Alkali metal negative electrode-electrolyte integrated material, preparation method thereof and application of alkali metal negative electrode-electrolyte integrated material in assembling solid-state battery in air

A solid-state battery and electrolyte technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, electrolyte layer coatings, etc., can solve problems affecting the electrochemical performance of solid-state batteries, large electrode-electrolyte interface impedance, etc. Improve the interface impedance problem and improve the effect of cycle stability

Pending Publication Date: 2022-03-29
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the all-solid-state battery uses alkali metal as the negative electrode material, the latter is very easy to react with air, water, etc. in the normal environment of non-vacuum atmosphere and non-inert atmosphere. The high requirements and cost of the process and technology have brought great challenges to the mass production and application of alkali metal solid-state batteries
In addition, compared with traditional liquid batteries, solid-state batteries have a larger electrode-electrolyte interface impedance, which seriously affects the electrochemical performance of solid-state batteries.

Method used

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  • Alkali metal negative electrode-electrolyte integrated material, preparation method thereof and application of alkali metal negative electrode-electrolyte integrated material in assembling solid-state battery in air
  • Alkali metal negative electrode-electrolyte integrated material, preparation method thereof and application of alkali metal negative electrode-electrolyte integrated material in assembling solid-state battery in air
  • Alkali metal negative electrode-electrolyte integrated material, preparation method thereof and application of alkali metal negative electrode-electrolyte integrated material in assembling solid-state battery in air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing a lithium metal negative electrode-electrolyte integrated material, comprising the following steps:

[0044] (1) Weigh 0.2g of dried lithium bistrifluoromethanesulfonimide (LiTFSI), dissolve it in 9.5g of tetrahydrofuran and stir at 25°C for 12h, and obtain a uniform electrolyte salt solution after the electrolyte salt is completely dissolved; weigh 0.5 g of dried polyvinylidene chloride (PVDC) powder was added to the prepared homogeneous electrolyte salt solution and stirred at 25° C. for 12 hours to form a PVDC-LiTFSI electrolyte slurry.

[0045] (2) Transfer the homogeneously dissolved or dispersed electrolyte slurry described in step (1) to an argon atmosphere with a water value and an oxygen value of ≤0.1ppm. in 80 μL cm -2 The coating amount of the electrolyte slurry described in the step (1) is coated on the metal lithium sheet surface, such as figure 1 Coating was carried out according to the coating process shown, and after uniform coat...

Embodiment 2

[0059] A method for preparing a lithium metal negative electrode-electrolyte integrated material, comprising the following steps:

[0060] (1) Weigh 0.4g of dried LiTFSI, dissolve it in 9g of tetrahydrofuran and stir at 25°C for 12h, and obtain a uniform electrolyte salt solution after the electrolyte salt is completely dissolved; weigh 0.9g of dried PVDC powder and 0.10g of dried PEO powder (Mw=600,000) was added to the prepared homogeneous electrolyte salt solution and stirred at 25°C for 12 hours to form PVDC-PEO-LiTFSI electrolyte slurry.

[0061] (2) Transfer the homogeneously dissolved or dispersed electrolyte slurry described in step (1) to an argon atmosphere with a water value and an oxygen value of ≤0.1ppm. in 90 μL cm -2 The coating amount of the electrolyte slurry described in the step (1) is coated on the metal lithium sheet surface, such as figure 1 Coating was carried out according to the coating process shown, and after uniform coating, tetrahydrofuran was vo...

Embodiment 3

[0064] A method for preparing a lithium metal negative electrode-electrolyte integrated material, comprising the following steps:

[0065] (1) Weigh 0.4g of dried LiTFSI, dissolve it in 9g of tetrahydrofuran and stir at 25°C for 12h, and obtain a uniform electrolyte salt solution after the electrolyte salt is completely dissolved; weigh 0.9g of dried PVDC powder and 0.10g of dried PVDF powder was added to the prepared homogeneous electrolyte salt solution and stirred at 25°C for 12 hours to form PVDC-PVDF-LiTFSI electrolyte slurry.

[0066] (2) Transfer the homogeneously dissolved or dispersed electrolyte slurry described in step (1) to an argon atmosphere with a water value and an oxygen value of ≤0.1ppm. in 90 μL cm -2 The coating amount of the electrolyte slurry described in the step (1) is coated on the metal lithium sheet surface, such as figure 1 Coating was carried out according to the coating process shown, and after uniform coating, tetrahydrofuran was volatilized a...

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Abstract

The invention belongs to the technical field of solid-state batteries, and discloses an alkali metal negative electrode-electrolyte integrated material and application of a preparation method of the alkali metal negative electrode-electrolyte integrated material to assembly of a solid-state battery in air. The method comprises the following steps: dissolving or dispersing an electrolyte component with an alkali metal protection function in an organic solvent, stirring to form electrolyte slurry, coating the slurry on the surface of an alkali metal material in a protective atmosphere, and volatilizing the organic solvent to obtain the alkali metal negative electrode-electrolyte integrated material. The process is simple and convenient, the operability is high, the coating area and thickness of the material are easy to control, and mass production is easy. The material can effectively block air and water so as to effectively protect an alkali metal negative electrode, the material can be used for assembling an alkali metal solid-state battery in an air environment, the assembling difficulty and environmental requirements can be reduced, and the production cost is further reduced. The material can also effectively reduce the interface contact resistance of an alkali metal negative electrode and an electrolyte, can inhibit the generation of alkali metal dendritic crystals, and improves the cycling stability of the prepared solid-state battery.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and in particular relates to the application of an alkali metal negative electrode-electrolyte integrated material and a preparation method thereof for assembling solid-state batteries in air. Background technique [0002] How to establish a clean and efficient energy storage system while developing clean energy, and then efficiently store and utilize energy has become a top priority. The continuous development of modern consumer electronics, electric vehicles, and stationary grid energy storage places higher requirements on the energy density, safety, reliability, and service life of energy storage devices. Alkali metal (lithium, sodium, potassium) ion secondary batteries are currently widely used energy storage devices due to their advantages such as high energy density, long life, environmental protection, and low self-discharge rate. Alkali metal secondary batteries with alkali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/134H01M10/052H01M10/054H01M10/056H01M10/058
CPCH01M4/0407H01M4/134H01M10/052H01M10/054H01M10/058H01M10/056H01M2300/0065Y02E60/10Y02P70/50
Inventor 梁业如郑衍森张伟财刘应亮徐悦华
Owner SOUTH CHINA AGRI UNIV
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