Effect of Synthesis Temperature on Structure and Electrochemical Properties of Nano-Sized Li4Ti5O12 by Self-Combustion Method

2011 ◽  
Vol 399-401 ◽  
pp. 1487-1490
Author(s):  
Zhi Yong Yu ◽  
Han Xing Liu
Keyword(s):  
Electrochemical Properties ◽  
Combustion Method ◽  
Synthesis Temperature ◽  
Electrochemical Analysis ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
X Ray ◽  
Initial Discharge ◽  
Pure Phase

The spinel-type Li4Ti5O12 cathode materials were synthesized by a self-combustion method. The effects of synthesis temperature on the structural and electrochemical properties of the Li4Ti5O12 were investigated. The prepared samples were characterized by X-ray diffraction (XRD), SEM, TEM and electrochemical analysis. The results revealed that pure phase and well-crystallized Li4Ti5O12 with nano-sized could be synthesized at a calcination temperature of 750°C. The sample prepared under the condition had the highest initial discharge capacity of 164 mAh/g and shown good capacity rentention during 50 cycles between 1.0-2.5V at 0.1C.

The Effect of CTAB Additive on Performance of Layered Cathode Material Li0.96Na0.04Ni1/3Co1/3Mn1/3O2

2013 ◽  
Vol 800 ◽  
pp. 501-504
Author(s):  
Chun Xia Gong ◽  
Oluwatosin Emmanued Bankole ◽  
Li Xu Lei
Keyword(s):  
Cathode Material ◽  
Cycle Performance ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Electrochemical Test ◽  
Capacity Retention ◽  
X Ray ◽  
Initial Discharge ◽  
Pure Phase ◽  
Scanning Electron

Li0.96Na0.04Ni1/3Co1/3Mn1/3O2with CTAB as additive was synthesized. X-ray diffraction pattern reveals the product of the material with CTAB is pure phase. Scanning electron microscopy shows that the powders are average of 200 nm. Electrochemical test shows it in terms of high initial discharge capacity (175.6 mAhg-1) and exhibits good cycle performance with the capacity retention of 93.39 % after 90 cycles compared to the material has no additive (167.6 mAhg-1and 71.18 %) at 0.1 C rate. Therefore, CTAB as additive should improve the performance of Li0.96Na0.04Ni1/3Co1/3Mn1/3O2cathode material.

Effect of Synthesis Conditions on the Structure and Electrochemical Properties of LiNi1/2Mn1/2O2 by Sol Gel Method

2011 ◽  
Vol 399-401 ◽  
pp. 1447-1450
Author(s):  
Zhi Yong Yu ◽  
Han Xing Liu
Keyword(s):  
Electrochemical Properties ◽  
Sol Gel ◽  
Electrochemical Analysis ◽  
X Ray Diffraction ◽  
Capacity Fading ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Synthesis Conditions ◽  
A Current

The layered LiNi1/2Mn1/2O2 cathode materials were synthesized by a sol gel method. The effects of calcination temperature and time on the structural and electrochemical properties of the LiNi1/2Mn1/2O2 were investigated. The prepared samples were characterized by X-ray diffraction (XRD) and electrochemical analysis. The results revealed that the layered LiNi1/2Mn1/2O2 material could be optimal synthesized at temperature of 900°C for 10h. The sample prepared under the above conditions has the highest initial discharge capacity of 151 mAh/g and showed no dramatic capacity fading during 20 cycles between 2.5-4.5V at a current rate of 20mA/g.

The Preparation and Characterization of LiFe0.98Ni0.01Nb0.01PO4/C by Carbon Reduction Route

2012 ◽  
Vol 581-582 ◽  
pp. 570-573
Author(s):  
Jia Feng Zhang ◽  
Bao Zhang ◽  
Xue Yi Guo ◽  
Jian Long Wang ◽  
He Zhang Chen ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Xrd Analysis ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
X Ray ◽  
Carbon Reduction ◽  
Initial Discharge ◽  
Structure Morphology

The LiFe0.98Ni0.01Nb0.01PO4/C was synthesized by carbon reduction route using FePO4•2H2O as precursor. The LiFe0.98Ni0.01Nb0.01PO4/C sample was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical measurements. The XRD analysis, SEM and TEM images show that sample has the good crystal structure, morphology and carbon coating. The charge-discharge tests demonstrate that the powder has the better electrochemical properties, with an initial discharge capacity of 164.6 mAh•g−1 at current density of 0.1 C. The capacity retention reaches 99.8% after 100 cycles at 0.1C.

