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Self-supporting electrode, preparation method thereof and lithium-sulfur battery

A self-supporting electrode and lithium-sulfur battery technology, applied in lithium batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of battery energy density and power density decrease, battery energy density decrease, electrode preparation cost increase, etc., to achieve Effects of increasing surface load, improving electrical conductivity, improving sulfur utilization and electrochemical performance

Active Publication Date: 2022-04-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the mass ratio of binder, conductive agent and current collector in the traditional coating electrode preparation method, the loading capacity of sulfur per unit area of ​​the active material of lithium-sulfur battery is low (less than 3mg / cm 2 ), and the preparation of thicker electrodes requires higher-quality additives, resulting in a decrease in the energy density and power density of the battery and poor electrochemical performance. Therefore, this method requires more current collectors and electrolytes etc., and the process is cumbersome, which leads to the increase of electrode preparation cost and the decrease of battery energy density.

Method used

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  • Self-supporting electrode, preparation method thereof and lithium-sulfur battery
  • Self-supporting electrode, preparation method thereof and lithium-sulfur battery
  • Self-supporting electrode, preparation method thereof and lithium-sulfur battery

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preparation example Construction

[0038] The invention provides a self-supporting electrode, a preparation method thereof and a lithium-sulfur battery. A kind of preparation method of self-supporting electrode comprises the following steps:

[0039] S1: Pretreat flake biomass, the specific pretreatment process includes cutting, acid leaching, boiling and drying. The function of pretreatment is mainly to cut the irregular biomass raw materials into discs, and remove impurity molecules in the biomass materials by acid leaching and boiling.

[0040] Wherein, the biomass is one or more sheet-like biomass containing lignin, cellulose, hemicellulose, polysaccharide, polyalcohol or seaweed.

[0041] S2: The transition metal-containing microwave absorber and the conductive modifier are loaded on the surface of the sheet-shaped biomass pretreated in step S1, and the way of impregnation loading can be adopted.

[0042] The transition metal-containing microwave absorber is at least one of soluble salts of cobalt, zinc,...

Embodiment 1

[0055] A method for preparing a self-supporting electrode, comprising the following steps:

[0056] The pomelo peel slices were cut into discs with a thickness of 1 cm and a diameter of 16 mm. After acid leaching, boiling, and drying, 500 g of dried pomelo peel slices were added to a mixture containing 5 g of graphene and 10 g of microwave adsorbent Ni(NO 3 ) 2 N was introduced into the homogeneous solution of 2 protection, and then put it into a microwave digestion apparatus, and apply a uniform magnetic field of 200mT to carry out microwave reaction. The power and frequency of the microwave are 1kW and 2450Mkz respectively, and the temperature control mode is used to set the reaction temperature to 300°C, and the pyrolysis takes 30 minutes, so that the impurities in the grapefruit peel are completely decomposed, and the graphene and Ni ions are uniformly loaded on the carbon substrate and modification; turn off the microwave, and after the reactor is cooled to room tempera...

Embodiment 2

[0058] A method for preparing a self-supporting electrode, comprising the following steps:

[0059] Cut the Bamu chips into discs with a thickness of 1cm and a diameter of 16mm, pickle, boil, and dry, and add 500g of dried Bamu chips to a uniform solution containing 50g graphene and 5g microwave adsorbent manganese chloride Ar protection was passed through the medium, and then put into a microwave digestion apparatus, and a uniform magnetic field of 200mT was applied to carry out microwave reaction. The power and frequency of the microwave are 2kW and 915Mkz respectively, and the temperature control mode is used to set the reaction temperature at 200°C, and the pyrolysis takes 10 minutes to completely decompose the impurities in the Bamu chips, so that the graphene and Mn ions are evenly loaded on the carbon matrix and modification; turn off the microwave, and after the reactor is cooled to room temperature, take out the reactor, wash and dry, and carry out chemical sulfur loa...

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Abstract

The invention provides a self-supporting electrode and a preparation method thereof and a lithium-sulfur battery, and the preparation method of the self-supporting electrode comprises the following steps: loading a microwave absorbent containing transition metal and a conductive modifier on the surface of biomass; placing the treated biomass material in a magnetic field and a microwave field, and carrying out hydrothermal reaction to obtain a matrix electrode; and carrying out sulfur loading treatment on the obtained matrix electrode to obtain the self-supporting electrode. According to the preparation method, the self-supporting electrode is prepared by adopting uniform magnetic field induction to assist one-step microwave hydrothermal, and compared with preparation of other electrode materials, the prepared electrode material has the advantages that addition of a binder, a conductive agent and the like is avoided, and the method is simple, convenient, efficient, mild in condition, low in cost, energy-saving, environment-friendly, high in independence and capable of being produced in batches. Compared with a coated electrode, the surface loading capacity of sulfur of the electrode material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and relates to a self-supporting electrode, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] With the comprehensive development of technology and information technology, the era of big data and artificial intelligence is coming, intelligent electronic equipment and informatization provide convenience and colorful life styles for human society. People's dependence on portable smart devices is gradually increasing, and energy storage devices with high energy density and power density have gradually become one of the most important issues people face. Lithium-sulfur battery is a new type of secondary energy storage device. Compared with lithium-ion batteries currently used in the market, lithium-sulfur batteries have 2 to 5 times the theoretical energy density. However, limited by the mass ratio of binder, conductive agent and current ...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/62H01M10/052
CPCH01M4/134H01M4/1395H01M4/625H01M10/052Y02E60/10
Inventor 杨蓉樊潮江黄勇燕映霖冯祖飞余炜杨媛媛
Owner XIAN UNIV OF TECH
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