Abstract：Lithium cobalt oxide was synthesized by sol-gel with citric acid. The crystallization process of LiCoO2 gel precursor was studied by TG-DSC，and then it was calcined from 400 to 800 ℃. The crystal structures of LiCoO2 powders formed at different temperatures were analyzed through X-ray diffraction, Infrared spectrum, Raman spectrum and transmission electron microscope. The results show that the mean grain sizes of LiCoO2 powders are about 20-40 nm，and increase with calcinating temperature changing from 400 to 700℃, while decrease at 800 ℃. The structure changed from modified spinel to layered-rock- salt with the calcinating temperature from 400 to 800 ℃. In the modified spinel structure, Co2+ ions reside at the tetrahedral sites and Co3+ ions reside at the octahedral sites. However，in the layered-rock-salt structure, just only Co3+ ions reside at the octahedral sites.
傅秋莲1,蒋晓瑜2,陈文哲1,2*. 柠檬酸溶胶凝胶法合成LiCoO2的晶体结构研究[J]. 光谱学与光谱分析, 2008, 28(06): 1222-1226.
FU Qiu-lian1,JIANG Xiao-yu2,CHEN Wen-zhe1,2*. Study on the Structure of LiCoO2 Synthesized by Sol-Gel with Citric Acid. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(06): 1222-1226.
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