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000256252 1001_ $$0P:(DE-Juel1)156296$$aJakes, Peter$$b0$$ufzj
000256252 245__ $$aMixed Ionic–Electronic Conducting Li4Ti5O12 as Anode Material for Lithium Ion Batteries with Enhanced Rate Capability – Impact of Oxygen Non-Stoichiometry and Aliovalent Mg2+-Doping Studied by Electron Paramagnetic Resonance
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000256252 520__ $$aSpinel-type Li4Ti5O12 is an attractive anode material for lithium-ion battery applications owing to its high specific energy and almost vanishing mechanical strain upon Li-(de)intercalation. The impact of oxygen non-stoichiometry and aliovalent Mg-doping on the defect chemistry of Li4Ti5O12 has been characterized by quantitative electron paramagnetic resonance (EPR) spectroscopy. The results obtained demonstrate that the Mg2+-ions are amphoterically incorporated at the here studied concentrations on both lithium (MgLi•) and titanium (Mg′′Ti) sites. Mg2+-doping thus simultaneously results in the formation of donor (MgLi•) and acceptor (Mg′′Ti) centers. Furthermore, upon both oxygen deficiency and Mg2+-doping, the concentration of `polaronic'-type Ti3+-states is increased, accounting for the enhanced electronic conductivity.
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000256252 7001_ $$0P:(DE-Juel1)162401$$aGranwehr, Josef$$b1$$ufzj
000256252 7001_ $$0P:(DE-Juel1)157700$$aKungl, Hans$$b2$$ufzj
000256252 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b3$$eCorresponding author$$ufzj
000256252 773__ $$0PERI:(DE-600)2020854-6$$a10.1515/zpch-2015-0618$$gVol. 229, no. 9$$n9$$p1439-1450$$tZeitschrift für physikalische Chemie$$v229$$x2196-7156$$y2015
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