Method for preparing lithium ion battery antimony sulfide nanorod negative electrode

A lithium-ion battery and antimony sulfide technology, which is applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of high production cost and low specific capacity, and achieve the effects of short process, simple regulation and broadening industrial value

Active Publication Date: 2019-11-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low specific capacity and high preparation cost in the existing negative electrode of lithium ion battery, and propose a preparation method of antimony sulfide nanorod negative electrode of lithium ion battery

Method used

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  • Method for preparing lithium ion battery antimony sulfide nanorod negative electrode
  • Method for preparing lithium ion battery antimony sulfide nanorod negative electrode
  • Method for preparing lithium ion battery antimony sulfide nanorod negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh stibnite and mesoporous carbon according to the mass ratio of 1:1, add them to the ball mill tank, add ball mill beads according to the ball-to-material ratio of 10:1, and add alcohol according to the mass ratio of ball mill material to alcohol of 5:1, and use 450r / min for ball milling, the ball milling time is 4h. The resulting mixture was filtered, dried and ground. figure 1 A scanning electron microscope picture of the porous carbon used is shown, and it can be seen that the porous carbon has a pore size of about 150 nm and a pore wall thickness of 6 nm.

[0027] The ball mill mixture was placed in a heating furnace, argon gas was introduced, the temperature was raised to 600° C. at a rate of 5° C. / min, and the temperature was kept for 5 hours. After natural cooling, take it out to obtain a porous carbon-coated stibnite nanorod negative electrode, such as figure 2 shown. From figure 2 It can be seen that the diameter of the recombined stibnite nanorods i...

Embodiment 2

[0030] Weigh high-purity antimony sulfide and microporous carbon at a mass ratio of 85:15, add them to a ball mill tank, add ball milling beads at a ball-to-material ratio of 15:1, and perform ball milling at 600r / min in an air medium for 1 hour. The resulting mixture was filtered, dried and ground.

[0031] The ball mill mixture was placed in a heating furnace, argon gas was introduced, the temperature was raised to 600°C at a rate of 1°C / min, and the temperature was kept for 10 hours. After natural cooling, take it out to obtain a porous carbon-coated stibnite nanorod negative electrode.

Embodiment 3

[0033] Weigh the stibnite and macroporous carbon material according to the mass ratio of 20:80, add them to the ball milling tank, add ball milling beads according to the ball-to-material ratio of 20:1, and perform ball milling in an argon medium at 400r / min for 5 hours . The resulting mixture was filtered, dried and ground.

[0034] The ball mill mixture was placed in a heating furnace, and argon gas was introduced, and the temperature was raised to 650° C. at a rate of 10° C. / min, and kept for 5 hours. After natural cooling, take it out to obtain a porous carbon-coated stibnite nanorod negative electrode.

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Abstract

The invention discloses a method for preparing a lithium ion battery antimony sulfide nanorod negative electrode. The method includes the following steps: weighing a preset mass of antimony sulfide and porous carbon, adding the antimony sulfide and porous carbon to a ball milling tank, adding ball milling beads according to a preset mass ratio, ball milling the antimony sulfide and the porous carbon to obtain a mixture of the antimony sulfide and the porous carbon; melting and annealing the obtained mixture in an argon atmosphere to reorganize the antimony sulfide, cooling the product to obtain an antimony sulfide nanorod negative electrode material partially or completely coated with porous carbon. The method can directly use natural stibnite as an electrode active material, and melt-combines the natural stibnite with a porous carbon material to prepare the porous carbon-coated stibnite nanorod negative electrode. Using the method to prepare the negative electrode material has advantages of low cost, short process, simple control, no waste water, waste gas or waste residue, excellent performance, and is suitable for large-scale industrialization.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing an antimony sulfide nanorod negative electrode of a lithium ion battery. Background technique [0002] Lithium-ion battery is currently the most widely used secondary energy storage power source, which has many outstanding advantages. It has high energy density and power density, long cycle life, wide application range, safety and reliability. Electrode materials are an important part of lithium-ion batteries, including positive and negative electrodes. For the current commercialized lithium-ion batteries, graphite-based negative electrode materials account for more than 89% of the total negative electrode market, followed by amorphous carbon for 7%, and lithium titanate and silicon-carbon negative electrodes for about 2% (Nature Energy, 3, 2018 , 267-278). It can be seen that carbon materials are in an absolute dominant position in the ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M4/36H01M4/583H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘芳洋赖延清蒋良兴贾明李劼刘业翔汪齐徐向群
Owner CENT SOUTH UNIV
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