Structure, Morphology and Electrochemical Characteristics of Na x MnO2 (x = 0.44, 0.67 and 0.8) as Cathode Materials for Na-Ion Batteries

2021 ◽  
Vol 105 (1) ◽  
pp. 199-207
Author(s):  
Yurii V. Shmatok ◽  
Vitalii A. Sirosh ◽  
Nataliya I. Globa
Keyword(s):  
Crystal Structure ◽  
Specific Capacity ◽  
Oxide Phase ◽  
Sodium Content ◽  
Electrolyte Composition ◽  
Electrochemical Characteristics ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Structure Morphology ◽  
The Stability

The paper presents the results of the investigations of structural, morphological and electrochemical characteristics of Na x MnO2 (x = 0.44, 0.67 and 0.8) .It is shown that the crystal structure of the resulting materials is determined by the sodium content and is tunnel in a case of Na0.44MnO2 and layered in a case of Na0.67MnO2 and Na0.8MnO2. In addition, the materials obtained are characterized by different morphology. The initial discharge capacity of the materials obtained increases with the increase of sodium content in oxide phase and is 117, 139 and 151 mAh/g for Na0.44MnO2, Na0.67MnO2 and Na0.8MnO2, respectively, however, at the same time the stability of the specific capacity decreases. Using Na0.44MnO2 as an example, the effect of the electrolyte composition, in particular the presence of FEC, on its electrochemical characteristics is shown.

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.

Synthesis and Characterization of Nano Mn3O4 for Lithium-Ion Batteries

2014 ◽  
Vol 687-691 ◽  
pp. 4331-4334
Author(s):  
Han Ping Zhu ◽  
Peng Ding ◽  
Song Fang ◽  
Hailin Liu
Keyword(s):  
Discharge Capacity ◽  
Current Density ◽  
Solvothermal Method ◽  
Lithium Ion ◽  
Constant Current ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Structure Morphology ◽  
Specific Discharge

nanoMn3O4was prepared by a simple solvothermal method. The structure, morphology and electrochemical properties of the products were investigated by XRD, SEM and constant current discharge-charge test. The results of XRD and SEM shows that nanoMn3O4is high-purity, and it’s diameter is about 30 nm. It could deliver an initial discharge capacity of 1324.4 mAh g-1at the current density of 25.5 mA g-1, and the specific discharge capacity is 586.9 mAh g-1after 30 cycles at the current density of 30.4 mA g-1.

Optimization of Synthesis Condition for LiFePO4/C Cathode Material

2011 ◽  
Vol 236-238 ◽  
pp. 698-702
Author(s):  
Ling Zhi Zhu ◽  
En Shan Han ◽  
Ji Lin Cao
Keyword(s):  
Citric Acid ◽  
Room Temperature ◽  
Specific Capacity ◽  
Carbon Coatings ◽  
Treatment Processes ◽  
Initial Discharge ◽  
Structure Morphology ◽  
Tap Density ◽  
Pre Treatment ◽  
Acid Coating

This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. Common and cheap organic matters (Glucose anhydrous, Citric acid, Vitamin C, Sucrose) were selected for carbon coatings on LiFePO4. The four pre-treatment processes were employed to optimize the carbon coating process, and through solid state-carbothermal reduction synthesis of LiFePO4/C composites. The structure, morphology and electrochemical performance of the material were studied by XRD, SEM and galvanostatic charge-discharge methods. It is observed that the tap density of citric acid coating material can reach 1.44 g/ml. Conductivity increased four orders of magnitude. At room temperature, the initial discharge specific capacity of the materials is as high as 89.6 mAh/g at 5.0 C (corresponding to 850 mA/g). After 30 cycles, the capacity is 83.9 mAh/g and decay only 2.0 %.

scholarly journals Effect of lithium borate coating on the electrochemical properties of LiCoO2 electrode for lithium-ion batteries

2020 ◽  
Vol 8 (1) ◽  
pp. 20218101
Author(s):  
Victor D. Zhuravlev ◽  
Ksenia V. Nefedova ◽  
Elizaveta Yu. Evschik ◽  
Elena A. Sherstobitova ◽  
Valery G. Kolmakov ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Electrochemical Characteristics ◽  
Lithium Borate ◽  
Initial Discharge Capacity ◽  
Organic Fuel ◽  
Half Cell ◽  
Electrochemical Testing ◽  
Initial Discharge ◽  
Lithium Cobaltite ◽  
Coulomb Efficiency

The effect of a protective coating of fused lithium borate, Li3BO3, on the physicochemical and electrochemical characteristics of LiCoO2 has been studied. A cathode material produced by the SCS method using binary organic fuel, glycine and citric acid. The influence of the experiment conditions on the morphology, crystal structure and specific surface of lithium cobaltite was studied. Electrochemical testing of LiCoO2∙nLi3BO3 samples, n = 5 and 7 mass %, has been performed in the cathode Li|Li+-electrolyte|LiCoO2∙nLi3BO3 half-cell using 1M LiPF6 in EC/DMC mixture (1:1) as electrolyte in the 2.7-4.3 V range at normalized discharge current С/10, С/5, С/2. The maximal initial discharge capacity of 185 mAh/g was detected for the samples with 5 mass % Li3BO3. The coulomb efficiency of optimal materials in the 40th cycle was 99.1%.

