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Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm

A polymer material, lithium-ion battery technology, used in secondary batteries, battery pack components, circuits, etc., can solve the problems of easy pore deformation, poor performance, high battery self-discharge rate, and achieve easy pore deformation, The effect of making holes evenly and reducing potential safety hazards

Active Publication Date: 2015-04-08
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercialized lithium-ion battery separators are mostly porous polymer membranes made of polypropylene and polyethylene. This separator can effectively conduct ion conduction and isolate electrons inside the battery, and is a barrier to protect the safety performance of the battery. , polymer materials have excellent porosity, and the tensile properties and strength are suitable for our existing product technology. However, the disadvantage is that polymer materials will shrink to varying degrees at high temperatures. Traditional polypropylene, polyethylene Take dilute materials as an example. When the temperature exceeds 100 degrees Celsius, obvious heat shrinkage will occur, which will cause direct contact between positive and negative active materials inside the battery, causing safety problems. At the same time, the polymer microporous membrane has poor liquid absorption performance. , cannot maintain a sufficient amount of electrolyte during the entire life of the battery, resulting in poor battery cycle performance. In this case, high-temperature resistant membranes made of fibrous non-woven fabrics and other materials have appeared. Uneven, high battery self-discharge rate, poor puncture strength, low tensile strength, easy hole deformation under high tension, poor processing performance also brings other safety hazards

Method used

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  • Non-woven fabric polymer composite diaphragm and lithium ion battery containing non-woven fabric polymer composite diaphragm

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Embodiment 1

[0024] A non-woven polymer material composite diaphragm, including a base material and a polymer material layer coated on the surface of the base material, the base material is a non-woven fabric with a thickness of 10 μm, and the non-woven fabric is a non-woven fabric prepared from cellulose fibers. The woven polymer material layer is a particle coating with a particle size of 10 μm and a thickness of 1 μm. The composite diaphragm is prepared by the following steps. Select a granular polymer material with a particle size of 10 μm, and heat the polymer material particles at 100 ° C. Baking in a vacuum state for 8 hours, then dissolving the baked polymer material particles in acetone according to the mass ratio of 1:99, dispersing at high speed to form a slurry, and then coating the slurry with anilox roller or soaking method Evenly coated on the surface of the base material, after coating, the solvent component is dried in an oven to obtain a polymer non-woven material composit...

Embodiment 2

[0027] A non-woven polymer material composite diaphragm, including a base material and a polymer material layer coated on the surface of the base material, the base material is a non-woven fabric with a thickness of 40 μm, and the non-woven fabric is a non-woven fabric prepared from cellulose fibers. The woven polymer material layer is a particle coating with a particle size of 0.1 μm and a thickness of 5 μm. The composite diaphragm is prepared by the following steps. Select a granular polymer material with a particle size of 0.1, and place the polymer material particles at 100 Baking under vacuum at ℃ for 8 hours, then dissolve the baked polymer material particles in acetone according to the mass ratio of 1:99, disperse at a high speed to form a slurry, and then use an anilox roller to coat or infiltrate the slurry The method is uniformly coated on the surface of the substrate, and then dried in an oven to dry the solvent component to obtain a polymer non-woven material compos...

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Abstract

The invention relates to the technical field of lithium ion batteries and especially relates to a non-woven fabric polymer composite diaphragm and a lithium ion battery containing the non-woven fabric polymer composite diaphragm. The non-woven fabric polymer composite diaphragm comprises a base and a polymer coating the surface of the base. The base is prepared from a non-woven fabric and the polymer coating is a particle coating with particle sizes of 0.1-10 microns. The non-woven fabric polymer composite diaphragm has high temperature resistance. The polymer microporous membrane has good liquid absorbency and can adsorb enough electrolyte in a cell full-life stage so that cell cycle performances are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a non-woven polymer material composite diaphragm and a lithium ion battery using the diaphragm. Background technique [0002] Compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of large specific capacity, high working voltage, fast charging speed, wide working temperature range, long cycle life, small size, light weight, green and pollution-free, etc. At present, it has been widely used in mobile phones, notebook computers, electric tools and other fields, and its application scope is becoming more and more extensive. The rapid development of new digital electronic products has put forward more and more demands on the energy density and high reliability of lithium-ion batteries. High requirements, the present invention is produced under this background, and proposes a composite diaphragm material fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/426H01M50/44
CPCH01M10/0525H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 叶新文颜雪冬马伟华王树增
Owner NINGBO VEKEN BATTERY
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