Investigation of design parameter effects on high current performance of lithium-ion cells with LiFePO 4/graphite electrodes

Seungho Yu, Youngmin Chung, Min Seob Song, Jin Hyun Nam, Won Il Cho

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Electrode design is an essential task for successful development of lithium-ion batteries. Provided that the same materials are given, proper dimensioning of the electrodes and balanced composition of the materials in them can maximize the cell performance, such as the discharge capacity. However, many electrode design parameters have conflicting effects on the performance, and thus careful optimization of these parameters is required. This study experimentally investigated the effects of several electrode design parameters on the performance of lithium ion cells with a LiFePO 4 cathode and a natural graphite anode, focusing on their high current operations. The conflicting effects of the conductor ratio (the weight fraction of electronic particle additives), electrode thickness, and electrode density (porosity) on the cell capacity were studied. In addition, a detailed one-dimensional electrochemical model was also used to simulate the observed performance characteristics and to identify their underlying mechanisms limiting the performance. Based on the experimental and numerical results, the optimal ranges for the electrode design parameters were discussed to achieve better performance of the LiFePO 4/graphite batteries.

Original languageEnglish
Pages (from-to)443-453
Number of pages11
JournalJournal of Applied Electrochemistry
Volume42
Issue number6
DOIs
Publication statusPublished - 2012 Jun
Externally publishedYes

Keywords

  • Active material density
  • Battery design parameter
  • Electrochemical modeling
  • Electrode thickness
  • LiFePO
  • Lithium-ion battery

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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