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Negative electrode material for secondary battery, preparation method of negative electrode material, negative electrode plate and secondary battery

A technology for secondary batteries and negative electrode materials, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of small interlayer spacing, inability to achieve alkali metal de-intercalation, etc., to promote transfer and improve kinetics performance effect

Active Publication Date: 2022-04-12
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a negative electrode material for secondary batteries to solve the problem that the current graphite negative electrode material has a small layer spacing and cannot achieve alkali metal deintercalation with a large ionic radius

Method used

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  • Negative electrode material for secondary battery, preparation method of negative electrode material, negative electrode plate and secondary battery
  • Negative electrode material for secondary battery, preparation method of negative electrode material, negative electrode plate and secondary battery
  • Negative electrode material for secondary battery, preparation method of negative electrode material, negative electrode plate and secondary battery

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preparation example Construction

[0035] The second aspect of the present invention aims to provide a method for preparing the negative electrode material for secondary batteries, comprising the following steps:

[0036] S1. Mix the aqueous solution of metal ion salt and surfactant to obtain solution A, and the aqueous solution of 2-methylimidazole as solution B. Pour solution A into solution B and stir, centrifuge and wash until colorless, and dry in vacuum to obtain nano A precursor of a cubic skeleton; then calcining the precursor of the nanocube skeleton at 300-650° C., and cooling to obtain a nanocube skeleton;

[0037] S2. Using a hydrothermal method to grow vanadium disulfide on the surface of the nanocube skeleton to obtain a negative electrode material for a secondary battery.

[0038] The present invention uses the zeolite imidazole metal-organic framework as a precursor to prepare a metal oxide and carbon-doped nano-cube skeleton with a stable structure, and vertically anchors the layered VS on the ...

Embodiment 1

[0052] A negative electrode material for a secondary battery, comprising a nanocube framework and layered vanadium disulfide vertically anchored and grown on the surface of the nanocube framework; the precursor of the nanocube framework is a zeolite imidazole metal organic framework. Wherein, the zeolite imidazole metal organic framework is a zeolite imidazole framework structure (ZIF-67) with cobalt as the metal ion. Can be like Figure 1~2 shown.

[0053] The preparation method of this negative electrode material comprises the following steps:

[0054] S1, 0.58g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 20mL of pure water, add 10mg of cetyltrimethylammonium bromide, ultrasonically mix to obtain a clear and transparent solution A, completely dissolve 9.08g of 2-methylimidazole in 140mL of pure water as a solution B. Quickly pour solution A into solution B and stir for 20 minutes, then collect the product by centrifugation and wash repeatedly with ethan...

Embodiment 2

[0058] The difference from Embodiment 1 is step S2.

[0059] S2. Then place the ZIF-67 cube in a tube furnace, heat it to 600°C for 3h in the air at a heating rate of 2°C / min, and then cool it to room temperature to obtain Co 3 o 4 / C Nanocube.

[0060] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides a negative electrode material for a secondary battery, a preparation method of the negative electrode material, a negative electrode plate and the secondary battery. The negative electrode material comprises a nanocube framework and layered vanadium disulfide growing on the surface of the nanocube framework, a precursor of the nanocube framework is a zeolite imidazole metal organic framework. Compared with the prior art, the negative electrode material provided by the invention adopts the nanocube as a supporting framework and the zeolite imidazole metal organic framework as a precursor, so that the negative electrode material has relatively good stability in structure and can provide stable support for an overall layered three-dimensional structure; lamellar vanadium disulfide is grown on the surface of the nanocube framework, the lamellar vanadium disulfide is formed by S-V-S connection, the interlayer distance is large, electrons can be transmitted in a planar network formed by V-V bonds, and the electron transfer efficiency is improved. And the problem that the deintercalation of alkali metal with larger ion radius cannot be realized due to smaller interlayer spacing of the existing graphite negative electrode material can be effectively solved.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a negative electrode material for a secondary battery, a preparation method thereof, a negative electrode sheet and a secondary battery. Background technique [0002] Lithium-ion batteries are the most widely used secondary batteries at present, but with the development of technology and the surge in market demand, the price of lithium metal has increased year by year. Therefore, in recent years, more and more researches have been done on the development and research of other alkali metal ion batteries, such as sodium ion batteries with Prussian white as the positive electrode and hard carbon as the negative electrode. [0003] For the negative terminal of lithium-ion batteries, layered graphite has always been used as the main material, but for alkali metals with large ionic radii such as sodium ions and potassium ions, effective reversible deintercalation cannot be achieved d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M4/13H01M4/136H01M10/0525
CPCY02E60/10
Inventor 蔡泽林陈杰杨山
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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