Hauptseite > Publikationsdatenbank > Self-standing NASICON-type electrodes with high mass loading for fast-cycling all-phosphate sodium-ion batteries > print

001     851832
005     20240712112842.0
024 7 _ |a 10.1039/C8TA07313A
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024 7 _ |a 2050-7496
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041 _ _ |a English
082 _ _ |a 540
100 1 _ |a Yu, Shicheng
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245 _ _ |a Self-standing NASICON-type electrodes with high mass loading for fast-cycling all-phosphate sodium-ion batteries
260 _ _ |a London [u.a.]
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520 _ _ |a A scalable strategy has been realized to produce anodic NaTi2(PO4)3 and cathodic Na3V2(PO4)3 supported on carbon nanotube fabrics (CNFs) as binder-free, metal current collector-free, carbon additive-free, bendable and self-standing electrodes for sodium-ion batteries. The NaTi2(PO4)3 and Na3V2(PO4)3 particles are not only anchored on the surface of the CNFs but also uniformly embedded in the framework of the CNFs via a two-step coating process followed by annealing treatment. In the relevant voltage range, the high electrochemical stability of the 3D electron conduction network of carbon nanotubes in the self-standing electrodes was confirmed by in situ Raman spectroscopy. Both electrodes possessed a thickness of around 130 μm and a high mass loading of greater than 7.5 mg cm−2 and exhibited a high specific capacity, high rate capability and long lifespan in both half cells and all-phosphate full cells. The all-phosphate full cells delivered more than half of their theoretical capacity even at a high current rate of 100C. Besides, a capacity retention of 75.6% over 4000 cycles at a rate of 20C was achieved. The reason for the capacity fade in the full cell during long-term cycling was the formation of a solid electrolyte interphase layer, as was indicated by XRD, TEM and in operando NMR measurements. Furthermore, the promising practical possibilities of the electrodes and all-phosphate sodium-ion battery were demonstrated by a prototype flexible pouch cell and by stacking multiple electrodes in a laboratory-scale battery
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700 1 _ |a Liu, Zigeng
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700 1 _ |a Tempel, Hermann
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700 1 _ |a Kungl, Hans
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700 1 _ |a Eichel, Rüdiger-A.
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773 _ _ |a 10.1039/C8TA07313A
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