Preparation of flexible electrothermal film by natural flake graphite spherical tail material
With the application of spherical natural graphite in the anode material of lithium-ion battery,a large number of spherical tails are produced in the process of spheroidization of natural flake graphite,which has low utilization rate and added value.In this paper,six kinds of flexible electrothermal films were prepared by mixing spherical graphite(SG8),spherical tail and carbonylated nanocellulose in different proportions.The evolution law of electric resistance,resistivity and heating rate of electrothermal film was studied by adjusting the addition amount and voltage of spherical graphite and spherical tail.The research showed that at 10V,the resistivity of the heating film with 15%content of spherical tail was 8.57mΩ/mm reaching the maximum heating temperature of 59.3℃,and the heating rate was 0.50℃/s in the first 30s.After washing,the resistivity of the heating film with 15%content of spherical tail was 9.30mΩ/mm.The maximum heating temperature was 58.6℃,and the heating rate was 0.46℃/s in the first 30s,indicating that the spherical tail material still had good flexibility and heating properties after washing.It was proved that the natural graphite spherical tail material could be used to produce flexible electric heating materials.Compared with spherical graphite,spherical tail had better electric heating properties,which provided a solution for the high-quality utilization of natural graphite spherical tail.
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