Lithium sulfur battery positive electrode material and preparation method thereof

A technology for lithium-sulfur batteries and cathode materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems affecting practical applications, achieve low cost, simple preparation process, and improve long-term cycle stability.

Active Publication Date: 2019-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polysulfide compounds produced by elemental sulfur during the electrochemical cycle are easily soluble in conventional electrolytes and detached from the positive electrode host material. After the discharge, the sulfur is converted into dilithium sulfide and the volume expands by 8 times, which seriously affects its practical application; therefore It is very necessary to develop cathode materials for lithium-sulfur batteries with better conductivity

Method used

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  • Lithium sulfur battery positive electrode material and preparation method thereof
  • Lithium sulfur battery positive electrode material and preparation method thereof
  • Lithium sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Take 0.16 g of cetyltrimethylammonium bromide and put it into 50ml of deionized water and fully stir for 0.6 hours to prepare the reaction mother liquor. Place the prepared reaction mother liquor in a thermostat at 80°C for 24 hours and then take out the reaction mother liquor. , And add ethyl orthosilicate to it, the ratio of the ethyl orthosilicate to mother liquor is: 0.3 g of reaction mother liquor is added per 1ml of ethyl orthosilicate, magnetically stirred at room temperature for 5 hours, and the reaction is sealed after After 24 hours, after the reaction is over, the resulting reactant is suction filtered, and washed alternately with absolute ethanol and deionized water for at least three times to a paste; the paste product is dispersed in 80ml of deionized water, and magnetically stirred for 2 hours; a nanometer is formed The silica mesoporous sphere dispersion liquid has a concentration of 0.1 mg / ml.

[0060] Weigh 0.4g of gelatin in 100ml of absolute ethanol, di...

Embodiment 2

[0064] Take 0.1 g of cetyltrimethylammonium bromide and put it into 50ml of deionized water and stir for 0.6 hours to prepare the reaction mother liquor. Place the prepared reaction mother liquor in a thermostat at 60°C for 48 hours; take out the reaction mother liquor, Ethyl orthosilicate was added to it. The ratio of the ethyl orthosilicate to the reaction mother liquor was 0.08g per 1ml of ethyl orthosilicate, stirred magnetically for 1 hour at room temperature, and reacted for 10 hours after sealing. After the reaction, the reactant is generated; the reactant is suction filtered, washed alternately with absolute ethanol and deionized water for at least three times until it becomes a paste; the paste product is dispersed in 50ml of deionized water and magnetically stirred for 2 hours; a nanometer is formed Silica mesoporous sphere dispersion; its concentration is 10mg / ml.

[0065] Weigh 0.4g glucose in 100ml absolute ethanol and pour it into the nano-silica mesoporous sphere d...

Embodiment 3

[0069] Take 0.25 g of cetyltrimethylammonium bromide into 50 ml of deionized water and stir for 0.6 hours to prepare the reaction mother liquor. The prepared reaction mother liquor is placed in a thermostat at 90°C for 30 hours; the reaction mother liquor is taken out, And add ethyl orthosilicate to it, the ratio of the ethyl orthosilicate to the reaction mother liquor is: 0.64 g of the reaction mother liquor is added per 1ml of ethyl orthosilicate, magnetically stirred at room temperature for 10 hours, and after sealing After reaction for 38 hours, reactants are formed after the reaction is completed; the reactants are suction filtered, washed alternately with absolute ethanol and deionized water for at least three times to a paste; the paste is dispersed into 150ml of deionized water, and magnetically stirred for 2 hours ; The formation of nano-silica mesoporous sphere dispersion. Its concentration is 8mg / ml.

[0070] Weigh 0.4 g of glucose in 100 ml of absolute ethanol and po...

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Abstract

The invention discloses a lithium sulfur battery positive electrode material, a preparation method of the material and an application of the material to the preparation of a lithium sulfur battery. The positive electrode material comprises four parts including nano silicon dioxide mesoporous spheres, a functional group-rich carbon coated layer, three-dimensional network reduced graphene oxide andsublimed sulfur. According to the preparation method, the nano silicon dioxide mesoporous spheres with different sizes are obtained in a self-assembly mode; the sublimed sulfur is fused into the nanosilicon dioxide mesoporous spheres to form a compound; and the compound and graphene oxide are reduced to prepare the lithium sulfur battery positive electrode material. The positive electrode material, a conductive agent and an adhesive are applied to a current collector according to a mass ratio, so that a high-performance lithium sulfur battery positive electrode is obtained; the high-performance lithium sulfur battery positive electrode is applied to the assembled lithium sulfur battery, so that the cycling stability, the rate performance and the coulombic efficiency of the battery can begreatly improved; the battery has the advantages of good charge-discharge performance, high load capacity, long cycle life and high specific capacity; and the requirements of battery markets on long-service-life and high-specific-capacity batteries are met.

Description

Technical field [0001] The invention relates to a battery cathode material, in particular to a cathode material for a lithium-sulfur battery and a preparation method thereof, and belongs to the field of battery anode materials. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode of the battery and metal lithium as the negative electrode. Sulfur as the positive electrode of lithium ion battery has a theoretical specific capacity of 1675mAh / g, which is an order of magnitude larger than the specific capacity of the current commercial lithium iron phosphate, lithium cobalt oxide, and nickel cobalt manganese lithium ion batteries. In addition, the rich source of elemental sulfur, low price and environmental friendliness make lithium-sulfur batteries have good commercial value. The theoretical specific capacity of metallic lithium has reached 3861mAh / g. The average discharge voltage of lithium-sulfur batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052C01B32/182
CPCY02E60/10
Inventor 朱基亮刘建鹏朱峻成
Owner SICHUAN UNIV
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