Polymer composite membrane, preparation method thereof, polymer composite membrane prepared by method, gel electrolyte and lithium ion battery

A polymer and composite film technology, applied in the field of lithium-ion batteries, can solve the problems of poor adhesion of fiber layers

Active Publication Date: 2016-11-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a polymer composite membrane for the problem of poor bonding of the fiber layer in the polymer composite membrane in the prior art

Method used

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  • Polymer composite membrane, preparation method thereof, polymer composite membrane prepared by method, gel electrolyte and lithium ion battery
  • Polymer composite membrane, preparation method thereof, polymer composite membrane prepared by method, gel electrolyte and lithium ion battery
  • Polymer composite membrane, preparation method thereof, polymer composite membrane prepared by method, gel electrolyte and lithium ion battery

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preparation example Construction

[0045] The present invention also provides a preparation method for the above-mentioned polymer composite film, comprising the steps of:

[0046] S1, provide diaphragm;

[0047] S2. Provide a spinning solution, the spinning solution includes a mixed solvent and a spinning polymer dissolved in the mixed solvent; the mixed solvent includes a low boiling point solvent with a boiling point of 150-170°C and a boiling point of 175- A high boiling point solvent at 220°C, the mass ratio of the low boiling point solvent to the high boiling point solvent is 7:3-3:7;

[0048] S3. Using the spinning solution to perform electrospinning on the separator, and obtain a polymer composite membrane with a fiber layer on the separator after drying.

[0049] According to the present invention, as in step S1 above, a diaphragm is firstly provided, and subsequent operations are performed on the surface of the diaphragm using the diaphragm as a substrate. As mentioned above, the separator can be a ...

Embodiment 1

[0085] This example is used to illustrate the polymer composite membrane disclosed in the present invention and its preparation method, gel electrolyte and lithium ion battery.

[0086] 1. Preparation of multilayer film

[0087] SiO with an average particle size of 1 μm 2 Granules, binder (PVDF) and coating solvent (NMP) are mixed into a slurry at a weight ratio of 19:1:200, and SiO is coated on both sides of a 11 μm thick PE diaphragm by coating method 2 Particle layer, after drying, a three-layer film A1 with a thickness of 15 μm is formed, in which the thickness of the PE separator is 11 μm, and both sides of the PE separator are SiO with a thickness of 2 μm 2 Inorganic particle layer.

[0088] 2. Preparation of spinning solution

[0089] Mix NMP and DMF uniformly at a mass ratio of 7:3 to form a mixed solvent, then add PVDF, stir magnetically in a water bath at 50°C to fully dissolve, and form a spinning solution with a concentration of 15wt% P(VDF-HFP) B1.

[0090] 3...

Embodiment 2

[0096] This example is used to illustrate the polymer composite membrane disclosed in the present invention and its preparation method, gel electrolyte and lithium ion battery.

[0097] 1. Preparation of multilayer film

[0098] Al with an average particle size of 615nm 2 o 3 Granules, binder (PEO) and coating solvent (deionized water) were mixed into a slurry at a weight ratio of 9:1:67, and Al was coated on both sides of a 11 μm thick PE diaphragm by coating method 2 o 3 Particle layer, after drying, a three-layer film A2 with a thickness of 15 μm is formed, in which the thickness of the PE separator is 11 μm, and both sides of the PE separator are Al with a thickness of 2 μm 2 o 3 Inorganic particle layer.

[0099] 2. Preparation of spinning solution

[0100] Mix NMP and DMF uniformly at a mass ratio of 5:5 to form a mixed solvent, then add P(VDF-HFP), wherein the content of HFP copolymerization units is 5wt%, and magnetically stir in a water bath at 50°C to fully dis...

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Abstract

In order to solve the problem of poor cohesiveness of a fiber layer in a polymer composite membrane in the prior art, the invention provides a polymer composite membrane. The polymer composite membrane comprises a separator and a fiber layer, wherein the fiber layer is arranged on the separator, and the peel strength of the fiber layer is over 0.03kN / m. Meanwhile, the invention also discloses a preparation method of the abovementioned polymer composite membrane. Moreover, the invention also provides the polymer composite membrane obtained according to the abovementioned preparation method, a gel electrolyte comprising the abovementioned polymer composite membrane and a lithium ion battery applying the polymer composite membrane. In the polymer composite membrane provided by the invention, the fiber layer has favorable cohesiveness, particularly, the cohesiveness between filaments in the fiber layer is high, and a positive / negative electrode and the separator can be effectively bonded into a whole; high porosity of the fiber layer is beneficial for improving the ionic conductivity; and when the polymer composite membrane provided by the invention is used for the lithium ion battery, the rate performance, the cycle performance and the safety of the lithium ion battery are greatly improved, and the service lifetime of the lithium ion battery is long.

Description

technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a polymer composite membrane and a preparation method thereof, a polymer composite membrane prepared by the preparation method and a gel electrolyte using the polymer composite membrane, and a gel electrolyte using the gel electrolyte Lithium Ion Battery. Background technique [0002] With the development of portable electronic devices and the application of lithium-ion batteries in electric vehicles, the industry's requirements for lithium-ion battery performance (such as energy density, power density, etc.) are getting higher and higher. Moreover, the requirements for the safety performance of lithium-ion batteries are also more stringent. At present, all solid polymer electrolytes (SPE) or gel polymer electrolytes (GPE) are usually used to improve the safety performance of lithium-ion batteries. [0003] However, due to the low room temperature conductivity of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M2/14H01M10/0525H01M50/403H01M50/411H01M50/44H01M50/449H01M50/457H01M50/491H01M50/497
CPCH01M10/0525D01D5/0084D01F6/12D01F6/32Y02E60/10H01M50/403H01M50/446H01M50/457H01M50/491
Inventor 金丽娜胡家玲单军何龙
Owner BYD CO LTD
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