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Composite electrolyte film, preparation method thereof and application of composite electrolyte film in solid-state lithium battery

A technology of composite electrolyte and gel electrolyte, which is applied in the field of composite electrolyte film and its preparation, can solve the problems of poor chemical properties and mechanical properties, and achieve the effects of ensuring uniform dispersion, increasing interface contact area, and improving structural uniformity

Pending Publication Date: 2022-05-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of poor electrochemical and mechanical properties of polymer electrolytes in existing solid-state lithium batteries, and provides a composite electrolyte film, its preparation method and its application in solid-state lithium batteries

Method used

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  • Composite electrolyte film, preparation method thereof and application of composite electrolyte film in solid-state lithium battery
  • Composite electrolyte film, preparation method thereof and application of composite electrolyte film in solid-state lithium battery
  • Composite electrolyte film, preparation method thereof and application of composite electrolyte film in solid-state lithium battery

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Embodiment 1

[0057] Embodiment 1: The preparation method of the composite electrolyte film of the present embodiment is carried out according to the following steps:

[0058] 1. Preparation of surface treatment agent-coated lithium ion conductor filler: Mix 45mL of absolute ethanol, 2.5mL of deionized water and 1.25mL of glacial acetic acid evenly, stir for 3 hours to stabilize the pH value, and then add 5mL of surface treatment agent 3-aminopropyl base triethoxysilane, continue to stir for 5h to obtain a mixed solution; 1g of lithium ion conductor type filler aluminum doped titanium lithium phosphate (Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 , LATP) were dispersed in the mixed solution, and stirred at a temperature of 60°C for 10 hours to obtain a dispersion; the dispersion was centrifuged and washed in turn, and repeated three times; Vacuum drying at ℃ for 12 hours to obtain polysiloxane-coated aluminum-doped lithium titanium phosphate particles;

[0059] 2. Preparation of electrospinning sol...

Embodiment 2

[0102] Embodiment 2: The preparation method of the composite electrolyte film of the present embodiment is carried out according to the following steps:

[0103] 1. Preparation of surface treatment agent-coated lithium ion conductor filler: Mix 45mL of absolute ethanol, 2.5mL of deionized water and 1.25mL of glacial acetic acid evenly, stir for 3 hours to stabilize the pH value; add 5mL of surface treatment agent 3-aminopropyl Triethoxysilane, continue to stir for 5h; 1g of lithium ion conductor type filler aluminum doped titanium lithium phosphate (Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 , LATP) dispersed in the above solution, heated and stirred at 60°C for 10h to form a dispersion; centrifuged and washed the obtained dispersion in turn, and repeated three times; sucked out the upper solvent after the third centrifugation, and took out the remaining solid phase at the bottom , after vacuum drying at 60°C for 12 hours, polysiloxane-coated aluminum-doped lithium titanium phosphate ...

Embodiment 3

[0110] Embodiment 3: The preparation method of the composite electrolyte film of the present embodiment is carried out according to the following steps:

[0111] 1. Preparation of surface treatment agent-coated lithium ion conductor filler: Mix 45mL of absolute ethanol, 2.5mL of deionized water and 1.25mL of glacial acetic acid evenly, stir for 3 hours to stabilize the pH value; then add 5mL of surface treatment agent 3-aminopropyl base triethoxysilane, continue to stir for 5h; 1g of lithium ion conductor type filler aluminum doped lithium titanium phosphate (Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 , LATP) dispersed in the above solution, heated and stirred at 60°C for 10 hours to form a dispersion; centrifuged and washed the obtained dispersion in turn, and repeated three times; sucked out the upper solvent after the third centrifugation, and took out the remaining solid phase at the bottom After vacuum drying at 60°C for 12 hours, polysiloxane-coated aluminum-doped lithium titani...

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Abstract

The invention discloses a composite electrolyte film, a preparation method thereof and application of the composite electrolyte film in a solid-state lithium battery, and relates to an electrolyte film and a preparation method and application thereof. The invention aims to solve the technical problems of poor electrochemical performance and mechanical performance of the polymer electrolyte in the existing solid-state lithium battery. The composite electrolyte film is composed of a porous polymer fiber diaphragm and a filled gel electrolyte. The preparation method comprises the following steps: coating the lithium ion conductor type filler with the surface treating agent, mixing with the polymer to form an electrostatic spinning solution, and spinning to obtain the porous polymer fiber diaphragm; and blade-coating the porous fiber diaphragm with a gel electrolyte precursor solution formed by mixing a lithium salt, a polymer monomer, a plasticizer and an initiator, and heating and curing to obtain the composite electrolyte film. And assembling the positive electrode, the composite electrolyte film and the metal lithium negative electrode in a battery shell, and heating and curing to obtain the solid-state lithium battery. The capacity retention ratio of the battery after 200 cycles at 0.5 C at room temperature is 86.4-99.9%, and the battery can be used in the field of lithium batteries.

Description

technical field [0001] The invention belongs to the field of solid-state lithium batteries, and in particular relates to a composite electrolyte film and its preparation method and application. Background technique [0002] As the core component of solid-state lithium batteries, solid-state electrolytes are critical to improving the performance of lithium-ion batteries by properly designing the composition and structure of solid-state electrolytes. Polymer electrolytes have attracted extensive attention in the field of flexible electronic devices because of their strong flexibility, good interface adhesion with electrodes, and adaptability to roll-to-roll production processes. However, the low room temperature ionic conductivity, poor mechanical strength and electrochemical stability of polymer electrolytes still limit their practical applications. In addition, the lithium ion migration number of polymer electrolytes is usually low, and the resulting concentration polarizat...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M50/411H01M10/0525
CPCH01M10/0565H01M50/411H01M10/0525H01M2300/0082Y02E60/10
Inventor 熊岳平金英敏宗鑫张雪柏贾政刚
Owner HARBIN INST OF TECH
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