TY  - JOUR
AU  - Jakes, Peter
AU  - Granwehr, Josef
AU  - Kungl, Hans
AU  - Eichel, Rüdiger-A.
TI  - Mixed 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
JO  - Zeitschrift für physikalische Chemie
VL  - 229
IS  - 9
SN  - 2196-7156
CY  - Berlin
PB  - De @Gruyter
M1  - FZJ-2015-06219
SP  - 1439-1450
PY  - 2015
AB  - Spinel-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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000363494500014
DO  - DOI:10.1515/zpch-2015-0618
UR  - https://juser.fz-juelich.de/record/256252
ER  -