Organic-inorganic composite electrolyte membrane, preparation method and application thereof

An electrolyte membrane and inorganic composite technology, which is used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problem of no corresponding reduction in electrolyte consumption, affecting the appearance and super-thickness of cells, and swelling of soft-pack cells, etc. problems, to achieve the effect of increasing the number of migrations, strengthening the link, and increasing the liquid retention capacity

Active Publication Date: 2015-04-08
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to meet customers' requirements for higher and higher energy density of batteries, major battery manufacturers fill the same volume with as much active material as possible by increasing the compaction density of the pole piece and reducing the thickness of the separator, which makes the battery The space left for the electrolyte inside the cell is reduced, but the consumption of the electrolyte is not reduced accordingly, which causes the problem of liquid swelling in the soft package battery; and the liquid swelling will affect the appearance of the battery cell and problems such as ultra-thickness, directly affecting Cell shipments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Preparation of Porous Organic-Inorganic Composite Particles

[0061] The urea-formaldehyde resin was added to an appropriate amount of deionized water, magnetically stirred to form a viscous solution, and then the porous Al 2 o 3 (porosity 80%) stirring to obtain a uniform suspoemulsion, and after the suspension is spray-dried at 160° C., porous organic-inorganic composite particles with a particle size of 500-2000 nm are obtained. In the porous organic-inorganic composite particle, the percentage content of urea-formaldehyde resin is 5wt%.

[0062] Preparation of Organic-Inorganic Composite Electrolyte Membrane

[0063] After the porous organic-inorganic composite particles were dispersed in the solvent DMF by ultrasonic oscillation for 30 minutes, an appropriate amount of polymer matrix PVDF-HFP and pore-forming agent PEG-200 (polyethylene glycol with an average molecular weight of 200) was weighed and added to the dispersed solution, wherein the mass ratio of poro...

Embodiment 2

[0067] Preparation of Porous Organic-Inorganic Composite Particles

[0068] The preparation steps are the same as in Example 1, except that the porous Al used 2 o 3 The porosity is 50%.

[0069] Preparation of Organic-Inorganic Composite Electrolyte Membrane

[0070] Preparation steps and ratio of raw materials are the same as in Example 1.

[0071] Electrolyte membrane activation and parameters

[0072] The activation steps of the electrolyte membrane are the same as in Example 1.

[0073] Its ionic conductivity was tested by AC impedance method to be 2.5mS / cm. Its electrochemical stability window was tested by linear scanning method>5.4V. The breaking strength measured by tensile machine is >12MPa, the porosity is >48% measured by mercury porosimetry, the average pore diameter of the outer layer is 500nm, and the average pore diameter of the inner layer is 50nm.

Embodiment 3

[0075] Preparation of Porous Organic-Inorganic Composite Particles

[0076] The preparation steps are the same as in Example 1, except that the porous Al used 2 o 3 The porosity is 95%.

[0077] Preparation of Organic-Inorganic Composite Electrolyte Membrane

[0078] Preparation steps and ratio of raw materials are the same as in Example 1.

[0079] Electrolyte membrane activation and parameters

[0080] The activation steps of the electrolyte membrane are the same as in Example 1.

[0081] Its ionic conductivity was tested by AC impedance method to be 4.6mS / cm. Its electrochemical stability window was tested by linear scanning method>5.6V. The breaking strength measured by tensile machine is >15MPa. The porosity measured by mercury porosimetry is more than 65%, the average pore diameter of the outer layer is 600nm, and the average pore diameter of the inner layer is 80nm.

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Abstract

The application discloses an organic-inorganic composite electrolyte membrane. The electrolyte membrane is a porous polymer membrane containing porous organic-inorganic composite particles, wherein each porous organic-inorganic composite particle contains porous inorganic substances and thermosetting resin. The electrolyte membrane has an abundant pore structure and a high porosity while keeping the low crystallinity of a polymer, and thus the ionic conductivity of the electrolyte membrane can be greatly increased; the porous inorganic particles are capable of forming abundant ion channels in the interiors besides improving the liquid-retaining capacity of the electrolyte membrane and prolonging the cycle life of a cell, and thus the ionic conductivity and the electrochemical stability window of the electrolyte membrane are further improved and the requirements of high-voltage system applications can be achieved.

Description

technical field [0001] The application relates to an electrolyte membrane, its preparation method and application, and belongs to the field of battery materials. Background technique [0002] With the increasingly prominent problems of environmental pollution, energy crisis and resource shortage, countries all over the world are paying more and more attention to the development of high-efficiency, clean, renewable energy and electric vehicles and other related technologies. [0003] In recent years, with the popularity of portable electronic devices and the development of electric vehicles, lithium-ion batteries as a new generation of high-energy power sources have received great attention. The gel polymer electrolyte lithium-ion battery not only has the advantages of high specific capacity, high working voltage, high cycle life, no memory effect, and environmental friendliness, but also is safe, flexible, and easy to process. Since it was put on the market in 1999, Immedia...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/446H01M50/491
CPCH01M10/056H01M10/0565H01M10/058Y02E60/10
Inventor 黄思林陈宏浩周世波林永寿付成华
Owner DONGGUAN AMPEREX TECH
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