Effect of LiFePO4 cathode density and thickness on electrochemical performance of lithium metal polymer batteries prepared by in situ thermal polymerization

Jiseon Jeong, Hyewon Lee, Jaecheol Choi, Myung Hyun Ryou, Yong Min Lee

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

In order to investigate the effects of electrode density and thickness on the room temperature electrochemical performance of lithium metal polymer batteries (LMPBs), four LiFePO4 cathodes with different electrode density/thickness (1.6 g cm-3/20 μm, 1.6 g cm-3/40 μm, 2.0 g cm-3/20 μm, and 2.0 g cm-3/40 μm) are prepared. Several types of unit cells employing each cathode are prepared using in situ thermally cross-linked polymer electrolytes controlled under the same manufacturing condition. The unit cells employing the thinnest cathode with highest density achieve the most improved rate capability and cycle life, which seems to be attributed to the higher electrical conductivity of the cathode and shorter diffusion length of Li+ ions within the cathode pores. In addition, the LMPB with an optimized LiFePO4 cathode (2.0 g cm-3, 20 μm) and polymer electrolyte (5 vol% of the crosslinking agent with nonvolatile liquid electrolytes) delivers a high and stable charge/discharge capacity under very fast charging and discharging conditions (at a 2 C rate) at room temperature.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalElectrochimica Acta
Volume154
DOIs
Publication statusPublished - 1 Feb 2015
Externally publishedYes

Keywords

  • Electrode density and thickness
  • Lithium metal polymer batteries
  • Polymer electrolytes

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