Carbon-sulfur composite cathode material and preparation method thereof, cathode and lithium-sulfur battery
A cathode material and carbon-sulfur composite technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of increasing the service life of lithium-sulfur batteries, achieve the effect of improving adsorption strength and cycle stability
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[0024] In the second aspect of the present invention, there is also provided a method for preparing a carbon-sulfur composite positive electrode material, the preparation method comprising: S1, preparing a hierarchical porous carbon material, wherein microscopic particles with a pore diameter of less than 2 nm are formed in the hierarchical porous carbon material. Pores, and mesopores with a pore diameter of 2-50nm, wherein the ratio of the total pore volume of the mesopores to the total pore volume of the micropores is between 0.3-2; S2, mechanically mixing the hierarchical porous carbon material, solution One of compounding method, melting method, in-situ reaction compounding method, gel precipitation compounding method, gas-phase sulfur filling method or decompression gas-phase sulfur filling method is filled with elemental sulfur, so that the sulfur content therein is 10-90% by weight.
[0025] According to the method of the present invention, the hierarchically porous carb...
Embodiment 1
[0057] It is used to illustrate the carbon-sulfur composite positive electrode material and its preparation method, positive electrode and lithium-sulfur battery of the present invention.
[0058] (1) Preparation of hierarchical porous carbon materials:
[0059]Potassium hydroxide (purity is 85% by weight, where pure potassium hydroxide is represented by KOH) is dissolved in water to form an aqueous solution of KOH; lignite (produced from Hulunbuir, volatile matter content is 36% by weight) is added in the aforementioned aqueous solution of KOH (The weight ratio of lignite to KOH is 1:4), and the water is evaporated by magnetic stirring at 100° C. to obtain a mixture with a water content of less than 5% by weight. The aforementioned mixture was transferred to a tube furnace, nitrogen gas was continuously introduced at a rate of 1000ml / L, and the temperature was raised to 750°C at a rate of 5 °C / min, and then heated at a constant temperature for 1 hour to obtain a reaction prod...
Embodiment 2
[0068] It is used to illustrate the carbon-sulfur composite positive electrode material and its preparation method, positive electrode and lithium-sulfur battery of the present invention.
[0069] (1) Preparation of hierarchical porous carbon materials:
[0070] Sodium hydroxide (purity is 96% by weight, wherein pure sodium hydroxide is represented by NaOH) is dissolved in water to form an aqueous solution of NaOH; bituminous coal (produced in Pingdingshan, Henan, volatile matter content is 20% by weight) is added to the aqueous solution of NaOH medium (the weight ratio of bituminous coal to NaOH is 1:5), the water is evaporated by magnetic stirring at 100°C to obtain a mixture with a water content of less than 5% by weight. The aforementioned mixture was transferred to a tube furnace, nitrogen gas was continuously introduced at a rate of 800ml / L, and the temperature was raised to 800°C at a rate of 10°C / min, and then heated at a constant temperature for 1 hour to obtain a rea...
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Abstract
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