scholarly journals Synthesis and characterization of Li2MnO3 nanoparticles using sol-gel technique for lithium ion battery

2020 ◽  
Vol 38 (2) ◽  
pp. 312-319
Author(s):  
Sandhiya Chennakrishnan ◽  
Venkatachalam Thangamuthu ◽  
Akshaya Subramaniyam ◽  
Viknesh Venkatachalam ◽  
Manikandan Venugopal ◽  
...  
Keyword(s):  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Xrd Analysis ◽  
Decomposition Temperature ◽  
Manganese Acetate ◽  
Cyclic Voltammogram ◽  
Stoichiometric Ratio ◽  
Charging And Discharging Processes ◽  
Agglomeration Of Nanoparticles

AbstractNanoparticles of Li2MnO3 were fabricated by sol-gel method using precursors of lithium acetate and manganese acetate, and citric acid as chelating agent in the stoichiometric ratio. TGA/DTA measurements of the sample in the regions of 30 °C to 176 °C, 176 °C to 422 °C and 422 °C to 462 °C were taken to identify the decomposition temperature and weight loss. The XRD analysis of the sample indicates that the synthesized material is monoclinic crystalline in nature and the calculated lattice parameters are 4.928 Å (a), 8.533 Å (b), and 9.604 Å (c). The surface morphology, particle size and elemental analysis of the samples were observed using SEM and EDAX techniques and the results confirmed the agglomeration of nanoparticles and, as expected, Li2MnO3 composition. Half cells of Li2MnO3 were assembled and tested at C/10 rate and the maximum capacity of 27 mAh/g was obtained. Charging and discharging processes that occurred at 3 V and 4 V were clearly observed from the cyclic voltammetric experiments. Stability of the electrodes was confirmed by the perfect reversibility of the anodic and cathodic peak positions observed in the cyclic voltammogram of the sample. The Li2MnO3 nanoparticles exhibit excellent properties and they are suitable for cathode materials in lithium ion batteries.

GLYCINE-ASSISTED SOL–GEL SYNTHESIS OF LiFePO4/C CATHODE MATERIALS FOR LITHIUM-ION BATTERIES

2010 ◽  
Vol 03 (03) ◽  
pp. 217-221 ◽  
Author(s):  
SHIGUANG HU ◽  
TIANJING ZHANG ◽  
HUJUN CAO ◽  
HONGMEI ZHANG ◽  
ZHAOHUI LI ◽  
...  
Keyword(s):  
Calcination Temperature ◽  
Discharge Capacity ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Cyclic Voltammogram ◽  
Good Crystallinity ◽  
Sol Gel Process ◽  
Xrd Patterns ◽  
Sol Gel Synthesis

Glycine was firstly used as a chelating agent to prepare LiFePO4/C cathodes by the sol–gel process and sucrose as carbon source. The effects of calcination temperature on properties of LiFePO4/C cathode were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD), galvanostatic charge-discharge and cyclic voltammogram (CV) respectively. The XRD patterns indicate that all samples were of good crystallinity. The primary particle size increased with the calcination temperature from 600 to 750°C. The LiFePO4/C sample synthesized at 700°C has the best electrochemical performance with an initial discharge capacity of 162.6 mAh g-1 at 0.1 C and the discharge capacity remains at 154.6 mAh g-1 after 50 cycles.

DIRECT CONTACT SHIELD OF LiMn2O4 ACTIVE MATERIAL FROM ELECTROLYTE

2010 ◽  
Vol 17 (01) ◽  
pp. 81-86 ◽  
Author(s):  
MYOUNG HYE CHANG ◽  
CHANG WOO LEE
Keyword(s):  
Electrochemical Performance ◽  
Pure Aluminum ◽  
Sol Gel ◽  
Active Material ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Current Collector ◽  
Aluminum Foil ◽  
Manganese Acetate ◽  
Thermal Environments

The spinel LiMn 2 O 4 powders were prepared by sol–gel technique using lithium acetate ( Li ( CH 3 COO ) · 2 H 2 O ) and manganese acetate ( Mn ( CH 3 COO )2 · 4 H 2 O ) as starting materials, citric acid as a chelating agent, and acrylamide as a gel formatting agent. In order to improve the electrochemical performance of lithium ion batteries and prevent structural disintegration from Mn dissolution generated by undesirable acid production, conductive agents were additionally coated on the surface of active material coated on pure aluminum foil as a current collector. Also, it was comparatively investigated using different conductive agents with different particle sizes as well as adopting the cells into the different thermal environments. The electrochemical performance of the Li/LiMn 2 O 4 cells demonstrated that the spinel LiMn 2 O 4 might be effectively shielded from acid, resulting in improved electrochemical capacity characteristics at room temperature as well as elevated temperature of 55°C.

