ISSN: 0304-128X ISSN: 2233-9558
Copyright © 2024 KICHE. All rights reserved

Articles & Issues

Language
english
Conflict of Interest
In relation to this article, we declare that there is no conflict of interest.
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright © KIChE. All rights reserved.

All issues

산화주석에 의해 표면개질된 리튬이차전지용 흑연 재료의 전기화학적 특성

The Electrochemical Characteristics of Surface Modified Graphite Materials by Tin-oxide for Lithium Secondary Batteries

순천대학교 공과대학 화학공학과 & 나노기술센터, 전남 540-742 1삼성 SDI, 충남 330-300
Department of Chemical Engineering, Nanotechnology Center, Sunchon National University, Chonnam 540-742, Korea 1Energy Lab., CRD center, Samsung SDI, Sungsung-dong, Chonan, Chungnam 330-300, Korea
HWAHAK KONGHAK, February 2002, 40(1), 88-92(5), NONE
downloadDownload PDF

Abstract

주석산화물을 spray dryer 방법으로 흑연재료의 표면에 석출하여 리튬이차전지의 음극활물질을 제조하고 그 전기화학적 특성을 조사하였다. TGA/DSC 열분석을 통해 염화주석의 주석산화물로의 산화반응이 470 ℃에서 일어남을 알 수 있었다. 음극활물질의 세공구조 및 표면특성은 XRD, SEM, EPMA 분석을 통해 알아보았디. 또한 제조된 음극활물질의 전기화학적 특성은 1 M의 LiClO4-EC/DEC(1 : 1) 용액을 전해질로 이용하여 조사하였다. Spray dryer 방법에 의하여 흑연시료 상에 균일하게 분산된 주석산화물의 미세 입자를 얻을 수 있었다. 표면에 주석산화물이 석출된 천연흑연의 충ㆍ방전 용량은 염화주석을 첨가하지 않는 천연흑연보다 고용량을 가졌다. 또한, 표면에 석출된 주석산화물의 양이 증가할수록 방전용량은 크게 나타나지만 효율이 감소하는 것을 알 수 있었다. 이것은 주석의 양이 많아질수록 형성되는 LiO2의 양이 많아져 소모되는 Li(+) 이온이 많아진 것으로 사료된다.
The graphite materials were coated with tin oxide by spray dryer method and their coating effects on the electrochemical behaviors were investigated for improving performance of carbon negative electrode in lithium secondary battery. TGA/DSC thermal analyses of SnCl2 showed that the oxidation reaction of SnCl2 into tin oxide is occurred at 470 ℃. The microstructure and surface properties of the prepared negative electrode materials were discussed on the basis of XRD, SEM, EPMA analyses. Their electrochemical behaviors were also investigated in 1 M LiClO4-EC/DEC(1 : 1) solution at the room temperature. It was possible to obtain fine particle of tin-oxide uniformly dispersed on graphite substrate such as natural graphite and graphite fiber powder using spray dryer method. Natural graphite electrode coated with tin-oxide had the higher charge/discharge capacity than that of raw materials. Its charge capacity value increased with an increase in the tin-oxide content. However, the efficiency decreased with an increase in the tin-oxide content. This is thought that Li+ ion is much consumed because the more tin-oxide, the more LiO2 content.

References

Dominey LA, "Lithium Batteries," ed. Elsevier Science B.V., Netherlands (1994)
Rao BML, J. Electrochem. Soc., 124, 1490 (1977) 
Beck JR, Rommers PJ, Proc. 11th International Power Sources Symp., 37, Brigton (1978)
Kim HJ, Lee CT, J. Korean Ind. Eng. Chem., 9(7), 1059 (1998)
Kim HJ, Lee CT, J. Korean Ind. Eng. Chem., 9(7), 1065 (1998)
Nagaura T, Tazawa K, Prog. Batteries Sol. Cells, 9, 20 (1990)
Idota Y, Kubota T, Matsufuji A, Maekawa Y, Miyasaka T, Science, 276(5317), 1395 (1997) 
Liu WF, Huang XJ, Wang ZX, Li H, Chen LQ, J. Electrochem. Soc., 145(1), 59 (1998) 
Li H, Huang X, Chen L, J. Power Sources, 81, 335 (1999) 
Besenhard JO, Yang J, Winter M, J. Power Sources, 68(1), 87 (1997) 
Aurbach D, Eineli Y, Chusid O, Carmeli Y, Babai M, Yamin H, J. Electrochem. Soc., 141(3), 603 (1994) 
Winter M, Novak P, Monnier A, J. Electrochem. Soc., 145(2), 428 (1998) 
Courtney IA, Dahn JR, J. Electrochem. Soc., 144(6), 2045 (1997) 

The Korean Institute of Chemical Engineers. F5, 119, Anam-ro, Seongbuk-gu, 233 Spring Street Seoul 02856, South Korea.
Phone No. +82-2-458-3078FAX No. +82-507-804-0669E-mail : kiche@kiche.or.kr

Copyright (C) KICHE.all rights reserved.

- Korean Chemical Engineering Research 상단으로