WEI Yupeng, FENG Shaochen, ZHAO Feiyun, SHENG Yongqian, LI Qinglin, MA Jiqiang, WANG Haiyan
(College of Material Science and Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Abstract: With the rapid development of lithium ion battery industry, the production process of cobalt oxide powder synthesized by traditional methods has been unable to meet the requirements of particle size and dispersion of Co3O4 powder for nanometer electrode materials. In this paper, the micro morphology and structure of Co3O4 powder synthesized by solution combustion were regulated by studying PVA and heat treatment, and its magnetic properties were studied. By analyzing the micro morphology of Co3O4 powder products synthesized by different PVA addition amounts, it is concluded that when the PVA addition amount is 1.0 g, the number of pores in the synthetic powder products is relatively large. Then heat treatment was conducted at 600 , 700 ℃ and 800 ℃ for 1h re ℃ spectively, and hysteresis curves of products after heat treatment were studied. When the addition of PVA was 1.0 g and the heat treatment temperature was 700 , ℃the dispersion of the synthetic powder was the best, with particle size around 100 nm, minimum coercive force, maximum residual magnetism and relatively large saturation magnetization, respectively 349.71 Oe, 0.181 emu/g and 0.143 emu/g.
Key words: Co3O4 nano-powder; polyvinyl alcohol (PVA); heat treatment; micromorphology; magnetic properties