Electrode plate and preparation method and application thereof

An electrode pole piece and pole piece technology, which is applied in the field of electrode pole piece and its preparation, can solve the problems of difficulty in obtaining uniformly coated electrolyte samples, battery performance decline, large interface resistance, etc., and achieve excellent electrochemical performance and reduce interface resistance. resistance, the effect of reducing the internal resistance of the battery

Inactive Publication Date: 2020-12-29
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although solid-state batteries have significant advantages in safety and energy density, their development still faces some problems. In an all-solid-state system, because the solid-state electrolyte and electrode materials are in solid-solid contact, the interface resistance is large, resulting in a sharp drop in battery performance.
[0003] In order to alleviate the above problems, atomic layer deposition (ALD) is currently used to prepare modified so...

Method used

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  • Electrode plate and preparation method and application thereof

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preparation example Construction

[0042] The invention provides a method for preparing electrode pole pieces, such as figure 1 shown, including the following steps:

[0043] Electrode material pole piece preparation: in parts by weight, 90-96 parts of electrode material, 0.1-5.0 parts of conductive agent, 1.0-4.0 parts of binder, and 1.0-4.0 parts of pore-forming agent are dissolved in the dispersant to obtain Slurry with a solid content of 40-70%, after the slurry is coated on the surface of the current collector, the coating amount is 1-100mg / cm 2 , drying at a temperature of 60-130°C for 0.5-2 h to obtain electrode material pole pieces;

[0044] Preparation of electrolyte solution: 40-55 g of solid electrolyte is subjected to mechanical wet ball milling to obtain electrolyte powder. The medium of wet ball milling is acetonitrile or absolute ethanol, and the mass ratio of solid electrolyte, balls and acetonitrile or absolute ethanol is 1:( 0.8-1.5): (0.8-1.2), the ball milling speed is 100-1000rpm, the bal...

Embodiment 1

[0058] A method for preparing an electrode pole piece, comprising the following steps:

[0059] S1, preparation of electrode material pole piece, 95g lithium cobaltate material, 2.0g conductive agent carbon black, 2.0g binder polyvinylidene fluoride, 90g dispersant N-methylpyrrolidone and 10g pore-forming agent oxalic acid were stirred to obtain a solid A slurry with a content of 55%, and then the slurry is coated on the surface of the current collector aluminum foil, and the coating amount is 30 mg / cm 2 , dried at 115°C for 1 h to obtain electrode material pole pieces, wherein the electrode material is LiCoO 2 ;

[0060] S2, preparation of electrolyte solution: 40g sulfide solid electrolyte amorphous Li 2 S-P 2 S 5 Perform mechanical wet ball milling to obtain electrolyte powder, dissolve the ball-milled electrolyte powder in an organic solvent-absolute ethanol to obtain an electrolyte solution, and stir evenly with a magnetic force to obtain an electrolyte solution. The ...

Embodiment 2

[0063] A preparation method of an electrode pole piece is carried out according to the method in Example 1, the difference is that

[0064] S1, preparation of electrode material pole pieces, 90g positive electrode material LiNi 0.5 co 0.2 mn 0.3 o 2 , 1.0g conductive agent single-walled carbon nanotubes, 4.0g binder polyvinylidene fluoride, 51.2g N-methylpyrrolidone dispersant and 5 g pore-forming agent-citric acid were stirred to prepare a slurry with a solid content of 66% , and then apply the slurry on the surface of the current collector aluminum foil, the coating amount is 7mg / cm 2 , dried under vacuum at 105°C for 2 h to obtain pole pieces of electrode materials;

[0065] S2, preparation of electrolyte solution: 50g NASICON type solid electrolyte Li Zr 2 (PO 4 ) 3 Carry out mechanical wet ball milling to obtain electrolyte powder, the electrolyte powder after ball milling is dissolved in organic solvent ethanol to obtain electrolyte solution, stir evenly, obtain e...

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Abstract

The invention discloses an electrode plate as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an electrode material plate: stirring an electrode material, a conductive agent, an adhesive, a dispersing agent and a pore-forming agent to obtain slurry, coating the surface of a current collector with the slurry, and conducting drying to obtain the electrode material plate; preparing an electrolyte solution: performing mechanical ball milling on the solid electrolyte to obtain electrolyte powder, and dissolving the electrolyte powder in an organic solvent to obtain the electrolyte solution; preparing the electrode plate:soaking the electrode material plate in the electrolyte solution, then conducting heating, drying and tabletting under the vacuum condition to obtain the electrode plate. The electrode plate of the solid-state lithium ion battery is prepared through the preparation method. The prepared electrode plate is applied to any one of a traditional liquid lithium battery, a polymer lithium battery, a mixed solid-liquid electrolyte lithium storage battery and a solid-state battery. The preparation method has theadvantages that the preparation process is low in cost, large-scale production is easy, and the prepared electrode plate has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, more specifically, it relates to an electrode pole piece and its preparation method and application. Background technique [0002] Due to the advantages of high energy density, high working voltage, and no memory effect, lithium-ion batteries have been rapidly and widely used in daily portable electronic products, power batteries, and energy storage systems. Traditional lithium-ion batteries use organic electrolyte as the carrier of lithium ions, but when the temperature rises, a series of side reactions occur between the electrolyte and the materials in the battery system, which significantly increases the internal resistance of the battery and is accompanied by gas production, etc. Phenomenon, a serious threat to the safe use of the battery. In order to solve the above problems of traditional lithium-ion batteries, solid-state electrolytes are usually used as lithium-ion transpor...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/13H01M10/0525H01M10/0562H01M10/0565H01M10/42
CPCH01M4/13H01M4/139H01M10/0525H01M10/0562H01M10/0565H01M10/4235Y02E60/10
Inventor 许晓雄张永龙魏引利陈董亮吴云峰丁超徐礼虎
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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