In situ synchrotron diffraction study of charge–discharge mechanism of sol–gel synthesized LiM0.5Mn1.5O4 (M=Fe, Co)

Bhaskar, Aiswarya; Bramnik, Natalia N.; Trots, D.; Fueß, H.; Ehrenberg, Helmut

doi:10.1016/j.jpowsour.2012.06.032

Cited by 16 publications

(15 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above observations could imply that the origin of the phase separation in LNFMO could be a kinetic limitation of the Li diffusion into/from the structure rather than a true phase‐transition mechanism 41. Figure 9a and b display the evolution of the lattice parameter as a function of the Li content for both the undoped and the Fe‐doped sample.…”

Section: Resultsmentioning

confidence: 96%

Influence of Iron on the Structural Evolution of LiNi_0.4Fe_0.2Mn_1.4O₄ during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Yavuz

Kiziltas-Yavuz

Bhaskar

et al. 2014

Zeitschrift anorg allge chemie

Self Cite

View full text Add to dashboard Cite

The cathode materials LiNi 0.5 Mn 1.5 O 4 and LiNi 0.4 Fe 0.2 Mn 1.4 O 4 were synthesized using a citric acid-assisted solgel method with a final calcination temperature of 1000°C. An impurity phase exists in LiNi 0.5 Mn 1.5 O 4 powders, which can be eliminated by substituting some of the Ni 2+ and Mn 4+ ions with Fe 3+ . The substitution of Fe into the spinel structure was confirmed by NMR and Mössbauer spectroscopy. The initial capacity of LiNi 0.4 Fe 0.2 Mn 1.4 O 4 powder synthesized at 1000°C (LNFMO) is slightly higher than that of LiNi 0.5 Mn 1.5 O 4 powder synthesized at 1000°C (LNMO). Addition-* M. Yavuz

show abstract

Section: Resultsmentioning

confidence: 96%

Influence of Iron on the Structural Evolution of LiNi_0.4Fe_0.2Mn_1.4O₄ during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Yavuz

Kiziltas-Yavuz

Bhaskar

et al. 2014

Zeitschrift anorg allge chemie

Self Cite

View full text Add to dashboard Cite

show abstract

“…These results imply that extreme lithium extraction leads to a structural transition into two spinel phases. The newly formed spinel phase shows larger lattice contraction (10.7%, 49 The interfacial charge transfer reactions corresponding to the Li + insertion/ extraction changed after long-term cycling, as probed by electrochemical impedance spectroscopy (Fig. S5, ESI †).…”

Section: Xrd 7 LI Nmr and Pdf Analysismentioning

confidence: 99%

Nanoscale spinel LiFeTiO₄for intercalation pseudocapacitive Li⁺storage

Chen

Knapp

Yavuz

et al. 2015

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Intercalation pseudocapacitive Li(+) storage has been recognized recently in metal oxide materials, wherein Li(+) intercalation into the lattice is not solid-state diffusion-limited. This may bridge the performance gap between electrochemical capacitors and battery materials. To date, only a few materials with desired crystal structure and with well-defined nanoarchitectures have been found to exhibit such attractive behaviour. Herein, we report for the first time that nanoscale spinel LiFeTiO4 as a cathode material for Li-ion batteries exhibits intercalation pseudocapacitive Li(+) storage behaviour. Nanoscale LiFeTiO4 nanoparticles with native carbon coating were synthesized by a sol-gel route. A fast and large-amount of Li(+) storage (up to 1.6 Li(+) per formula unit over cycling) in the nanoscale LiFeTiO4 host has been achieved without compromising kinetics.

show abstract

“…The involvement of Fe 3+ /Fe 4+ redox couple for LiFeTiO 4 /C is unclear. Electrochemical Fe 3+ /Fe 4+ redox reactions in spinel LiFe 0.5 Mn 1.5 O 4 have been observed at higher voltage between 4.9-5.3 V (using 1M LiPF 6 in EC:DMC (1:2) as electrolyte) (21).…”

Section: Electrochemical Performancementioning

confidence: 97%

(De)lithiation-Induced Phase Transitions of LiMTiO₄Spinels

et al. 2014

View full text Add to dashboard Cite

Nanocrystalline LiMn 3+ TiO 4 (~10 nm, annealed in air at 500°C) and LiFe 3+ TiO 4 (3~5 nm, annealed in argon at 600°C) were synthesized by a sol-gel route, and their structural changes upon Li + extraction and reinsertion were investigated. To determine accurately the phase compositions of the nanosized materials, we used combined techniques of X-ray diffraction (XRD) Rietveld refinement and synchrotron pair distribution function (PDF) analysis. Partial lithium from LiMTiO 4 (M = Mn, Fe) can be extracted on charging to 4.8 V, leading to Li-deficient Li 1-x MTiO 4 with a phase splitting into two spinel phases. Over subsequent cycling between 1.5 and 4.8 V, more than one Li + can be reversibly reinserted into the framework, resulting in a Li-rich Li x+y MTiO 4 . Upon lithiation, Li 1+y MnTiO 4 undergoes a reversible spinel/rock-salt phase transition together with the formation of certain amounts of tetragonal phase, whereas LiFeTiO 4 maintains a spinel structure.

show abstract

In situ synchrotron diffraction study of charge–discharge mechanism of sol–gel synthesized LiM0.5Mn1.5O4 (M=Fe, Co)

Cited by 16 publications

References 17 publications

Influence of Iron on the Structural Evolution of LiNi_0.4Fe_0.2Mn_1.4O₄ during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Influence of Iron on the Structural Evolution of LiNi_0.4Fe_0.2Mn_1.4O₄ during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Nanoscale spinel LiFeTiO₄for intercalation pseudocapacitive Li⁺storage

(De)lithiation-Induced Phase Transitions of LiMTiO₄Spinels

Contact Info

Product

Resources

About

In situ synchrotron diffraction study of charge–discharge mechanism of sol–gel synthesized LiM0.5Mn1.5O4 (M=Fe, Co)

Cited by 16 publications

References 17 publications

Influence of Iron on the Structural Evolution of LiNi0.4Fe0.2Mn1.4O4 during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Influence of Iron on the Structural Evolution of LiNi0.4Fe0.2Mn1.4O4 during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Nanoscale spinel LiFeTiO4for intercalation pseudocapacitive Li+storage

(De)lithiation-Induced Phase Transitions of LiMTiO4 Spinels

Contact Info

Product

Resources

About

Influence of Iron on the Structural Evolution of LiNi_0.4Fe_0.2Mn_1.4O₄ during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Influence of Iron on the Structural Evolution of LiNi_0.4Fe_0.2Mn_1.4O₄ during Electrochemical Cycling Investigated by in situ Powder Diffraction and Spectroscopic Methods

Nanoscale spinel LiFeTiO₄for intercalation pseudocapacitive Li⁺storage

(De)lithiation-Induced Phase Transitions of LiMTiO₄Spinels