A kind of preparation method of lithium-sulfur battery composite cathode material
A composite positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity, lack of adsorption performance, etc., and meet the requirements of simple equipment, good stability, and high specific surface area Effect
Active Publication Date: 2020-08-04
芩天能源(上海)有限公司
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Problems solved by technology
However, long-term cycling stability and high-rate emission are still challenging, mainly attributed to low electrical conductivity and lack of adsorption performance, which are far from satisfactory
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Embodiment 1
[0062] This embodiment provides a preparation method of a novel lithium-sulfur battery composite positive electrode material, the steps are as follows:
[0063] Step 1, 42.5mg of pyromellitic dianhydride (C 10 h 2 o 6 ), 52.7mg of s-tris(4-(p-aminophenyl)-phenyl)benzene (C 42 h 33 N 3 ), 47.6mg of polyaniline, add 4mL of dioxane, 0.5mL of 3mol / L acetic acid, put into a 10mL heat-resistant glass reaction tube, and ultrasonically disperse for 5 minutes to form a suspension A;
[0064] Step 2: Suspension A undergoes 5 liquid nitrogen freezing-vacuumizing-degassing steps, seals it, puts it into a microwave reactor, and reacts at 130 degrees for 1 hour to obtain crude product B; after centrifuging the crude product, collect The insoluble matter was washed three times with 10ml of tetrahydrofuran and 10ml of toluene solvent respectively, and dried to obtain crude product C;
[0065] In step 3, the crude product C was used as a precursor, and was directly carbonized at 800° C. ...
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Abstract
The invention discloses a preparation method of a composite positive electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of performing heating and carbonization on TpPa-COF in a nitrogen atmosphere to obtain N-GC-TpPa; performing mixing and grinding on the obtained N-GC-TpPa and sulfur, and performing heating on the mixture in an argon environment to obtain a compound N-GC-TpPa / S; and performing mixing on the compound N-GC-TpPa / S and poly(difluorovinyl) based on a proportion, then adding a solvent to form paste, and coating an aluminum current collector with the paste and performing drying to obtain the composite positive electrode material of the lithium-sulfur battery. The electrode material prepared by the method has a porous structure and quite large specific surface area; meanwhile, by virtue of the micropore structure of the composite material, diffusion of lithium polysulfide can be well suppressed, thereby improving the electrochemical performance of the battery; and therefore, the composite positive electrode material is an excellent electrode material of the lithium-sulfur battery.
Description
technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium-sulfur batteries, and in particular relates to a preparation method of composite positive electrode materials for lithium-sulfur batteries. Background technique [0002] Lithium-sulfur battery (LSB) is a new type of high-performance energy storage battery with high theoretical specific capacity (1675mAh g-1), high energy density (2600Wh kg-1), environmental friendliness, and low price. These features make it important in the field of electric vehicles and portable devices. [0003] To address these challenges, various experiments have been carried out to enhance the electrochemical performance of LSBs by enhancing the conductivity of elemental sulfur and suppressing the shuttling effect. Among these approaches, the encapsulation of sulfur composites in carbon materials with high electrical conductivity and various nanostructures has proven to be an ...
Claims
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IPC IPC(8): H01M4/38
CPCH01M4/382Y02E60/10
Inventor 魏浩丁宇森扶静王婉晴智侃茹郭彬斌王政
Owner 芩天能源(上海)有限公司