This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1016/j.jpowsour.2014.05.110 in citations.
Improving the rate capability of high voltage lithium-ion battery cathode material LiNi0.5Mn1.5O4 by ruthenium doping
Improving the rate capability of high voltage lithium-ion battery cathode material LiNi0.5Mn1.5O4 by ruthenium doping
The citric acid-assisted solegel method was used to produce the high-voltage cathodes LiNi0.5Mn1.5O4and LiNi0.4Ru0.05Mn1.5O4 at 800 C and 1000 C final calcination temperatures. High resolution powderdiffraction using synchrotron radiation, inductively coupled plasma e optical emission spectroscopy a...
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Personal Name(s): | Kiziltas-Yavuz, Nilüfer (Corresponding Author) |
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Bhaskar, Aiswarya / Dixon, Ditty / Yavuz, Murat / Nikolowski, Kristian / Lu, Li / Eichel, Rüdiger-A. / Ehrenberg, Helmut | |
Contributing Institute: |
Grundlagen der Elektrochemie; IEK-9 |
Published in: | Journal of power sources, 267 (2014) S. 533 - 541 |
Imprint: |
New York, NY [u.a.]
Elsevier
2014
|
DOI: |
10.1016/j.jpowsour.2014.05.110 |
Document Type: |
Journal Article |
Research Program: |
Fuel Cells Renewable Energies |
Publikationsportal JuSER |
The citric acid-assisted solegel method was used to produce the high-voltage cathodes LiNi0.5Mn1.5O4and LiNi0.4Ru0.05Mn1.5O4 at 800 C and 1000 C final calcination temperatures. High resolution powderdiffraction using synchrotron radiation, inductively coupled plasma e optical emission spectroscopy andscanning electron microscopy analyses were carried out to characterize the structure, chemicalcomposition and morphology. X-ray absorption spectroscopy studies were conducted to confirm Rudoping inside the spinel as well as to compare the oxidation states of transition metals. The formation ofan impurity LixNi1xO in LiNi0.5Mn1.5O4 powders annealed at high temperatures (T 800 C) can besuppressed by partial substitution of Ni2þ by Ru4þ ion. The LiNi0.4Ru0.05Mn1.5O4 powder synthesized at1000 C shows the highest performance regarding the rate capability and cycling stability. It has an initialcapacity of ~139 mAh g1 and capacity retention of 84% after 300 cycles at C/2 chargingedischarging ratebetween 3.5 and 5.0 V. The achievable discharge capacity at 20 C for a charging rate of C/2 is~136 mAh g1 (~98% of the capacity delivered at C/2). Since the electrode preparation plays a crucial roleon parameters like the rate capability, the influence of the mass loading of active materials in the cathodemixture is discussed.© 2014 Elsevier B.V. All rights reserved. |