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Inorganic/organic composite membrane, its preparation method and lithium ion secondary battery containing the membrane

An inorganic composite and separator technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of small compactness, small surface roughness, insufficient bulk density of separators, poor heat resistance of separators, etc., to improve safety and stability. , The effect of preventing fire accidents and reducing the resistance of transmission

Active Publication Date: 2017-02-08
东莞市魔方新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first aspect of the task of the present invention is at least one surface of the porous substrate by coating at least two kinds of porous insulating layers composed of inorganic particles and binders with different average particle sizes in a gradient change, to provide a kind of porous insulating layer with good compactness. , small surface roughness, high puncture strength and ultra-low thermal shrinkage organic / inorganic composite diaphragm to solve the problem of poor heat resistance of the diaphragm caused by insufficient bulk density of the diaphragm

Method used

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  • Inorganic/organic composite membrane, its preparation method and lithium ion secondary battery containing the membrane
  • Inorganic/organic composite membrane, its preparation method and lithium ion secondary battery containing the membrane
  • Inorganic/organic composite membrane, its preparation method and lithium ion secondary battery containing the membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation methods of the positive electrode sheet, the negative electrode sheet and the lithium-ion secondary battery are all the same as in Comparative Example 1.

[0051] Such as figure 1 As shown, the porous substrate g1 of the organic / inorganic composite membrane is coated with a porous insulating layer g2, and the inorganic particles in the porous insulating layer g2 include the first type of inorganic particles g21 and the second type of inorganic particles g22 with two different particle sizes , the binder is mixed with the inorganic particles and adheres to the surface of the inorganic particles, which is not shown in the figure.

[0052] Preparation of diaphragm:

[0053] (1) Preparation of porous insulating layer g2

[0054] First add 15wt% polyacrylate emulsion (40% in aqueous solution) into deionized water and stir for 1 hour, then add 40% of the first Al 2 o 3 Particles (average particle size 0.3μm, particle size distribution 0.05~2.0μm) and 45wt%...

Embodiment 2

[0058] The preparation methods of the positive electrode sheet, the negative electrode sheet and the lithium-ion secondary battery are all the same as in Comparative Example 1.

[0059] Preparation of diaphragm:

[0060] (1) Preparation of porous insulating layer g2

[0061] First add 15wt% polyacrylate emulsion (40% in aqueous solution) into deionized water and stir for 1 hour, then add 25% of the first Al 2 o 3 Inorganic particles (the average particle size is 0.3μm, the particle size distribution range is 0.08~2μm), 30% of the second Al 2 o 3 Inorganic particles (average particle size 0.6μm, particle size distribution range 0.1~3.0μm) and 30wt% third Al 2 o 3 The particles (with an average particle size of 1.0 μm and a particle size distribution range of 0.1-4.5 μm) were stirred for 2 hours, and then ground in a ball mill for 1 hour to prepare a slurry with a solid content of 40%.

[0062] (2) Coating a porous insulating layer g2 on the surface of the porous substrate...

Embodiment 3

[0065] (1) Preparation of porous insulating layer g2

[0066] Add 3wt% polyvinylidene fluoride to N-methylpyrrolidone and stir at 45°C for 1 h, then add 40% of the first TiO 2 Particles (with an average particle size of 0.25 μm and a particle size distribution range of 0.08 to 1.8 μm), 30% of the second TiO 2 Particles (average particle size 0.7μm, particle size distribution range 0.1~3.5μm) and 27wt% TiO 3 2 The particles (with an average particle size of 1.2 μm and a particle size distribution range of 0.1-5 μm) were stirred for 2 hours and then ground in a ball mill for 1 hour to prepare a slurry with a solid content of 65%.

[0067] (2) Coating a porous insulating layer g2 on the surface of the porous substrate g1

[0068] Take a polypropylene microporous film with a thickness of 12 μm as the porous substrate g1, and then use gravure coating to uniformly cover the prepared slurry on one surface of the porous substrate g1 with a coating thickness of 2 μm, and then strip t...

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Abstract

The invention discloses an organic / inorganic composite separator, which includes a porous base and a porous insulating layer attached to the porous base. The porous insulating layer is coated on at least one surface of the porous base. The porous insulating layer includes inorganic particles and a binder. , the inorganic particles are composed of n kinds of particles with different average particle sizes, n≥2, and a gradient change is formed between the average particle sizes of the first type of inorganic particles to the nth type of inorganic particles; its preparation method is also disclosed. First, the binder is Dissolve in a solvent to form a polymer solution, add inorganic particles and stir to prepare a porous insulating layer, and then coat at least one surface of the porous substrate with the porous insulating layer; a lithium ion secondary battery including the separator is also disclosed; the organic / The inorganic composite separator has a high packing density, low thermal shrinkage, high puncture strength, simple preparation process and moderate cost. The lithium-ion secondary battery containing the separator has good cycle capacity retention and excellent safety performance and electrochemistry. performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to an inorganic / organic composite membrane, a preparation method thereof and a lithium-ion secondary battery containing the membrane. Background technique [0002] Due to the characteristics of high energy density, high working voltage and light weight, lithium-ion secondary batteries have been widely used in consumer electronics products, such as mobile phones, notebook computers, tablet computers, Bluetooth headsets, MP3 and digital cameras. With the increasingly severe environmental pollution and energy crisis, the use of lithium-ion secondary batteries in power batteries and stationary power stations has become more and more popular, but the safety of lithium-ion secondary batteries has always been the focus of attention. [0003] The diaphragm of the lithium-ion secondary battery is used as the isolation of the positive and negative electrodes. It must h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/446
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 蒋中林
Owner 东莞市魔方新能源科技有限公司
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