Improved electrochemical performances of lithium-oxygen batteries with tungsten carbide-coated cathode

Bon Seok Koo, Jun Kyu Lee, Wooyoung Yoon

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The electrochemical properties of lithium-oxygen batteries are improved by coating a tungsten carbide layer onto an oxygen cathode. Tungsten carbide (WC) coating is conducted by physical vapor deposition. The uniform deposition of WC onto the cathode is confirmed by scanning electron microscopy, field-emission transmission electron microscopy and electron probe microanalysis. The discharge-recharge voltage gap of the cell with a WC-coated electrode is estimated to be 0.88 V, which is 700 mV smaller than that of an electrode without the WC coating at 100 mA g-1 carbon. The overpotentials of the WC-coated electrode remain unchanged even after the 10th cycles, while that of the uncoated electrode gradually increases. In addition, the WC-coated electrode exhibits a stable voltage profile, even at a current density of 200 mA g-1 carbon. The observed improvement in cell performance can be attributed to the catalytic property and high electrical conductivity of WC. The enhanced electrochemical properties of cells are examined by impedance analysis and SEM.

Original languageEnglish
Article number047101
JournalJapanese Journal of Applied Physics
Volume54
Issue number4
DOIs
Publication statusPublished - 2015 Apr 1

Fingerprint

tungsten carbides
Tungsten carbide
electric batteries
Lithium
Cathodes
lithium
cathodes
Electrodes
Oxygen
electrodes
oxygen
Electrochemical properties
coatings
Coatings
cells
Scanning electron microscopy
scanning electron microscopy
Carbon
carbon
Physical vapor deposition

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Improved electrochemical performances of lithium-oxygen batteries with tungsten carbide-coated cathode. / Koo, Bon Seok; Lee, Jun Kyu; Yoon, Wooyoung.

In: Japanese Journal of Applied Physics, Vol. 54, No. 4, 047101, 01.04.2015.

Research output: Contribution to journalArticle

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