。构建具有卓越电化学性能的独立电极，优异的机械耐用性是高性能储能装置开发的关键。在这项研究中，我们介绍了一种新的交联Na2VTI（PO4）/多孔碳纳米纤维，其是在钠离子电池水溶液中作为自支撑的双官能电极。研究了Na2VTI（PO4）（3）/ C电极在水性电解质中的钠嵌入机制。高电位范围内的可逆相变性和Na2VTI（PO4）（3）的价态变化（即0-0.6V与Ag / AgCl; -1-0V与Ag / AgCl）展示其可靠性作为阳极和水性电解质中的阴极。由高度多孔的结构和对齐的交联布置青睐，Na2VTI（PO4）（3）/ C纳米纤维实现快速动力学和良好的机械特性。两者都导致其优异的高速率性能，良好的循环耐久性和高结构稳定性。此外，通过组装两个交叉布置的Na2VTI（PO 4）（3）/ C纳米纤维电极来制备对称含水的可再充电钠电池。该细胞表现出平坦的电位高原，其类似于1.2V，并且能够高速速率的长期循环。在交替40和4C的六百周期后，它保留了83％的容量。因此，这项工作不仅引入了一种新的对称水性钠离子系统，而且还提供了一种高效的柔性高性能电极的架构。更重要的是，它提供了一种新的线索，用于构造具有简单配置，低成本和优越的特性的能量存储设备。

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    Dong Jing; Zhang Guoming; Wang Xiaoguang; Zhang Sen; Deng Chao;

  • 作者单位

    Harbin Normal Univ Key Lab Photon &

    Elect Bandgap Mat Minist Educ Key Lab Photochem Biomat &

    Energy Storage Mat Harbin 150025 Heilongjiang Peoples R China;

    Harbin Normal Univ Key Lab Photon &

    Elect Bandgap Mat Minist Educ Key Lab Photochem Biomat &

    Energy Storage Mat Harbin 150025 Heilongjiang Peoples R China;

    Harbin Normal Univ Key Lab Photon &

    Elect Bandgap Mat Minist Educ Key Lab Photochem Biomat &

    Energy Storage Mat Harbin 150025 Heilongjiang Peoples R China;

    Harbin Engn Univ Key Lab Superlight Mat &

    Surface Technol Minist Educ Coll Mat Sci &

    Chem Engn Harbin 150001 Heilongjiang Peoples R China;

    Harbin Normal Univ Key Lab Photon &

    Elect Bandgap Mat Minist Educ Key Lab Photochem Biomat &

    Energy Storage Mat Harbin 150025 Heilongjiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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