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000809434 1001_ $$0P:(DE-Juel1)158085$$aDellen, Christian$$b0$$eCorresponding author$$ufzj
000809434 245__ $$aTime-of-flight secondary ion mass spectrometry study of lithium intercalation process in LiCoO$_2$ thin film
000809434 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2016
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000809434 520__ $$aA detailed time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis of the lithium de-/intercalation in thin films of the insertion cathode material lithium cobalt oxide is presented. The LiCoO2 (LCO) thin films are deposited by radio frequency magnetron sputtering at 600 °C, having a (003) preferred orientation after the deposition. The thin electrode films are cycled with liquid electrolyte against lithium metal, showing 80-86% extractable capacities. After disassembling the cells, the depth resolved elemental distribution in the LCO is investigated by ToF-SIMS and glow discharge optical emission spectroscopy. Both techniques show a stepwise lithium distribution in charged state, leading to a lithium depleted layer close to the surface. In combination with the electrochemical results, the qualitative comparison of the different lithium depth profiles yields a reversible lithium extraction in the depleted area below the stability limit for bulk materials of LCO. For bulk LCO, a phase change normally occurs when the lithium concentration in LixCoO2 is lower than x=0.5. As a possible cause for the inhibition of the phase change, the preferred orientation and thus pinning of the crystal structure of the film by the substrate is proposed.
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000809434 7001_ $$0P:(DE-Juel1)162280$$aGehrke, Hans-Gregor$$b1$$ufzj
000809434 7001_ $$0P:(DE-Juel1)139534$$aMöller, Sören$$b2$$ufzj
000809434 7001_ $$0P:(DE-Juel1)156244$$aTsai, Chih-Long$$b3$$ufzj
000809434 7001_ $$0P:(DE-Juel1)133840$$aBreuer, Uwe$$b4$$ufzj
000809434 7001_ $$0P:(DE-Juel1)129580$$aUhlenbruck, Sven$$b5$$ufzj
000809434 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b6$$ufzj
000809434 7001_ $$0P:(DE-Juel1)145623$$aFinsterbusch, Martin$$b7$$ufzj
000809434 7001_ $$0P:(DE-Juel1)129591$$aBram, Martin$$b8$$ufzj
000809434 773__ $$0PERI:(DE-600)1491915-1$$a10.1016/j.jpowsour.2016.04.084$$p241-247$$tJournal of power sources$$v321$$x0378-7753$$y2016
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