Effect of Cr and Mo doping on the electrochemical properties of freeze-dried LiCoO2

Date

2014-10-01

Author

Buyukburc, Atil
Aydınol, Mehmet Kadri

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

161
views

0
downloads

In this study, LiCoO2 is doped with 2 mol.% Cr and Mo in order to determine the effect of these elements on the electrochemical performance. Precursors are synthesized by means of freeze drying. Calcination is applied at 750 degrees C for 24 h. Doping content and calcination temperature as well as duration are very important for producing impurity-free layered LiCoO2. If the doping content is larger than 2 mol.% or when the calcination temperature is decreased to 550 degrees C, impurity phases are seen. As a result, the sample doped with 2 mol.% Cr has better high charge and discharge rate capability, and cycleability, but discharge capacity is slightly lowered when compared to the undoped sample. Electrochemical impedance spectroscopy results show that surface film resistances of Cr-doped samples are lower than that of the undoped sample.

Subject Keywords

Li-ion battery, LiCoO2, Doping, Freeze drying

URI

https://hdl.handle.net/11511/47587

Journal

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH

DOI

https://doi.org/10.3139/146.111104

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Effect of pH on erythropoietin production by recombinant Pichia pastoris in fed-batch operation Soyaslan, Elif Şükran; Çalık, Pınar; Department of Chemical Engineering (2010) In this study, the effects of pH on therapeutically important protein, recombinant human erythropoietin (rhuEPO), production by Pichia pastoris was investigated at pH=4.0, 4.5, 5.0, 5.5 and 6.0. rHuEPO production was started by methanol induction in fed-batch mode. The highest cell concentration was obtained at pH=4.5 as 81.4 g L-1. The co-substrate substrate sorbitol, which was added batch-wise, was consumed at t=15 h of the operations at pH=4.0, 4.5 and 5.0. However as the pH increases above pH=5.0 the so...
Effect of H2O TEOT ratio on photocatalytic activity of sol gel derived TiO2 powder Lütfi, Ağartan; Kapusuz, Derya; Park, Jongee; Öztürk, Abdullah (2013-01-01)
Effect of lithium doping on the properties of Tl-based superconductors Kayed, TS; Ozkan, H; Hasanlı, Nızamı (IOP Publishing, 2001-09-01) The effects of lithium doping on the formation and properties of the T1-based superconductors have been studied. Lithium atoms up to around 3 mol.% have been added to the oxides of nominal composition Tl1.8Ba2Ca2.2Cu3Ox, and the usual solid-state reaction method has been applied. Lithium additions in the range 0.23-0.29 mol.% increase the fraction of the Tl-2223 phase and significantly improve the critical temperature of the samples. Higher amounts of lithium additions diminish the Tl-2223 phase, reduce the...
Effect of H2O and SO2 on the activity of Pd/TiO2 catalysts in catalytic reduction of NO with methane in the presence of oxygen MITOME, Junko; Karakaş, Gürkan; Bryan, Kimberly A.; Ozkan, Umit S. (1998-06-18) Effect of H2O and SO2 on the NO reduction activity of the Pd/titania catalysts was examined in the NO+CH4+O-2 reaction. Steady-state and transient response experiments were performed using a tubular flow reactor. Isotopically labeled methane, (CH4)-C-13, was used in studying the transient behavior of the catalytic system. Reactor effluents were analyzed by using gas chromatography, mass spectrometry, and chemiluminescense techniques. Steady-state reaction experiments showed that the catalyst has a high acti...
Effect of cleaning process on combustion characteristics of lignite Ozbas, Kazim Esber; Hicyilmaz, Cahit; Kök, Mustafa Verşan; Bilgen, Sedat (2000-01-01) In this research, the results of a study on the combustion characteristics of Soma lignite before and after cleaning are presented. Non-isothermal thermogravimetry (TG/DTG) experiments were carried out for four different size fractions. Experiments were performed from ambient to 900 degrees C in air atmosphere at 10 degrees C/min heating rate. TG/DTG curves revealed three reaction regions. The first region is due to the evaporation of moisture in the coal. The second region can be called the primary reactio...

Citation Formats

A. Buyukburc and M. K. Aydınol, “Effect of Cr and Mo doping on the electrochemical properties of freeze-dried LiCoO2,” INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, pp. 983–991, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47587.