Cobalt Content Optimization of Layered 0.6Li[Li1/3Mn2/3]O2-0.4LiNi0.5–xMn0.5–xCo2xO2(0 ≤ x ≤ 0.5) Cathode Materials Prepared by the Carbonate Coprecipitation

2012 ◽  
Vol 159 (10) ◽  
pp. A1591-A1597 ◽  
Author(s):  
F. L. Liu ◽  
S. Zhang ◽  
C. Deng ◽  
Q. Wu ◽  
M. Zhang ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Cobalt Content ◽  
Content Optimization

scholarly journals Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 366 ◽  
Author(s):  
JongSeok Jung ◽  
Haena Yim ◽  
Narendra Singh Parmar ◽  
Jae-Seung Lee ◽  
Ji-Won Choi
Keyword(s):  
Thin Film ◽  
Electrochemical Performance ◽  
Cathode Materials ◽  
Electrochemical Impedance ◽  
Cobalt Content ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
X Ray Absorption

Many scientific efforts have been undertaken toward reducing the Co content in LiMn1/3Ni1/3Co1/3O2 cathode materials for thin-film batteries. In this study, we present cathodes with a wide range of Li(Ni, Mn, Co)O2 compositions to determine the material with the best electrochemical performance by changing the ratio of Ni to Mn at a fixed 0.1 at.% of Co by the continuous composition spread sputtering method. The cathode composition measurements by Rutherford backscattering spectroscopy show that the best electrochemical performance is obtained for a composition of Ni:Mn:Co = 19:71:10. The reasons for this improved electrochemical performance are further investigated by X-ray diffraction, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, and X-ray absorption near edge spectroscopy.

scholarly journals Effect of cobalt content on the electrochemical properties and structural stability of NCA type cathode materials

2018 ◽  
Vol 20 (35) ◽  
pp. 22805-22817 ◽  
Author(s):  
Kamalika Ghatak ◽  
Swastik Basu ◽  
Tridip Das ◽  
Vidushi Sharma ◽  
Hemant Kumar ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Structural Stability ◽  
Cathode Materials ◽  
Low Cost ◽  
Cobalt Content ◽  
Computational Design ◽  
Cobalt Concentration ◽  
Environmentally Benign

Computational design of environmentally benign low-cost, cathode materials with reduced cobalt concentration.

Li/Mn-Rich Cathode Materials with Low-Cobalt Content and Core-Shell Particle Design for High-Energy Lithium Ion Batteries

2020 ◽  
Vol 167 (6) ◽  
pp. 060519 ◽  
Author(s):  
Jonathan Helbig ◽  
Thomas Beuse ◽  
Vassilios Siozios ◽  
Tobias Placke ◽  
Martin Winter ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Cobalt Content ◽  
High Energy ◽  
Core Shell ◽  
Shell Particle

Microstructure of Electro-Eroded Cemented Carbide Surfaces

1968 ◽  
Vol 26 ◽  
pp. 284-285
Author(s):  
V. N. Filimonenko ◽  
M. H. Richman ◽  
J. Gurland
Keyword(s):  
Surface Layer ◽  
Cobalt Content ◽  
Cemented Carbides ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Metallographic Examination ◽  
Standard Procedures ◽  
Face Centered ◽  
Diamond Paste ◽  
Plastic Carbon

The high temperatures and pressures that are found in a spark gap during electrical discharging lead to a sharp phase transition and structural transformation in the surface layer of cemented carbides containing WC and cobalt. By means of X-ray diffraction both W2C and a high-temperature monocarbide of tungsten (face-centered cubic) were detected after electro-erosion. The W2C forms as a result of the peritectic reaction, WC → W2C+C. The existence and amount of the phases depend on both the energy of the electro-spark discharge and the cobalt content. In the case of a low-energy discharge (i.e. C=0.01μF, V = 300v), WC(f.c.c.) is generally formed in the surface layer. However, at high energies, (e.g. C=30μF, V = 300v), W2C is formed at the surface in preference to the monocarbide. The phase transformations in the surface layer are retarded by the presence of larger percentages of cobalt.Metallographic examination of the electro-eroded surfaces of cemented carbides was carried out on samples with 5-30% cobalt content. The specimens were first metallographically polished using diamond paste and standard procedures and then subjected to various electrical discharges on a Servomet spark machining device. The samples were then repolished and etched in a 3% NH4OH electrolyte at -0.5 amp/cm2. Two stage plastic-carbon replicas were then made and shadowed with chromium at 27°.

NEW CATHODE MATERIALS FOR INERT AND OXIDIZING ATMOSPHERE PLASMA APPLICATION

1990 ◽  
Vol 51 (C5) ◽  
pp. C5-403-C5-410
Author(s):  
A. A. SADEK ◽  
K. KUSUMOTO ◽  
M. USHIO ◽  
F. MATSUDA
Keyword(s):  
Cathode Materials ◽  
Oxidizing Atmosphere

Increase of resistance of piercing mill mandrels at seamless pipes production of 13Cr grade martensite class stainless steel at line ТПА 159‒426 of JSC VTZ

2020 ◽  
Vol 76 (12) ◽  
pp. 1259-1264
Author(s):  
I. I. Lube ◽  
N. V. Trutnev ◽  
S. V. Tumashev ◽  
A. V. Krasikov ◽  
A. G. Ul’yanov ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Oil And Gas ◽  
Cobalt Content ◽  
Pipe Plant ◽  
Piercing Mill ◽  
Steel Strength ◽  
New Material ◽  
Chemical Composition Of Steel ◽  
Technical Solutions ◽  
Grade Steel

At production of pipes of type 13Cr grade steel used at development of oil and gas deposits in areas with aggressive environment, intensive wear of instrument takes place, first of all, piercing mill mandrels. Factors, influencing the resistivity of the piercing mandrels considered, including chemical composition of the material, the mandrel is made of and its design. Based on industrial experience it was shown, that chrome content in the mandrel material practically does not affect on the increase of its resistivity, since the formed thin protective oxides having high melting temperature, are quickly failed and practically are not restored in the process of piercing. To increase the resistivity of piercing mandrels at production of casing tubes of type 13Cr grade steel, a work was accomplished to select a new material for their manufacturing. The chemical composition of steel presented, which was traditionally used for piercing mandrels manufacturing, as well as a steel grade proposed to increase their resistivity. First, molybdenum content was increased, which increases the characteristics of steel strength and ductility at high temperatures and results in grain refining. Second, tungsten content was also increased, which forms carbides in the steel resulting in an increase of its hardness and “red resistivity”, as well as in preventing grains growth during heating. Third, cobalt content was also increased, which increases heat resistivity and shock loads resistivity. The three elements increase enabled to increase the mandrels resistivity by two times. Results of mandrel test of steel 20ХН2МВ3КБ presented, the mandrel having corrugation on the working cone surface, which enabled to reach the resistivity growth to 12 passes without significant change of instrument cost. Microstructure of mandrels made of steels 20Х2Н4МФА and 20ХН2МВ3КБ shown. Application of the centering pin of special design was tested, which provided forming of a rounding edge on the front billet ends, eliminated undercut of mandrel external surface in the process of secondary billet grip and increase the service life of the piercing mill mandrels. At production of seamless pipes of martensite class type 13Cr stainless steels having L80 group of strength, an increase of piercing mandrel resistivity was reached by more than four times, which together with other technical solutions enabled to increase the hourly productivity of the hot rolling section of Volzhsky pipe plant ТПА 159-426 line by more than two times.

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