A kind of lithium-sulfur battery negative electrode material and preparation method thereof
A lithium-sulfur battery and negative electrode material technology, applied in battery electrodes, electrolyte battery manufacturing, non-aqueous electrolyte battery electrodes, etc., can solve the problems of complex operation, poor stability and continuity of lithium batteries, etc., achieve high pore volume, reduce shuttle effect, the effect of improving the conductivity of the skeleton
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Embodiment 1
[0029] Preparation of positive electrode sheet: Polynaphthalene / sulfur composite material is used as the positive electrode active material, Ketjen black ECP600JD and carbon nanofiber are combined according to the mass ratio of 1:3 as the conductive agent, polyvinylpyrrolidone and polyethyleneimine are used according to the volume The mixed system with a ratio of 2:1 is the binder.
[0030] The mass ratio of polynaphthalene / sulfur composite material, conductive agent and binder in the sulfur-containing positive electrode slurry is 8:5:1. Dissolve the mixed binder in a solvent mixed with ethylene carbonate (EC), methyl vinyl ester (MA) and trifluoropropylene carbonate (TFPC) at a volume ratio of 7:7:1 solution. Wherein, according to the mass calculation, the solvent is weighed according to the ratio of a solid content of 30%, and the solid includes a polynaphthalene / sulfur composite material and a conductive agent. Then mix the polynaphthalene / sulfur composite material and th...
Embodiment 2
[0037] Compared with Example 1, in Example 2, during the preparation process of the negative electrode sheet, the mass ratio of the steady-state lithium powder and carbon material was changed to 7:3, the heating temperature on the heating sheet was 40° C., and the heating time was 11 hours. All the other operations and explanations are the same as those in Embodiment 1.
Embodiment 3
[0039] Compared with Example 1, in Example 2, during the preparation process of the negative electrode sheet, the mass ratio of the steady-state lithium powder and the carbon material was changed to 6:5, the heating temperature on the heating plate was 60° C., and the heating time was 9 hours. All the other operations and explanations are the same as those in Embodiment 1.
[0040] Compared with ordinary lithium foil electrodes, when the negative electrodes of Examples 1, 2, and 3 use steady-state lithium powder and mixed carbon materials, the lithium-sulfur battery of the present invention can exhibit better first-time charge-discharge specific capacity, and 100 times at the same time The capacity retention after cycling is above 95.8%.
[0041] After the button batteries of each embodiment were left standing for 24 hours, an AC impedance comparison experiment was performed. Experimental results show that when Examples 1, 2 and 3 use steady-state lithium powder and mixed car...
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