Composite binder for solid-state lithium batteries and preparation method thereof

A binder, solid lithium technology, applied in the field of electric energy, can solve the problems of poor adhesion, weak adhesion, easy falling off of battery materials, etc., to reduce internal resistance, improve rate performance and cycle life, adhesion ability stable effect

Active Publication Date: 2019-06-07
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PEO cannot be applied to high-voltage positive electrode materials, such as high-nickel ternary materials, etc., and can only be used in lithium iron phosphate batteries, so it is unfavorable for the development of solid-state lithium batteries with high specific energy
In addition, the adhesive force of PEO as a binder is weak, and the adhesion to the current collector is also poor, which causes the battery material to fall off easily during the battery preparation process. Therefore, PEO as a binder is not an ideal solution for solid-state lithium battery binders. Program

Method used

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  • Composite binder for solid-state lithium batteries and preparation method thereof

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preparation example Construction

[0018] The preparation method of the composite binder for solid-state lithium batteries of the present invention comprises the following steps:

[0019] Step 1: Dissolve the high molecular polymer in the organic solvent, and completely dissolve the polymer in the solvent under the condition of heating and stirring. The mass of the high molecular polymer accounts for 1%-20% of the total mass of the glue. The heating temperature range 20℃-80℃;

[0020] Step 2: Add lithium salt to the homogeneous solution formed in step 1, and stir for 0.5h-3h, so that the lithium salt is completely dissolved in the solution, and the mass of the lithium salt accounts for 1%-20% of the total mass of the glue solution;

[0021] Step 3: Add the inorganic ceramic fast ion conductor on the basis of step 3, and use stirring or ultrasonic dispersion method to uniformly disperse the inorganic ceramic particles in the glue solution. The mass of the inorganic ceramic fast ion conductor accounts for 0.5%-10...

Embodiment 1

[0030] Dissolve 0.2g PVDF in 8ml NMP, heat at 50℃ for 1h under stirring condition to dissolve PVDF completely; then add 0.15g LiPF to the solution 6 , stirring for 0.5h to make LiPF 6 Completely dissolved; then add 0.08g LLZO, disperse LLZO uniformly in the solution under ultrasonic conditions, heat the mixed solution at 50°C for 6h under ultrasonic conditions, and after the color of the solution becomes dark red, stop heating and ultrasonication.

Embodiment 2

[0032] Dissolve 0.3 g of PVDF-HFP in 10 ml of DMF, and heat at 60 °C for 0.5 h under stirring conditions to completely dissolve PVDF-HFP; then add 0.3 g of LiTFSI to the solution, heat and stir for 0.5 h to completely dissolve the lithium salt; Add 0.2 g of LAGP to the mixed solution under mechanical stirring, and after fully stirring, heat the mixed solution at 60°C for 12 h under stirring, and stop heating and stirring after the color of the mixed solution changes to dark brown.

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Abstract

The invention discloses a composite binder for solid-state lithium batteries and a preparation method thereof. The compound binder consists of a high-molecular polymer, lithium salt and an inorganic ceramic fast ion conductor; and the preparation method is to use an organic solvent to dissolve the high-molecular polymer, the lithium salt and the inorganic ceramic fast ion conductor, and generate the organic-inorganic composite binder complexed with the lithium salt and the inorganic fast ion conductor under a certain temperature and stirring. The binder has strong cohesive and adhesive force and high ionic conductivity, and can be used for the preparation of positive and negative pole pieces of solid-state lithium batteries, so that the internal resistance of the pole pieces can be reduced, and the rate performance and cycle life of the solid-state lithium batteries can be enhanced.

Description

technical field [0001] The invention belongs to the field of electric energy, in particular to the field of new energy lithium batteries, in particular to a binder for solid-state lithium batteries and a preparation method thereof. Background technique [0002] With the continuous development of the social economy, the low-carbon and environmentally friendly new energy industry has attracted more and more attention. Lithium batteries, especially solid-state lithium batteries, have become a hot spot in the development of the new energy industry in recent years. Solid-state lithium batteries replace traditional liquid electrolytes with solid-state electrolytes, so they have the advantages of higher energy density, longer cycle life, and higher safety than traditional lithium batteries. However, due to the solid-solid interface contact inside the solid-state lithium battery, the contact is not tight, resulting in a large internal resistance of the battery, such as the interface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052C09J127/16C09J11/04
CPCY02E60/10
Inventor 王磊桑林丁飞刘兴江姜明序林君毅
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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