Cupid, D.M.

Franke, P.

Lepple, M.

Seifert, H.J.

Ziebert, C.

Cupid, D. M.

Seifert, H. J.

KITopen

KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association Autor: Arial 50 pt, schwarz oder grau („Schattenfarbe“) Thermodynamics of Copper Oxide Conversion Type Electrodes for Lithium-ion Batteries  Introduction and Motivation  Electrodes based on materials in the Cu-F -O system are promising for next-generation lithium ion batteries as they exhibit a very high theoretical specific capacity and charge density. Thermodynamic and electrochemical investigations of the Li-Cu-O sub-system of the Li-Cu-Fe-O system combined with a CALPHAD-based assessment are important since the open circuit voltage of an electrochemical cell is determined by the standard Gibbs free energy of the cell reaction.  To investigate the Li-Cu-O sub-system, the ternary compounds Li2CuO2 and LiCu2O2 were prepared using the solid state reaction method. Phase transformations were studied using thermal analysis and the heat capacities were measured using differential scanning calorimetry. In addition, a thermodynamic description of the system at 25 °C was developed based on literature data.   CuO was used as active material for the electrode and coin cells were assembled. First galvanostatic cycling tests at different charging rates were conducted. M. Lepple, D.M. Cupid, P. Franke, C. Ziebert, H.J. Seifert DFG Priority Programme SPP 1473, WeNDeLIB  Thermodynamics and kinetics for stabilization of conversion-type electrodes for LIB based on nano 3d transition metal oxide composites  Ar-Plasma Electrochemical investigations Summary  Li2CuO2 and LiCu2O2 were synthesized in oxygen and argon atmosphere, respectively, at 700°C using the solid state method.  The stability of LiCu2O2 was investigated using simultaneous DTA/TG. LiCu2O2 is stable in argon up to 705°C. However, in air LiCu2O2 reacts with oxygen in the atmosphere on heating.  Cp data for the compounds Li2CuO2 and LiCu2O2 were measured.  A dataset of the Li-Cu-O system valid at 298.15 K based on literature data has been developed.  Theoretical electrochemical titration curves were calculated using the database.  Copper-oxides were used as active materials for conversion type electrodes and coin cells were assembled.  Galvanostatic tests with different C-Rates were performed.    Acknowledgements This work is supported by the priority programme SPP 1473 WeNDeLIB of the German Science Foundation (DFG) in the project SE 647/14-1. Experimental Investigations CALPHAD (Computer coupling of thermochemistry and phase diagram) Thermodynamic description of the Li-Cu-O system at 298.15 K based on literature data for the binary systems [1, 2, 3] and the stoichiometric ternary compounds [4].  [1] [2] [3] [4] 298.15 K Calculated titration curves: DSC [1] K. Chang, B. Hallstedt, CALPHAD, 2011, 35:160-164 [2] B . Hallstedt,L.J. Gauckler CALPHAD, 2003, 27:177-191 [3] N. Saunders in: I. Ansara, A.T. Dinsdale, M.H. Rand [3]  [3] (eds.): Cost 507, Vol. 2, Luxembourg,1998,168–169 [4] N.A. Godshall, Solid State Ionics 1986, 18&19:788-793 FzE LithiumcathodeLithium⋅−−=0µµa) Phase stability of LiCu2O2 DTA/TG In argon In air b) Specific heat capacity Electrochemical Investigations Galvanostatic cycling at 25°C The results of these investigations will be used as input experimental data for the thermodynamic optimization of the multi-component system using the CALPHAD-method. C. Daniel, JOM, 2008, 60 (9):43-48 CuOCuOLiOOLiCuTG 3212: 22222 +→+∆Thermodynamics 

Thermodynamics of copper oxide conversion type electrodes for lithium-ion batteries

https://publikationen.bibliothek.kit.edu/220089083/3816204

Thermodynamics of copper oxide conversion type electrodes for lithium-ion batteries

Abstract

Similar works

Full text

Available Versions

KITopen