scholarly journals High performance of solvothermally prepared VO2(B) as anode for aqueous rechargeable lithium batteries

2015 ◽  
Vol 80 (5) ◽  
pp. 685-694 ◽  
Author(s):  
Sanja Milosevic ◽  
Ivana Stojkovic ◽  
Miodrag Mitric ◽  
Nikola Cvjeticanin
Keyword(s):  
Discharge Capacity ◽  
High Performance ◽  
Electronic Conductivity ◽  
Charge Transfer Resistance ◽  
Initial Discharge Capacity ◽  
Rechargeable Lithium Batteries ◽  
Transfer Resistance ◽  
Initial Discharge ◽  
The Stability ◽  
Low Charge

The VO2 (B) was synthesized via a simple solvothermal route at 160oC in ethanol. The initial discharge capacity of VO2 (B) anode, in saturated aqueous solution of LiNO3, was 177 mAh g-1 at a current rate of 50 mA g-1. After 50 cycles capacity fade was 4%, but from 20th-50th cycle no capacity drop was observed. The VO2 (B) has shown very good cyclability at current rate of even 1000 mA g-1 with initial discharge capacity of 92 mAh g-1. The excellent electrochemical performance of VO2 (B) was attributed to the stability of micro-nano structures to repeated intercalation /deintercalation process, very good electronic conductivity as well as the very low charge transfer resistance in the aqueous electrolyte.

The Structure and Electrochemical Performance of LiNi0.3Co0.3Mn0.3Cr0.1O2 Cathode Materials

2014 ◽  
Vol 1024 ◽  
pp. 339-343
Author(s):  
Rusdi Roshidah ◽  
Norlida Kamarulzaman ◽  
Jaafar Mohd Hilmi ◽  
Abd Rahman Azilah ◽  
Mohamed Nor Sabirin ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Single Phase ◽  
Specific Capacity ◽  
Combustion Method ◽  
Electrochemical Characteristics ◽  
Performance Style ◽  
Layered Cathode Materials ◽  
Li Ion ◽  
The Stability ◽  
Battery Application

Normal 0 false false false MicrosoftInternetExplorer4 Layered cathode materials are important for Li-ion battery application due to their high theoretical specific capacity. Efforts have been made to synthesize mixed-metal cathode materials such as LiNi1/3Co1/3Mn1/3O2 based materials with promising electrochemical characteristics. This is to lower the expensive Co content and help to stabilize the materials. Substitution of these materials with chromium producing LiNi0.3Co0.3Mn0.3Cr0.1O2 material will also improve the stability of the cathodes. In this work, pure and single phase LiNi0.3Co0.3Mn0.3Cr0.1O2 material was successfully synthesized using a combustion method. The samples were then annealed at 900 °C for 24, 48 and 72 h. From the charge-discharged measurements, it was found that the performance of the LiNi0.3Co0.3Mn0.3Cr0.1O2 cathode material annealed at 900 °C for 24 h shows the best performance. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}

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.

Al-Doped Fe2O3 nanoparticles: advanced anode materials for high capacity lithium ion batteries

2021 ◽  
Vol 50 (15) ◽  
pp. 5115-5119
Author(s):  
Yongqing Yuan ◽  
Shijie Liang ◽  
Weipei Liu ◽  
Qiong Zhao ◽  
Puguang Peng ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Electrochemical Behavior ◽  
Anode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
Fe2o3 Nanoparticles ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
The Stability

We successfully synthesized Al-Fe2O3 anode with high initial discharge capacity of 1210 mAh g−1 under 0.5 A g−1 and maintained around 900 mAh g−1 during the cycles. The doping of Al assists in the stability and electrochemical behavior of the whole electrode.

Effect of Improved ThO2 Particle Dispersion in Nickel on High-Temperature Strength

1970 ◽  
Vol 28 ◽  
pp. 444-445
Author(s):  
E. R. Kimmel ◽  
H. L. Anthony ◽  
W. Scheithauer
Keyword(s):  
High Temperature ◽  
Metal Matrix ◽  
Oxide Particle ◽  
Oxide Phase ◽  
Dislocation Motion ◽  
Particle Dispersion ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Oxide Particles ◽  
The Stability

The strengthening effect at high temperature produced by a dispersed oxide phase in a metal matrix is seemingly dependent on at least two major contributors: oxide particle size and spatial distribution, and stability of the worked microstructure. These two are strongly interrelated. The stability of the microstructure is produced by polygonization of the worked structure forming low angle cell boundaries which become anchored by the dispersed oxide particles. The effect of the particles on strength is therefore twofold, in that they stabilize the worked microstructure and also hinder dislocation motion during loading.

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