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Composite solid electrolyte membrane, preparation method and lithium-ion battery

A technology of solid electrolyte membrane and electrolyte, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low room temperature conductivity, poor mechanical strength, poor interface compatibility between the membrane and positive and negative electrodes, and improve cycle performance , to ensure the flexibility of the film and enhance the mechanical strength

Active Publication Date: 2017-05-10
重庆冠宇电池有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a composite solid electrolyte membrane and its manufacturing method, as well as a lithium ion battery using the electrolyte membrane, to solve the problems of low room temperature conductivity, poor mechanical strength and the interface between the membrane and the positive and negative electrodes existing in the composite electrolyte membrane. The problem of poor compatibility

Method used

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  • Composite solid electrolyte membrane, preparation method and lithium-ion battery
  • Composite solid electrolyte membrane, preparation method and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Dissolve PEO and LiTFSI in acetonitrile according to the ratio of lithium to oxygen ratio of 1:13 to form an organic polymer electrolyte gel with a solid content of 5%, and then add LLTO to mix and disperse to form the first composite gel with an inorganic ratio of 60%; PEO and LiTFSI are dissolved in acetonitrile according to the ratio of lithium to oxygen ratio of 1:18 to form an organic polymer electrolyte gel with a solid content of 6%, and then add lithium, lanthanum, zirconium and oxygen to mix and disperse to form a second composite gel with an inorganic ratio of 10%. ;

[0043] Coating the first composite adhesive on both sides of the glass fiber net, evaporating the solvent at 80°C, and then coating the second composite adhesive on the first composite adhesive layer, and evaporating the solvent at 90°C, to obtain a composite solid electrolyte membrane;

[0044] A solid-state lithium-ion battery is made by using a composite solid electrolyte membrane with a lith...

Embodiment 2

[0050] Copolymer of PEO and PPO with LiClO 4 Dissolve in water according to the ratio of lithium to oxygen ratio 1:40 to form an organic polymer electrolyte gel with a solid content of 1%, and then add LLZO to mix and disperse to form the first composite gel with an inorganic ratio of 10%; PEO copolymer and LiClO 4 Dissolve in water according to the lithium-oxygen ratio of 1:40 to form an organic polymer electrolyte gel with a solid content of 1%, and then add lithium, lanthanum, zirconium, and oxygen to mix and disperse to form a second composite gel with an inorganic ratio of 5%;

[0051] Double-sidedly coat the first composite adhesive on the electrospinning separator, evaporate the solvent at 150°C, then apply the second composite adhesive on the first composite adhesive layer, and evaporate the solvent at 150°C to obtain a composite solid electrolyte membrane;

[0052] A solid-state lithium-ion battery is formed by using a composite solid electrolyte membrane with a lith...

Embodiment 3

[0058] Dissolve PEC and LiBOB in NMP at a lithium-to-oxygen ratio of 1:5 to form an organic polymer electrolyte gel with a solid content of 10%, and then add LATP to mix and disperse to form the first composite gel with an inorganic ratio of 30%; PEC and LiBOB are dissolved in water according to the lithium-oxygen ratio of 1:6 to form an organic polymer electrolyte gel with a solid content of 9%, and then add lithium, lanthanum, zirconium, and oxygen to mix and disperse to form a second composite gel with an inorganic ratio of 15%;

[0059] Double-sidedly coat the first composite adhesive on the non-woven fabric separator, evaporate the solvent at 150°C, then apply the second composite adhesive on the first composite adhesive layer, and evaporate the solvent at 130°C to obtain a composite solid electrolyte membrane;

[0060] A solid-state lithium-ion battery is made by using a composite solid electrolyte membrane with a ternary material positive electrode sheet and a lithium n...

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Abstract

The invention provides a composite solid electrolyte membrane, a preparation method and a lithium-ion battery. The composite solid electrolyte membrane comprises a porous support material, first compound adhesive layers coating two side surfaces of the porous support material, and second compound adhesive layers coating the first compound adhesive layers, wherein the inorganic proportion of the second compound adhesive layers is smaller than that of the first compound adhesive layers. The porous support material is added to the electrolyte membrane, so that the flexibility of the membrane is ensured, the mechanical strength of the membrane is strengthened, the interfacial compatibility can be improved by the electrolyte membrane of a sandwich structure and the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite solid electrolyte membrane, a preparation method thereof, and a solid lithium ion battery prepared by using the solid electrolyte membrane. Background technique [0002] Lithium-ion batteries are widely used in mobile communication equipment, notebook computers, digital cameras and other electronic products due to their high energy density, long cycle life and environmental friendliness, and are gradually playing a role in the fields of electric vehicles and energy storage. Currently, the most widely used commercial lithium-ion batteries are assembled using materials such as positive and negative electrodes, liquid electrolytes, and polyolefin separators. Because the liquid electrolyte is flammable and explosive, and the polyolefin separator is easy to shrink or melt when heated, it is easy to cause the battery to short-circuit and explode, w...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565Y02E60/10
Inventor 赵伟李俊义徐延铭
Owner 重庆冠宇电池有限公司
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