Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Preparation of Expanded Graphite using Perchloric Acid and It's Application as Anode Materials for High Power Li-ion Secondary Battery

과염소산을 이용한 팽창흑연의 제조 및 고출력 리튬이온전지 음극재로의 응용

  • Park, Yul-Seok (Department of Nano Science and Engineering, Myongji University) ;
  • Zheng, Hua (Department of Nano Science and Engineering, Myongji University) ;
  • Kim, Myung-Soo (Department of Chemical Engineering, Myongji University)
  • 박율석 (명지대학교 나노공학과) ;
  • 정화 (명지대학교 나노공학과) ;
  • 김명수 (명지대학교 화학공학과)
  • Received : 2011.02.17
  • Accepted : 2011.03.14
  • Published : 2011.03.30
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Abstract

Expanded graphites were used as anode materials of high power Li-ion secondary battery. The expanded graphite was prepared by mixing the graphite with $HClO_4$ as a intercalation agents and $KMnO_4$ as a oxidizing agents. The physical and electrochemical properties of prepared expanded graphites through the variation of process variables such as contents of intercalation agent and oxidizing agent, and heat treatment temperature were analyzed for determination of optimal conditions as the anode of high power Li-ion secondary battery. After examing the electrochemical properties of expanded graphites at the different preparing conditions, the optimal conditions of expanded graphite were selected as 8 wt.% of oxidizing agent, 400 g of intercalation agent for 20 g of natural graphite, and heat treatment at $1000^{\circ}C$. The sample showed the improved charge/discharge characteristics such as 432 mAh/g of initial reversible capacity, 88% of discharge rate capability at 10 C-rate, and 24 mAh/g of charge capacity at 10 C-rate. However, the expanded graphite had the problems of potential plateaus like natural graphite and lower initial efficiency than the natural graphite.

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References

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