Electrochemical behavior of carbon-coated silicon monoxide electrode with chromium coating in rechargeable lithium cell

Sun Woo Hwang, Jun Kyu Lee, Woo Young Yoon

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The effects of Cr coating are studied with respect to improving the electrochemical characteristics of carbon-coated silicon monoxide anodes in rechargeable Li cells. The Cr coating is applied by ion beam sputtering. Analyses of the coating are carried out by EDX, SEM, TEM, and EPMA. A coin cell (CR2032) with a carbon-coated SiOx anode coated with Cr and a lithium cobalt oxide (LCO) cathode is assembled in an argon-filled glove box. The charged capacity of the Cr-coated SiOxC/LCO cell is 1127 mAh g -1 in the 1st cycle at 0.1 C, while that of the uncoated SiO x-C/LCO cell is 956 mAh g-1. In addition, the Cr-coated SiOxeC/LCO cell has a discharged capacity of 733 mAh g-1, which is higher than that of the uncoated cell (635 mAh g-1). Furthermore, the discharge capacity retention ratio (100th:2nd) of the Cr-coated cell is 75% while that of the uncoated cell is 69%. The rate capability of the Cr-coated cell is superior to that of the uncoated cell. Cr has good electrical conductivity, enabling more Li ions to be stored in the Cr-coated cell than in the uncoated cell. Investigations into the improved electrochemical characteristics are carried out through the analyses of impedance, voltage profile, and cycle data.

Original languageEnglish
Pages (from-to)620-624
Number of pages5
JournalJournal of Power Sources
Volume244
DOIs
Publication statusPublished - 2013

Keywords

  • Chromium
  • Ion sputtering
  • Lithium ion battery
  • Silicon monoxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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