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Composite lithium ion battery separator and preparation method thereof

A lithium-ion battery, composite technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as limited space occupation and performance impact of lithium-ion batteries, avoiding short circuits, increasing costs, and simple steps. Effect

Inactive Publication Date: 2019-07-23
SHANGHAI NANOTECH PROMOTION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of the diaphragm in the battery takes up the limited space inside the battery, which will have an adverse effect on the performance of the lithium-ion battery.

Method used

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  • Composite lithium ion battery separator and preparation method thereof
  • Composite lithium ion battery separator and preparation method thereof
  • Composite lithium ion battery separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Coating preparation: Add inorganic water-based dispersion liquid, organic water-based dispersion liquid and surfactant into deionized water and stir for 3 hours and mix uniformly to obtain coating; wherein, inorganic water-based dispersion liquid is water-based nano SiO with 50% solid content 2 Dispersion liquid; The organic water-based dispersion liquid is polyvinylidene fluoride (PVDF) dispersion liquid of 50% solid content; Surfactant is nonionic polyacrylamide; Wherein, the add-on of inorganic water-based dispersion liquid is 56wt%, organic water-based dispersion liquid The addition amount of the surfactant is 1wt%, the addition amount of the surfactant is 0.7wt%, and the addition amount of the deionized water is 42.3wt%. The particle diameter of the inorganic particles in the inorganic aqueous dispersion is 90-105nm; the particle diameter of the organic particles in the organic aqueous dispersion is 350-450nm.

[0031] (2) Pass the clean 12μm pure PE diaphragm ...

Embodiment 2

[0036] The preparation steps of embodiment 2 are basically the same as embodiment 1, and the only difference is that the water-based binder is acrylic acid ester (AE).

[0037] The composite lithium-ion battery diaphragm prepared by the above method is composed of a substrate layer and an inorganic / organic composite porous film layer arranged on the surface of the substrate layer, the substrate layer is a PE film; the inorganic / organic composite porous film layer is composed of inorganic SiO 2 The composite layer of nanoparticles and acrylate (AE), the thickness of the inorganic / organic composite porous film layer on one side of the substrate layer is about 3um.

Embodiment 3

[0039] The preparation steps of embodiment 3 are substantially the same as embodiment 1, and the only difference is that the water-based binder is polyurethane (PU).

[0040] The composite lithium-ion battery diaphragm prepared by the above method is composed of a substrate layer and an inorganic / organic composite porous film layer arranged on the surface of the substrate layer, the substrate layer is a PE film; the inorganic / organic composite porous film layer is composed of inorganic SiO 2 The composite layer of nanoparticles and polyurethane (PU), the thickness of the inorganic / organic composite porous film layer on one side of the substrate layer is about 3um.

[0041] Function detection:

[0042] (1) Test method:

[0043] a) air permeability

[0044] Air permeability is one of the important parameters to characterize the pore structure of lithium-ion battery separator, usually expressed by Gurley value, the unit is second (s). Its physical meaning is the time required...

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Abstract

The present invention relates to a composite lithium ion battery separator and a preparation method thereof. The composite lithium ion battery separator is composed of a substrate layer and an inorganic / organic composite porous film layer arranged on the surface of the substrate layer. The substrate layer is polyolefin porous film and the inorganic / organic composite porous film layer is a composite layer containing inorganic nanoparticles and waterborne binder. The preparation method of the composite lithium ion battery separator is as follows: inorganic waterborne dispersion liquid, organic waterborne dispersion liquid and surfactant are added into deionized water, stirred and mixed uniformly to prepare coating; the substrate layer is immersed into the prepared coating, subjected to dip coating, dried at a room temperature and then dried in vacuum to prepare the composite lithium ion battery separator. The invention aims at the problem that the safety performance of the separator is unstable; an organic-inorganic uniform hybrid porous film is cured and formed on the surface of the separator; and the improvement of the separator thermostability and the safety and the chemical corrosion resistance of the lithium ion battery is realized.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery separators, in particular to a composite lithium-ion battery separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries are considered ideal for high-capacity, high-power batteries. In order to meet the ever-growing application requirements, lithium-ion batteries should have good cycle stability, high reversible capacity, fast charge and discharge and other electrochemical properties. With the large-scale application of lithium-ion batteries, their safety issues have become increasingly prominent. [0003] The separator is a key part of the lithium-ion battery, between the positive and negative electrodes of the battery, avoiding physical contact between the two electrodes while maintaining the transmission of free ions. The separator is mainly composed of polymer film or non-woven film, and has a rich pore structure. The separator needs to have sufficient ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/446H01M50/449
CPCH01M10/0525H01M50/403H01M50/431H01M50/411Y02E60/10
Inventor 巴超群闵国全刘彦伯宋志棠周伟民张静李萍
Owner SHANGHAI NANOTECH PROMOTION CENT
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