Improved electrochemical behavior of W-coated SiO–graphite composite anode in lithium-ion secondary battery

Jee Ho Yom, Jun Kyu Lee, Wooyoung Yoon

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The electrochemical performance of a W-coated SiO–graphite composite anode was evaluated in Li-ion secondary coin cells. Tungsten was coated onto the SiO–graphite composite electrode by physical vapor deposition. The layered structure of the W-coated electrode was imaged using transmission electron microscopy and the uniformity of the coating was confirmed by electron probe microanalysis. In coin cells, the W-coated electrode showed a higher retention capacity and discharge capacity than the uncoated electrode at a C rate of 0.5 C after 100 cycles. The discharge capacity of the coated cell was 566 mAh g<sup>−1</sup> after the 1st cycle and 358 mAh g<sup>−1</sup> after the 100th cycle at a C rate of 0.5 C, whereas that of the uncoated cell was 517 mAh g<sup>−1</sup> after the 1st cycle and 269 mAh g<sup>−1</sup> after the 100th cycle. The retention capacity of the coated cell was 63.2 % after 100 cycles, whereas that of the uncoated cell was 52.0 %. A comparison of the W-coated and uncoated electrodes after 100 cycles revealed that the W layer, which has superior conductivity and mechanical properties, improved the electrochemical performance of the electrode. Impedance analysis also confirmed that the W coating enhanced the cell performance.

Original languageEnglish
Pages (from-to)397-403
Number of pages7
JournalJournal of Applied Electrochemistry
Volume45
Issue number5
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • Graphite
  • Lithium-ion secondary battery
  • Physical vapor deposition
  • Silicon monoxide
  • Tungsten

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Improved electrochemical behavior of W-coated SiO–graphite composite anode in lithium-ion secondary battery'. Together they form a unique fingerprint.

Cite this