Secondary battery composite membrane, preparation method thereof and secondary battery

A composite diaphragm and secondary battery technology, which is applied in secondary battery manufacturing, secondary batteries, battery pack components, etc., can solve the problems of inability to intercept falling off electrode materials, inability to improve battery cycle performance, etc., to prevent capacity decline, Stable structure and good electrical conductivity

Inactive Publication Date: 2015-08-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a secondary battery composite diaphragm and its preparation method, aiming at solving the problem that the existing secondary battery diaphragm cannot intercept the fallen electrode material and make it continue to realize charging and discharging, and cannot Technical Problems in Improving Battery Cycle Performance

Method used

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  • Secondary battery composite membrane, preparation method thereof and secondary battery
  • Secondary battery composite membrane, preparation method thereof and secondary battery
  • Secondary battery composite membrane, preparation method thereof and secondary battery

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preparation example Construction

[0036] Correspondingly, the embodiment of the present invention also provides a preparation method of the secondary battery composite separator described above. For the process flow of the preparation method of the secondary battery composite diaphragm, please refer to figure 2 , see also the figure 1 , which includes the following steps:

[0037] Step S01. Prepare a dispersion or slurry containing a conductive material:

[0038] Dispersing conductive materials and surfactants into liquid solvents to prepare conductive material dispersions, or adding conductive materials and binders to solvents to prepare conductive material slurries;

[0039] Step S02. Apply the dispersion or slurry containing the conductive material to the conductive layer on the surface of the electrically insulating substrate:

[0040] The conductive material dispersion prepared in step S01 is formed on the surface of the electrical insulating substrate 1 to form a conductive layer 2 to form a first co...

Embodiment 1

[0065] A composite diaphragm for a secondary battery and a preparation method thereof. The structure of the secondary battery composite separator is as follows figure 1 shown. It comprises an electrically insulating matrix layer 1 and a conductive layer 2 combined on the surface of the electrically insulating matrix layer 1 . Wherein, the material of the electrically insulating matrix layer 1 is Celgard 2400 lithium-ion battery polymer diaphragm; the thickness of the conductive layer 2 is 20 μm, which includes carbon nanotubes as the conductive material.

[0066] The preparation method of the secondary battery composite diaphragm is as follows:

[0067] S11. Conductive material and povidone are added in dehydrated alcohol according to the ratio of mass ratio 5:1, carry out sufficient dispersion, be mixed with uniform conductive material dispersion liquid;

[0068] S12. The conductive material dispersion prepared in step S11 is filtered to flow through the electrical insulat...

Embodiment 2

[0072] A composite diaphragm for a secondary battery and a preparation method thereof. The structure of the secondary battery composite separator is as follows figure 1 shown. It comprises an electrically insulating matrix layer 1 and a conductive layer 2 combined on the surface of the electrically insulating matrix layer 1 . Wherein, the material of the electrically insulating matrix layer 1 is selected from Celgard 2400 polymer diaphragm; the thickness of the conductive layer 2 is 30 μm, which includes graphene as the conductive material and polyvinylidene fluoride as the binder, and the conductive material and the binder The mass ratio is 4:1.

[0073] The preparation method of the secondary battery composite diaphragm is as follows:

[0074] S21. Add the conductive material and the binder into the nitrogen methyl pyrrolidone according to the mass ratio of 4:1, carry out sufficient mixing treatment, and prepare a uniform conductive material slurry;

[0075] S22. Coating...

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Abstract

The invention provides a secondary battery composite membrane, a preparation method thereof and a secondary battery. The secondary battery composite membrane comprises an electric-insulated substrate layer and a conducting layer which is bonded to the surface of the electric-insulated substrate layer, and the conducting layer comprises conducting material, and the thickness of the conducting layer is 5 to 50 microns. The preparation method of the secondary battery composite membrane comprises the steps as follows: preparing dispersion liquid or slurry with conducting material, forming the conducting layer on the surface of the electric-insulated substrate layer by using the dispersion liquid or slurry with conducting material, drying and shaping the composite membrane, pressing the dried and shaped composite membrane. The membrane of the secondary battery uses the secondary battery composite membrane of the invention. The secondary battery composite membrane of the invention can be used for effectively preventing electrode material from falling off from a current collector so that the current collector can be used for charging and discharging continuously. The preparation method of the invention is high in production efficiency and can be applied in industrial production. The cycle life of the secondary battery is long.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a secondary battery composite diaphragm, a preparation method thereof, and a secondary battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high open circuit voltage, high specific capacity, and no memory effect. They are widely used in digital electronic products such as mobile phones, digital cameras, and notebook computers, and are gradually being applied to electric vehicles. , Smart grid and other large and medium-sized equipment. With the continuous expansion of the application range of lithium-ion secondary batteries, more and more attention has been paid to its safety performance and cycle life. [0003] Lithium-ion secondary batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, separators, casings and other parts. Among them, separator and electrode materials are one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/00H01M50/403H01M50/449H01M50/491
CPCH01M10/04H01M10/0525H01M50/44H01M50/431H01M50/40H01M50/409H01M50/403Y02E60/10
Inventor 唐永炳张小龙王婷
Owner SHENZHEN INST OF ADVANCED TECH
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