- Previous Article
- Next Article
- Table of Contents
Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.3, 491-495, May, 1999
리튬전지용 Ni0.2V2O5 Aerogel 전극의 특성
Electrochemical Studies of Li Intercalation in Ni0.2V2O5 Aerogel
초록
졸겔법에 의하여 리튬전지용 Ni0.2V2O5 aerogel (ARG) 양극 소재를 개발하여 전기화학적 특성을 조사하였다. ARG는 무정형의 층상화합물로 400℃ 이상에서 열처리할 경우 orthorhombic 구조로 전화되었으며, 표면구조는 섬유 모양의 단위체가 서로 얽혀 일정한 방향으로 성장하여 비등방성 sheet를 형성하고 있다. 리튬 이온이 층간 삽입될 수 있는 다수의 특정한 에너지 준위의 자리가 ARG에 존재하며, 전지의 평균전위는 3.1V(vs. Li/Li+)이었다. ARG 리튬이차전지의 계면저항은 ARG층 내 리튬 몰분율에 상관없이 일정한 반면, 전하이동저항은 개로전압에서 최대이며 ARG내 리튬 이온의 농도가 증가할수록 증가하였다.
Ni0.2V2O5 aerogel (ARG) was synthesized via the sol gel method and has been studied with an emphasis on the characterization of its electrochemical properties. ARG appear to be amorphous layered material. Electron micrograph revealed that entangled fibrous textures has been grown to form anisotropic corrugated sheets. Several sites for the Li ion intercalation exist between the layers of ARG and average cell potential was 3.1 V vs. Li/Li+. The charge transfer resistance increases 3 to 4 times as lithium composition increases, but the interphase resistance remains almost constant regardless of the lithium composition in the ARG.
- Xing WB, Xue JS, Zheng T, Gibaud A, Dahn JR, J. Electrochem. Soc., 143(11), 3482 (1996)
- Yu P, Ritter JA, White RE, Popov BN, J. Electrochem. Soc., 147(6), 2081 (2000)
- Thackeray MM, Mansuetto MF, Bates JB, J. Power Sources, 68(1), 153 (1997)
- Passerini S, Chang D, Chu X, Le DB, Smyrl WH, Chem. Mater., 7, 780 (1995)
- Park HK, Smyrl WH, Ward MD, J. Electrochem. Soc., 142(4), 1068 (1995)
- Aldebert P, Baffier N, Gharbi N, Livage J, Mater. Res. Bull., 16, 669 (1981)
- Livage J, Mater. Res. Bull., 26, 1173 (1991)
- Znaidi L, Baffier N, Huber M, Mater. Res. Bull., 24, 1501 (1989)
- Yao T, Oka Y, Yamamoto N, J. Mater. Chem., 2, 331 (1992)
- Bard AJ, Faulkner LR, "Electrochemical Methods," 718, John Wiley & Sons, New York (1980)
- McKinnon WR, Haering RR, "Modern Aspect of Electrochemistry," 15, 235 (1983)
- West K, Zachau-Chriatiansen B, Jacobsen T, Skaarup S, Electrochim. Acta, 38, 1215 (1993)