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000154081 1001_ $$0P:(DE-HGF)0$$aKiziltas-Yavuz, Nilüfer$$b0$$eCorresponding Author
000154081 245__ $$aImproving the rate capability of high voltage lithium-ion battery cathode material LiNi0.5Mn1.5O4 by ruthenium doping
000154081 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2014
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000154081 520__ $$aThe citric acid-assisted solegel method was used to produce the high-voltage cathodes LiNi0.5Mn1.5O4and LiNi0.4Ru0.05Mn1.5O4 at 800 C and 1000 C final calcination temperatures. High resolution powderdiffraction using synchrotron radiation, inductively coupled plasma e optical emission spectroscopy andscanning electron microscopy analyses were carried out to characterize the structure, chemicalcomposition and morphology. X-ray absorption spectroscopy studies were conducted to confirm Rudoping inside the spinel as well as to compare the oxidation states of transition metals. The formation ofan impurity LixNi1xO in LiNi0.5Mn1.5O4 powders annealed at high temperatures (T  800 C) can besuppressed by partial substitution of Ni2þ by Ru4þ ion. The LiNi0.4Ru0.05Mn1.5O4 powder synthesized at1000 C shows the highest performance regarding the rate capability and cycling stability. It has an initialcapacity of ~139 mAh g1 and capacity retention of 84% after 300 cycles at C/2 chargingedischarging ratebetween 3.5 and 5.0 V. The achievable discharge capacity at 20 C for a charging rate of C/2 is~136 mAh g1 (~98% of the capacity delivered at C/2). Since the electrode preparation plays a crucial roleon parameters like the rate capability, the influence of the mass loading of active materials in the cathodemixture is discussed.© 2014 Elsevier B.V. All rights reserved.
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000154081 7001_ $$0P:(DE-HGF)0$$aBhaskar, Aiswarya$$b1
000154081 7001_ $$0P:(DE-HGF)0$$aDixon, Ditty$$b2
000154081 7001_ $$0P:(DE-HGF)0$$aYavuz, Murat$$b3
000154081 7001_ $$0P:(DE-HGF)0$$aNikolowski, Kristian$$b4
000154081 7001_ $$0P:(DE-HGF)0$$aLu, Li$$b5
000154081 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b6$$ufzj
000154081 7001_ $$0P:(DE-HGF)0$$aEhrenberg, Helmut$$b7
000154081 773__ $$0PERI:(DE-600)1491915-1$$a10.1016/j.jpowsour.2014.05.110$$gVol. 267, p. 533 - 541$$p533 - 541$$tJournal of power sources$$v267$$x0378-7753$$y2014
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