Synthesis and Electrode Performance of Li&lt;sub&gt;4&lt;/sub&gt;MoO&lt;sub&gt;5&lt;/sub&gt;-LiFeO&lt;sub&gt;2&lt;/sub&gt; Binary System as Positive Electrode Materials for Rechargeable Lithium Batteries

Matsuhara, Takashi; Tsuchiya, Yuka; Yamanaka, Kazushi; Mitsuhara, Kei; Ohta, Toshiaki; Yabuuchi, Naoaki

doi:10.5796/electrochemistry.84.797

Cited by 33 publications

(43 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There were no visible spectral features in the Mo M-edge. We expect Mo to remain largely as Mo 6+ (as previously observed for LN20) 9, 17 , though a small amount of oxygen loss during the first charge may allow for some Mo reduction near the surface of LNF15 particles upon subsequent discharge 9, 29 . The F K-edge spectra are not presented due to the strong but non-relevant contribution from the PTFE binder.…”

Section: Resultssupporting

confidence: 57%

Mitigating oxygen loss to improve the cycling performance of high capacity cation-disordered cathode materials

et al. 2017

View full text Add to dashboard Cite

Recent progress in the understanding of percolation theory points to cation-disordered lithium-excess transition metal oxides as high-capacity lithium-ion cathode materials. Nevertheless, the oxygen redox processes required for these materials to deliver high capacity can trigger oxygen loss, which leads to the formation of resistive surface layers on the cathode particles. We demonstrate here that, somewhat surprisingly, fluorine can be incorporated into the bulk of disordered lithium nickel titanium molybdenum oxides using a standard solid-state method to increase the nickel content, and that this compositional modification is very effective in reducing oxygen loss, improving energy density, average voltage, and rate performance. We argue that the valence reduction on the anion site, offered by fluorine incorporation, opens up significant opportunities for the design of high-capacity cation-disordered cathode materials.

show abstract

Section: Resultssupporting

confidence: 57%

Mitigating oxygen loss to improve the cycling performance of high capacity cation-disordered cathode materials

et al. 2017

View full text Add to dashboard Cite

show abstract

“…37) and Li 1.42 Mo 0.29 Fe 0.29 O 2 (ref. 38). Similar to Li 1.3− x Nb 0.3 Fe 0.4 O 2 clear evidence for the formation of superoxide and large polarization on charge/discharge have been reported for both samples.…”

Section: Resultsmentioning

confidence: 99%

Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries

et al. 2016

Self Cite

View full text Add to dashboard Cite

Further increase in energy density of lithium batteries is needed for zero emission vehicles. However, energy density is restricted by unavoidable theoretical limits for positive electrodes used in commercial applications. One possibility towards energy densities exceeding these limits is to utilize anion (oxide ion) redox, instead of classical transition metal redox. Nevertheless, origin of activation of the oxide ion and its stabilization mechanism are not fully understood. Here we demonstrate that the suppression of formation of superoxide-like species on lithium extraction results in reversible redox for oxide ions, which is stabilized by the presence of relatively less covalent character of Mn4+ with oxide ions without the sacrifice of electronic conductivity. On the basis of these findings, we report an electrode material, whose metallic constituents consist only of 3d transition metal elements. The material delivers a reversible capacity of 300 mAh g−1 based on solid-state redox reaction of oxide ions.

show abstract

“…Similarly, a binary system, x Li 4 MoO 5 −(1− x ) LiFeO 2 , is studied as electrode materials for rechargeable lithium batteries . A sample of single phase is obtained at x =0.5, and it is found that Li 1.42 Mo 0.29 Fe 0.29 O 2 ( x =0.5) also crystalizes into Li 5 ReO 6 ‐type structure.…”

Section: Li4moo5 As Host Structure Of Lithium‐excess Compoundsmentioning

confidence: 99%

Material Design Concept of Lithium‐Excess Electrode Materials with Rocksalt‐Related Structures for Rechargeable Non‐Aqueous Batteries

Yabuuchi

2018

The Chemical Record

Self Cite

View full text Add to dashboard Cite

Dependence on lithium‐ion batteries for automobile applications is rapidly increasing, and further improvement, especially for positive electrode materials, is indispensable to increase energy density of lithium‐ion batteries. In the past several years, many new lithium‐excess high‐capacity electrode materials with rocksalt‐related structures have been reported. These materials deliver high reversible capacity with cationic/anionic redox and percolative lithium migration in the oxide/oxyfluoride framework structures, and recent research progresses on these electrode materials are reviewed. Material design strategies for these lithium‐excess electrode materials are also described. Future possibility of high‐energy non‐aqueous batteries with advanced positive electrode materials is discussed for more details.

show abstract

Synthesis and Electrode Performance of Li<sub>4</sub>MoO<sub>5</sub>-LiFeO<sub>2</sub> Binary System as Positive Electrode Materials for Rechargeable Lithium Batteries

Cited by 33 publications

References 21 publications

Mitigating oxygen loss to improve the cycling performance of high capacity cation-disordered cathode materials

Mitigating oxygen loss to improve the cycling performance of high capacity cation-disordered cathode materials

Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries

Material Design Concept of Lithium‐Excess Electrode Materials with Rocksalt‐Related Structures for Rechargeable Non‐Aqueous Batteries

Contact Info

Product

Resources

About