도판트 프리커서의 용해도 차이에 의한 Cr-doped Li4Ti5O12의 전기화학적 특성 변화
Electrochemical Characteristic Change of Cr-doped Li4Ti5O12 due to Different Water Solubility of Dopant Precursors
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Li4Ti5O12는 우수한 안정성으로 자동차용 리튬 이온 이차전지의 음극 활물질로서 각광 받고 있다. 그러나 넓은 밴드갭에 기인한 절연체 특성으로 고율 충줆방전을 가능하게 하기 위해서는 전자 전도도의 개선이 필수적이다. 본 연구에서는 Cr 도핑을 통해 Li4Ti5O12의 전자 전도도 개선을 목표로 하였으며, wet-mixing법을 통한 물질 합성시 도판트인 Cr 프리커서의 용해도 차이에 의한 CrdopedLi4Ti5O12의 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 용해도가높은 Cr(NO3)2 프리커서로부터 합성된 경우 Bare Li4Ti5O12와 비교하여 약 2배 개선된 고율 충/방전 특성(130 mAh/g @ 10 C)을 확인하였다.
Abstract
Li4Ti5O12 (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 howevertheir 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 electrochemicalcharacteristics of conducting LTO prepared by doping with Cr3+ ions with the well-knownwet-mixing method. The solubility of dopant precursor directly affected the morphology and the phaseof doped LTO, and therefore their battery performance. In the case of employing the most solubledopant precursor, Cr(NO3)2, the doped LTO demonstrated a markedly enhanced discharge capacity athigh C-rate (130mAh/g @ 10C), which is about 2 times higher value than that of bare LTO.
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