scholarly journals Structural, Morphological and Impedance Spectroscopic Analyses of Nano Li(Li0.05Ni0.4Co0.3Mn0.25)O2 Cathode Material Prepared by Sol-Gel Method

2014 ◽  
Vol 17 (3) ◽  
pp. 153-158
Author(s):  
A. Nichelson ◽  
S. Thanikaikarasan ◽  
Pratap Kollu ◽  
P. J. Sebastian ◽  
T. Mahalingam ◽  
...  
Keyword(s):  
Cathode Material ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Diffusion Path ◽  
X Ray Diffraction ◽  
Electrical Studies ◽  
Ft Ir ◽  
Gel Technique ◽  
Ft Ir Spectroscopy

In the present work, layered lithium rich Li(Li0.05Ni0.4Co0.3Mn0.25)O2 cathode materials were synthesized and its structural and electrical studies were analyzed. Layered Li(Li0.05Ni0.4Co0.3Mn0.25)O2 cathode material was prepared by sol-gel technique using citric acid as chelating agent. The prepared sample was characterized by X-ray diffraction, SEM-EDS studies. The crystallite size of the Li(Li0.05Ni0.4Co0.3Mn0.25)O2 cathode material was about 57 nm in which the diffusion path of lithium ion is effectively possible. The complexation behavior of prepared cathode material was analyzed by FT-IR spectroscopy. The electrical properties of the prepared Li(Li0.05Ni0.4Co0.3Mn0.25)O2 cathode material was studied by impedance and dielectric spectral analyzes. The maximum ionic conductivity of LiLi0.05Ni0.4Co0.3Mn0.25)O2 was found to be in the order of 10-3.4 S/cm. The dielectric analysis of cathode material confirms the non-Debye type behavior.

Synthesis and Characterization of Li(Li0.05Ni0.6Fe0.1Mn0.25)O2 Cathode Material for Lithim Ion Batteries

2018 ◽  
Vol 21 (1) ◽  
pp. 051-056
Author(s):  
A. Nichelson ◽  
S. Thanikaikarasan ◽  
K. Karuppasamy ◽  
S. Karthickprabhu ◽  
T. Mahalingam ◽  
...  
Keyword(s):  
Cathode Material ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
X Ray Diffraction ◽  
Morphological Studies ◽  
New Type ◽  
Ft Ir ◽  
Ir And Raman

A new type of lithium enriched cathode material Li (Li0.05Ni0.6Fe0.1Mn0.25)O2 was synthesized by sol-gel method with citric acid as a chelating agent. The structural and morphological studies were systematically investigated through X-ray diffraction, SEM with EDS, FT-IR and Raman analyses. The crystallite size of the Li (Li0.05Ni0.6Fe0.1Mn0.25)O2 cathode material was found to be 45 nm thereby leads to the feasible movement of lithium ion all through the material. FT-IR spectroscopy was used to confirm the metal-oxygen interaction in the prepared cathode material. The electrical properties of the Li (Li0.05Ni0.6Fe0.1Mn0.25)O2 cathode material were studied by impedance and dielectric spectral analyzes. Li (Li0.05Ni0.6Fe0.1Mn0.25)O2 showed a maximum ionic conductivity of 10-6 S/cm at ambient temperature.

Characterization of SrBi2Nb2O9 Thin Films Prepared by Sol Gel Technique

1996 ◽  
Vol 459 ◽  
Author(s):  
E. Ching-Prado ◽  
W. Pérez ◽  
A. Reynés-Figueroa ◽  
R. S. Katiyar ◽  
D. Ravichandran ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Band ◽  
Sol Gel ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Gel Technique ◽  
High Degree ◽  
First Time

