CAJ | 학술논문

LiCoO2是锂离子电池中最有前途的正极材料之一,近年来人们对它进行了广泛的研究.这里我们通过两种不同的湿化学方法首次合成了纳米级的LiCoO2:溶胶-凝胶法(方法B)和一种改进了的溶胶-凝胶法(方法C).为了便于比较,我们也采用了固相反应法(方法A).用DTA,IR,XRD,TEM等技术对前驱体和LiCoO2纳米颗粒进行了表征.结果表明在600℃煅烧时可以得到晶化程度较好的LiCoO2纳米颗粒.方法A和方法B得到了直径大约为100和40nm的球状颗粒,而方法C主要得到球形颗粒,同时伴有少量小棒形颗粒生成,直径约为50 nm.电化学测试表明方法C得到的产物具有最好的性能.
LiCoO2시리리자전지중최유전도적정겁재료지일,근년래인문대타진행료엄범적연구.저리아문통과량충불동적습화학방법수차합성료납미급적LiCoO2:용효-응효법(방법B)화일충개진료적용효-응효법(방법C).위료편우비교,아문야채용료고상반응법(방법A).용DTA,IR,XRD,TEM등기술대전구체화LiCoO2납미과립진행료표정.결과표명재600℃단소시가이득도정화정도교호적LiCoO2납미과립.방법A화방법B득도료직경대약위100화40nm적구상과립,이방법C주요득도구형과립,동시반유소량소봉형과립생성,직경약위50 nm.전화학측시표명방법C득도적산물구유최호적성능.
LiCoO2 is a promising positive electrode material in lithium-ion batteries, and it has been widely studied for many years. Here we prepared nanosized LiCoO2 with two different wet-chemistry methods: sol-gel process (Method B) and improved sol-gel process (Method C). And for comparison: solidstate reaction (Method A) at low temperature was applied. Precursors and powders of nanosized LiCoO2 were characterized with Differential Thermal Analysis, Infrared, X-ray Diffraction, and Transmission Electron Microscope, respectively. The results showed that good crystalline, nano-scale LiCoO2 were obtained when fired at 600℃. Method A and B produced spherical grain about 100 nm and 40 nm,while C mainly got spherical grain along with a small amount of particular stick grain, about 50 nm.Electrochemical tests showed the product of C has excellent characterization.