%0 Journal Article
%A Yu, Shicheng
%A Liu, Zigeng
%A Tempel, Hermann
%A Kungl, Hans
%A Eichel, Rüdiger-A.
%T Self-standing NASICON-type electrodes with high mass loading for fast-cycling all-phosphate sodium-ion batteries
%J Journal of materials chemistry / A
%V 6
%@ 2050-7496
%C London [u.a.]
%I RSC
%M FZJ-2018-05332
%P 18304-18317
%D 2018
%X 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
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000448340100048
%R 10.1039/C8TA07313A
%U https://juser.fz-juelich.de/record/851832