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000173120 0247_ $$2doi$$a10.1016/j.jpowsour.2014.08.133
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000173120 037__ $$aFZJ-2014-06533
000173120 041__ $$aEnglish
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000173120 1001_ $$0P:(DE-HGF)0$$aKleiner, Karin$$b0$$eCorresponding Author
000173120 245__ $$aFatigue of LiNi$_{0.8}$  Co$_{0.15}$Al$_{0.05}$O$_{2}$ in commercial Li ion batteries
000173120 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2015
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000173120 520__ $$aThe degradation of LiNi0.8Co0.15Al0.05O2 (LNCAO), a cathode material in lithium-ion-batteries, was studied using in situ powder diffraction and in situ Ni K edge X-ray absorption spectroscopy (XAS). The fatigued material was taken from a 7 Ah battery which was cycled for 34 weeks under defined durability conditions. Meanwhile, a cell was stored, as reference, under controlled conditions without electrochemical treatment. The fatigued LNCAO used in this study showed a capacity loss of 26% ± 9% compared to the non-cycled material. During charge and discharge the local and the overall structure of LNCAO was investigated by X-ray near edge structure (XANES) analysis, the extended X-ray absorption fine structure (EXAFS) analysis and by using Rietveld refinement of in situ powder diffraction patterns. Both powder diffraction and XAS revealed additional, rhombohedral phases which do not change with electrochemical cycling. Moreover, a phase with the lattice parameters of fully lithiated LNCAO was still present in the fatigued material at high potentials, while it was absent in the non-fatigued reference material. The coexistence of these phases is described by domains within the LNCAO particles, in correlation with the observed fatigue.
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000173120 7001_ $$0P:(DE-HGF)0$$aDixon, Ditty$$b1
000173120 7001_ $$0P:(DE-Juel1)156296$$aJakes, Peter$$b2$$ufzj
000173120 7001_ $$0P:(DE-HGF)0$$aMelke, Julia$$b3
000173120 7001_ $$0P:(DE-HGF)0$$aYavuz, Murat$$b4
000173120 7001_ $$0P:(DE-HGF)0$$aRoth, Christina$$b5
000173120 7001_ $$0P:(DE-HGF)0$$aNikolowski, Kristian$$b6
000173120 7001_ $$0P:(DE-HGF)0$$aLiebau, Verena$$b7
000173120 7001_ $$0P:(DE-HGF)0$$aEhrenberg, Helmut$$b8
000173120 773__ $$0PERI:(DE-600)1491915-1$$a10.1016/j.jpowsour.2014.08.133$$gVol. 273, p. 70 - 82$$p70 - 82$$tJournal of power sources$$v273$$x0378-7753$$y2015
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