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Lithium ion battery diaphragm, preparation method thereof and lithium ion battery

A technology for lithium ion batteries and separators, which is applied in the field of battery materials and their preparation, can solve the problems that affect the mechanical properties of battery safety performance, the pore size and porosity of separators are difficult to control, and the structure of polymer separators is difficult to control, etc., so as to achieve good ionic conductivity. , The effect of small electrochemical impedance value and good electrochemical performance

Inactive Publication Date: 2017-01-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dry process is simple in production process and low in raw material cost, the diaphragm prepared by this method also has disadvantages such as difficult control of pore size and porosity, and poor absorption of electrolyte.
The process of the phase inversion method is relatively complicated, and the structure of the prepared polymer separator is not easy to control, and its cross-section is easy to form a penetrating macroporous structure, which affects its mechanical properties and the safety performance of the battery.

Method used

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  • Lithium ion battery diaphragm, preparation method thereof and lithium ion battery
  • Lithium ion battery diaphragm, preparation method thereof and lithium ion battery
  • Lithium ion battery diaphragm, preparation method thereof and lithium ion battery

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preparation example Construction

[0036] see figure 1 , the first embodiment of the present invention provides a method for preparing a lithium-ion battery separator, comprising the steps of:

[0037] S1: Provide PVDF-HFP solution, the PVDF-HFP solution is a mixed solution of PVDF-HFP, solvent and non-solvent;

[0038] S2: The PVDF-HFP solution is formed into a diaphragm through an ultrasonic atomization spraying process.

[0039] In the embodiment of the present invention, in the method of PVDF-HFP solution provided, PVDF-HFP, solvent, and non-solvent can be mixed in any order or at the same time. Specifically, the method of PVDF-HFP solution provided can be : Weigh the dried PVDF-HFP and add it into the mixed solution of solvent and non-solvent to stir at a low speed for 1.5-4h to obtain the PVDF-HFP solution.

[0040] The method of the provided PVDF-HFP solution can also be: weigh the dried PVDF-HFP and add it to the solvent, after the PVDF-HFP is dissolved in the solvent, then add a non-solvent and stir ...

no. 1 Embodiment

[0058] PVDF-HFP was added to a mixed solvent of acetone and tetrahydrofuran, and deionized water was added as a non-solvent, and the above solution was stirred at 60° C. for 2 h to completely dissolve PVDF-HFP. Wherein, the mass ratio of PVDF-HFP:(acetone+tetrahydrofuran):deionized water is 2:90:8; and in the solvent, the mass ratio of acetone:tetrahydrofuran is 1:1. The prepared PVDF-HFP solution was prepared by the above-mentioned ultrasonic atomization spraying method to obtain a diaphragm.

[0059] Detection method 1: Cut the above-prepared separator into 2cm×2cm, and use scanning electron microscope to characterize it.

[0060] Test result: if image 3 As shown, it can be seen that the distribution of micropores on the surface of the separator is uniform, and the pore size of the surface micropores is uniform, which is between 0.3um-1.5um.

[0061] Detection method 2: Cut the above diaphragm into 12mm×12mm, use 1mol / L LiPF6 (lithium hexafluorophosphate)-EC (Ethylene car...

no. 2 Embodiment

[0066] The difference between the second specific embodiment and the first specific embodiment is that the mass ratio of PVDF-HFP:(acetone+tetrahydrofuran):deionized water is 4:88:8.

[0067] Detection method 1: Cut the above-prepared separator into 2cm×2cm, and use scanning electron microscope to characterize it.

[0068] Test result: if Figure 7 As shown, it can be seen that the separator includes uniformly distributed micropores, and the pore size of the surface micropores is relatively uniform, ranging from 0.3um to 2.5um.

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Abstract

The invention relates to the field of battery materials and preparation thereof, and particularly relates to a lithium ion battery diaphragm, a preparation method thereof and a lithium ion battery. The preparation method of the lithium ion battery diaphragm provided by the invention comprises the following steps: S1, providing a PVDF-HFP solution which is a mixed solution of PVDF-HFP, a solvent and a non-solvent; and S2, carrying out an ultrasonic atomization spaying process on the PVDF-HFP solution to form the diaphragm. The invention also provides the lithium ion battery diaphragm and the lithium ion battery. The lithium ion battery diaphragm provided by the invention cannot be dissolved into common electrolyte easily, and has the advantages of relatively high ionic conductivity and porosity and the like, and the lithium ion battery has relatively good electrochemical performance.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of battery materials and preparation thereof, in particular to a lithium-ion battery diaphragm, a preparation method thereof, and a lithium-ion battery. [0003] 【Background technique】 [0004] Lithium-ion battery separators generally should have good ion conductivity, porosity, etc. The physical and chemical properties of lithium-ion battery separators not only depend on the matrix of the separator material, but also are closely related to the preparation technology of the separator. [0005] The existing methods for preparing lithium-ion battery separators are mainly dry process and phase inversion method. Although the dry process has a simple production process and low raw material cost, the separator prepared by this method also has disadvantages such as difficult control of pore size and porosity, and poor absorption of electrolyte. The process of the phase inversion method is relatively complicated, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/426H01M50/491
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 向勇魏乐乐井二宝刘雯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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