A kind of double-layer solid electrolyte film for lithium battery and preparation method thereof

A technology for solid electrolytes and lithium batteries, applied in solid electrolytes, lithium batteries, non-aqueous electrolytes, etc., can solve problems such as poor chemical properties and poor interface compatibility, achieve improved dispersion, high binding force, and inhibit the growth of lithium dendrites Effect

Active Publication Date: 2021-12-28
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problems of the poor electrochemical performance of the composite electrolyte and the poor interface compatibility between the electrolyte and the negative electrode in the existing all-solid lithium battery, and provides a double-layer solid electrolyte film for lithium batteries and its preparation method

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  • A kind of double-layer solid electrolyte film for lithium battery and preparation method thereof
  • A kind of double-layer solid electrolyte film for lithium battery and preparation method thereof
  • A kind of double-layer solid electrolyte film for lithium battery and preparation method thereof

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Embodiment 1

[0055] Embodiment 1: The preparation method of the double-layer solid electrolyte film that is used for lithium battery of the present embodiment, carries out according to the following steps:

[0056] 1. Preparation of surface treatment agent-coated lithium ion conductor filler: 0.6g of aluminum doped lithium titanium phosphate (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , LATP) was dispersed in 5 mL of deionized water, and 1 g of polymethylmethacrylate (PMMA) dispersion solution was added, and stirred at room temperature for 12 hours to form a dispersion; the resulting dispersion was centrifuged, washed, and ultrasonically dispersed in sequence, and repeated Three times; the upper solvent after the third centrifugation was sucked out, the remaining solid phase at the bottom was taken out, and vacuum-dried at 80°C for 12 hours; polymethyl methacrylate-coated aluminum-doped lithium titanium phosphate (LATP@PMMA) was obtained; The dispersion solution of methyl methacrylate is a product...

Embodiment 2

[0080] Embodiment 2: The preparation method of the double-layer solid electrolyte film for lithium battery of the present embodiment is carried out according to the following steps:

[0081] 1. Preparation of surface treatment agent-coated lithium ion conductor filler: Disperse 0.6g of aluminum-doped lithium titanium phosphate in 5mL of deionized water, add 1g of polymethyl methacrylate dispersion solution, and stir at room temperature for 12 hours to form a dispersion; The resulting dispersion was centrifuged, washed, and ultrasonically dispersed in sequence, and repeated three times; the solvent in the upper layer after the third centrifugation was sucked out, and the remaining solid phase at the bottom was taken out, and vacuum-dried at 80°C for 12 hours; polymethyl methacrylate-coated Aluminum-doped lithium titanium phosphate; the dispersion solution of polymethyl methacrylate is a product of Soken Chemical&Enginerring Co., Ltd., the product model is MX-1000F, the solvent i...

Embodiment 3

[0088] Embodiment 3: The preparation method of the double-layer solid electrolyte film for lithium battery of the present embodiment is carried out according to the following steps:

[0089] 1. Preparation of surface treatment agent-coated lithium ion conductor filler: disperse 0.6g of aluminum-doped lithium titanium phosphate in 5mL of deionized water, add 1g of polymethyl methacrylate dispersion solution, and stir at room temperature for 12 hours to form a homogeneous solution ; Centrifuge, wash, and ultrasonically disperse the obtained solution in sequence, and repeat three times; suck out the upper solvent after the third centrifugation, take out the remaining solid phase at the bottom, and dry it in vacuum at 80°C for 12 hours to obtain a polymethyl methacrylate coating type Germanium-doped lithium titanium phosphate;

[0090] 2. Preparation of composite solid electrolyte solution: Disperse 0.6g of polymethyl methacrylate-coated aluminum-doped lithium titanium phosphate i...

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Abstract

A double-layer solid electrolyte film for lithium batteries and a preparation method thereof, relating to a solid state electrolyte film and a preparation method thereof. It is to solve the technical problems of poor electrochemical performance of the composite electrolyte and poor interface compatibility between the electrolyte and the negative electrode in the existing all-solid-state lithium battery. The electrolyte film of the invention is composed of a composite solid electrolyte layer and a flexible polymer solid electrolyte layer. Preparation method: Coat the oxide-based lithium ion conductor filler with a surface treatment agent, and then prepare a composite solid electrolyte solution with a polymer and a lithium salt; prepare a flexible polymer solid electrolyte solution with a polymer and a lithium salt; The electrolyte solution is scraped on the flat substrate, and then the flexible polymer solid electrolyte solution is scraped and dried to obtain a double-layer solid electrolyte film. The assembled all-solid-state lithium battery has a capacity retention rate of 90.0% within 3.0-4.2V voltage and 130 cycles at 0.5C at room temperature, and can be used in the field of lithium batteries.

Description

technical field [0001] The invention belongs to the field of all-solid-state lithium batteries, and in particular relates to a double-layer solid-state electrolyte film and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles and mobile devices, lithium-ion batteries with excellent charge and discharge performance have become a research hotspot in the field of energy storage. However, the current commercial lithium-ion batteries have a series of safety hazards due to the use of flammable and explosive organic electrolytes. Using solid electrolyte instead of organic electrolyte is an effective solution to improve the safety performance of batteries. The solid-state electrolyte has a wider electrochemical window, which can be adapted to high-voltage positive electrodes and metal lithium negative electrodes. Therefore, solid-state electrolytes can be used to produce all-solid-state lithium batteries with higher energy den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/056H01M10/052H01M2300/0065Y02E60/10
Inventor 熊岳平金英敏李根周炫光张勇雷蕾
Owner HARBIN INST OF TECH
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