THE EFFECTS OF CARBON NANO-COATING ON Li(Ni0.8Co0.15Al0.05)O2 CATHODE MATERIAL USING ORGANIC CARBON FOR Li-ION BATTERY

2010 ◽  
Vol 17 (01) ◽  
pp. 51-58 ◽  
Author(s):  
JEONG-HUN JU ◽  
YOUNG-MIN CHUNG ◽  
YU-RIM BAK ◽  
MOON-JIN HWANG ◽  
KWANG-SUN RYU
Keyword(s):  
Cathode Material ◽  
Coating Layer ◽  
Sol Gel ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Cyclic Voltammogram ◽  
Active Materials ◽  
Nano Coating ◽  
Primary Particles ◽  
Li Ion

Carbon nano-coated LiNi 0.8 Co 0.15 Al 0.05 O 2/ C (LNCAO/C) cathode-active materials were prepared by a sol–gel method and investigated as the cathode material for lithium ion batteries. Electrochemical properties including the galvanostatic charge–discharge ability and cyclic voltammogram behavior were measured. Cyclic voltammetry (2.7–4.8 V) showed that the carbon nano-coating improved the "formation" of the LNCAO electrode, which was related to the increased electronic conductivity between the primary particles. The carbon nano-coated LNCAO/C exhibited good electrochemical performance at high C -rate. Also, the thermal stability at a highly oxidized state of the carbon nano-coated LNCAO was remarkably enhanced. The carbon nano-coating layer can serve as a physical and/or (electro-)chemical protection shell for the underlying LNCAO, which is attributed to an increase of the grain connectivity (physical part) and also to the protection of metal oxide from chemical reactions (chemical part).

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.

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.

scholarly journals Characterization of LiCo Nanopowders Produced by Sol-Gel Processing

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Sina Soltanmohammad ◽  
Sirous Asgari
Keyword(s):  
Thermal Analyses ◽  
Sol Gel ◽  
Lithium Ion ◽  
Chelating Agent ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Size And Morphology ◽  
Gel Processing

LiCo nanopowders, one of the most important cathode materials for lithium-ion batteries, were synthesized via a modified sol-gel process assisted with triethanolamine (TEA) as a complexing agent. The influence of three different chelating agents including acrylic acid, citric acid, and oxalic acid on the size and morphology of particles was investigated. Structure and morphology of the synthesized powders were characterized by thermogravimetric/differential thermal analyses (TG/DTA), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Results indicate that the powder processed with TEA and calcinated at 800 had an excellent hexagonal ordering of -NaFe-type (space group Rm). Also, the other three complexing agents had a decisive influence on the particle size, shape, morphology, and degree of agglomeration of the resulting oxides. Based on the data presented in this work, it is proposed that the optimized size and distribution of LiCo powders may be achieved through sol-gel processing using TEA as a chelating agent.

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.

A Review of Potential Ferrous Metal Lathe Waste as A Raw Material of LiFePO4

2021 ◽  
Vol 1044 ◽  
pp. 41-58
Author(s):  
Valiana Mugi Rahayu ◽  
Reynaldi Virgiawan Rifki Pradana ◽  
Yudi Eka Fahroni ◽  
Muhamad Iqbal Putra ◽  
Cornelius Satria Yudha ◽  
...  
Keyword(s):  
Sol Gel ◽  
Ferrous Metal ◽  
Lithium Ion ◽  
Recovery Process ◽  
Xrd Analysis ◽  
Lattice Parameter ◽  
Three Dimensions ◽  
Raw Material ◽  
Synthesis Process ◽  
Battery Capacity

Lathe waste is one of the wastes products of metal processing in the metal-turning industry. The most content of lathe waste is a ferrous (Fe) metal, which, if disposed of into the environment, can cause environmental pollution. Fe metal from lathe waste can be used as a Fe precursor in LiFePO4 synthesis. The extraction of Fe from the lathe waste can be done by the leaching method using acid as the leaching agent. The recovered compounds have great potential to be used as Fe precursors for the LiFePO4 synthesis. The selection of leaching agent was based on considerations of the price, the effectiveness of Fe extraction, and the advanced recovery process from Fe extraction. The LiFePO4 synthesis process can be carried out using co-precipitation, hydrothermal, and sol-gel. LiFePO4 material characterization was carried out to test the yield of the material produced. Synthesized materials were done to test the characteristics by Scanning Electron Microscopy (SEM) and X-Ray Diffractometer (XRD) analysis. SEM analysis aims to describe the shape and particle size of the material in three dimensions. Meanwhile, XRD analysis aims to characterize the material's crystal structure and crystal size by using the Lattice Parameter value. The electrochemical test aims to test electrochemistry to test the capacity of charge/discharge, efficiency, and lithium-ion batteries' stability. The resulting battery capacity from the three methods is close to the theoretical capacity of LiFePO4, which is 170 mAh/g.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF Fe2O3 NANOPARTICLES USING Averrhoa bilimbi AS BIOMATERIAL CHELATING AGENT FOR NANOFLUIDS APPLICATION

