졸-겔법으로 합성합 Cr 첨가 Li_(4)Ti_(5)O_(12)의 전기화학적 특성
Electrochemical Characteristics of Cr Added Li_(4)Ti_(5)O_(12) Prepared by Sol-gel Method
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초록
Cr을 첨가한 Li_(4)Ti_(5)O_(12)의 전기화학적 특성을 고찰하였다. 산화물에 금속원자가 치환될 경우에결정구조가 변화되며, Li_(4)Ti_(5)O_(12)의 전기화학적 특성이 변화하게 된다. 졸-겔법을 이용하여Li_(4)Ti_(5−x)Cr_(x)O_12(x = 0~0.2)를 제조하였으며, 전기로에서 800~850oC로 공기중에서 12시간 동안열처리하였다. 시료의 물리적인 특성은 TG-DTA, XRD, SEM, FT-IR을 사용하여 측정하였으며,전기화학적인 특성은 0.01~2.0 V의 범위에서 배터리충방전기를 사용하여 측정하였다. Li_(4)Ti_(5)O_(12)는1C에서 169.9 mAh/g의 용량을 나타내었으며, 0.1C로 변화되었을 경우에 초기용량의 97.5%를나타내었다. Li_(4)Ti_(4.9)Cr_(0.1)O_(12) 시료는 1C에서 193.8 mAh/g의 용량을 보였으며, 0.1C에서는 초기용량의 98.8%를 나타내었다.
Abstract
The electorchemical properties of Li_(4)Ti_(5)O_(12) added with Cr was tested. The addition or substitution of atoms to Li_(4)Ti_(5)O_(12) are expected to modify the crystal structure, and therefore to change the electrochemical performances of Li4Ti5O12. After the spinel structure Li_(4)Ti_(5−x)Cr_(x)O_12(x = 0~0.2) were obtained via sol-gel method, the gel was heated in a muffle furnace at 800~850oC for 12 h in air. The physical properties of the samples were characterized by TG-DTA,XRD, SEM, FT-IR, and the electrochemical properties were tested with battery cycler at 0.01~2.0 V range. The Li_(4)Ti_(5)O_(12) exhibited 169.9 mAh/g at 1C and capacity recovery was 97.5%of the initial capacity at 0.1C. Li_(4)Ti_(4.9)Cr_(0.1)O_(12)(Cr 1% added) showed best performance of 193.8 mAh/g at 1C and the capacity recovery was increased to 98.8% of the initial capacity at 0.1C.
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