ABSTRACTThin films of SrBi2Nb2O9 (SBN) with thicknesses of 0.1, 0.2, and 0.4 μ were grown by Sol-gel technique on silicon, and annealed at 650°C. The SBN films were investigated by Raman scatering for the first time. Raman spectra in some of the samples present bands around 60, 167, 196, 222, 302, 451, 560, 771, 837, and 863 cm−1, which correspond to the SBN formation. The study indicates that the films are inhomogeneous, and only in samples with thicknesses 0.4 μ the SBN material was found in some places. The prominent Raman band around 870 cm−1, which is the A1g mode of the orthorhombic symmetry, is assigned to the symmetric stretching of the NbO6 octahedrals. The frequency of this band is found to shift in different places in the same sample, as well as from sample to sample. The frequency shifts and the width of the Raman bands are discussed in term of ions in non-equilibrium positions. FT-IR spectra reveal a sharp peak at 1260 cm−1, and two broad bands around 995 and 772 cm−1. The bandwidths of the latter two bands are believed to be associated with the presence of a high degree of defects in the films. The experimental results of the SBN films are compared with those obtained in SBT (T=Ta) films. X-ray diffraction and SEM techniques are also used for the structural characterization.

scholarly journals Structural and conductivity studies of LiNi0.5Mn0.5O2 cathode materials for lithium-ion batteries

2016 ◽  
Vol 34 (2) ◽  
pp. 404-411 ◽  
Author(s):  
N. Murali ◽  
K. Vijaya babu ◽  
K. Ephraim babu ◽  
V. Veeraiah
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Morphological Changes ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Negative Temperature ◽  
Debye Relaxation ◽  
High Discharge Capacity ◽  
Ft Ir

AbstractLayered oxide LiMO2 (Ni, Co, Mn) have been proposed as cathode materials for lithium-ion batteries. Mainly LiNiO2 is accepted as an attractive cathode material because of its various advantages such as low cost, high discharge capacity, good reversibility. The LiNi0.5Mn0.5O2 powders are synthesized by a sol-gel method using citric acid as a chelating agent. The structure of the synthesized material is analyzed by using XRD, FT-IR and the microstructures of the samples are observed by using FESEM. The intensities and positions of the peaks are in a good agreement with the previous results. The morphological changes are clearly observed as a result of manganese substitution. The Fourier transform infrared (FT-IR) spectra obtained with KBr pellet data reveal the structure of the oxide lattice constituted by LiO6 and NiO6 octahedra. The conductivity studies are characterized by (EIS) in the frequency range of 42 Hz to 1 MHz at room temperature to 120 °C. The dielectric properties are analyzed in the framework of complex dielectric permittivity and complex electric modulus formalisms. It indicates that the conductivity increases with increasing temperature. The fitting data of EIS plots replicate the non-Debye relaxation process with negative temperature coefficient of resistance (NTCR) behavior.

Facile Synthesis of Electrospun LiNi0.5Co0.2Mn0.3O2 Nanofiber as High-Performance Cathode for Lithium-Ion Batteries

2017 ◽  
Vol 727 ◽  
pp. 663-669
Author(s):  
Zhi Yuan Cao ◽  
Yu Feng Song ◽  
Xia Shen ◽  
Jian Hui Fang
Keyword(s):  
High Performance ◽  
Lithium Ion ◽  
Electrospun Nanofibers ◽  
Precipitation Method ◽  
Diffraction Field ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Co Precipitation ◽  
Ion Intercalation ◽  
Ft Ir Spectroscopy

Ni-rich layer LiNi0.5Co0.2Mn0.3O2 cathode materials have been synthesized by Electrospinning and co-precipitation method. The physical, chemical, and electrochemical properties of the LiNi0.5Co0.2Mn0.3O2 nanofibers were investigated by X-ray diffraction, field emission−scanning electron microscopy (FESEM), Fourier transform infrared (FT-IR) spectroscopy,Brunauer, Emmett, and Teller (BET) measurements, and galvanostatic tests. The electrospun nanofibers with small particle size and hollow tubes provided fast lithium ion intercalation and de-intercalation properties, leading to an enhanced electrochemical capability for LiNi0.5Co0.2Mn0.3O2 nanofibers.

scholarly journals Enhanced electrochemical performance of RuO2 doped LiNi1/3Mn1/3Co1/3O2 cathode material for Lithium-ion battery

