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.

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.

LiFePO4/C Cathode Materials Prepared by One-Step Fast Carbothermal Method Using Fe2O3 as Raw Materials

2013 ◽  
Vol 773 ◽  
pp. 709-713
Author(s):  
Bao Hua Rong ◽  
Yan Wen Lu ◽  
Qing Lin Chen ◽  
Kun Tang ◽  
Xue Wen Liu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Raw Materials ◽  
Synthesis Temperature ◽  
Cycle Performance ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Sintering Atmosphere ◽  
X Ray ◽  
One Step ◽  
Carbothermal Method

LiFePO4/C was successfully synthesized by one-step solid-state reaction using Fe2O3, LiH2PO4 and sucrose as raw materials. The effect of synthesis temperature and sintering atmosphere on the electrochemical performance were investigated. LiFePO4/C materials were characterized by differential scanning calorimetry and thermogravimetry, X-ray diffraction, scanning electron microscopy and XPS. The results show that the synthesis temperature between 750 °C and 800 °C were appropriate and the reductive ambience can enhance the electrochemical performance effectively especially at high rates. The precursor calcined at 750°C for 5h in a N2+5%H2 atmosphere exhibited the highest discharge capacity of 155 mAh/g at 0.1C and 141 mAh/g at 1C and showed the best cycle performance.

Synthesis of α-Al2O3 Nanopowder From Ammonium Dawsonite

2008 ◽  
Author(s):  
P. Ahmadian Namini ◽  
A. A. Babaluo ◽  
M. Akhfash Ardestani ◽  
E. Jannatduost ◽  
M. Peyravi
Keyword(s):  
Phase Reaction ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
Wet Chemistry ◽  
X Ray ◽  
Alumina Nanopowder ◽  
Α Al2o3 ◽  
Liquid Phase Reaction ◽  
Scanning Electron

In this research, α-Al2O3 nanopowder was successfully synthesized via a new wet chemistry (liquid phase reaction) method. Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the characterization of the synthesized nanopowder. The FTIR and XRD results showed that α-alumina nanopowder was synthesized from ammonium dowsonite powder after the calcination at 1150 °C for 1 h. Also, SEM micrographs showed that the final nanoparticles have aggregated structures in 50–100 nm range.

PREPARATION AND STRUCTURAL CHARACTERIZATION OF NANOCRYSTALLINE Zn–Cu–Cr FERRITES WITH Gd SUBSTITUTION

2010 ◽  
Vol 24 (27) ◽  
pp. 5409-5416 ◽  
Author(s):  
JING JIANG ◽  
CHAOCHAO CHEN ◽  
LUNHONG AI
Keyword(s):  
Fourier Transform ◽  
Spinel Structure ◽  
Remanent Magnetization ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Magnetic Parameters ◽  
The Fourier Transform

Nanocrystalline spinel Zn – Cu – Cr ferrites with Gd substitution were prepared by a rheological phase reaction method. By means of the Fourier transform infrared (FTIR) spectra, Raman spectra, and X-ray diffraction (XRD), the cubic spinel structure of samples had been confirmed. The magnetic parameters such as saturation magnetization, remanent magnetization and coercivity can be tailored by controlling the content of substituting Gd ions.

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 Rheological phase reaction synthesis and electrochemical performance of rufigallol anode for lithium ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (34) ◽  
pp. 19272-19277 ◽  
Author(s):  
Xiaoyan Han ◽  
Guanyu Lin ◽  
Qing Zhang ◽  
Yingkui Yang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
High Yield ◽  
Phase Method ◽  
Reaction Synthesis ◽  
Phase Reaction ◽  
Rheological Phase Reaction ◽  
Rheological Phase Method

Rufigallol was synthesized by rheological phase method with high yield and investigated as anode for lithium ion batteries.

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.

Preparation of Coated CMC-nZVI Using Rheological Phase Reaction Method and Research on Degradation of Chloroform in Water

2016 ◽  
Vol 847 ◽  
pp. 230-233 ◽  
Author(s):  
Shu Zhen Yu ◽  
Yue Cheng ◽  
Xiao Feng Fan ◽  
Li Ping Xu
Keyword(s):  
Removal Rate ◽  
Reaction Rate Constant ◽  
Order Kinetic ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
Rheological Phase Reaction ◽  
Transmission Electron ◽  
Simulated Groundwater ◽  
Apparent Reaction Rate Constant

This study reported the synthesis of nanoscale zero-valent iron (nZVI) by rheological phase reaction method in the presence of sodium (CMC). The synthesized CMC coated nZVI (CMC-nZVI) was then characterized with x-ray diffraction (XRD) and transmission electron microscope (TEM) and was tested for the removal of chloroform from simulated groundwater. The investigated parameters in the uptake experiments included different adsorbents, initial concentrations of chloroform and different water flow. The results show that:(1) the prepared CMC-nZVI has good stability and dispersibility; (2) when the concentration of chloroform is 0.1 mg/L, the dosage of CMC-Fe0 is 0.01 g, the removal rate of chloroform is 91.2%;(3)The reaction follows the first-order kinetic reaction equation, and the apparent reaction rate constant increases with decreasing the concentration of chloroform.

Preparation of LiBOB via rheological phase method and its application to mitigate voltage fade of Li1.16[Mn0.75Ni0.25]0.84O2 cathode

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86763-86770 ◽  
Author(s):  
Fang Lian ◽  
Yang Li ◽  
Yi He ◽  
Hongyan Guan ◽  
Kun Yan ◽  
...  
Keyword(s):  
High Purity ◽  
Phase Method ◽  
Phase Reaction ◽  
Electrolyte Additive ◽  
Reaction Method ◽  
Rheological Phase Reaction ◽  
Rheological Phase Method ◽  
Voltage Fade

High-purity LiBOB, synthesized via novel rheological phase reaction method without further recrystallization, mitigated voltage-fade of Li-rich cathode as electrolyte additive.

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