A positive electrode material for lithium-sulfur battery, preparation method thereof, and lithium-sulfur battery containing the same
A cathode material, lithium-sulfur battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of short cycle life and fast capacitance decay, and achieve low cost, high production efficiency and low price. Effect
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[0053] As mentioned above, the present invention provides a positive electrode material for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery containing the positive electrode material.
[0054] Specifically, the present invention provides a method for preparing a positive electrode material for a lithium-sulfur battery, wherein the positive electrode material is a carbon / metal oxide / sulfur ternary composite material (referred to as S / metal oxide@C); The ternary composite material is prepared by a hydrothermal method, wherein carbon-containing biomass material (specifically such as yeast) is used as a carbon precursor. Further, a metal salt is used as a metal oxide precursor.
[0055] In a preferred embodiment of the present invention, described method comprises the following steps:
[0056] 1) Using yeast and metal salts as raw materials, an amorphous carbon-metal ion complex is prepared by hydrothermal method, which is recorded as intermed...
Embodiment 1
[0085] S / MnO 2 @C
[0086] 1. The preparation method of the ternary composite positive electrode material: the carbon precursor yeast and the metal oxide precursor MnCl 2 Mix according to the mass ratio of 1:0.05, the specific operation steps are as follows: wash 4g of yeast with deionized water, disperse in 40mL of deionized water, add 2g of sodium chloride, 100μL of glutaraldehyde and 0.2g of metal oxide Precursor MnCl 2 , put into a 100mL beaker and stir evenly. Transfer the above solution into a polytetrafluoroethylene-lined autoclave and react at 180°C for 8 hours. After the reaction, collect it by centrifugation and wash it with water for 3 times and ethanol for 3 times. The collected precipitate is put into an oven for 45 ℃ drying for 8h, to obtain the intermediate product a. After cooling to room temperature, it was placed in a tube furnace under an inert atmosphere at 900°C for 6 hours to obtain the intermediate product b (denoted as MnO 2@C). After cooling and ...
Embodiment 2
[0097] S / ZnO@C
[0098] 1. The preparation method of the ternary composite positive electrode material: mix the carbon precursor yeast and the metal oxide precursor zinc acetate according to the mass ratio of 1:0.1. Wash and disperse in 40mL deionized water, add 2g sodium chloride, 100μL glutaraldehyde and 0.4g metal oxide precursor zinc acetate, put into a 100mL beaker and stir at room temperature for 30min to disperse evenly. Transfer the above solution into a polytetrafluoroethylene-lined autoclave and react at 200°C for 6 hours. After the reaction, collect it by centrifugation and wash it with water for 3 times and ethanol for 3 times. The collected precipitate is put into an oven for 80 ℃ dry 4h. The intermediate product a is obtained. Cool to room temperature and put it into a tube furnace under an inert atmosphere at 700°C for 4 hours to obtain intermediate product b. After it is cooled and weighed, add sulfur according to the mass ratio of carbon / metal oxide to sulf...
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