2021 ◽  
Author(s):  
K. Kalaiselvi ◽  
S. Premlatha ◽  
M. Raju ◽  
Paruthimal Kalaignan Guruvaiah
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
High Discharge Capacity ◽  
Nitrate Precursor

Abstract LiNi1/3Mn1/3Co1/3O2 as a promising cathode material for lithium-ion batteries was synthesized by a sol-gel method using nitrate precursor calcined at 800°C for 10 hours. The crystallite nature of samples is confirmed from X-ray diffraction analysis. SEM and TEM analyses were used to investigate the surface morphology of the prepared samples. It was found that, highly crystalline polyhedral RuO2 nanoparticles are well doped on the surface of pristine LiNi1/3Mn1/3Co1/3O2 with a size of about approximately 200 nm. The chemical composition of the prepared samples was characterized by EDX and XPS analyses. The electrochemical performance of the proposed material was studied by cyclic voltammetry and charge/discharge analyses. The electrode kinetics of the samples was studied by electrochemical impedance spectroscopy. The developed RuO2 doping may provide an effective strategy to design and synthesize the advanced electrode materials for lithium ion batteries. The doping strategy has dramatically increased the capacity retention from 74 % to 90% with a high discharge capacity of 251.2 mAhg− 1. 3 % RuO2-doped LiNi1/3Mn1/3Co1/3O2 cathode materials have showed the similar characteristics of two potential plateaus obtained at 2.8 and 4.2 V compared with un doped electrode cathode material. These results revealed the enhanced performance of RuO2- doped LiNi1/3Mn1/3Co1/3O2 during insertion and extraction of lithium ions compared to pristine material.

scholarly journals Synthesis and Characterization of Nanostructure Tio2/Anthraquenone (AQ) Prepared by Sol-Gel Method

2017 ◽  
Vol 28 (1) ◽  
pp. 76
Author(s):  
Fadhela M. Hussein
Keyword(s):  
Sol Gel ◽  
X Ray Diffraction ◽  
First Order ◽  
Atomic Force ◽  
Rate Of Reaction ◽  
Ft Ir ◽  
Gel Technique ◽  
Uv Visible ◽  
Nano Titanium Dioxide

sol–gel technique conducted to synthesize nano titanium dioxide with anthraquenone (AQ) relatively in acidic pH. Nanoparticles were characterized using techniques like, Scanning Electrion Microscope (SEM), Atomic Force Microscope (AFM), UV-Visible Spectrioscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR), SEM picture display that the TiO2/AQ is spherical in style, the band gap of TiO2/AQ nanoparticle is (3.05eV), BET and BJH analysis provides Pore volume and specific Surface area and the kinetic studie Suggest that the reaction is pseudo first order and the rate of reaction was reduce with rising initial concentration for p-Nitrotolune.

A Polyol Route LiFePO4 Cathode Material for Li-Batteries

2012 ◽  
Vol 584 ◽  
pp. 341-344
Author(s):  
Rasu Muruganantham ◽  
Rengapillai Subadevi ◽  
Marimuthu Sivakumar
Keyword(s):  
Cathode Material ◽  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Compositional Analysis ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Portable Electronics ◽  
Ft Ir ◽  
Battery Technology ◽  
Olivine Structure

Lithium ion battery technology has played a key role in portable electronics revolution, and it is vigorously pursued for electric vehicle applications. LiFePO4 has recently received a great deal of attention due to its potential usage as a next-generation cathode material for lithium-ion batteries such as power tools, electric vehicles (EVs)and hybrid electric vehicles (HEVs),etc.LiFePO4 is advantageous when comparing other conventional cathode materials such as LiCoO2, LiNiO2 and LiMn2O4, namely, it is inexpensive, environmentally benign and thermally stable, etc.. In the present work, LiFePO4 has been prepared using polyol method and its crystal structure has been confirmed by powder X-ray diffraction. The as-prepared LiFePO4 has olivine structure with space group Pnma and orthorhombic lattice parameters are calculated as a=10.3999Å, b=6.0070Å and c=4.6388Å. The functional group vibrations have been analyzed using Fourier Transform Infrared Spectroscopy (FT-IR). The surface morphology of synthesized material have been studied by scanning electron microscopy (SEM) and the compositional analysis were also been carried out through EDX analysis.

