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Polymer composite film and preparation method thereof, and lithium ion battery

A polymer and composite film technology, used in secondary batteries, circuits, electrical components, etc., can solve problems such as poor mechanical strength, improve heat shrinkage resistance and mechanical strength, improve heat shrinkage resistance and mechanical strength, The effect of improving the mechanical strength

Active Publication Date: 2017-06-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a polymer composite membrane for the problem of poor mechanical strength of the polymer composite membrane in the prior art

Method used

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  • Polymer composite film and preparation method thereof, and lithium ion battery
  • Polymer composite film and preparation method thereof, and lithium ion battery

Examples

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preparation example Construction

[0054] The present invention also provides a preparation method of the above-mentioned polymer composite membrane,

[0055] Including the following steps:

[0056] S1, provide diaphragm;

[0057] S2, providing a spinning solution; the spinning solution includes a solvent and a spinning polymer dissolved in the solvent;

[0058] S3, using the spinning solution to prepare a fiber layer on the diaphragm, and obtain a polymer composite membrane with a fiber layer on the diaphragm after drying;

[0059] The method for preparing the fiber layer is high-speed electrospinning or auxiliary electric field electrospinning;

[0060] The high-speed electrospinning method is as follows: electrospinning is performed under the condition that the rotating speed of the collection device for collecting fibers is 1000-6000 rpm;

[0061] The method of described auxiliary electric field electrospinning is:

[0062] An auxiliary electrode is provided on the side of the collection device away fro...

Embodiment 1

[0112] This example is used to illustrate the polymer composite membrane disclosed in the present invention and its preparation method.

[0113] 1. Preparation of diaphragm

[0114] Al with an average particle size of 615nm 2 o 3 Granules, binder (PEO) and coating solvent (deionized water) are mixed into a slurry at a weight ratio of 24:1:500, and the surface of a 12 μm thick PE film is coated with Al 2 o 3 The granular layer, after drying, forms a double-layer film A1 with a thickness of 15 μm (its surface structure is as figure 1 shown), where the thickness of the PE film is 12 μm, and the surface of the PE film has Al with a thickness of 3 μm 2 o 3 Inorganic particle layer.

[0115] 2. Preparation of spinning solution

[0116] Spinning polymer (polyacrylonitrile) was added to the solvent NMP, and magnetically stirred under a water bath at 50° C. to fully dissolve to form a spinning solution with a concentration of 5 wt%.

[0117] 3. Preparation of polymer composite ...

Embodiment 2

[0132] This example is used to illustrate the polymer composite membrane disclosed in the present invention and its preparation method.

[0133] 1. Preparation of diaphragm

[0134] Al with an average particle size of 615nm 2 o 3 The particles, binder (PEO) and coating solvent (deionized water) were mixed into a slurry at a weight ratio of 24:1:500, and both surfaces of the 11 μm thick PE film were coated with Al 2 o 3 Particle layer, dried to form a three-layer film A2 with a thickness of 15 μm, in which the thickness of the PE film is 11 μm, and both surfaces of the PE film have Al with a thickness of 2 μm 2 o 3 Inorganic particle layer.

[0135] 2. Preparation of spinning solution

[0136] Spinning polymers polyetherimide and polyacrylonitrile were respectively added to two parts of solvent NMP, fully dissolved by magnetic stirring in a water bath at 50° C. to form two parts of spinning solutions with concentrations of 20 wt % and 10 wt % respectively.

[0137] 3. Pr...

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Abstract

In order to solve the problem of poor mechanical strength of the polymer composite film in the prior art, the invention provides a polymer composite film which comprises a porous diaphragm and a fiber layer positioned on the diaphragm, wherein at least one fiber bundle is arranged in the fiber layer; and each fiber bundle comprises a plurality of fibers arranged in parallel. The invention also provides a preparation method of the polymer composite film and a lithium ion battery using the polymer composite film. The polymer composite film provided by the invention has favorable mechanical strength.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a polymer composite membrane and a preparation method thereof, and a lithium ion battery using the gel electrolyte. Background technique [0002] Lithium-ion batteries are mainly composed of positive / negative electrode materials, electrolytes, separators and battery casing packaging materials. The separator is an important part of the lithium-ion battery, which plays the role of separating the positive and negative electrodes, preventing the internal short circuit of the battery, allowing the electrolyte ions to pass freely, and completing the electrochemical charge and discharge process. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and safety performance of the battery. The separator with excellent performance plays an important role in improving the overall performance of th...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525D01D5/00D04H1/728
CPCD01D5/0084D01D5/0092D04H1/728H01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 冯大利宋威胡家玲金丽娜单军何龙
Owner BYD CO LTD
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