Effect of molten salt synthesis temperature on TiO2 and Li cycling properties

Robust electrochemistry of black TiO2 as stable and high-rate negative electrode for lithium-ion batteries

“…Reddy group demonstrated that the resistance will decrease as we move from potential 3.0 to 0.05 V (lithiation). However, resistance in the potential window (1.6-2.1 V) where typical redox reaction takes place will be low compared to impedance at different potentials [67][68][69][70][71]. An irreversible capacity loss is generally observed in the first cycle (here 40%) when TiO 2 is cycled in the wider potential window and is due to (1) sluggish delithiation kinetics for first few cycles, which is due to excess of Li + ions trapped in TiO 2 matrix; (2) irreversible intercalation/insertion of Li + ions into the matrix;…”

Synthesis and Characterization of Fe2+ Ion-Exchanged TiO2 Materials and Their Supported V2O5 Catalysts for a Great Depression of the Formation of N2O in the Selective Reduction of NO by NH3

“…Figure c shows the Ti 2p core level XPS spectra of FeT200, FeT300, FeT400, and HT. All of the FeTns had Ti 2p 3/2 and Ti 2p 1/2 binding energies at 459.0 and 464.7 eV, respectively, as provided in spectra (S1)–(S3) in Figure c, and these Ti 2p signals are the feature of the lattice Ti 4+ in the octahedrally coordinated Ti–O (Ti VI sites) environments. ,, The spin–orbit coupling (“SOC”) between the Ti 2p 3/2 and Ti 2p 1/2 peaks (Δ E SOC ) was 5.7 eV, in good agreement with literature data. , Binding energies for Ti 2p 3/2 and Ti 2p 1/2 in the HT were 458.6 and 464.3 eV, respectively, as shown in Figure c, (S4). These values, assigned to Ti 4+ atoms existing in the lattice Ti VI sites as well, were somewhat lower, by 0.4 eV, than those measured with the FeTns [Figure c, (S1)–(S3)], even though the HT had the same Δ E SOC value as that of the FeTns.…”

“…63,67,68 The spin− orbit coupling ("SOC") between the Ti 2p 3/2 and Ti 2p 1/2 peaks (ΔE SOC ) was 5.7 eV, in good agreement with literature data. 63,69 Binding energies for Ti 2p 3/2 and Ti 2p 1/2 in the HT were 458.6 and 464.3 eV, respectively, as shown in Figure 8c, (S4). These values, assigned to Ti 4+ atoms existing in the lattice Ti VI sites as well, were somewhat lower, by 0.4 eV, than those measured with the FeTns [Figure 8c, (S1)−(S3)], even though the HT had the same ΔE SOC value as that of the FeTns.…”

The Effect of Key Electronic States on Excess Lithium Intercalation in Li2RuyMn1–yO3

“…How do the special electronic states affect the excess lithium intercalation? At the first thought, it might be attributed to the achievement of charge compensation through the special electronic states since Li + and electron storage are indispensable. , However, this speculation is challenged by the Li + intercalation in TiO 2 and δ-MnO 2 in the voltage range from 1.0 to 3.0 V. , The energy level of the local electronic states of Ti in LTO is similar to that in TiO 2 due to the similar Ti–O 6 octahedral coordination. Likewise, the situation is also suitable for LMO and δ-MnO 2 .…”