A kind of cathode material of lithium-sulfur battery and its application
A lithium-sulfur battery and cathode material technology, which is applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of difficult to use electrodes, and achieve the effects of high utilization rate, reduction of preparation difficulty, and inhibition of sulfur shuttle effect.
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Embodiment 1
[0030] Self-made PS by free radical living polymerization 100 -b-PHFBA 300 As a cathode binder for lithium-sulfur batteries. The binder and N-methylpyrrolidone are formulated into a mixed solution with a mass fraction of 5%. After mixing the sulfur powder, conductive agent and binder uniformly at a mass ratio of 6:2:2, a positive electrode slurry is made, and then the positive electrode slurry is evenly spread on the current collector to make a positive electrode sheet. The positive electrode sheet was heated in a vacuum drying oven to remove the solvent, and the temperature in the vacuum drying oven was 60° C. for 12 hours. The positive electrode was cut into discs of a certain size, and assembled into a full battery in a glove box. See Table 1 for the initial specific capacity and the specific capacity after 100 cycles at a current density of 0.2C.
Embodiment 2
[0032] Self-made PS by free radical living polymerization 100 -b-PHFBA 300 -b-PS 100 As a cathode binder for lithium-sulfur batteries. The binder and N-methylpyrrolidone are formulated into a mixed solution with a mass fraction of 5%. Mix the sulfur powder, conductive agent and binder uniformly at a mass ratio of 7:2.5:0.5 to make a positive electrode slurry, and then apply the positive electrode slurry evenly on the current collector to make a positive electrode sheet. The positive electrode sheet was heated in a vacuum drying oven to remove the solvent, and the temperature in the vacuum drying oven was 60° C. for 12 hours. The positive electrode was cut into discs of a certain size, and assembled into a full battery in a glove box. See Table 1 for the initial specific capacity and the specific capacity after 100 cycles at a current density of 0.2C.
Embodiment 3
[0034] Homemade PDMAA by Free Radical Living Polymerization 200 -b-PTFEA 600 -b-PDMAA 200 As a cathode binder for lithium-sulfur batteries. The binder and N-methylpyrrolidone are formulated into a mixed solution with a mass fraction of 5%. After mixing the sulfur powder, conductive agent and binder uniformly at a mass ratio of 7:2:1, a positive electrode slurry is made, and then the positive electrode slurry is evenly spread on the current collector to make a positive electrode sheet. The positive electrode sheet was heated in a vacuum drying oven to remove the solvent, and the temperature in the vacuum drying oven was 60° C. for 12 hours. The positive electrode was cut into discs of a certain size, and assembled into a full battery in a glove box. See Table 1 for the initial specific capacity and the specific capacity after 100 cycles at a current density of 0.2C.
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