Effects of capacity ratios between anode and cathode on electrochemical properties for lithium polymer batteries

Cheon Soo Kim, Kyung Min Jeong, Keon Kim, Cheol Woo Yi

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The areal capacity ratio of negative to positive electrodes (N/P ratio) is the most important factor to design the lithium ion batteries with high performance in the consideration of balanced electrochemical reactions. In this study, the effect of N/P ratio (1.10, 1.20, and 1.30) on electrochemical properties has been investigated with a lithium polymer battery with PVdF-coated separator and 1.40 Ah of capacity. The N/P ratio is controlled by adjusting the anode thickness with a fixed anode density. The cell with an N/P ratio higher than 1.10 effectively suppresses the lithium plating at the 0.85C-rate charging at 25 °C and the cell with 1.20 of N/P ratio shows the enhanced cycle performance in comparison with other cells. Among the cells with differently designed N/P ratios, significant difference was not observed in the aging test with fully charged batteries at 25 and 45°C. The effect of N/P ratio on electrochemical properties of lithium batteries can help to design the safe full cell without lithium plating.

Original languageEnglish
Pages (from-to)431-436
Number of pages6
JournalElectrochimica Acta
Volume155
DOIs
Publication statusPublished - 2015 Feb 10

Keywords

  • Lithium Plating
  • Lithium polymer battery
  • N/P ratio
  • PVdF-coated separator

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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