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Improvement of the electrochemical properties of Li/CFx primary batteries induced by Nitrogen plasma treatment from silica and carbon fluoride

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(5), pp.1521-1528
  • DOI : 10.1007/s42823-024-00719-z
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : January 12, 2024
  • Accepted : March 9, 2024
  • Published : June 14, 2024

Ha Seongmin 1 Lim Chaehun 2 Myeong Seongjae 3 Lee In Woo 2 Lee, Young-Seak 2

1충남대학교 응용화학공학과
2충남대학교
3Chungnam National University

Accredited

ABSTRACT

The electrochemical properties of a CFX cathode were improved by defluorination of the surface with a N2 plasma and using a silica wafer. Compared to the N2 plasma treatment alone, when the CFX and silica were reacted together, the C-F bonds were modified and the surface was etched efficiently, so defluorination was enhanced. An electrochemical analysis confirmed that Half-cells prepared by treating CFx and silica with nitrogen plasma exhibited a capacity of about 400 mAh/g at 5C. In addition, it was confirmed that the loss of charge transfer was reduced by up to 71% compared to that for pristine CFX. As shown by a GITT analysis, when the CFx and silica were treated with N2 plasma together, the ion conductivity gradually increased due to a decrease in the ion diffusion barriers and the formation of a carbon layer. Therefore, this is a simple and effective way to improve the conductivities of CFX cathode materials with the energy of a N2 plasma and the silica-fluorine reaction.

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