A disordered rock-salt Li-excess cathode material with high capacity and substantial oxygen redox activity: Li 1.25 Nb 0.25 Mn 0.5 O 2

Wang, Rui; Li, Xin; Liu, Lei; Lee, Jinhyuk; Seo, Dong‐Hwa; Bo, Shou‐Hang; Urban, Alexander; Ceder, Gerbrand

doi:10.1016/j.elecom.2015.08.003

Cited by 152 publications

(129 citation statements)

References 24 publications

Supporting

Mentioning

117

Contrasting

Unclassified

Order By: Relevance

“…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. Similar concepts are also proposed in the literature2324. Manganese-substituted Li 3 NbO 4 , Li 1.3 Nb 0.3 Mn 0.4 O 2 (0.43Li 3 NbO 4 –0.57LiMnO 2 ), delivers large reversible capacity (approximately 300 mAh g −1 ) with reversible solid-state redox reaction of oxide ions20.…”

supporting

confidence: 59%

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

et al. 2016

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

supporting

confidence: 59%

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

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Li ions and Mi ons in most cathode materials are located in distinct sites having ac ertain ordering, and these ordered structure materials have been pursued until recently.H owever,r ecent studies have shown that Li-excess cation disordered materials can offer high capacities and good stability. [9,[49][50][51][52] Thestructure of disordered rock-salt materials,from as imple point of view,c an be described as the "layered structure in which cations are randomly arranged". When the proportion of Li ions exceeds that of Mi ons in the LiMO 2 (i.e., Li 1+x M 1Àx O 2 ), the excess Li ions have to occupy the M layer.…”

Section: Disordered Rock-salt Cathodesmentioning

confidence: 99%

Advances in the Cathode Materials for Lithium Rechargeable Batteries

et al. 2019

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7] Nevertheless, especially energydemanding applications necessitate the development of new low-voltage anode and high-voltage cathode materials with improved specific capacities (where energy storage is based on some form of battery storage, such as insertion, conversion or alloying reactions). [8][9][10][11][12][13] However, despite the possibility of achieving high specific capacities, currently used materials often fall short of capacity retention over cycling.…”

Section: Introductionmentioning

confidence: 99%

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

Breitung

Schiele

Tripković

et al. 2020

Batteries & Supercaps

View full text Add to dashboard Cite

Multicomponent materials may exhibit favorable Li‐storage properties because of entropy stabilization. While the first examples of high‐entropy oxides and oxyfluorides show good cycling performance, they suffer from various problems. Here, we report on side reactions leading to gas evolution in Li‐ion cells using rock‐salt (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O (HEO) or Li(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)OF (Li(HEO)F). Differential electrochemical mass spectrometry indicates that a robust solid‐electrolyte interphase layer is formed on the HEO anode, even when using an additive‐free electrolyte. For the Li(HEO)F cathode, the cumulative amount of gases is found by pressure measurements to depend strongly on the upper cutoff potential used during cycling. Cells charged to 5.0 V versus Li+/Li show the evolution of O2, H2, CO2, CO and POF3, with the latter species being indirectly due to lattice O2 release as confirmed by electron energy loss spectroscopy. This result attests to the negative effect that lattice instability at high potentials has on the gassing.

show abstract

A disordered rock-salt Li-excess cathode material with high capacity and substantial oxygen redox activity: Li 1.25 Nb 0.25 Mn 0.5 O 2

Cited by 152 publications

References 24 publications

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

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

Advances in the Cathode Materials for Lithium Rechargeable Batteries

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

Contact Info

Product

Resources

About