Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Model Prediction and Experiments for the Electrode Design Optimization of LiFePO4/Graphite Electrodes in High Capacity Lithium-ion Batteries

  • Yu, Seungho (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Kim, Soo (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Kim, Tae Young (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Nam, Jin Hyun (School of Mechanical and Automotive Engineering, Daegu University) ;
  • Cho, Won Il (Center for Energy Convergence, Korea Institute of Science and Technology)
  • Received : 2012.08.27
  • Accepted : 2012.10.05
  • Published : 2013.01.20
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Abstract

$LiFePO_4$ is a promising active material (AM) suitable for use in high performance lithium-ion batteries used in automotive applications that require high current capabilities and a high degree of safety and reliability. In this study, an optimization of the electrode design parameters was performed to produce high capacity lithium-ion batteries based on $LiFePO_4$/graphite electrodes. The electrode thickness and porosity (AM density) are the two most important design parameters influencing the cell capacity. We quantified the effects of cathode thickness and porosity ($LiFePO_4$ electrode) on cell performance using a detailed one-dimensional electrochemical model. In addition, the effects of those parameters were experimentally studied through various coin cell tests. Based on the numerical and experimental results, the optimal ranges for the electrode thickness and porosity were determined to maximize the cell capacity of the $LiFePO_4$/graphite lithium-ion batteries.

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