Mn-substituted spinel Li4Ti5O12 materials studied by multifrequency EPR spectroscopy

Kaftelen, Hülya; Tuncer, Mustafa; Tu, Suyan; Repp, Sergei; Göçmez, Hasan; Thomann, Ralf; Weber, Stefan; Erdem, Emre

doi:10.1039/c3ta11590a

Cited by 79 publications

(46 citation statements)

References 62 publications

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“…As reported in previous reports, the presence of Ti 3+ could increase the electronic conductivity of LTO, leading to an improved electrochemical performance of LTO [19,[25][26][27]. The distinct colors of the two samples shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 62%

“…Subsequently, Yi et al [16] could create more oxygen vacancies as charge compensation [16,17]. These two factors are in favor of the ionic and the electronic conductivity of LTO, respectively [19,20]. Zhang et al [17] previously synthesized Ce 3+ -doped LTO using a sol-gel method, in which the precursors were heated in air and the doped sample (x=0.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

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Enhanced lithium storage capability of Li 4 Ti 5 O 12 anode material with low content Ce modification

Chen

Liu

et al. 2017

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 62%

Section: A N U S C R I P Tmentioning

confidence: 99%

Enhanced lithium storage capability of Li 4 Ti 5 O 12 anode material with low content Ce modification

Chen

Liu

et al. 2017

Journal of Alloys and Compounds

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“…Furthermore, the hyperfine structure of the latter resonance peak observed at room temperature (a av $ 95 G, g av $ 2, Fig. 10a) was characteristic of the insertion of some Mn(II) ions inside the distorted TiO 2 anatase lattice [46,67]. However, both the fast disappearance of these two major components in perpendicular mode at high temperature (Fig.…”

Section: Epr Characterizationmentioning

confidence: 88%

“…Two major peaks (resonances) are clearly observed at T ¼70 K. The broader one was attributed to Mn(IV) species with strong interactions between them, i.e. Mn in a cluster type environment [65][66][67][68]. In turn, the narrower peak was attributed to isolated Mn(IV), localized at the outer surface of the TiO 2 support.…”

Section: Epr Characterizationmentioning

confidence: 98%

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Schmit¹,

Bois²,

Chiriac³

et al. 2015

Journal of Solid State Chemistry

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SSCI-VIDE+CARE:CDFA+FSC:MBE:CDSInternational audienceManganese oxides supported on mesoporous titanium oxides were synthesized via a sol-gel route using block copolymer self-assembly. The oxides were characterized by X-ray diffraction, infrared spectroscopy, thermal analyses, nitrogen adsorption/desorption, electron microscopy and electronic paramagnetic resonance. A mesoporous anatase containing amorphous manganese oxide particles could be obtained with a 0.2 Mn:Ti molar ratio. At higher manganese loading (0.5 Mn:Ti molar ratio), segregation of crystalline manganese oxide occurred. The influence of block copolymer and manganese salt on the oxide structure was discussed. The evolution of the textural and structural characteristics of the materials upon hydrothermal treatment was also investigated. (C) 2014 Elsevier Inc. All rights reserved

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“…To elucidate the exact occupying site of the dopant ions in Li 4 Ti 5 O 12 , especially for Li substitution, is extremely important for understanding the doping mechanism and the resultant electrochemical performance variation. In this regard, many advanced techniques are employed to probe the structural details of the doped Li 4 Ti 5 O 12 that should be responsible for the variation of the electrochemical properties, including Electron energy-loss spectroscopy (EELS), X-ray absorption spectroscopy (XAS), electron paramagnetic resonance (EPR), 7 Li nuclear magnetic resonance magic-angle spinning (NMR-MAS), inductive couple plasma-atomic emission spectrometry (ICP-AES), neutron diffraction (ND) as well as first principle calculation [17,53,[60][61][62][63].…”

Section: Lattice Dopingmentioning

confidence: 99%

Lithium Titanate-Based Anode Materials

Zhao

2015

Rechargeable Batteries

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Graphitic carbon is the most widely used anode material in commercial Li-ion batteries due to its low lithiation potential, long cycle life, abundant resources and low cost. However, Li-ion batteries using graphite as anode material give rise to rate, safety and life problems. During lithium intercalation/deintercalation process, graphite undergoes a considerable volume change (*10 % [1]), which could cause particle cracking and even peeling off of anode film from the current collector, leading to gradual capacity degradation of the electrode [2,3]. Safety concerns arise when the cells experience fast charging, long-term cycling, or low temperature charging owing to the propensity of formation of lithium dendrites, which is induced by the low lithiation potential of the graphite anode (close to 0 V vs. Li/Li + ) and the low lithium ion diffusivity in the graphite lattice [4,5]. As an alternative anode material to carbon, Li 4 Ti 5 O 12 has been extensively studied for the potential use in large-scale Li-ion batteries. Li 4 Ti 5 O 12 shows stable charge/discharge platform at ca. 1.55 V versus Li/Li + , and possesses excellent cycling stability and unique safety characteristic owing to its negligible volume change and high redox potential upon Li-ion intercalation/deintercalation. However, coarse Li 4 Ti 5 O 12 exhibits poor rate performance because of its low electronic conductivity and sluggish lithium ion diffusivity [6,7]. In some cases, especially when aging at elevated temperature or cycling in a long-term regime, gas generation frequently occurs in Li 4 Ti 5 O 12 -based batteries [8]. In past decades, many efforts have been devoted to overcoming these problems and significant advancements have been achieved, which make Li 4 Ti 5 O 12 viable for practical application in batteries for various electrical energy storage, such as electric/hybrid electric/plug-in hybrid electric vehicles (EV/HEV/PHEV), grid load leveling, integration of renewable energy sources, etc.

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Mn-substituted spinel Li4Ti5O12 materials studied by multifrequency EPR spectroscopy

Cited by 79 publications

References 62 publications

Enhanced lithium storage capability of Li 4 Ti 5 O 12 anode material with low content Ce modification

Enhanced lithium storage capability of Li 4 Ti 5 O 12 anode material with low content Ce modification

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Lithium Titanate-Based Anode Materials

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