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

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

Active Publication Date: 2022-03-04
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 battery and preparation method thereof

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preparation example Construction

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

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

[0020] Step 2: Add lithium salt to the uniform 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 lithium salt accounts for 1%-20% of the total mass of the glue;

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

Embodiment 1

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

Embodiment 2

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

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Abstract

The invention discloses a composite binder for solid-state lithium batteries and a preparation method thereof. The composite binder is composed of a high molecular polymer, a lithium salt and an inorganic ceramic fast ion conductor. The preparation method is to dissolve the high molecular polymer with an organic solvent. compound, lithium salt and inorganic ceramic fast ion conductor, under certain temperature and stirring conditions, an organic-inorganic composite binder complexed with lithium salt and inorganic fast ion conductor is formed. The binder has strong cohesive force and adhesion, as well as high ionic conductivity, and is used for the preparation of positive and negative pole pieces of solid-state lithium batteries, which can reduce the internal resistance of the pole pieces and improve the rate performance of solid-state lithium batteries. and cycle life.

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 lithium batteries and a preparation method thereof. Background technique [0002] With the continuous development of social economy, people pay more and more attention to low-carbon and environmentally friendly new energy industries. Lithium batteries, especially solid-state lithium batteries, have become a hot spot in the development of new energy industries in recent years. Solid-state lithium batteries replace traditional liquid electrolytes with solid-state electrolytes, so compared with traditional lithium batteries, they have higher energy density, longer cycle life, and higher safety. However, due to the solid-solid interface contact inside the solid-state lithium battery, the loose contact leads to a large internal resistance of the battery, such as the interface between the electrode and the sol...

Claims

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Application Information

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Patent Type & Authority Patents(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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