Journal ArticleDOI
Investigation of the Local Structure of the LiNi0.5Mn0.5 O 2 Cathode Material during Electrochemical Cycling by X-Ray Absorption and NMR Spectroscopy
Won-Sub Yoon,Won-Sub Yoon,Younkee Paik,Xiao-Qing Yang,Mahalingam Balasubramanian,James McBreen,Clare P. Grey +6 more
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TLDR
In situ X-ray absorption spectroscopy (XAS) of the Mn and Ni K-edges and 6 Li magic angle spinning (MAS) nuclear magnetic resonance (NMR) was carried out during the first charging and discharging process for the layered LiNi 0.5 Mn 0. 5 O 2 cathode material as discussed by the authors.Abstract:
In situ X-ray absorption spectroscopy (XAS) of the Mn and Ni K-edges and 6 Li magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy have been carried out during the first charging and discharging process for the layered LiNi 0 . 5 Mn 0 . 5 O 2 cathode material. The Ni K-edge structure in the X-ray absorption near-edge structure (XANES) spectrum exhibits a rigid positive energy shift with increased Li deintercalation level, while the Mn XANES spectra do not show any substantial energy changes. The Ni edge shifts back reversibly during discharge. Further Li-ion intercalation at ∼1 V (vs. Li) could be accomplished by reduction of the Mn 4 + ions. The 6 Li MAS NMR results showed the presence of Li in the Ni 2 + /Mn 4 + layers, in addition to the expected sites for Li in the lithium layers. All the Li ions in the transition metal layers are removed on the first charge, leaving residual lithium ions in the lithium layers.read more
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Journal ArticleDOI
Electrodes with high power and high capacity for rechargeable lithium batteries.
Kisuk Kang,Ying Shirley Meng,Ying Shirley Meng,Julien Breger,Julien Breger,Clare P. Grey,Clare P. Grey,Gerbrand Ceder,Gerbrand Ceder +8 more
TL;DR: By modifying its crystal structure, lithium nickel manganese oxide is obtained unexpectedly high rate-capability, considerably better than lithium cobalt oxide (LiCoO2), the current battery electrode material of choice.
Journal ArticleDOI
Positive Electrode Materials for Li-Ion and Li-Batteries†
TL;DR: In this article, positive electrodes for Li-ion and lithium batteries have been under intense scrutiny since the advent of the Li ion cell in 1991, and a growing interest in developing Li−sulfur and Li−air batteries that have the potential for vastly increased capacity and energy density, which is needed to power large scale systems.
Journal ArticleDOI
Nickel-Rich and Lithium-Rich Layered Oxide Cathodes: Progress and Perspectives
TL;DR: Li-rich layered oxides have attracted much research interest as cathodes for Li-ion batteries due to their low cost and higher discharge capacities compared to those of LiCoO2 and LiMn2O4 as mentioned in this paper.
Journal ArticleDOI
An Initial Review of the Status of Electrode Materials for Potassium-Ion Batteries
TL;DR: In this paper, the status of room-temperature potassium-ion batteries is reviewed in light of recent concerns regarding the rising cost of lithium and the fact that room temperature sodium ion batteries have yet to be commercialized thus far.
Journal ArticleDOI
Identifying surface structural changes in layered Li-excess nickel manganese oxides in high voltage lithium ion batteries: A joint experimental and theoretical study
TL;DR: In this article, a detailed lithium de-intercalation mechanism was proposed for high voltage high energy density cathode materials, which showed clear evidence of a new spinel-like solid phase formed on the surface of the electrode materials after high-voltage cycling.
References
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Journal ArticleDOI
Layered Cathode Materials Li [ Ni x Li ( 1 / 3 − 2x / 3 ) Mn ( 2 / 3 − x / 3 ) ] O 2 for Lithium-Ion Batteries
TL;DR: The structure, synthesis, and electrochemical behavior of layered for 5/12, and 1/2 are reported for the first time in this article, where the authors derive from or by substitution of and by while maintaining all the remaining Mn atoms in the 4+ oxidation state.
Journal ArticleDOI
Synthesis, Structure, and Electrochemical Behavior of Li [ Ni x Li1 / 3 − 2x / 3Mn2 / 3 − x / 3 ] O 2
TL;DR: Li[Ni x Li 1/3 2x/3 Mn 2/3 3/3 ]O 2 for 0 < x ≤ 1/2 is presented in this paper.
Journal ArticleDOI
Layered Lithium Insertion Material of LiNi1/2Mn1/2O2 : A Possible Alternative to LiCoO2 for Advanced Lithium-Ion Batteries
TL;DR: In this paper, a layered nickel manganese oxide of LiNi1/2Mn 1/2O2 (a = 2.89 A and c = 14.30 A in hexagonal setting) was successfully prepared and shown that this material may be a possible alternative to LiCoO2 for advanced lithium batteries.
Journal ArticleDOI
Novel Lithium‐Ion Cathode Materials Based on Layered Manganese Oxides
TL;DR: In this article, the authors focus on the use of layered manganese oxide as a base for developing novel complex solid-solution cathode materials with improved capacity, cycling stability, and safety.
Journal ArticleDOI
Structure and electrochemistry of lithium cobalt oxide synthesised at 400°C
TL;DR: LiCoO2 (400°C) as discussed by the authors is a compound that was prepared by the reaction of Li2CO3 and CoCO3 at 400°C, which has approximately 6% cobalt within the lithium layers and is stable in many of the organic-based electrolytes that are currently employed in lithium cells.
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