Conductive polymer coated carbon-sulfur composite positive electrode, preparation method thereof and secondary battery
A conductive polymer and composite positive electrode technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, battery electrodes, etc., can solve the problem of irreversible loss of active materials, achieve the effects of improving cycle performance, increasing specific capacity, and reducing loss
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Embodiment 1
[0036] 1) Preparation of carbon nanotube sponge: put carbon nanotubes and sodium dodecylsulfonate surfactant in a container, put them in an ultrasonic disperser to form a suspension, and the mass fraction of carbon nanotubes in the suspension is 10mg / ml, the mass ratio of surfactant and carbon nanotubes is 5:1, and then placed for 12h to form a gel; the gel is placed in a water bath containing 5% by mass of polyvinyl alcohol at 90°C for solvent exchange. Exchange for 3 days, and change the polyvinyl alcohol aqueous solution once a day; put the gel in liquid nitrogen for quick freezing, and place it in a freeze dryer for 12 hours; finally place the gel in liquid carbon dioxide for 10 minutes, and take it out to obtain a carbon nanotube sponge .
[0037] 2) Preparation of carbon nanotube sponge-sulfur composite material: in an argon atmosphere, put carbon nanotube sponge and sublimated sulfur (analytical pure) into a polytetrafluoroethylene reactor at a mass ratio of 1:5, and th...
Embodiment 2
[0041] 1) Preparation of carbon nanotube sponge-sulfur composite material: In an argon atmosphere, put carbon nanotube sponge and sublimated sulfur (analytical pure) in a 1:5 mass ratio into a polytetrafluoroethylene reactor, and then continue to feed Exhaust the air in the reactor with nitrogen for 30 minutes; under the flowing argon atmosphere, heat the mixture of carbon nanotube sponge and elemental sulfur to about 120°C, keep at this temperature for 2h, then heat to about 150°C for 1h, and then cool down to After 120°C, heat to 150°C, keep at this temperature for 1 hour, repeat several times to fully melt the sulfur and diffuse into the carbon nanotube sponge, and cool naturally to obtain a carbon-sulfur composite positive electrode based on the carbon nanotube sponge.
[0042] 2) Others are the same as in Embodiment 1.
Embodiment 3
[0044]Preparation of carbon-sulfur conductive polymer composite positive electrode: Pour aniline and sulfosalicylic acid into a three-necked flask at a mass ratio of 1:0.5, add hydrochloric acid to adjust the pH to 1.0, and add the prepared carbon nanotubes to it after ultrasonication for a period of time The sponge-sulfur composite material makes the mass ratio of the carbon nanotube sponge-sulfur composite material to aniline 28. At the same time, a certain amount of ammonium persulfate was dissolved in deionized water, and slowly added dropwise to the above reaction system with a dropping funnel under nitrogen protection and an ice-water bath. The dropping time was about 4 hours, so that the mass ratio of ammonium persulfate to aniline After reacting for 12 hours, the obtained product was washed with deionized water, methanol, and acetone in sequence, and dried in vacuum at 60°C for 25 hours to obtain a carbon nanotube sponge-sulfur-polyaniline composite positive electrode. ...
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