Journal Article

FZJ-2014-03483

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Improving the rate capability of high voltage lithium-ion battery cathode material LiNi0.5Mn1.5O4 by ruthenium doping

Kiziltas-Yavuz, N. (Corresponding Author) ; Bhaskar, A. ; Dixon, D. ; Yavuz, M. ; Nikolowski, K. ; Lu, L. ; Eichel, R.-A.FZJ* ; Ehrenberg, H.

2014
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jpowsour.2014.05.110

Abstract: 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.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 152 - Renewable Energies (POF2-152) (POF2-152)
2. 123 - Fuel Cells (POF2-123) (POF2-123)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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