Wearable electronic devices such as Apple Watches, Samsung bracelets, and Sony VR headsets are gradually becoming a part of life because of the great convenience they bring. With the rapid rise of the consumer market, wearable devices will inevitably need to further develop flexible energy storage systems. As an ideal energy supply for wearable devices, fiber batteries have become more and more popular in recent years. They allow mechanical deformation in all dimensions and can be integrated into wearable electronic textiles.

      Recently, the research group of Professor Zhao Jiupeng of Harbin Institute of Technology published a research paper titled Assembling Free-Standing and Aligned Tungstate/MXene Fiber for Flexible Lithium and Sodium-Ion Batteries with Efficient Pseudocapacitive Energy Storage in the well-known academic journal Energy Storage Materials. A one-dimensional linear electrode is designed and assembled, and it has good performance in lithium-ion sodium-ion batteries.

Figure 1. Tungstate/MXene composite fiber synthesis process schematic and AFM characterization.

Figure 2. SEM, XPS, Zeta potential and mechanical properties test.

Figure 3. Electrochemical test of tungstate/MXene composite fiber electrodes assembled into a one-dimensional linear lithium-ion battery.

Figure 4. The electrochemical test of tungstate/MXene composite fiber electrodes assembled into a one-dimensional linear sodium ion battery.

       In this paper, a novel, independently arranged tungstate/MXene fiber is developed by wet spinning technology for flexible lithium and sodium ion batteries. Among them, the two-dimensional tungstate nanosheets are combined with MXene to build a two-dimensional heterostructure in the fiber, so that it has a relatively good performance in both mechanical properties and electrochemical properties.
Literature link:
https://doi.org/10.1016/j.ensm.2020.06.018
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