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.

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.

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 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.

PL Properties of (Ba, Ca)2( Si, P)O4: Eu Synthesized by Various Annealing and Cooling Process

2021 ◽  
Vol 1016 ◽  
pp. 231-235
Author(s):  
Shota Ando ◽  
Hiromi Nakano ◽  
Koichiro Fukuda
Keyword(s):  
Crystal Structure ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Slow Cooling ◽  
X Ray ◽  
Host Materials ◽  
Emission Color ◽  
Increasing Temperature ◽  
X Ray Absorption ◽  
Color Emission

We have been investigating the series of P doped Ca2SiO4 (C2S) using Eu2+ or Eu3+ as activator with various colors. The crystal structure of C2S is particularly easily controlled by heating because the established polymorphs of C2S are, in the order of increasing temperature, γ, β, α’L, α’H, and α. In order to control the crystal structure, the phosphors were synthesized and then annealed at temperatures 1473 K-1773 K. The crystal structures and PL properties were compared between slow cooling and quenching (cooled in water). We found unique phenomena when the phosphors were treated by quenching process. In the case of (Ba1-xCax)2(Si0.94P0.06)O4:Eu3+ ( 0.25 ≤ x ≤ 1), color emission changed from red to blue-white for the phosphor with a high concentration of Ba and quenched at 1773 K. In general, Eu3+ doped phosphors showed the red emission color in any host materials. However, Ba-included and quenched-treatment phosphors emitted a bright white color. The mechanism and relationship between the PL property and crystal structure were characterized carefully using X-ray diffraction, electron microscope and X-ray absorption fine structure.

scholarly journals Promising solid electrolyte material for an IT-SOFC: crystal structure of the cerium gadolinium holmium oxide Ce0.8Gd0.1Ho0.1O1.9 between 295 and 1023 K

2018 ◽  
Vol 74 (2) ◽  
pp. 236-239 ◽  
Author(s):  
Sri Rahayu ◽  
Jennifer S. Forrester ◽  
Girish M. Kale ◽  
Mojtaba Ghadiri
Keyword(s):  
Crystal Structure ◽  
Solid Oxide Fuel Cells ◽  
Solid Electrolyte ◽  
Sol Gel ◽  
Fluorite Structure ◽  
Sodium Ion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Increasing Temperature ◽  
Co Doped

The crystal structure of Ce0.8Gd0.1Ho0.1O1.9 (cerium gadolinium holmium oxide) has been determined from powder X-ray diffraction data. This is a promising material for application as a solid electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Nanoparticles were prepared using a novel sodium alginate sol-gel method, where the sodium ion was exchanged with ions of interest and, after washing, the gel was calcined at 723 K in air. The crystallographic features of Gd and Ho co-doped cerium oxide were investigated around the desired operating temperatures of IT-SOFCs, i.e. 573 ≤ T ≤ 1023 K. We find that the crystal structure is a stable fluorite structure with the space group Fm\overline{3}m in the entire temperature range. In addition, the trend in lattice parameters shows that there is a monotonic increase with increasing temperature.

Crystal structure of adamite at high temperature

2016 ◽  
Vol 80 (5) ◽  
pp. 901-914 ◽  
Author(s):  
M. Zema ◽  
S. C. Tarantino ◽  
M. Boiocchi ◽  
A. M. Callegari
Keyword(s):  
Crystal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Expansion ◽  
Cell Parameters ◽  
Temperature Range ◽  
Linear Evolution ◽  
Thermal Expansion Coefficients ◽  
Different Temperatures ◽  
Increasing Temperature

AbstractStructural modifications with temperature of adamite, Zn2(AsO4)(OH), were determined by single-crystal X-ray diffraction up to dehydration and collapse of the crystal structure. In the temperature range 25–400°C, adamite shows positive and linear expansion. Axial thermal expansion coefficients, determined over this temperature range, are αa = 1.06(2) × 10–5 K–1, αb = 1.99(2) × 10–5 K–1, αc = 3.7(1) × 10–6 K–1 and αV = 3.43(3) × 10–5 K–1. Axial expansion is then strongly anisotropic with αa:αb:αc = 2.86: 5.38 : 1. Structure refinements of X-ray diffraction data collected at different temperatures allowed us to characterize the mechanisms by which the adamite structure accommodates variations in temperature. Expansion is limited mainly by edge sharing Zn(2) dimers along a and by edge sharing Zn(1) octahedra chains along c; on the other hand, connections of polyhedra along b, the direction of maximum expansion, is governed by corner sharing. Increasing temperature induces mainly an axial expansion of Zn(1) octahedron, which becomes more elongated, and no significant variations of the Zn(2) trigonal bipyramids and As tetrahedra. Starting from 400°C, deviation from a linear evolution of unit-cell parameters is observed, associated with some deterioration of the crystal, a sign of incipient dehydration. The process leads to the formation of Zn4(AsO4)2O.

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.

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