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Positive plate, preparation method of positive plate, solid-state lithium ion battery, semi-solid-state lithium ion battery and preparation method of semi-solid-state lithium ion battery

A lithium-ion battery and positive electrode technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, positive electrodes, etc., can solve the problems of decreased battery particle cohesion, decreased battery coulombic efficiency, low ionic conductivity, etc. Improve dynamics, increase the effect of transmission channels

Active Publication Date: 2021-10-22
远景动力技术(湖北)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing all-solid-state lithium batteries generally have the problem of large volume changes during cycling, which is likely to cause a decrease in the cohesion of particles inside the battery, damage to electrode materials, and lead to battery capacity attenuation
In addition, the interface problems of all-solid-state batteries still cannot be solved. For example, the contact area of ​​the solid-solid interface is small and the contact is poor. Battery Coulombic efficiency decreases

Method used

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  • Positive plate, preparation method of positive plate, solid-state lithium ion battery, semi-solid-state lithium ion battery and preparation method of semi-solid-state lithium ion battery
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  • Positive plate, preparation method of positive plate, solid-state lithium ion battery, semi-solid-state lithium ion battery and preparation method of semi-solid-state lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Embodiment 1, the preparation of positive electrode sheet

[0099] The preparation process of the positive electrode sheet is completely completed under the dew point condition of -70°C. Before the experimental operation, it is necessary to dewater the selenium disulfide, lithium nitrate, and materials to ensure that the water content of the materials is ≤10ppm.

[0100] The NCM622 material, Li 6 P.S. 5 Cl, PTFE powder, Super-P and selenium disulfide are mixed, and the mass fraction of NCM622 material is 70%, Li 6 P.S. 5 The mass fraction of Cl is 23%, the mass fraction of PTFE powder is 3%, the mass fraction of Super-P is 2%, and the mass fraction of selenium disulfide is 2%. Use a Waring 800s high-speed pulverizer to stir for 2 minutes, rest for 1 minute, and repeat this operation 15-20 times to obtain positive electrode slurry.

[0101] The obtained positive electrode slurry was repeatedly rolled using a vertical roller press, the rolling gap was gradually reduce...

Embodiment 2

[0102] Embodiment 2, the preparation of electrolyte layer

[0103] The preparation process is completely carried out in an argon environment glove box with water ≤ 0.1ppm, oxygen ≤ 0.1ppm, and carbon dioxide ≤ 0.1ppm. Before the experimental operation, it is necessary to remove 2,2'-dithiobipyridine and LiTFSI materials first. Water work, to ensure that the water content of the material is ≤10ppm;

[0104] (1) Preparation of sulfide skeleton layer

[0105] Lithium phosphorus sulfur chloride (Li 6 P.S. 5 Cl) Electrolyte materials, selenium disulfide with a mass fraction of 10% are mixed, and dimethyl carbonate is used as a solvent with a solid content of about 50-60%. Use a Thinky defoaming mixer to stir at 2000rmp for 10 minutes, and then 500rmp for defoaming and stirring for 5 minutes ;

[0106] The mixed sulfide electrolyte slurry is uniformly coated on the aluminum foil with a coating gap of 100 microns, and the coated material is vacuum-dried at room temperature to obt...

Embodiment 3

[0111] Embodiment 3, the preparation of semi-solid lithium ion battery

[0112] Liquid electrolyte configuration:

[0113] Lithium nitrate was dissolved in PyR14TFSI ionic liquid to configure a 2mol / L lithium nitrate solution.

[0114] Lithium-ion battery assembly:

[0115] The positive electrode sheet prepared in Example 1, the electrolyte layer prepared in Example 2, and the lithium metal negative electrode sheet (lithium-copper composite strip, lithium foil thickness 50 μm, copper foil thickness 10 μm) were welded on the positive electrode sheet and the negative electrode sheet, The negative plate is welded with nickel-copper lugs, and the positive plate is welded with aluminum lugs, and then the upper part is sealed with a side sealing machine, and the prepared liquid electrolyte is injected into one side, and the liquid electrolyte is added to the battery at a ratio of 1g / Ah. After the injection is completed Stand at room temperature for 48 hours, and finally use a pack...

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Abstract

The invention discloses a positive plate, a preparation method of the positive plate, a solid-state lithium ion battery, a semi-solid-state lithium ion battery and a preparation method of the semi-solid-state lithium ion battery. The positive plate comprises a current collector and a positive electrode slurry layer covering the current collector, and a plurality of holes are formed in the positive electrode slurry layer. The positive electrode slurry layer comprises a positive electrode active material, a sulfide electrolyte material and a binder. According to the positive plate, a thick electrode is adopted, the loading capacity of the positive electrode is increased, meanwhile, a porous structure is adopted, the surface area of the positive plate is increased, transmission channels of lithium ions are increased, and the transmission performance of the lithium ions is improved. The preparation method of the positive plate reduces the cost of a battery. According to the semi-solid lithium ion battery, a lithium ion transmission channel is added, and a liquid electrolyte is injected, so that good contact between the solid electrolyte and the active substance can be ensured, the lithium ion transmission distance is shortened the dynamic performance of the battery is improved, and the low-temperature capacity, the normal rate capability, the normal-temperature cycle life and the 45 DEG C high-temperature cycle performance of the battery are improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of lithium-ion batteries, and in particular to a positive electrode sheet, a preparation method thereof, a solid-state lithium-ion battery, a semi-solid lithium-ion battery and a preparation method thereof. Background technique [0002] As one of the most important electrochemical energy storage devices at present, lithium-ion batteries have gradually expanded their application scope from consumer electronics and electric tools to emerging fields such as new energy electric vehicles, electric ships, electric aircraft, and robots. These fields not only require lithium-ion batteries to have greater capacity, but also continuously put forward higher requirements for their energy density. However, increasing the energy density of batteries easily leads to a decrease in safety performance. The mainstream lithium-ion battery currently on the market is a liquid lithium-ion battery. After long-term ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565H01M4/13H01M4/139H01M2300/0085H01M2004/028Y02P70/50
Inventor 余乐王仁和其他发明人请求不公开姓名
Owner 远景动力技术(湖北)有限公司
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