The effect of cation mixing controlled by thermal treatment duration on the electrochemical stability of lithium transition-metal oxides

2017 ◽  
Vol 19 (44) ◽  
pp. 29886-29894 ◽  
Author(s):  
Gang Sun ◽  
Xucai Yin ◽  
Wu Yang ◽  
Ailing Song ◽  
Chenxiao Jia ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Treatment Duration ◽  
Electrochemical Stability ◽  
Optimal Degree ◽  
Cation Mixing

An optimal degree of Ni2+occupancy in the lithium layer as “pillaring” that enhances the electrochemical performance of NMC materials.

scholarly journals A universal electrochemical lithiation–delithiation method to prepare low-crystalline metal oxides for high-performance hybrid supercapacitors

RSC Advances ◽  
2021 ◽  
Vol 11 (48) ◽  
pp. 30407-30414
Author(s):  
Zhuo-Dong Wu ◽  
De-Jian Chen ◽  
Long Li ◽  
Li-Na Wang
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
High Performance ◽  
Hybrid Supercapacitors ◽  
Electrochemical Lithiation ◽  
Low Crystalline ◽  
Crystalline Metal

The electrochemical performance of transition metal oxides (TMOs) for hybrid supercapacitors has been optimized through various methods in previous reports.

Controllable synthesis of the defect-enriched MoO3-x nanosheets as an effective visible-light photocatalyst for the degradation of organic dyes

2021 ◽  
Author(s):  
Yuqi Zhang ◽  
Xiang Yu ◽  
Huan Liu ◽  
XInyi LIan ◽  
Bin Shang ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Transition Metal ◽  
Visible Light ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Organic Dyes ◽  
Controllable Synthesis ◽  
Visible Light Photocatalyst ◽  
Solvent Crystallization

Transition metal oxides (TMOs) are emerging as a promising class of photocatalysts for pollutants treatment. In this report, integrating the anti-solvent crystallization and thermal treatment, we develope a facile and...

Improving the electrochemical performance of layered Li-rich transition-metal oxides by alleviating the blockade effect of surface lithium

2016 ◽  
Vol 4 (14) ◽  
pp. 5184-5190 ◽  
Author(s):  
Dong Luo ◽  
Shaohua Fang ◽  
Li Yang ◽  
Shin-ichi Hirano
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Effect Of Surface

The electrochemical performance of layered Li-rich transition-metal oxides can be greatly improved by alleviating the blockade effect of surface lithium.

scholarly journals Crystal-seeds induced construction of ZnO–ZnFe2O4 micro-cubic composites as excellent anode materials for lithium ion battery

RSC Advances ◽  
2018 ◽  
Vol 8 (29) ◽  
pp. 16187-16192 ◽  
Author(s):  
Pei Pan ◽  
Ting Wang ◽  
Lihui Chen ◽  
Feng Wang ◽  
Xiong Yang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Band Gap ◽  
Transition Metal Oxides ◽  
Anode Materials ◽  
Lithium Ion ◽  
Band Gap Energy ◽  
Hetero Structure ◽  
Gap Energy

This work aims at designing a fine assembly of two different transition metal oxides with a distinct band-gap energy into a bi-component-active hetero-structure to improve electrochemical performance.

Improving the electrochemical performance of layered lithium-rich transition-metal oxides by controlling the structural defects

2014 ◽  
Vol 7 (2) ◽  
pp. 705-714 ◽  
Author(s):  
Jinlong Liu ◽  
Mengyan Hou ◽  
Jin Yi ◽  
Shaoshuai Guo ◽  
Congxiao Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Structural Defects

scholarly journals Nonstoichiometric Cu0.6Ni0.4Co2O4 Nanowires as an Anode Material for High Performance Lithium Storage

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 191
Author(s):  
Junhao Li ◽  
Ningyi Jiang ◽  
Jinyun Liao ◽  
Yufa Feng ◽  
Quanbing Liu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Lithium Ion Batteries ◽  
Transition Metal Oxides ◽  
Anode Materials ◽  
High Performance ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Lithium Ion

Transition metal oxide is one of the most promising anode materials for lithium-ion batteries. Generally, the electrochemical property of transition metal oxides can be improved by optimizing their element components and controlling their nano-architecture. Herein, we designed nonstoichiometric Cu0.6Ni0.4Co2O4 nanowires for high performance lithium-ion storage. It is found that the specific capacity of Cu0.6Ni0.4Co2O4 nanowires remain 880 mAh g−1 after 50 cycles, exhibiting much better electrochemical performance than CuCo2O4 and NiCo2O4. After experiencing a large current charge and discharge state, the discharge capacity of Cu0.6Ni0.4Co2O4 nanowires recovers to 780 mAh g−1 at 50 mA g−1, which is ca. 88% of the initial capacity. The high electrochemical performance of Cu0.6Ni0.4Co2O4 nanowires is related to their better electronic conductivity and synergistic effect of metals. This work may provide a new strategy for the design of multicomponent transition metal oxides as anode materials for lithium-ion batteries.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

Problems with oxygen analysis in the system MgO-Al2O3-SiO2 with the electron microprobe

1992 ◽  
Vol 50 (2) ◽  
pp. 1624-1625
Author(s):  
Michel Fialin ◽  
Guy Rémond
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Electrostatic Charge ◽  
Carbon Layer ◽  
Sample Holder ◽  
Rock Matrix ◽  
Electrical Discharges ◽  
Thin Carbon ◽  
Beam Instabilities

Oxygen-bearing minerals are generally strong insulators (e.g. silicates), or if not (e.g. transition metal oxides), they are included within a rock matrix which electrically isolates them from the sample holder contacts. In this respect, a thin carbon layer (150 Å in our laboratory) is evaporated on the sections in order to restore the conductivity. For silicates, overestimated oxygen concentrations are usually noted when transition metal oxides are used as standards. These trends corroborate the results of Bastin and Heijligers on MgO, Al2O3 and SiO2. According to our experiments, these errors are independent of the accelerating voltage used (fig.l).Owing to the low density of preexisting defects within the Al2O3 single-crystal, no significant charge buildup occurs under irradiation at low accelerating voltage (< 10keV). As a consequence, neither beam instabilities, due to electrical discharges within the excited volume, nor losses of energy for beam electrons before striking the sample, due to the presence of the electrostatic charge-induced potential, are noted : measurements from both coated and uncoated samples give comparable results which demonstrates that the carbon coating is not the cause of the observed errors.

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