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Effects of phosphorus content and operating temperature on the electrochemical performance of phosphorus-doped soft carbons

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2014, 15(4), pp.277-281
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

김은희 1 Jung Yongju ORD ID 1

1한국기술교육대학교

Accredited

ABSTRACT

A series of high capacity soft carbons with different phosphorus contents were successfullyprepared by carbonizing petroleum cokes treated with hypophosphorous acid at 900°C. Theeffect of phosphorus content on the electrochemical performance of the soft carbons wasextensively investigated. The P-doped soft carbons exhibited greatly enhanced dischargecapacities and outstanding rate capabilities with increasing phosphorus content. In addition,the influence of temperature on the electrochemical behaviors of the soft carbons wasinvestigated in a wide temperature range of 25°C to 50°C. Surprisingly, the electrochemicalproperties of the pristine and P-doped soft carbons were highly sensitive to the operatingtemperature, unlike conventional graphite. The pristine and P-doped soft carbons exhibitedsignificantly high discharge capacities of 470 and 522 mAh/g, respectively, at a high temperatureof 50°C.

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This paper was written with support from the National Research Foundation of Korea.