Effect of additives on electrochemical performance of lithium nickel cobalt manganese oxide at high temperature

Kyoung Seok Kang, Suneui Choi, Junho Song, Sang Gil Woo, Yong Nam Jo, Jungkyu Choi, Taeeun Yim, Ji Sang Yu, Young Jun Kim

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Lithium-nickel-cobalt-manganese oxide, Li[NixCo yMnz]O2 (NCM) is a low-cost cathode material with a high capacity and a moderately high rate capability, however, it still suffers from poor electrochemical performance. In this study, several types of additives are attempted to enhance the surface stability of high-Ni-content (Ni ≥ 60%) cathodes and the most effective additive turns out to be PS. The cycle performance in the presence of 2% PS is much improved at a high temperature of 60 C: (1) 98.9% of its initial capacity is preserved, (2) the increase in thickness is only 17.9%, preventing undesired swellings, and (3) gases are not generated in large amounts with the internal pressure being 56.4 kPa. The FT-IR spectroscopy results suggest that the surface of the cathode in the presence of 2% PS is covered with a film of alkyl sulfone components (RSOSR and RSO 2SR), which is possibly formed by the electrochemical oxidation of PS. The current results confirm that the electrochemical performance of Ni-rich cathodes can be improved via the appropriate use of additives. They also indicate that among the tested additive candidates in this study, PS is highly desirable for enhancing the electrochemical performance of Ni-rich cathodes.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalJournal of Power Sources
Volume253
DOIs
Publication statusPublished - 2014 May 1

Keywords

  • 1,3-Propane sulfone
  • Additive
  • Cathode
  • Lithium nickel cobalt manganese oxide
  • Sulfone

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Effect of additives on electrochemical performance of lithium nickel cobalt manganese oxide at high temperature'. Together they form a unique fingerprint.

  • Cite this