Synthesis and electrochemical properties of Li1.3Nb0.3V0.4O2 as a positive electrode material for rechargeable lithium batteries

Yabuuchi, Naoaki; Takeuchi, Mitsue; Komaba, Shinichi; Ichikawa, Shin-nosuke; Ozaki, Tomonobu; Inamasu, Tokuo

doi:10.1039/c5cc08034g

Cited by 78 publications

(71 citation statements)

References 23 publications

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“…Although pure Li 3 NbO 4 is electrochemically inactive, the substitution of 3 d transition‐metal ions for Nb/Li ions effectively induces conductive electrons as mentioned above ,. Such 3 d transition‐metal ions can accept electrons from oxide ions, leading to the activation of anionic redox coupled with cationic redox.…”

Section: Li3nbo4‐ and Li2tio3‐based Systems; Reversible And Irreversimentioning

confidence: 95%

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

Yabuuchi

2018

The Chemical Record

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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.

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Section: Li3nbo4‐ and Li2tio3‐based Systems; Reversible And Irreversimentioning

confidence: 95%

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

Yabuuchi

2018

The Chemical Record

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“…Recently, Li-excess disordered (rocksalt) transition metal oxides (LEX-RS), such as Li 1.211 Mo 0.467 Cr 0.3 O 2 , Li 1.3 Mn 0.4 Nb 0.3 O 2 , Li 1.2 Mn 0.4 Ti 0.4 O 2 , and Li 1.2 Ni 0.333 Ti 0.333 Mo 0.133 O 2 , have gained much attention as a new class of high-capacity cathode materials, delivering capacities as high as 300 mAh g –1 4–12 . The surge of interest in these materials, previously thought to be inactive 13–15 , is due to the realization that cation disorder can be tolerated as long as enough Li excess is present in the compound.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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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.

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“…Reversible capacity of electrode materials is potentially further increased by the enrichment of lithium contents with less transition metals in the close-packed structure of oxide ions. Recently, our group has reported that Li 3 NbO 4 (refs 20, 21) and Li 4 MoO 5 (ref. 22), which have higher lithium contents than those of Li 2 MnO 3 and Li 2 RuO 3 , are potentially utilized as host structures for a new series of high-capacity electrode materials.…”

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confidence: 99%

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

et al. 2016

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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.

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Synthesis and electrochemical properties of Li_1.3Nb_0.3V_0.4O₂ as a positive electrode material for rechargeable lithium batteries

Cited by 78 publications

References 23 publications

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

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

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

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