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Design Principles to Govern Electrode Fabrication for the Lithium Trivanadate Cathode
- Source :
- Journal of The Electrochemical Society. 167:100503
- Publication Year :
- 2020
- Publisher :
- The Electrochemical Society, 2020.
-
Abstract
- A full depth of discharge mathematical model for the lithium trivanadate cathode, considering lithiation of the layered α-phase, phase change, and lithiation of the rock-salt like β-phase at lower potentials, is developed. The coupled electrode-scale and crystal-scale model is fit to electrochemical data, and additionally validated with operando EDXRD. There is good agreement between the simulated and measured spatial variation of the volume fraction of the β-phase. This mathematical model is used to guide electrode fabrication, accounting for both ionic and electronic transport effects. Values of three design parameters—electrode thickness, porosity, and volume fraction of conductor—are identified, and the sensitivity of the energy density to these design parameters is quantified. The model is also used to investigate electrode design to create electrodes that deliver the maximum achievable energy density under the constraint that the α to β-phase transition is avoided, since phase change has been demonstrated to reduce cycle life. The energy density sacrificed to avoid phase change decreases at higher discharge rates, but the target values for electrode fabrication remain the same as those when optimizing the electrode for the full depth of discharge.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
020209 energy
chemistry.chemical_element
02 engineering and technology
Condensed Matter Physics
Electrochemistry
Depth of discharge
Cathode
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Conductor
law.invention
chemistry
law
Electrode
Volume fraction
0202 electrical engineering, electronic engineering, information engineering
Materials Chemistry
Lithium
Composite material
Porosity
Subjects
Details
- ISSN :
- 19457111 and 00134651
- Volume :
- 167
- Database :
- OpenAIRE
- Journal :
- Journal of The Electrochemical Society
- Accession number :
- edsair.doi...........f9997a95d9e352af6221ef3cd84d64a7
- Full Text :
- https://doi.org/10.1149/1945-7111/ab91c8