Effects of Synthesis Temperature and Holding Time on the Electrochemical Properties of LiNi1/3Co1/3Mn1/3O2 Cathode Material Using Rheological Phase Method

2015 ◽  
Vol 814 ◽  
pp. 351-357 ◽  
Author(s):  
Hui Peng ◽  
Ze Hua Zhu ◽  
Peng Xiao Huang ◽  
Xing Li
Keyword(s):  
Electrochemical Performance ◽  
Synthesis Temperature ◽  
Holding Time ◽  
Phase Method ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
Rheological Phase Reaction ◽  
X Ray ◽  
Initial Discharge

In this paper, LiNi1/3Co1/3Mn1/3O2 was prepared via a facile rheological phase reaction method. The effect of synthesis temperature and holding time on its electrochemical performance has been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) tests and galvanostatic charge–discharge tests. The results suggest that the synthesis temperature and holding time greatly affect the electrochemical performance of the LiNi1/3Co1/3Mn1/3O2 and the optimized synthesis condition for the synthesis of LiNi1/3Co1/3Mn1/3O2 via rheological phase reaction method is 900 °C for 8 h. The obtained sample possesses a highly ordered layered structure and low cation mixing. It delivers an initial discharge capacity of 198 mAh g-1 at 0.2 C and 140 mAh g-1 at 1.0 C between 2.5 and 4.6 V, respectively.

scholarly journals Structural, Optical, and Catalytic Properties of MgCr2O4 Spinel-Type Nanostructures Synthesized by Sol–Gel Auto-Combustion Method

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1476
Author(s):  
Vasyl Mykhailovych ◽  
Andrii Kanak ◽  
Ştefana Cojocaru ◽  
Elena-Daniela Chitoiu-Arsene ◽  
Mircea Nicolae Palamaru ◽  
...  
Keyword(s):  
Tartaric Acid ◽  
Catalytic Properties ◽  
Spinel Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
Temperature Treatment ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
X Ray ◽  
Auto Combustion

Spinel chromite nanoparticles are prospective candidates for a variety of applications from catalysis to depollution. In this work, we used a sol–gel auto-combustion method to synthesize spinel-type MgCr2O4 nanoparticles by using fructose (FS), tartaric acid (TA), and hexamethylenetetramine (HMTA) as chelating/fuel agents. The optimal temperature treatment for the formation of impurity-free MgCr2O4 nanostructures was found to range from 500 to 750 °C. Fourier transform infrared (FTIR) spectroscopy was used to determine the lattice vibrations of the corresponding chemical bonds from octahedral and tetrahedral positions, and the optical band gap was calculated from UV–VIS spectrophotometry. The stabilization of the spinel phase was proved by X-ray diffraction (XRD) and energy-dispersive X-ray (EDX) analysis. From field-emission scanning electron microscopy (FE-SEM), we found that the size of the constituent particles ranged from 10 to 40 nm. The catalytic activity of the as-prepared MgCr2O4 nanocrystals synthesized by using tartaric acid as a chelating/fuel agent was tested on the decomposition of hydrogen peroxide. In particular, we found that the nature of the chelating/fuel agent as well as the energy released during the auto-combustion played an important role on the structural, optical, and catalytic properties of MgCr2O4 nanoparticles obtained by this synthetic route.

scholarly journals Synthesis and electrochemical performance of Li2Co1− x M x PO4F (M = Fe, Mn) cathode materials

2013 ◽  
Vol 4 ◽  
pp. 860-867 ◽  
Author(s):  
Nellie R Khasanova ◽  
Oleg A Drozhzhin ◽  
Stanislav S Fedotov ◽  
Darya A Storozhilova ◽  
Rodion V Panin ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Single Phase ◽  
High Energy ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Energy Materials ◽  
X Ray ◽  
High Energy Materials ◽  
Initial Discharge ◽  
Scanning Electron

In the search for high-energy materials, novel 3D-fluorophosphates, Li2Co1− x Fe x PO4F and Li2Co1− x Mn x PO4F, have been synthesized. X-ray diffraction and scanning electron microscopy have been applied to analyze the structural and morphological features of the prepared materials. Both systems, Li2Co1− x Fe x PO4F and Li2Co1− x Mn x PO4F, exhibited narrow ranges of solid solutions: x ≤ 0.3 and x ≤ 0.1, respectively. The Li2Co0.9Mn0.1PO4F material demonstrated a reversible electrochemical performance with an initial discharge capacity of 75 mA·h·g−1 (current rate of C/5) upon cycling between 2.5 and 5.5 V in 1 M LiBF4/TMS electrolyte. Galvanostatic measurements along with cyclic voltammetry supported a single-phase de/intercalation mechanism in the Li2Co0.9Mn0.1PO4F material.

