리튬전지용 LiNi1-xCoxO2 나노분말 제조 및 열처리
Synthesis and Heat Treatment of LiNi1-xCoxO2 Nanopowder for Lithium Batteries
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
LiNO3, Co(NO3)2, Ni(NO3)2 혼합 수용액을 출발물질로 사용하여 미세액적으로 분무시킨 후 화염분무열분해 반응에 의해 성분이 제어된 LiNi1-xCoxO2 (0≤x≤1) 분말을 합성하였다. 분말의 평균입경은 약 20 nm 였다. 또한, 화염분무열분해법으로 합성된 LiNi0.75Co0.25O2 분말의 입자형상 및 결정 구조 제어를 위해 열처리 온도 및 시간을 변화시켰다. 열처리 온도 및 시간에 비례하여 입자크기, 결정크기 및 격자상수 비의 값이 증가하였다. 또한, 분무건조를 통하여 결정성이 향상된 나노입자로 구성된 마이크론 크기의 응집체를 합성하였다.
Abstract
The composition-controlled LiNi1-xCoxO2 (0≤x≤1) cathode powders were synthesized by a flame spray pyrolysis from aqueous droplets of nitrate compounds of lithium, cobalt and nickel. The average diameter of the particles was about 20 nm. The as-prepared LiNi0.75Co0.25O2 particles were heat-treated to control the morphology and crystal structure at different calcination temperatures and heating times. The primary particle size, the crystallite size and the ratio of crystal parameters increased with an increment of the calcination temperature and heating time. Spray drying of these nanoparticles led to micron-sized aggregates with enhanced crystallinity.
참고문헌 (12)
- 윤순도, "리튬 2차전지용 양극재료 LiNi1-yCoyO2의 합성 및 전기화학적 특성 연구", 15(2), pp.170~175 (2004)
- Chen, "Preparation and properties of spherical LiNi0.75Co0.25O2 as a cathode for lithium-ion batteries", 50(2-3), pp.435~441 (2004)
- Gao, Y.,, "Novel LiNi1-xTix", 2Mgx, pp.1998, 1(3)[DOI]
- Jang, H. D.,, "Generation of silica nanoparticles from tetraethylorthosilicate vapor in a diffusion flame", 30(5), pp.477~488 (1999)
- Jang, H. D.,, "Synthesis of lithium-cobalt oxide nanoparticles by flame spray pyrolysis", 38(10), pp.1027~1032 (2004)
- Kalyani, P.,, "Studies on LiNi0.7Al0.3-xCoxO2 solid solutions as alternative cathode materials for lithium batteries", 39(1), pp.41~54 (2004)
- Lee, S.-W, "Acetate self-mixing and direct thermal reaction for preparation of LiNi0.7Co0.3O2", 50(2-3), pp.479~483 (2004)
- Liu, H.,, "Cathode materials for lithium ion batteries prepared by sol-gel methods", 8(7), pp.450~466 (2004)
- Moshtev, R.,, "Synthesis, XRD characterization, and cycling performance of cobalt doped lithium nickelates", 112(1), pp.30~35 (2002)
- Oh, S. H.,, "Electrochemical characterization of high- performance LiNi0.8Co0.2O2 cathode materials for rechargeable lithium batteries", 140(1), pp.145~150 (2005)
- T, "Comparative study of LiCoO2 LiNi1", 2Co1, pp.1993, 38[DOI]
- Pasquali, M.,, "Trends in cathode materials for rechargeable batteries. In", pp.315~360 (2004)