Thermodynamic investigations of copper oxides used as conversion type electrodes in lithium ion batteries

Lepple, Maren; Adam, Robert; Cupid, Damian M.; Franke, P.; Bergfeldt, Thomas; Wadewitz, Daniel; Rafaja, David; Seifert, Hans Jürgen

doi:10.1007/s10853-013-7374-x

Cited by 13 publications

(16 citation statements)

References 38 publications

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“…The heat capacity of Cu 2 O could be measured using the DSC 404 C, with which temperatures up to 1373 K could be attained with platinum crucibles. The partial pressure of oxygen measured in this device is p(O 2 ) = 2.0910 À5 , at which Cu 2 O is stable between 940 and 1420 K. [33] In a previous study, the transition temperature of LiCu 2 O 2 in argon atmosphere is 986 K. [19] Therefore, the DSC 404 F1 was used to measure the heat capacity of LiCu 2 O 2 .…”

Section: Heat Capacity Measurementsmentioning

confidence: 99%

“…[39] At low oxygen partial pressures, LiCu 2 O 2 is also an equilibrium phase at room temperature. [19,40] However, a detailed study of the influence of oxygen partial pressure on the phase stability of LiCu 2 O 2 has not yet been reported. The heat capacity of LiCu 2 O 2 was only measured at very low temperatures by Zvyagin et al up to 50 K [20] and later by Rusydi et al up to 28 K [21] to investigate the magnetic behavior.…”

Section: Literature Reviewmentioning

confidence: 99%

“…CuO (Alfa Aesar, Puratronic, 99.995% metals basis), Cu 2 O (Aldrich, 99.99% trace metals basis, anhydrous) and Li 2 CO 3 (Cerac, 99.999%) were mixed in a 2:1:1 ratio in a mortar, pressed into a pellet with a diameter of 13 mm and a mass of approximately 1 g. The pellet was then heat treated for 30 h at 973 K under flowing argon, as described in Ref 19. The phase and chemical compositions of the ternary sample were characterized using XRD and ICP-OES, respectively (details see [19] ). After synthesis, the sample was stored in an argon filled glovebox to prevent reactions with water vapor and CO 2 .…”

Section: Sample Preparationmentioning

confidence: 99%

“…In a previous work, [19] the thermal stability of LiCu 2 O 2 was investigated and a thermodynamic description for the Li-Cu-O system valid at 298 K was developed using data on the Gibbs free energy of reaction of the ternary oxides from the binary oxides. So far, the heat capacity of LiCu 2 O 2 has been measured only at very low temperatures to investigate its magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

“…So far, the heat capacity of LiCu 2 O 2 has been measured only at very low temperatures to investigate its magnetic properties. [20,21] For that reason, the heat capacities of the ternary compounds at temperatures above 298 K in the thermodynamic description [19] were estimated according to Eq. 2.…”

Section: Introductionmentioning

confidence: 99%

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Heat Capacities of LiCu2O2 and CuO in the Temperature Range 323-773 K and Cu2O in the Temperature Range 973-1273 K

Lepple

Cupid

Franke

et al. 2014

J. Phase Equilib. Diffus.

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The Li-Cu-O system is a promising materials system for the development of new anode materials for lithium ion batteries based on copper oxides. The specific heat capacities of binary and ternary oxides in this system are required to generate thermodynamic descriptions using the CALPHAD method. Additionally, heat capacity data can be used to support development of thermal management systems for the lithium ion batteries based on these materials. In this study, differential scanning calorimetry was used to measure the heat capacities of the binary copper oxides and of the ternary LiCu 2 O 2 . The heat capacity of CuO was measured from 323 to 773 K and that of Cu 2 O was measured from 973 to 1273 K. The heat capacity of CuO is in good agreement with literature data. However, the heat capacity of Cu 2 O is slightly lower than that calculated using CALPHAD-based thermodynamic descriptions of the Cu-O system but higher than that determined using ab initio calculations. Although the synthesis of single phase LiCu 2 O 2 is difficult because of the mixed oxidation states of Cu, our heat capacity measurements show that the constituent additivity method can be used to estimate the heat capacity of LiCu 2 O 2 .

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Section: Heat Capacity Measurementsmentioning

confidence: 99%