scholarly journals The Effect of Carbon Doping on Electrochemical Properties of LiFePO4/C Powders Prepared by Spray Pyrolysis

2011 ◽  
Vol 485 ◽  
pp. 107-110 ◽  
Author(s):  
Takayuki Kodera ◽  
Dong Ying Bi ◽  
Daisuke Ogawa ◽  
Takashi Ogihara
Keyword(s):  
Spray Pyrolysis ◽  
Glycolic Acid ◽  
Carbon Sources ◽  
Carbon Doping ◽  
Initial Discharge Capacity ◽  
Cycle Stability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Discharge ◽  
Precursor Powders

Spherical LiFePO4/C precursor powders were successfully prepared by spray pyrolysis. Various types of organic compounds such as glycolic acid, malic acid, citric acid, fructose and sucrose were used as carbon sources. X-ray diffraction analysis revealed that the olivine phase was obtained by calcining over 600 °C under an argon (95%)/hydrogen (5%) atmosphere. The particles exhibited a spherical morphology with approximately 1.5 μm. LiFePO4/C cathode derived from sucrose exhibited higher rechargeable capacity and cycle stability. The rechargeable capacity of LiFePO4/C cathode was approximately 154 mAh/g at 1 C. 90% of initial discharge capacity was maintained after 100 cycles.

Synthesis and Characterization of Ramsdellite Type Lithium Titanate Anode Materials by Spray Pyrolysis

2013 ◽  
Vol 566 ◽  
pp. 127-130
Author(s):  
Hiroshi Kawaguchi ◽  
Takayuki Kodera ◽  
Takashi Ogihara
Keyword(s):  
Spray Pyrolysis ◽  
Discharge Capacity ◽  
Anode Materials ◽  
Lithium Titanate ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Discharge ◽  
Precursor Powders

Spherical Li2Ti3O7precursor powders were successfully prepared by spray pyrolysis. X-ray diffraction analysis revealed that the ramsdellite phase was obtained by calcining at 1100 °C for 3 h under an argon/hydrogen (95/5 %) atmosphere. The Li2Ti3O7anode exhibited higher rechargeable capacity and excellent cycle stability. The rechargeable capacity of the Li2Ti3O7anode was approximately 168 mAh/g at 0.1 C. The discharge capacity of the Li2Ti3O7anode after 100 cycles was approximately 90% of the initial discharge capacity.

Synthesis and Electrochemical Performance of Li3V2(PO4)3 Cathode Material by Microwave Method

2012 ◽  
Vol 490-495 ◽  
pp. 3624-3627
Author(s):  
Sheng Kui Zhong ◽  
Hui Ping Hu ◽  
Jie Qun Liu
Keyword(s):  
Perfect Crystal ◽  
Microwave Method ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Voltage Range ◽  
X Ray ◽  
Initial Discharge ◽  
Charge Discharge ◽  
Discharge Test

Monoclinic Li3V2(PO4)3 was synthesized by a microwave method. The influence of sintering temperatures and time on the synthesis of Li3V2(PO4)3 was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and charge-discharge test. The results of these tests shows that the Li3V2(PO4)3 sample synthesized at 850 °C for 15 min has pure and perfect crystal. The charge-discharge test shows the Li3V2(PO4)3 sample with optimal synthesis condition has the best initial discharge capacity of 120 mAh/g, with capacity retention of 101 mAh/g after 50 cycles, in the voltage range of 3.0 V–4.2 V.

Influences of Re-Sintering on the Structure and Electrochemical Performance of LiNi1/3Co1/3Mn1/3O2

2013 ◽  
Vol 669 ◽  
pp. 355-359
Author(s):  
Li Yuan ◽  
Yun Zhang ◽  
Wen Jing Liu ◽  
Fu Wang ◽  
Chao Lu
Keyword(s):  
Crystal Structure ◽  
Electrochemical Performance ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Time ◽  
Initial Discharge ◽  
Coulomb Efficiency ◽  
Increasing Temperature ◽  
Synthesized Materials

The influences of re-sintering on the structure and electrochemical performance of LiNi1/3Co1/3Mn1/3O2 were researched in this paper. The synthesized materials were characterized and tested by means of X-ray diffraction (XRD) and electrochemical measurements respectively. It was found that the re-sintered samples with better well-ordered layered structure, more perfect crystallization and more complete crystal structure will be formed with increasing temperature. Moreover, reasonable re-sintering time was required. The materials re-sintered at 860°C for 2h exhibited the best electrochemical performance, including high initial discharge capacity of 150.6 mAh•g-1 and coulomb efficiency of 84% at 0.2C rate.

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