2017 ◽  
Vol 13 (2) ◽  
pp. 133 ◽  
Author(s):  
Arie Hardian ◽  
Alvi Aristia Ramadhiany ◽  
Dani Gustaman Syarif ◽  
Senadi Budiman
Keyword(s):  
Calcination Temperature ◽  
Sol Gel ◽  
Chelating Agent ◽  
Xrd Analysis ◽  
Solid Particles ◽  
X Ray Diffraction ◽  
Calcination Temperatures ◽  
Basic Fluid ◽  
Sol Gel Synthesis

<p>The aim of this work was to determine the effect of calcination temperature on the characteristics of Fe<sub>2</sub>O<sub>3</sub> nanoparticles (NPs) in sol-gel synthesis. The obtained Fe<sub>2</sub>O<sub>3 </sub>NPs was then used as material for preparation of Fe<sub>2</sub>O<sub>3</sub>-water nanofluids. Nanofluids is a mixture between basic fluid like water and 1 - 100 nm solid particles (nanoparticles). Nanoparticles of Fe<sub>2</sub>O<sub>3</sub> have been synthesized from the local mineral Jarosite using sol-gel method by using starfruit (<em>Averrhoa bilimbi</em>) extracts as the chelating agent. The calcination temperature was then varied from 500 ºC to 700 ºC for 5 hours. Based on the X-Ray Diffraction (XRD) analysis, the diffraction pattern of obtained Fe<sub>2</sub>O<sub>3</sub> was relevant with the JCPDS data No. 33-0664 for α-Fe<sub>2</sub>O<sub>3 </sub>with hexagonal crystallite system. The crystallite size (Scherrer’s Equation) of obtained α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles at calcination temperatures of 500 ºC, 600 ºC and 700 ºC was 50 nm, 48 nm and 40 nm, respectively. The Surface Area of Fe<sub>2</sub>O<sub>3</sub> NPs at temperature of 500 ºC, 600 ºC and 700 ºC was 45.45 m<sup>2</sup>/g; 26.91 m<sup>2</sup>/g and 17.51 m<sup>2</sup>/g, respectively. Fe<sub>2</sub>O<sub>3</sub>-water nanofluids was relativly stable with zeta potential of -39.60 mV; -46.37 mV and -41.57 mV, respectively for 500 ºC, 600 ºC and 700 ºC calcination temperature. The viscosity of Fe<sub>2</sub>O<sub>3</sub>-water nanofluids was higher than the viscosity of water. The critical heat flux (CHF) value of water-Fe<sub>2</sub>O<sub>3</sub> nanofluids was higher than the CHF water. The highest CHF value for nanofluids was obtained by using α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles with calcination temperature of 600 ºC which 34.99 % of increment compare to the base fluid (water).</p>

scholarly journals Influence of type of precursors on the sol-gel synthesis of the LaCoO3 nanoparticles

2014 ◽  
Vol 22 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Nicoleta Cornei ◽  
Simona Feraru ◽  
Ion Bulimestru ◽  
Andrei Victor Sandu ◽  
Carmen Mita
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Chelating Agent ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Synthesis ◽  
Perovskite Type ◽  
Type Crystal ◽  
Scanning Electron

Abstract Perovskite-type LaCoO3 was prepared by sol-gel method using nitrates / chlorides as precursors and citric acid as chelating agent. Chemical composition was obtained by means of EDX method. The structures of sintered samples were investigated by scanning electron microscopy (SEM), IR and XRD analysis. The results of X-ray diffraction indicated that the LaCoO3nanopowders obtained using nitrate as precursors had a rhombohedral perovskite-type crystal structure (S. G: R-3c), while that obtained using chloride as precursors had a mixture of LaCoO3, LaOCl and Co3O4. The all lanthanum cobaltites exhibit catalytic activity on the decomposition of hydrogen peroxide, ascribed to their higher surface and Co3+ concentration

Sign in / Sign up

Export Citation Format

Share Document