Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Study of Nanoparticle Li4Ti5O12 as Negative Electrode Material for Lithium Secondary Battery

리튬이차전지 음극재용 나노입자 Li4Ti5O12의 전기화학적 연구

  • Oh Mi-Hyun (Department of industrial Chemical Engineering, Chungbuk National University) ;
  • Kim Han-Joo (Department of industrial Chemical Engineering, Chungbuk National University) ;
  • Kim Young-Jae (Division of Battery Technology, Saehan Enertech Co. Ltd.) ;
  • Son Won-Keun (Research Center of Advanced Material, Chungnam National University) ;
  • Lim Kee-Joe (Department of Electric Engineering, Chungbuk National University) ;
  • Park Soo-Gil (Department of industrial Chemical Engineering, Chungbuk National University)
  • 오미현 (충북대학교 공업화학과) ;
  • 김한주 (충북대학교 공업화학과) ;
  • 김영재 (새한에너테크(주) 전지기술본부) ;
  • 손원근 (충남대학교 신소재연구소) ;
  • 임기조 (충북대학교 전기공학과) ;
  • 박수길 (충북대학교 공업화학과)
  • Published : 2006.02.01
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Abstract

Lithium titanium oxide $(Li_4Ti_5O_{12})$ with spinel-framework structures as anode material for lithium-ion battery was prepared by sol-gel and high energy ball milling (HEBH) method. According to the X-ray diffraction (XRD), Particle Size Analyses(PSA) and scanning electron microscopy (SEM) analysis, uniformly distributed $Li_4Ti_5O_{12}$ particles with grain sizes of 100 nm were observed. Half cells, consisting of $Li_4Ti_5O_{12}$ as working electrode and lithium foil as both counter and reference electrodes showed the high performance of high rate discharge capacity and 173 mAh/g at 0.2C in the range of $1.0\sim2.5 V$. Furthermore, the crystalline structure of $Li_4Ti_5O_{12}$ didn't transform during the lithium intercalation and deintercalation process.

리튬이온전지용 음극 활물질로 스피넬 구조의 리튬 티탄산화물$(Li_4Ti_5O_{12})$이 졸겔법과 HEBM법으로 제조되었다. 제조된 $Li_4Ti_5O_{12}$의 입자크기 및 결정구조를 확인하기 위하여 X-선 회절분석(XRD), 주사전자현미경(SEM) 및 평균입자분석(PSA)을 수행한 결과 100nm의 균일한 크기의 입자를 확인하였다. 작업전극으로 $Li_4Ti_5O_{12}$를 사용하고 기준전극과 상대전극으로 lithium 호일을 사용하여 전기화학적인 삼상전극 셀을 구성하여 전기화학적인 특성 평가를 한 결과 $1.0\sim2.5V$의 전압 범위에서 고율 충 방전 성능과 0.2C에서 173mAh/g의 용량 특성을 나타내었다. $Li_4Ti_5O_{12}$은 리튬의 삽입과 탈리가 일어나는 동안 구조적인 안정성을 보여주고 있다.

Keywords

References

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