scholarly journals L-Leucine Templated Biomimetic Assembly of SnO2 Nanoparticles and Their Lithium Storage Properties

Scanning ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Peng Yu ◽  
Mili Liu ◽  
Haixiong Gong ◽  
Fangfang Wu ◽  
Zili Yi ◽  
...  
Keyword(s):  
Growth Regulation ◽  
Sno2 Nanoparticles ◽  
Sol Gel ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Lithium Storage ◽  
X Ray ◽  
Ft Ir ◽  
Storage Properties ◽  
High Calcination Temperature

SnO2 nanoparticles have been synthesized by a novel route of a sol-gel method assisted with biomimetic assembly using L-leucine as a biotemplate. The microstructure of as-prepared SnO2 nanoparticles was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR), and Brunner−Emmet−Teller (BET) measurements. The results demonstrated that the growth of SnO2 could be regulated by L-leucine at a high calcination temperature. The electrochemical performance of SnO2 was also measured as anodes for lithium-ion battery. It is a guidance for the growth regulation of SnO2 at high temperature to obtain SnO2/C with nanosized SnO2 coated by a graphitic carbon.

Evaluation of Novel Nanophase Ce0.8Sr0.2Fe0.9Ir0.1O3-δ as Cathode Material for Low Temperature SOFC

2016 ◽  
Vol 44 ◽  
pp. 35-50 ◽  
Author(s):  
Chima Benjamin Njoku ◽  
Patrick Gathura Ndungu
Keyword(s):  
Electron Microscopy ◽  
Solid Oxide Fuel Cells ◽  
Cathode Material ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Low Temperature Sofc ◽  
Gel Technique ◽  
Perovskite Type ◽  
A Current

In this study, Ce0.8Sr0.2Fe0.9Ir0.1O3-δ (CSFI) perovskite type material was prepared by sol-gel technique, characterised, and then tested as a cathode material for solid oxide fuel cells operating between 300 – 500 °C. The materials were studied using X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The morphology was examined using scanning electron microscopy and high resolution transmission electron microscopy. Samples showed changes in the overall structure and defect chemistry with an increase in calcination temperature. When tested as cathode materials, the material calcined at 1000 °C had the greatest performance at a test temperature of 500 °C, with a current density of 774.47 mA/cm2, a power density of 483.07 mW/cm2 and an area specific resistance (ASR) of 0.342 Ω/cm2.

ELECTRORHEOLOGICAL BEHAVIOR OF NANOMETRIC POWDERS SUSPENSIONS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4952-4960
Author(s):  
ELŻBIETA ŻERO ◽  
IRENEUSZ WIELGUS ◽  
JANUSZ PŁOCHARSKI
Keyword(s):  
Electric Field ◽  
Sol Gel ◽  
Scattering Method ◽  
X Ray Diffraction ◽  
Flow Curves ◽  
X Ray ◽  
Agglomeration Process ◽  
Ft Ir ◽  
Electrorheological Suspensions ◽  
Ft Ir Spectroscopy

The sol–gel method was used to prepare amorphous TiO 2 powders with sub-micrometric grain size. These powders together with commercial nanometric TiO 2 were characterized with FT-IR spectroscopy, X-ray diffraction, scanning electron microscopy, and a light scattering method. Then electrorheological suspensions were composed out of these powders and their flow curves under electric field were recorded. The ER activity of the synthesized powders was relatively high which probably resulted from residual amounts of polar organic matter present in the prepared titania. It was found, however, that the studied suspensions underwent a very well pronounced agglomeration process clearly observed in suspensions of higher concentrations and particularly in those fluids which were exposed to electric field for some time. Therefore, the studied ERFs which were originally prepared out of nanometric powders contain in fact aggregated particles of considerably bigger size. The agglomeration process strongly influences all basic properties of the studied electrorheological suspensions.

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