Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Characteristics of Sn Added Li4Ti5O12 as an Anode Material

Sn이 첨가된 Li4Ti5O12 음극활물질의 전기화학적 특성

  • Jeong, Choong-Hoon (Department of Chemical Engineering, Chungbuk National University) ;
  • Kim, Sun-Ah (Department of Chemical Engineering, Chungbuk National University) ;
  • Cho, Byung-Won (Battery Research Center, KIST) ;
  • Na, Byung-Ki (Department of Chemical Engineering, Chungbuk National University)
  • Received : 2010.10.20
  • Accepted : 2011.01.05
  • Published : 2011.02.28
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Abstract

$Li_4Sn_xTi_{5-x}O_{12}$ was manufactured by high energy ball milling (HEBM) and used as an anode material for lithium ion battery. Various amount of $SnO_2$was added to $Li_4Ti_5O_{12}$ and heated at different temperatures. The purpose of this research was to see the effect of $SnO_2$ addition into $Li_4Ti_5O_{12}$. Manufactured samples were analyzed by TGA, XRD, SEM, PSA. Battery cycler was used to test the charge/discharge properties of active materials. Heat treatment temperature of $800^{\circ}C$ was needed to make a stable structure of $Li_4Sn_xTi_{5-x}O_{12}$ and the particle size distribution was $0.2{\sim}0.6\;{\mu}m$. Charge/discharge process was repeated for 50 cycles at room temperature. The initial capacity was 168mAh/g and the voltage plateau was observed at 1.55V(Li/$Li^+$).

리튬이온이차전지용 음극활물질 $Li_4Sn_xTi_{5-x}O_{12}$ 화합물을 high energy ball milling (HEBM)법을 사용하여 제조하였다. $Li_4Ti_5O_{12}$에 $SnO_2$의 첨가량을 달리하여 혼합 제조 후, 열처리를 통하여 합성하였다. 본 연구는 Sn의 첨가물에 따른 $Li_4Ti_5O_{12}$의 전기화학적 성능의 변화를 살펴보고자 하였다. 제조된 시료들의 물리적 특성을 조사하기 위해 XRD, SEM, PSA 등의 분석장비를 사용하였다. 충/방전 시험기를 사용하여 1.0~3.0 V 전압범위에서 제조된 활물질의 충/방전 특성을 알아보았다. 열처리 온도에 따라 합성한 $Li_4Sn_xTi_{5-x}O_{12}$의 구조적 특성과 전기화학적 성능을 볼 때, 합성 열처리 온도는 $800^{\circ}C$가 필요함을 확인하였으며, 합성물질 크기의 분포는 $0.2{\sim}0.6\;{\mu}m$임을 확인하였다. 충/방전 실험을 50 cycle 동안 상온에서 진행하였으며, Sn 첨가조건에 따른 가장 우수한 성능을 나타낸 초기용량은 168 mAh/g으로 측정 되었으며, 1.55 V(Li/$Li^+$) 영역에서 평탄전압을 나타내었다.

Keywords

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