C4F8 plasma treatment as an effective route for improving rate performance of natural/synthetic graphite anodes in lithium ion batteries

Choonghyeon Lee, Yu Jin Han, Young Deok Seo, Koji Nakabayashi, Jin Miyawaki, Ricardo Santamaría, Rosa Menéndez, Seong Ho Yoon, Jyongsik Jang

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Carbon-fluorine (CmFn) groups were selectively introduced on the surface of natural and synthetic graphites through plasma-fluorination using C4F8 vacuum plasma treatment. The type of carbon-fluorine bondings on the plasma-fluorinated graphite surface were selectively controlled by adjusting plasma processing time from 10 to 20 min. Systematic surface analyses revealed that the fluorine amount on the surface of plasma-fluorinated graphite was determined by the type of intrinsic structure and degree of graphitization of graphite. The electronegative semi-ionic carbon-fluorine groups on the graphite surface reduced the resistance related to lithium ion migration and charge transfer, leading to highest discharge capacity of 387 mA h/g at 1st cycle and discharge capacity of 293 mA h/g at high 10 C rate without deteriorating the 1st cycle Coulombic efficiency. This novel vacuum plasma treatment of introducing highly electronegative CmFn species on graphite can illuminate a new route of preparing superior lithium ion battery anode.

Original languageEnglish
Pages (from-to)28-35
Number of pages8
JournalCarbon
Volume103
DOIs
Publication statusPublished - Jul 1 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Fingerprint Dive into the research topics of 'C<sub>4</sub>F<sub>8</sub> plasma treatment as an effective route for improving rate performance of natural/synthetic graphite anodes in lithium ion batteries'. Together they form a unique fingerprint.

Cite this