Lithium ion battery composite membrane, preparation method thereof and lithium ion battery

A lithium-ion battery and composite diaphragm technology, which is applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve the problem of decreased energy density of battery systems, difficulty in ensuring uniform thickness, and cumbersome coating process and other problems, to achieve excellent thermal stability, avoid further expansion of thermal runaway, and simple preparation process

Inactive Publication Date: 2021-06-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating film obtained by this method is not only complicated in process, but also difficult to ensure a uniform thickness. The most important thing is that the weight of the coating film obtained by this method increases by at least 50%, which will make the system energy density of the battery drop virtually.

Method used

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  • Lithium ion battery composite membrane, preparation method thereof and lithium ion battery
  • Lithium ion battery composite membrane, preparation method thereof and lithium ion battery

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preparation example Construction

[0034] A second aspect of the present invention provides a method for preparing a lithium-ion battery composite diaphragm as described in any one of the first aspect of the present invention, comprising the following steps:

[0035] Dissolving the exfoliated Boron Nitride nanosheets in an organic solvent to obtain a first solution;

[0036] Dissolving P(VDF-HFP) powder in an organic solvent to obtain a second solution;

[0037] After the first solution and the second solution are uniformly mixed, they are coated on the surface of the base film and dried to obtain a lithium-ion battery composite separator.

[0038] The preparation method adopts the method of oil-based mixed coating, and the process is simple, does not require multiple coatings, and is easy to realize industrialization.

[0039] Further, the selection of the organic solvent in the first solution and the second solution in the present invention is not particularly limited, as long as it meets the purpose of diss...

Embodiment 1

[0047] Add 0.6kg of stripped Boron Nitride nanosheets (thickness 1-10nm, size 100-500nm) into 200kg NMP to dissolve, fully stir and dissolve to obtain the first solution;

[0048] Add 20kg of P(VDF-HFP) powder into 200kg of NMP to dissolve, fully stir and dissolve to obtain the second solution;

[0049] After mixing the first solution and the second solution, fully stir them evenly, and apply them on the surface of the PE base film with a micro-gravure roller to prepare a lithium-ion battery composite separator. The thickness of the coating layer is 1 μm, and the surface density is 0.5g / m 2 .

Embodiment 2

[0051] Add 0.6kg of stripped Boron Nitride nanosheets (thickness 1-10nm, size 100-500nm) into 200kg acetone to dissolve, fully stir and dissolve to obtain the first solution;

[0052] Add 60kg of P(VDF-HFP) powder into 200kg of acetone to dissolve, fully stir and dissolve to obtain the second solution;

[0053] After mixing the first solution and the second solution, stir well and apply it on the surface of the PP separator with a micro-concave roller to prepare a lithium-ion battery composite separator. The thickness of the coating layer is 5 μm, and the surface density is 3.5 g / m 2 .

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Abstract

The invention discloses a lithium ion battery composite membrane, a preparation method thereof and a lithium ion battery. The lithium ion battery composite membrane comprises a base membrane and a coating layer, and the coating layer is composed of a stripping Boron Nitride nanosheet and P (VDF-HFP) powder. The lithium ion battery composite membrane has the advantage of light weight, the heat conduction has obvious directivity, the expansion of thermal runaway of the lithium ion battery can be prevented when the lithium ion battery composite membrane is applied to the lithium ion battery, the safety of the lithium ion battery is ensured, the preparation process is simple, and industrial production and application are easy.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a lithium-ion battery composite diaphragm and a preparation method thereof, and also relates to a lithium-ion battery containing the lithium-ion battery composite diaphragm. Background technique [0002] In recent years, with the vigorous development of new energy sources, power lithium-ion batteries with high energy density, excellent safety, and excellent cruising range have attracted more and more attention. As one of the four key main materials of lithium-ion batteries, the separator plays the role of isolating the positive and negative electrodes and allowing lithium ions to pass freely. The quality of its performance directly affects the capacity, cycle performance and safety performance of the battery. With the improvement of battery energy density and the increase of single cell capacity, the requirements for the consistency and safety p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/403H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 汪杰曹勇苏峰屈杨宣健张壁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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