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Self-supporting binary metal sulfide composite material and preparation method thereof, lithium ion battery negative electrode and lithium ion battery

A lithium-ion battery and binary metal technology, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of limiting the capacity of lithium-ion batteries, powdering of negative electrode materials, poor conductivity, etc., and improve electrochemical performance , good growth and compactness, and the effect of enhancing electrical conductivity

Active Publication Date: 2019-12-17
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the theoretical capacity of traditional lithium-ion battery anode material graphite is only 372mAh / g, which greatly limits the capacity of lithium-ion batteries, and there is an urgent need to find lithium-ion battery anode materials with higher capacity.
[0004] Lithium-ion battery anode materials such as silicon and metal oxides have high theoretical capacity, but generally have poor conductivity, and the volume expansion during the cycle is serious, resulting in powdering of the anode material and a sharp decline in capacity.

Method used

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  • Self-supporting binary metal sulfide composite material and preparation method thereof, lithium ion battery negative electrode and lithium ion battery
  • Self-supporting binary metal sulfide composite material and preparation method thereof, lithium ion battery negative electrode and lithium ion battery
  • Self-supporting binary metal sulfide composite material and preparation method thereof, lithium ion battery negative electrode and lithium ion battery

Examples

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Embodiment 1

[0044] A method for preparing a self-supporting binary metal sulfide composite material, comprising the following steps:

[0045] A, solution reaction procedure: 0.1725g zinc sulfate heptahydrate, 0.1577g nickel sulfate hexahydrate, 0.5821g cobalt nitrate hexahydrate are dissolved in 40ml deionized water, stir 30min, obtain the solution containing zinc salt, nickel salt and cobalt salt, 1 g of 2-methylimidazole was dissolved in 40 ml of deionized water, and stirred for 30 minutes to obtain a 2-methylimidazole solution, and the two solutions were mixed and stirred at room temperature for 5 minutes to obtain a mixed solution.

[0046] B. Composite process: Cleaning of carbon cloth: Cut the carbon cloth into small pieces of 1cm×1cm, put them into a 50ml beaker, and ultrasonically clean them with acetone, ethanol and deionized water for 15 minutes respectively. Put the cleaned carbon cloth into the mixed solution in step A, let it stand at room temperature for 4h, then take out th...

Embodiment 2

[0049] A method for preparing a self-supporting binary metal sulfide composite material, comprising the following steps:

[0050] A, solution reaction procedure: 0.1785g zinc nitrate hexahydrate, 0.1745g nickel nitrate hexahydrate, 0.6748g cobalt sulfate heptahydrate are dissolved in 40ml deionized water, stir 30min, obtain the solution containing zinc salt, nickel salt and cobalt salt, Dissolve 1.2 g of 2-methylimidazole in 40 ml of deionized water and stir for 30 minutes to obtain a 2-methylimidazole solution. Mix and stir the two solutions at room temperature for 5 minutes to obtain a mixed solution.

[0051] B. Composite process: the cleaning of the carbon cloth is the same as in Example 1. Put the cleaned carbon cloth into the mixed solution in step A, let it stand at room temperature for 8h, then take out the carbon cloth with material, rinse it with deionized water three times, and dry it at 60°C for 12h to obtain Zn / Ni / Co-ZIF / carbon cloth composite.

[0052] C, hydr...

Embodiment 3

[0054] A method for preparing a self-supporting binary metal sulfide composite material, comprising the following steps:

[0055] A, solution reaction process: 0.2876g zinc sulfate heptahydrate, 0.2629g nickel sulfate hexahydrate, 1.1641g cobalt nitrate hexahydrate were dissolved in 40ml deionized water, stirred for 30min, to obtain a solution containing zinc salt, nickel salt and cobalt salt, Dissolve 1.4 g of 2-methylimidazole in 40 ml of deionized water and stir for 30 minutes to obtain a 2-methylimidazole solution. Mix and stir the two solutions at room temperature for 5 minutes to obtain a mixed solution.

[0056] B. Composite process: the cleaning of the carbon cloth is the same as in Example 1. Put the cleaned carbon cloth into the mixed solution in step A, let it stand at room temperature for 5h, then take out the carbon cloth with material, rinse it with deionized water three times, and dry it at 60°C for 12h to obtain Zn / Ni / Co-ZIF / carbon cloth composite.

[0057] ...

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Abstract

The invention provides a self-supporting binary metal sulfide composite material and a preparation method thereof, a lithium ion battery negative electrode and a lithium ion battery. Compared with themethods in the prior art, Zn / Ni / Co-ZIF material is grown on a carbon cloth through ion exchange at room temperature and then vulcanized under the hydrothermal condition so as to obtain a self-supporting ZnCo2S4 @ NiCo2S4 / carbon cloth composite material. The ZnCo2S4 @ NiCo2S4 array grown uniformly on the carbon cloth fiber provides a large number of redox sites, the migration path of lithium ionsis shortened, and the transition metal sulfide has excellent electrical conductivity and can quickly transmit electrons. The material is applied to the negative electrode material of the lithium ion battery and has the advantages of good cycle stability, high energy density and the like. In addition, the preparation method of the composite material is simple, the conditions are mild and easy to obtain, the requirements for instruments and equipment are low and mass production can be carried out.

Description

technical field [0001] The invention relates to the technical field of inorganic nanometer materials, in particular to a self-supporting binary metal sulfide composite material and a preparation method thereof, a negative electrode of a lithium ion battery, and a lithium ion battery. Background technique [0002] With the development of society, especially the rise of new energy technologies, people have put forward higher requirements for energy storage materials. Lithium-ion batteries have the advantages of high energy density, long cycle life, and wide operating temperature range, and have been widely used. . [0003] However, the theoretical capacity of traditional lithium-ion battery anode material graphite is only 372mAh / g, which greatly limits the capacity of lithium-ion batteries, and there is an urgent need to find lithium-ion battery anode materials with higher capacity. [0004] Lithium-ion battery anode materials such as silicon and metal oxides have a high theo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M4/136H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘金云张海阔林夕蓉韩阗俐梅本星李金金
Owner ANHUI NORMAL UNIV
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