PVA和热处理对溶液燃烧法合成Co3O4粉体的微观形貌及磁性能影响研究

Effects of PVA and Heat Treatment on the Morphology and Magnetic Properties of Co3O4 Synthesized by Solution Combustion

随着锂离子电池行业的迅速发展,传统方法合成钴的氧化物粉体的生产工艺已经不能满足纳米电极材料对Co3O4粉体颗粒大小及分散性的要求。本文通过研究聚乙烯醇(PVA)及热处理对溶液燃烧法合成的Co3O4粉体微观形貌和结构进行调控,并对其磁学性能进行研究。通过分析不同PVA添加量合成的Co3O4粉体产物的微观形貌得出,当PVA添加量为1.0g时,合成粉体产物的气孔数量相对较大;随后分别在600℃、700℃、800℃下热处理1h,并研究热处理后产物的磁滞曲线。当PVA添加量为1.0g,热处理温度为700℃时,合成粉体的分散性最好,颗粒尺寸在100nm左右,且矫顽力最小,剩磁最大,饱和磁化强度相对较大,分别为349.71Oe、0.181emu/g和1.43emu/g。

With the rapid development of lithium ion battery industry,the production process of cobalt oxide powder synthe sized by traditional methods has been unable to meet the requirements of particle size and dispersion of CO3O4 powder for nano meter 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 morpholo gy 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 lh respectively,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 magne tization,respectively 349.71 Oe,0.181 emu/g and 0.143 emu/g.