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Carbon-coated mesoporous transition metal sulfide negative electrode material as well as preparation method and application thereof

A carbon-coated mesoporous and transition metal technology, which can be used in battery electrodes, electrochemical generators, electrical components, etc., and can solve the problems of poor discharge specific capacity and rate performance.

Inactive Publication Date: 2021-05-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, one of the objectives of the present invention is to solve the technical problem of poor discharge specific capacity and rate performance due to the volume expansion of transition metal sulfides, and provide a mesoporous structure and an amorphous carbon coating that cooperates with each other to ensure that it has Carbon-coated mesoporous transition metal sulfide anode materials with high structure and electrochemical stability

Method used

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  • Carbon-coated mesoporous transition metal sulfide negative electrode material as well as preparation method and application thereof
  • Carbon-coated mesoporous transition metal sulfide negative electrode material as well as preparation method and application thereof
  • Carbon-coated mesoporous transition metal sulfide negative electrode material as well as preparation method and application thereof

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preparation example Construction

[0019] One aspect of the present invention provides a method for preparing a carbon-coated mesoporous transition metal sulfide negative electrode material. In an exemplary embodiment of the method for preparing a carbon-coated mesoporous transition metal sulfide negative electrode material, it may include:

[0020] S01, mix polyvinylpyrrolidone, transition metal salt solution and sulfur source and heat until the reaction is complete to obtain a solution containing transition metal sulfide.

[0021] S02, uniformly mixing the transition metal sulfide-containing solution with a carbon source and then reacting to obtain coke-coated transition metal sulfide.

[0022] S03, the coke-coated transition metal sulfide is centrifuged, washed, and dried to obtain solid transition metal sulfide powder.

[0023] S04, calcining the solid transition metal sulfide powder under an inert atmosphere to obtain a carbon-coated mesoporous transition metal sulfide negative electrode material.

[0024...

example 1

[0047] Step 1: Measure 40mL of ethylene glycol solution and disperse it in 40mL of deionized water, and stir until uniform to form a uniformly mixed ethylene glycol solution.

[0048] Step 2: Slowly add 0.6g of polyvinylpyrrolidone to the ethylene glycol solution obtained in step 1, and magnetically stir until completely dissolved; then slowly add 2mmol of nickel acetate tetrahydrate (C 4 h 6 o 4 Ni·4H 2 O) powder, stirred magnetically until completely dissolved; then added 6 mmol of Na 2 S 2 o 3 ·5H 2 O, stir magnetically until completely dissolved. Then the obtained solution was placed in a high-pressure reactor, heated in an oven at 180° C. for 10 h for hydrothermal reaction, and a solution containing NiS was formed.

[0049] Step 3: Disperse 1.5g of glucose in the NiS-containing solution obtained above, stir until uniform, form a uniform mixed solution, put it in a high-pressure reactor, heat it in an oven at 180°C for 10 hours for hydrothermal reaction, and obtain ...

example 2

[0057] Step 1: Measure 35 mL of ethylene glycol solution and disperse it in 45 mL of deionized water, stir until uniform to form a uniformly mixed ethylene glycol solution.

[0058] Step 2: Slowly add 0.5 g of polyvinylpyrrolidone to the ethylene glycol solution obtained in Step 1, and magnetically stir until completely dissolved; slowly add 1.5 g of cobalt chloride, magnetically stir until completely dissolved, and then add 0.9 g of thiourea, Stir magnetically until complete dissolution. Then the obtained solution was placed in an autoclave, and heated in an oven at 230 °C for 20 h for hydrothermal reaction to form a CoS-containing solution.

[0059] Step 3: Disperse 2.5 g of sucrose in the above CoS-containing solution, stir until uniform, form a uniform mixed solution, place it in a high-pressure reactor, and heat it in an oven at 240° C. for 24 hours for hydrothermal reaction.

[0060] Step 4: Centrifuge the solution obtained in step 3 to obtain the product, wash it, and ...

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Abstract

The invention provides a carbon-coated mesoporous transition metal sulfide negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps of: mixing polyvinylpyrrolidone, a transition metal salt solution and a sulfur source, and performing heating until the reaction is finished to obtain a transition metal sulfide-containing solution; uniformly mixing the transition metal sulfide-containing solution with a carbon source, and performing a reaction to obtain a coke-coated transition metal sulfide; centrifuging the coke-coated transition metal sulfide, preforming cleaning, and drying to obtain solid transition metal sulfide powder; and calcining the solid transition metal sulfide powder in an inert atmosphere to obtain the carbon-coated mesoporous transition metal sulfide negative electrode material. The negative electrode material is formed by stacking a plurality of nanoscale primary particles, each primary particle is composed of an inner transition metal sulfide and an amorphous carbon coating layer coating the surface of the transition metal sulfide, and a mesoporous structure is formed among the primary particles. The material has high structural stability; and the preparation method is simple.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a carbon-coated mesoporous transition metal sulfide negative electrode material and a preparation method and application thereof. Background technique [0002] Energy storage devices such as lithium-ion and sodium-ion batteries have excellent characteristics such as no pollution, high specific energy, high working voltage, long cycle life and no memory effect, and have been widely used in various energy fields such as portable devices and mobile power supplies. At present, the negative electrode materials of lithium-ion and sodium-ion batteries widely used in commercialization mainly include graphite and lithium titanate, etc., but the theoretical specific capacity of traditional negative electrode materials is relatively low, which cannot meet the needs of high-capacity, high-power, and long-life secondary batteries. Battery development needs. [0003] Based on the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525H01M10/054
CPCH01M4/366H01M4/5815H01M4/583H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 王丁李雪豹夏广辉张英杰段建国何晶晶黄杰盟刘露之
Owner KUNMING UNIV OF SCI & TECH
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