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A kind of preparation method of lithium-ion battery composite diaphragm

A technology for lithium-ion batteries and composite diaphragms, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of reducing the mechanical strength of the diaphragm, achieve improved safety performance and electrochemical performance, and high lithium ion conductivity. The effect of enhancing mechanical properties

Active Publication Date: 2021-09-03
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel electrolyte formed by polyvinylidene fluoride under the condition of being activated by the electrolyte greatly reduces the mechanical strength of the separator.

Method used

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  • A kind of preparation method of lithium-ion battery composite diaphragm

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Comparison scheme
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Embodiment 1

[0024] The preparation method of a kind of lithium-ion battery composite diaphragm that the present invention proposes comprises the following steps:

[0025] S1. Preparation of modified graphene: Weigh 10 mg graphene nanosheets and 100 mg 4-carboxybenzene diazonium salt at normal temperature, put them into 10 mL of 100 mmol / L hypophosphorous acid aqueous solution, stir well, and avoid Leave alone for 24 hours to carry out the modification reaction of graphene, filter and wash the obtained modified graphene aqueous solution, place in an oven and dry at 50°C for 5 hours to obtain modified graphene covalently modified by benzene carboxyl groups;

[0026] S2. Preparation of modified graphene dispersion: add the modified graphene in S1 to 100 mL of N-dimethylacetamide, and ultrasonically disperse for 30 minutes to obtain a modified graphene dispersion;

[0027] S3. Preparation of modified graphene / organic polymer: dissolve polyvinylidene fluoride in N-dimethylacetamide, add modifi...

Embodiment 2

[0030] The preparation method of a kind of lithium-ion battery composite diaphragm that the present invention proposes comprises the following steps:

[0031] S1. Preparation of modified graphene: Weigh 10 mg graphene nanosheets and 100 mg 4-carboxybenzene diazonium salt at normal temperature, put them into 10 mL of 100 mmol / L hypophosphorous acid aqueous solution, stir well, and avoid Leave alone for 24 hours to carry out the modification reaction of graphene, filter and wash the obtained modified graphene aqueous solution, place in an oven and dry at 50°C for 5 hours to obtain modified graphene covalently modified by benzene carboxyl groups;

[0032] S2. Preparation of the modified graphene dispersion: add the modified graphene to 100 mL of N-dimethylacetamide, and disperse it ultrasonically for 30 minutes to obtain the modified graphene dispersion;

[0033] S3. Preparation of modified graphene / organic polymer: dissolve polyvinylidene fluoride in N-dimethylacetamide, add mod...

Embodiment 3

[0036] The preparation method of a kind of lithium-ion battery composite diaphragm that the present invention proposes comprises the following steps:

[0037] S1. Preparation of modified graphene: Weigh 10 mg graphene nanosheets and 100 mg 4-carboxybenzene diazonium salt at normal temperature, put them into 10 mL of 100 mmol / L hypophosphorous acid aqueous solution, stir well, and avoid Leave alone for 24 hours to carry out the modification reaction of graphene, filter and wash the obtained modified graphene aqueous solution, place in an oven and dry at 60°C for 5 hours to obtain modified graphene covalently modified by benzene carboxyl groups;

[0038] S2. Preparation of the modified graphene dispersion: add the modified graphene to 100 mL of N-dimethylacetamide, and disperse it ultrasonically for 50 minutes to obtain the modified graphene dispersion;

[0039] S3. Preparation of modified graphene / organic polymer: dissolve polyvinylidene fluoride in N-dimethylacetamide, add mod...

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Abstract

The invention discloses a preparation method of a lithium-ion battery composite diaphragm, relates to the technical field of lithium-ion batteries, and comprises the following steps: preparation of modified graphene, preparation of modified graphene dispersion, preparation of modified graphene / organic polymer, Diaphragm preparation. The present invention precipitates modified graphene / organic polymer on the surface of polyolefin diaphragm, and the prepared composite diaphragm has the chemical stability, electrochemical stability, thermodynamic stability, flexibility and high porosity of organic polymer modified diaphragm The benzene carboxyl group modified on graphene can interact with lithium ions in the electrolyte to increase the desolvation degree of lithium ions to improve the conduction rate of lithium ions. The carboxyl group can also improve the wettability of the base film to the electrolyte, and the prepared lithium-ion composite diaphragm improves the safety performance and electrochemical performance of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium ion battery composite diaphragm. Background technique [0002] In lithium-ion batteries, the separator is a very important component. Its main function is to physically separate the positive and negative electrodes and prevent the passage of electrons so as not to cause a short circuit, while allowing the conduction of lithium ions. The performance of the separator directly determines the internal resistance of the battery, the adsorption of the electrolyte, the conduction of lithium ions, etc., which greatly affects the electrochemical performance and safety performance of the battery. Nowadays, polyolefin materials such as polyethylene (PE) and polypropylene (PP) occupy a dominant position in the separator market due to their excellent mechanical properties, chemical stability and low cost. However, the thermal stability of this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/446H01M50/491H01M50/451H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 李智柳盼盼刘俊杰魏锴代北北
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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