Journal ArticleDOI
Phase Transitions in Li1 − δ Ni0.5Mn1.5 O 4 during Cycling at 5 V
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TLDR
In this article, the structural change of LiNi 0. 5 Mn 1. 5 O 4 with two different crystallographic structures of Fd3m and P4 3 32 was studied during Li extraction.Abstract:
Structural change of LiNi 0 . 5 Mn 1 . 5 O 4 with two different crystallographic structures of Fd3m and P4 3 32 was studied during Li extraction. Ex situ X-ray diffraction and transmission electron microscopy studies on partially delithiated Li 1 - δ Ni 0 . 5 Mn 1 . 5 O 4 revealed that LiNi 0 . 5 Mn 1 . 5 O 4 (Fd3m) structure lost its characteristic diagonal glide symmetry, suggesting a structural transition arising from the possible migration of cations during oxidation from Ni 2 + to Ni 4 + . For the Li 1 - δ Ni 0 . 5 Mn 1 . 5 O 4 (P4 3 32), ordering of cations was destroyed by random migration of cations during Li extraction, resulting in the formation of intermediate phase with the Fd3m structure. The phase transitions were reversible, meaning that migration of cations is highly reversible during lithiation/delithiation.read more
Citations
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Journal ArticleDOI
The Li-ion rechargeable battery: a perspective.
John B. Goodenough,Kyusung Park +1 more
TL;DR: New strategies are needed for batteries that go beyond powering hand-held devices, such as using electrode hosts with two-electron redox centers; replacing the cathode hosts by materials that undergo displacement reactions; and developing a Li(+) solid electrolyte separator membrane that allows an organic and aqueous liquid electrolyte on the anode and cathode sides, respectively.
Journal ArticleDOI
A perspective on the high-voltage LiMn1.5Ni0.5O4 spinel cathode for lithium-ion batteries
TL;DR: In this article, the authors provide an overview of the recent developments on understanding various factors that influence the electrochemical performance of the high-voltage spinel cathodes, including the degree of cation ordering, Mn3+ content, morphology, and surface planes/compositions in contact with the electrolyte.
Journal ArticleDOI
Comparative Issues of Cathode Materials for Li-Ion Batteries
TL;DR: In this paper, a comparative study of the physical and electrochemical properties of positive electrodes used in lithium-ion batteries is presented, with emphasis on synthesis difficulties, electrochemical stability, faradaic performance and security issues.
Journal ArticleDOI
Advances in the Cathode Materials for Lithium Rechargeable Batteries.
Wontae Lee,Shoaib Muhammad,Chernov Sergey,Hayeon Lee,Jaesang Yoon,Yong-Mook Kang,Won-Sub Yoon +6 more
TL;DR: Various high energy cathode materials which can be used to build next-generation lithium ion batteries are discussed, which includes nickel and lithium-rich layered oxide materials, high voltage spinel oxides, polyanion, cation disordered rock-salt oxides and conversion materials.
Journal ArticleDOI
Key strategies for enhancing the cycling stability and rate capacity of LiNi0.5Mn1.5O4 as high-voltage cathode materials for high power lithium-ion batteries
TL;DR: In this paper, the structure, transport properties and different reported possible fading mechanisms of LNMO cathode are discussed detailedly, and the major goal of this review is to highlight new progress in using proposed strategies to improve the cycling stability and rate capacity of LiNi 0.5 O 4 (LNMO)-based batteries, including synthesis, control of special morphologies, element doping and surface coating etc., especially at elevated temperatures.
References
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Journal ArticleDOI
Improved capacity retention in rechargeable 4 V lithium/lithium- manganese oxide (spinel) cells
TL;DR: In this article, the authors improved the rechargeable capacity of 4 V LixMn2O4 spinel cathodes by modifying the composition of the spinel electrode, achieving a capacity in excess of 100 mAh/g in flooded-electrolyte lithium cells.
Journal ArticleDOI
Synthesis and Electrochemistry of LiNi x Mn2 − x O 4
TL;DR: In this paper, the capacity of coin-type cells at 0 < x < 0.5 and with z ≈ 0.2 was shown to be at 4.1 V.
Journal ArticleDOI
Dissolution of Spinel Oxides and Capacity Losses in 4 V Li/LixMn2O4 Cells
TL;DR: In this paper, the dissolution of spinel manganese oxides and the concomitant cathodic capacity losses were examined in 4 V Li/PC + DME + LiClO 4 /Li x Mn 2 O 4 cells where PC is propylene carbonate and DME is dimethoxyethane.
Journal ArticleDOI
Capacity Fading on Cycling of 4 V Li / LiMn2 O 4 Cells
Abstract: The cycle-life behavior of a Li/1 M-LiPF 6 + EC/DMC(1:2 by volume)/LiMn 2 O 4 cell was investigated at various temperatures (0, 25, and 50°C). The capacity fades faster on cycling at high rather than low temperatures. The mechanisms responsible for the capacity fading of the spinel LiMn 2 O 4 during cycling were extensively investigated by chemical analysis of the dissolved Mn in combination with in situ x-ray diffraction, Rietveld analysis, and ac impedance techniques. Chemical analytical results indicated that the capacity loss caused by the simple dissolution of Mn 3+ accounted for only 23 and 34% of the overall capacity losses cycling at room temperature and 50°C, respectively. In situ x-ray diffraction results showed that the two-phase structure coexisting in the high-voltage region persists during lithium-ion insertion/extraction at low temperatures during cycling. By contrast, this two-phase structure was effectively transformed to a more stable, one-phase structure, accompanied by the dissolution of Mn and the loss of oxygen (e.g., Mn 2 O 3 .MnO) at the high temperature; this dominated the overall capacity-loss process. AC impedance spectra revealed that the capacity loss at the high temperature was also due in part to the decomposition of electrolyte solution at the electrode.
Journal ArticleDOI
A new three-volt spinel Li{sub 1+x}Mn{sub 1.5}Ni{sub 0.5}O{sub 4} for secondary lithium batteries
TL;DR: The spinel LiMn{sub 1.5}Ni{sub 0.5]O{sub 4} has been prepared at low temperature using a new sol-gel process.