Journal
JOURNAL OF POWER SOURCES
Volume 319, Issue -, Pages 147-158Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.04.052
Keywords
Lithium ion cell; Electrode thickness and porosity; Specific energy and power; Ragone plot; Simulation
Funding
- International Collaborative Energy Technology R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20158510050020]
- Ministry of Education (MOE)
- National Research Foundation (NRF) of Korea through Human Resource Training Project for Regional Innovation [2014066977]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20158510050020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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LiNi0.6Co0.2Mn0.2O2 cathodes of different thicknesses and porosities are prepared and tested, in order to optimize the design of lithium-ion cells. A mathematical model for simulating multiple types of particles with different contact resistances in a single electrode is adopted to study the effects of the different cathode thicknesses and porosities on lithium-ion transport using the nonlinear least squares technique. The model is used to optimize the design of LiNi0.6Co0.2Mn0.2O2/graphite lithium-ion cells by employing it to generate a number of Ragone plots. The cells are optimized for cathode porosity and thickness, while the anode porosity, anode-to-cathode capacity ratio, thickness and porosity of separator, and electrolyte salt concentration are held constant. Optimization is performed for discharge times ranging from 10 h to 5 min. Using the Levenberg-Marquardt method as a fitting technique, accounting for multiple particles with different contact resistances, and employing a rate-dependent solid-phase diffusion coefficient results in there being good agreement between the simulated and experimentally determined discharge curves. The optimized parameters obtained from this study should serve as a guide for the battery industry as well as for researchers for determining the optimal cell design for different applications. (C) 2016 Elsevier B.V. All rights reserved.
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