Sn이 첨가된 Li_(4)Ti_(5)O_(12) 음극활물질의 전기화학적 특성
Electrochemical Characteristics of Sn Added Li_(4)Ti_(5)O_(12) as an Anode Material
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리튬이온이차전지용 음극활물질 Li_(4)Sn_(x)Ti(5−x)O_(12) 화합물을 high energy ball milling (HEBM)법을사용하여 제조하였다. Li_(4)Ti_(5)O_(12)에 SnO_2의 첨가량을 달리하여 혼합 제조 후, 열처리를 통하여합성하였다. 본 연구는 Sn의 첨가물에 따른 Li_(4)Ti_(5)O_(12)의 전기화학적 성능의 변화를 살펴보고자하였다. 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 특성을알아보았다. 열처리 온도에 따라 합성한 Li_(4)Sn_(x)Ti(5−x)O_(12)의 구조적 특성과 전기화학적 성능을 볼 때,합성 열처리 온도는 800oC가 필요함을 확인하였으며, 합성물질 크기의 분포는 0.2~0.6 μm임을 확인하였다. 충/방전 실험을 50 cycle 동안 상온에서 진행하였으며, Sn 첨가조건에 따른 가장 우수한성능을 나타낸 초기용량은 168 mAh/g으로 측정 되었으며, 1.55 V(Li/Li+) 영역에서 평탄전압을나타내었다.
Abstract
Li_(4)Sn_(x)Ti(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_(4)Ti_(5)O_(12) and heated at different temperatures. The purpose of this research was to see the effect of SnO_2addition into Li_(4)Ti_(5)O_(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 800oC was needed to make a stable structure of Li_(4)Sn_(x)Ti(5−x)O_(12) and the particle size distribution was 0.2~0.6 μm. 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+).
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