Porous membrane reinforced polymer-plastic solid electrolyte membrane, preparation method thereof and application thereof

A technology of solid electrolyte membrane and solid electrolyte layer, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., can solve the problems of increasing battery volume energy density, great influence on conductivity, poor mechanical properties, etc., and achieve improved cycle stability , Improve the mechanical properties, the effect of good mechanical properties

Active Publication Date: 2019-07-12
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polymer-plastic crystal solid electrolyte membrane reported so far has several significant shortcomings that inhibit its wide application in solid lithium batteries: 1. The polymer-plastic crystal solid electrolyte membrane is difficult to build on the premise of self-supporting The lower thickness should be less than 100μm, too thin polymer-plastic crystal solid electrolyte membrane has poor mechanical properties, and thick solid electrolyte membrane greatly increases the volumetric energy density of the battery
2. The melting point of th...

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  • Porous membrane reinforced polymer-plastic solid electrolyte membrane, preparation method thereof and application thereof
  • Porous membrane reinforced polymer-plastic solid electrolyte membrane, preparation method thereof and application thereof
  • Porous membrane reinforced polymer-plastic solid electrolyte membrane, preparation method thereof and application thereof

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preparation example Construction

[0041] Another aspect of the embodiments of the present invention provides a method for preparing a porous membrane-reinforced polymer-plastic crystal solid electrolyte membrane, comprising:

[0042] Uniformly mixing the polymer, inorganic lithium salt and plastic crystal compound in a low boiling point solvent to form a homogeneous solution;

[0043] The homogeneous solution is applied to the surface of the porous membrane, and the solvent is removed, followed by vacuum drying to obtain a polymer-plastic solid electrolyte membrane reinforced by the porous membrane.

[0044] Further, in some more specific implementation cases, the porous membrane-reinforced polymer-plastic crystal solid electrolyte membrane can be supported by a porous membrane, and a homogeneous solution of a polymer, an inorganic lithium salt, and a plastic crystal compound It is prepared by coating on both sides of the porous membrane and drying in vacuum.

[0045] In some preferred embodiments, the weight...

Embodiment 1

[0073] Embodiment 1 This embodiment relates to a kind of preparation technology of the flexible (PVDF-HFP) / LiTFSI / succinonitrile solid electrolyte membrane that the PVDF-HFP porous membrane that content of lithium salt is 20wt% strengthens, and it comprises:

[0074] Weigh 2g of lithium salt LiTFSI and 6g of plastic crystal compound succinonitrile into N,N-dimethylformamide, after it is completely dissolved, add 2g of polymer (PVDF-HFP) and stir overnight to completely dissolve , dispersed evenly, and then dried the PVDF-HFP porous membrane with a thickness of 10 μm at 80 ° C, put it into a stainless steel abrasive tool of the same size, poured the above mixed solution on the PVDF-HFP porous membrane, and protected it under Ar gas The solvent was evaporated at 50°C and dried for 2 days in a vacuum oven at 50°C to prepare a PVDF-HFP porous membrane reinforced (PVDF-HFP) / LiTFSI / succinonitrile solid electrolyte membrane (named PPCE-1) with a thickness of 100 μm. The mass percenta...

Embodiment 2

[0075] Embodiment 2 This embodiment relates to a preparation process of a flexible (PVDF-HFP) / LiTFSI / succinonitrile solid electrolyte membrane reinforced by a PVDF-HFP porous membrane with a lithium salt content of 30 wt%, which includes:

[0076] Weigh 3g of lithium salt LiTFSI and 5g of succinonitrile into N,N-dimethylformamide, after it is completely dissolved, add 2g of polymer (PVDF-HFP), stir overnight to make it all dissolve and disperse evenly , then dry the PVDF-HFP porous membrane with a thickness of 10 μm at 80°C, put it into a stainless steel grinding tool of the same size, pour the above mixed solution on the PVDF-HFP porous membrane, and evaporate the solvent under the protection of Ar gas , dried in a vacuum oven at 50°C for 2 days to prepare a 100 μm PVDF-HFP porous membrane reinforced (PVDF-HFP) / LiTFSI / succinonitrile solid electrolyte membrane (named PPCE-2), wherein the mass percentages were 20wt% PVDF-HFP, 30wt% LiTFSI, 50wt% SN.

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Abstract

The invention discloses a porous membrane reinforced polymer-plastic solid electrolyte membrane, a preparation method thereof and application thereof. The polymer-plastic solid electrolyte membrane includes a support layer including a porous membrane and a polymer-plastic solid electrolyte layer covering at least one side of the surface of the porous membrane, wherein the porous membrane plays therole of a support frame and has a continuous three-dimensional network structure, the mechanical properties of the solid electrolyte membrane can be improved, and at the same time, the preparation ofa thinner solid electrolyte membrane is facilitated by the porous membrane support frame. The polymer-plastic solid electrolyte layer contains a polymer, lithium salt and a plastic crystal compound,and a porous membrane reinforced flexible polymer-plastic solid electrolyte membrane with high voltage resistance and high low-temperature conductivity can be obtained by optimizing the proportions ofthe polymer, the lithium salt and the plastic crystal. The polymer-plastic solid electrolyte membrane can be applied to an all-solid lithium-ion battery, the preparation process is simple, and the polymer-plastic solid electrolyte membrane is suitable for industrial production.

Description

technical field [0001] The invention relates to a solid electrolyte membrane, in particular to a porous membrane reinforced, high voltage resistant, high low temperature conductivity, flexible polymer-plastic crystal solid electrolyte membrane, its preparation method and application, belonging to new energy and new material technologies. Background technique [0002] Lithium-ion batteries widely use liquid electrolytes containing organic solvents. These liquid organic solvents are easy to burn, volatilize, and oxidize, especially under extreme working conditions such as overcharge, overdischarge, and high-power charge and discharge, which will generate a lot of heat and accelerate gas. resulting in serious safety hazards. Polymer solid electrolytes are generally made of polymer matrix and inorganic lithium salts. They behave as solids, but they can support the migration of lithium ions like liquids, which can effectively overcome the safety problems of liquid electrolytes s...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 许晶晶卢威吴晓东
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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