46.
Here, LiY(WO
4)
2 nanotubes are prepared via a feasible electrospinning technique. This new anode material shows excellent electrochemical properties. The capacity loss of LiY(WO
4)
2 nanotubes is as low as 6.9% after 156 cycles, while bulk LiY(WO
4)
2 presents the capacity loss higher than 55.0%. Even after 600 long-life cycles, the capacity loss of the nanotubes is only 9%. It can be seen that the hollow structure with a rough surface and a porous morphology contributes to the improvement of electrochemical performance. Furthermore, online X-ray diffraction (XRD) method is firstly applied to understand the lithium ions insertion/extraction mechanism of LiY(WO
4)
2 nanotubes. It can be concluded that it is an asymmetrical two-phase reaction. A phase transformation from LiY(WO
4)
2 to Li
3Y(WO
4)
2 can be obviously seen from the in situ XRD during discharge process. While Li
2Y(WO
4)
2 appears as an intermediate phase with a reverse charge reaction. In addition, in situ XRD also demonstrates that LiY(WO
4)
2 nanotubes have surprised electrochemical reversibility. All the above results indicate that LiY(WO
4)
2 nanotubes can be expected to be anode candidate for rechargeable lithium ion batteries (LIBs).
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