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A kind of preparation method of lithium ion battery composite material with double shell structure

A technology of lithium-ion batteries and composite materials, which is applied in the field of preparation of lithium-ion battery composite materials, can solve the problems of poor conductivity and poor conductivity, and achieve the effects of excellent discharge specific capacity and cycle stability

Active Publication Date: 2022-08-09
深圳中芯能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Metal-organic framework (MOF) is a new type of porous material with a network structure, which has been formed through coordination bonds with organic ligands. Among the existing energy raw materials, due to the large specific surface area of ​​metal-organic framework materials , good porosity, good thermal stability and ordered crystal structure are widely used in lithium battery electrode materials, but due to the poor conductivity of MOF, the electrode materials obtained from MOF materials have poor conductivity properties, which limits its application in electrode materials

Method used

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  • A kind of preparation method of lithium ion battery composite material with double shell structure
  • A kind of preparation method of lithium ion battery composite material with double shell structure
  • A kind of preparation method of lithium ion battery composite material with double shell structure

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Effect test

Embodiment 1

[0019] A preparation method of a lithium-ion battery composite material with a double-layer shell structure specifically comprises the following steps:

[0020] S1: adding cobalt nitrate hexahydrate into N,N-dimethylformamide, then ultrasonically dissolving to obtain solution I, then adding 2,5-dihydroxyterephthalic acid to anhydrous ethanol solution, ultrasonically dissolving it Dissolve to obtain solution II, mix and stir solutions I and II, add distilled water and then move to a polytetrafluoroethylene reactor, react at 110 ° C for 24 h, and cool to obtain metal organic framework Co-MOF-74, which is for later use; The mass ratio of hydrated cobalt nitrate and 2,5-dihydroxyterephthalic acid was 1.2:0.46; the volume ratio of N,N-dimethylformamide, absolute ethanol and distilled water was 15:10:1.5.

[0021] S2: adding copper nitrate trihydrate into methanol solution, adding the metal organic framework Co-MOF-74 in step S1 after ultrasonic dissolving, stirring magnetically for...

Embodiment 2

[0024] A preparation method of a lithium-ion battery composite material with a double-layer shell structure specifically comprises the following steps:

[0025] S1: adding cobalt nitrate hexahydrate into N,N-dimethylformamide, then ultrasonically dissolving to obtain solution I, then adding 2,5-dihydroxyterephthalic acid to anhydrous ethanol solution, ultrasonically dissolving it Dissolve to obtain solution II, mix and stir solutions I and II, add distilled water and then move to a polytetrafluoroethylene reaction kettle, react at 120 ° C for 30 h, and cool to obtain metal organic framework Co-MOF-74, which is for later use; The mass ratio of hydrated cobalt nitrate and 2,5-dihydroxyterephthalic acid was 2.8:0.85; the volume ratio of N,N-dimethylformamide, absolute ethanol and distilled water was 20:14:3.

[0026] S2: adding copper nitrate trihydrate into methanol solution, adding the metal organic framework Co-MOF-74 in step S1 after ultrasonic dissolving, stirring magnetical...

Embodiment 3

[0029] A preparation method of a lithium-ion battery composite material with a double-layer shell structure specifically comprises the following steps:

[0030] S1: adding cobalt nitrate hexahydrate into N,N-dimethylformamide, then ultrasonically dissolving to obtain solution I, then adding 2,5-dihydroxyterephthalic acid to anhydrous ethanol solution, ultrasonically dissolving it Dissolve to obtain solution II, mix and stir solutions I and II, add distilled water and then move to a polytetrafluoroethylene reactor, react at 115 ° C for 26 h, and cool to obtain metal organic framework Co-MOF-74, which is for later use; The mass ratio of hydrated cobalt nitrate and 2,5-dihydroxyterephthalic acid was 1.8:0.54; the volume ratio of N,N-dimethylformamide, absolute ethanol and distilled water was 16:12:1.9.

[0031] S2: adding copper nitrate trihydrate into methanol solution, adding the metal organic framework Co-MOF-74 in step S1 after ultrasonic dissolving, stirring magnetically for...

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Abstract

The invention discloses a preparation method of a lithium ion battery composite material with a double-shell structure, which comprises adding cobalt nitrate hexahydrate into N,N-dimethylformamide, and then dissolving by ultrasonic to obtain a solution I, and then adding 2,5-dihydroxyterephthalic acid was added to the absolute ethanol solution, and ultrasonically dissolved to obtain solution II. After the solutions I and II were mixed and stirred, distilled water was added and then moved to a polytetrafluoroethylene reaction kettle. React at ℃ for 24-30 h, and cool to obtain metal-organic framework Co-MOF-74, adding copper nitrate trihydrate to methanol solution, ultrasonically dissolving, adding metal-organic framework Co-MOF-74 in step S1, magnetically at room temperature Stir for 3 to 6 hours, then add citric acid to sonicate, move to a polytetrafluoroethylene reactor, react at 60 to 80 °C for 3 to 5 hours, cool, filter, and dry; place the dried product in a tube furnace, In an air atmosphere, the temperature is raised to 580-520°C at a heating rate of 5-8°C / min, maintained at this temperature for 4-7 hours, and then brought to room temperature at a rate of 0.5-1.2°C / min to obtain the composite material.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery composite materials, in particular to a preparation method of a lithium ion battery composite material with a double shell structure. Background technique [0002] Lithium-ion batteries will become the main power source for electric vehicles due to their high specific energy and long-lasting stability. Chemical energy storage technologies represented by lithium-ion batteries are also being actively invested in research and development. The current commercial lithium-ion battery negative electrode material is graphite carbon material, but its theoretical capacity is only 372mAh / g; + ), which is very close to the deposition potential of metallic lithium, which is not conducive to the safety of the battery. In order to meet the needs of high-capacity lithium-ion batteries, it is very urgent and necessary to research and develop lithium-ion battery electrode materials with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/60H01M10/0525
CPCH01M4/362H01M4/52H01M4/60H01M10/0525Y02E60/10
Inventor 廖江华
Owner 深圳中芯能科技有限公司
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