Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Characteristic Change of Cr-doped Li4Ti5O12 due to Different Water Solubility of Dopant Precursors

도판트 프리커서의 용해도 차이에 의한 Cr-doped Li4Ti5O12의 전기화학적 특성 변화

  • Yun, Su-Won (School of Mechanical Engineering, Pusan National University) ;
  • Song, Hannah (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Yong-Tae (School of Mechanical Engineering, Pusan National University)
  • 윤수원 (부산대학교 기계공학부 에너지시스템전공) ;
  • 송한나 (부산대학교 기계공학부 에너지시스템전공) ;
  • 김용태 (부산대학교 기계공학부 에너지시스템전공)
  • Received : 2014.11.14
  • Accepted : 2015.02.01
  • Published : 2015.02.28
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Abstract

$Li_4Ti_5O_{12}$ (LTO) have attracted much attention of researchers in the field of energy storage, because of their excellent stability for electric vehicle application. A main drawback of LTO is however their insulating nature due to the wide bandgap, which should be addressed to enhance the battery performance. In this study, we investigated the effect of water solubility of dopant precursor on the electrochemical characteristics of conducting LTO prepared by doping with $Cr^{3+}$ ions with the well-known wet-mixing method. The solubility of dopant precursor directly affected the morphology and the phase of doped LTO, and therefore their battery performance. In the case of employing the most soluble dopant precursor, $Cr(NO_3)_2$, the doped LTO demonstrated a markedly enhanced discharge capacity at high C-rate (130mAh/g @ 10C), which is about 2 times higher value than that of bare LTO.

$Li_4Ti_5O_{12}$는 우수한 안정성으로 자동차용 리튬 이온 이차전지의 음극 활물질로서 각광 받고 있다. 그러나 넓은 밴드갭에 기인한 절연체 특성으로 고율 충/방전을 가능하게 하기 위해서는 전자 전도도의 개선이 필수적이다. 본 연구에서는 Cr 도핑을 통해 $Li_4Ti_5O_{12}$의 전자 전도도 개선을 목표로 하였으며, wet-mixing법을 통한 물질 합성시 도판트인 Cr 프리커서의 용해도 차이에 의한 Cr-doped $Li_4Ti_5O_{12}$의 전기화학적 특성 변화를 고찰하고자 하였다. 시료의 물리적 특성은 ICP, XRD, SEM, EXAFS을 통하여 확인하였고 1.0V~3.0V (vs. $Li/Li^+$) 하에서 충/방전 특성을 조사하였다. 프리커서의 용해도는 합성된 물질의 상(phase) 및 모폴로지에 큰 영향을 미쳤으며, 가장 용해도가 높은 $Cr(NO_3)_2$ 프리커서로부터 합성된 경우 Bare $Li_4Ti_5O_{12}$와 비교하여 약 2배 개선된 고율 충/방전 특성(130 mAh/g @ 10 C)을 확인하였다.

Keywords

References

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