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

A solid-state electrolyte membrane and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as inability to meet requirements

Active Publication Date: 2020-10-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic conductivity and mechanical strength obtained by existing research still cannot meet the current requirements of lithium-ion batteries for electrolyte membranes.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1 proposes a composite solid electrolyte membrane, which is prepared by the following method:

[0056] (1) 18 parts by weight of Li 6 P.S. 5 Cl (average particle size is about 10nm), 17 parts by weight polystyrene (average molecular weight is about 320,000), 5 parts by weight of dinitrosopentamethylenetetramine, and 60 parts by weight of toluene are prepared into a spinning stock solution.

[0057] (2) Electrospinning the spinning stock solution to obtain a composite fiber with a diameter of about 150nm, wherein the spinning parameters are set as follows: the diameter of the spinning needle tube is about 200nm, the voltage is about 40kV, the receiving distance is about 40cm, and the solution flow rate About 1mL / h.

[0058](3) Calcining the composite fiber at about 550° C. for about 12 hours, and then treating the above composite fiber with a high-speed shear to obtain an inorganic electrolyte porous fiber with an average length of about 5 μm, such as figur...

Embodiment 2

[0061] Embodiment 2 proposes a composite solid electrolyte membrane, which is prepared by the following method:

[0062] (1) 15 parts by weight of Li 2 Ti 3 o 7 (the average particle diameter is about 50nm), 10 parts by weight of polyvinylidene fluoride (average molecular weight is about 1 million), 3 parts by weight of diisopropyl azodicarboxylate, and 72 parts by weight of NMP to prepare the spinning stock solution.

[0063] (2) Electrospinning the spinning stock solution to obtain a composite fiber with a diameter of about 400nm, wherein the spinning parameters are set as follows: the diameter of the spinning needle tube is about 400nm, the voltage is about 45kV, the receiving distance is about 50cm, and the solution flow rate About 1mL / h.

[0064] (3) Calcining the composite fiber at about 920° C. for about 1 h, and then treating the composite fiber with a high-speed shearing machine to obtain an inorganic electrolyte porous fiber with an average length of about 5 μm. ...

Embodiment 3

[0067] Embodiment 3 proposes a composite solid electrolyte membrane, which is prepared by the following method:

[0068] (1) 22 parts by weight of Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 (the average particle diameter is about 750nm), 7 parts by weight of polyvinylpyrrolidone (average molecular weight is about 420,000), 1 part by weight of azodicarbonamide, and 80 parts by weight of ethanol are prepared into a spinning stock solution.

[0069] (2) Electrospinning the spinning stock solution to obtain a composite fiber with a diameter of about 9000nm, wherein the spinning parameters are set as follows: the diameter of the spinning needle tube is about 9000nm, the voltage is about 40kV, the receiving distance is about 55cm, and the solution flow rate About 1mL / h.

[0070] (3) Calcining the composite fiber at about 1200° C. for about 0.5 h, and then using a high-speed shear to process the composite fiber to obtain an inorganic electrolyte porous fiber with an average length of about ...

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Abstract

The invention provides a composite solid electrolyte membrane, a preparation method thereof and a lithium ion battery. The composite solid electrolyte membrane is prepared from the following components in percentage by mass: 0.1 to 80 percent of inorganic electrolyte porous fiber, 20 to 99.8 percent of polymer electrolyte and 0.1 to 20 percent of plasticizer. According to the composite solid electrolyte membrane, an inorganic electrolyte and a polymer electrolyte are compounded, the material structure and composition are reasonably designed, and the inorganic electrolyte is designed into a porous fiber structure; by utilizing the physical adsorption and chemical adsorption effects of the pores, and by adding small molecular substances such as a plasticizer, inorganic powder filler and thelike in the pores, the interface contact between the polymer electrolyte and the inorganic electrolyte is improved, so that the ionic conductivity of the composite solid electrolyte membrane is improved, and meanwhile, the mechanical strength of the composite solid electrolyte membrane 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 lithium ion battery. Background technique [0002] All-solid-state batteries replace the flammable electrolyte in traditional lithium-ion batteries with non-flammable solid electrolytes, fundamentally avoiding potential safety hazards. Secondly, the good mechanical properties of the solid electrolyte can effectively inhibit the growth of lithium dendrites in the negative electrode, greatly reducing the risk of short circuit caused by dendrite piercing, making it possible for metal lithium to be used as the negative electrode material of lithium-ion batteries, thereby effectively improving the performance of lithium-ion batteries. energy density. With many advantages such as high safety performance and long cycle life, all-solid-state lithium-ion batteries have gradually become a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M2300/0065Y02E60/10
Inventor 赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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