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Lithium ion battery

A lithium-ion battery, polymer technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problem of battery short circuit, separator and pole piece dislocation, ceramic layer and pole piece cannot form adhesion And other issues

Inactive Publication Date: 2012-07-11
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this diaphragm can indeed greatly improve its thermal stability, but the adhesion between the ceramic layer and the pole piece cannot be formed. short circuit inside the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pole piece preparation:

[0034] Preparation of positive electrode sheet:

[0035] The positive electrode active material, the binder and the conductive material are mixed in the solvent according to the proportion, and after uniform stirring, the positive electrode slurry is obtained. Coating the positive electrode slurry on the positive electrode current collector 1, drying, and cold pressing to obtain the positive electrode active material layer 2, and then cutting into pieces and welding tabs to obtain the positive electrode sheet to be processed.

[0036] Polyacrylonitrile (PAN) is formulated into a solution, then coated on the surface of the positive electrode active material layer 2 by printing and coating, and dried to obtain a positive electrode polymer bonded with a thickness of 0.1 μm and a porosity of 30%. Layer 3.

[0037] Preparation of negative electrode sheet:

[0038]The negative electrode active material, the binder and the conductive material are m...

Embodiment 2

[0046] The difference with embodiment 1 is:

[0047] The positive polymer adhesive layer 3 is a polyoxyethylene (PEO) layer with a thickness of 0.5 μm and a porosity of 40%.

[0048] The negative electrode polymer bonding layer 3' is a polyacrylonitrile (PAN) layer with a thickness of 1 μm and a porosity of 40%.

[0049] Preparation of diaphragm:

[0050] Using a polypropylene (PP) porous membrane as the porous membrane substrate 4, the surface of the porous membrane substrate 4 is firstly treated with a raising agent to increase its surface tension.

[0051] Silicon dioxide (SiO 2 ) ceramic particles are fully mixed with polyvinylidene fluoride (PVDF) solution to obtain a ceramic material. Then, the ceramic material is coated on both surfaces of the porous membrane substrate 4 by printing and coating, and dried to obtain a ceramic material layer 5 with a thickness of 1 μm.

[0052] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0054] The difference with embodiment 1 is:

[0055] The positive polymer adhesive layer 3 is a polyvinylidene fluoride (PEO) layer with a thickness of 2 μm and a porosity of 30%.

[0056] The negative electrode polymer bonding layer 3' is a polyacrylonitrile (PAN) layer with a thickness of 2 μm and a porosity of 50%.

[0057] Preparation of diaphragm:

[0058] Use polypropylene / polyethylene / polypropylene (PP / PE / PP) porous film as the porous film substrate 4, first adopt the pressure roller with uneven surface to press the porous film, and carry out surface treatment to the porous film substrate 4, to increase its surface tension.

[0059] Titanium dioxide (TiO 2 ) The ceramic particles are fully mixed with the styrene-butadiene rubber (SBR) solution to obtain a ceramic material. Then, the ceramic material was coated on both surfaces of the porous membrane substrate 4 by means of transfer coating, and dried to obtain a ceramic material layer 5 with a thickness of 3 μm.

...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with good safety performance, overcharge resistance and mechanical properties. The lithium ion battery comprises a positive electrode plate, a negative electrode plate, a diaphragm between the positive electrode plate and the negative electrode plate, and an electrolyte, wherein the diaphragm comprises a porous film base material and a ceramic material layer which is coated on the surface of the porous film base material; the positive electrode plate comprises a positive current collector, a positive active material layer coated on the surface of the positive current collector, and a positive polymer bonding layer coated on the positive active material layer and positioned on the surface layer; and the negative electrode plate comprises a negative current collector, a negative active material layer coated on the surface of the negative current collector, and a negative polymer bonding layer coated on the negative active material layer and positioned on the surface layer. Compared with the prior art, the lithium ion battery has good safety performance, overcharge resistance and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery with good safety performance, overcharge resistance performance and mechanical performance. Background technique [0002] Lithium-ion batteries, as a clean new energy source, have been applied in more and more fields, such as mobile phones, notebook computers, electric bicycles and power vehicles. Because these products using lithium-ion batteries as power sources are closely related to people's lives, people's requirements for their safety are getting higher and higher. [0003] Lithium-ion batteries generally include a packaging case and a battery cell contained in the packaging case. The battery cell generally includes a positive electrode, a negative electrode, an electrolyte, and a separator spaced between the positive electrode and the negative electrode. Among them, the separator is a very important component. It is a porous membrane wi...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13H01M4/62
CPCY02E60/122Y02E60/10
Inventor 陈杰莫明亮胡大林吴凯
Owner NINGDE AMPEREX TECH
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