Multifunctional adsorption coating layer and diaphragm adopting same

A multi-functional, coating technology, applied in coatings, conjugated diene coatings, electrical components, etc., can solve problems such as increasing the dissolution of metal ions, affecting the stability of SEI films, battery gas production and performance attenuation, etc., to achieve Increased holding and adsorption capacity, good chemical stability, effect of reducing stability

Inactive Publication Date: 2018-10-12
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dissolution of metal ions in ternary materials has always been a problem under high voltage, and the increase in nickel content will increase the dissolution of metal ions, and the dissolved metal ions will be deposited on the negative electrode, affecting the stability of the SEI film, causing battery gas production and performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Metal salt (mass ratio of barium titanate and aluminum phosphate 1:1) 45.25g, wherein the BET specific surface area of ​​barium titanate is 16m 2 / g, the BET specific surface area of ​​aluminum phosphate is 20m 2 / g, dispersant is 2% sodium carboxymethyl cellulose solution 37.5g, binder styrene-butadiene rubber emulsion (solid content 50%) 8g, 34.25g deionized water is solvent, design solid content 40%, prepare after mixing Apply the slurry. The slurry was coated on the surface of the PP substrate by means of micro-gravure coating, and after drying, a multifunctional adsorption coating and a coated separator were formed, with a coating thickness of 4 μm.

Embodiment 2

[0024] Metal salt (mass ratio of barium titanate and aluminum phosphate 1:1) 45.25g, wherein the BET specific surface area of ​​barium titanate is 16m 2 / g, the BET specific surface area of ​​aluminum phosphate is 20m 2 / g, dispersant is 2% sodium carboxymethyl cellulose solution 37.5g, binder acrylate emulsion (solid content 50%) 8g, 34.25g deionized water is solvent, design solid content 40%, prepare coating after mixing Cover slurry. The slurry was coated on the surface of the PE substrate by means of micro-gravure coating, and after drying, a multifunctional adsorption coating and a coated separator were formed, with a coating thickness of 4 μm.

Embodiment 3

[0026] Metal salt (mass ratio of barium titanate and aluminum phosphate 1:1) 31.675g, wherein the BET specific surface area of ​​barium titanate is 16m 2 / g, the BET specific surface area of ​​aluminum phosphate is 20m 2 / g, nano zirconia 13.575g, the particle diameter D90 of nano zirconia is less than 200nm and average particle diameter is 50nm, dispersant is 2% sodium carboxymethyl cellulose solution 37.5g, binder styrene-butadiene rubber emulsion (solid content 50%) 8g, 52.1g deionized water as solvent, design solid content 35%, prepare coating slurry after mixing. The slurry was coated on the surface of the PP substrate by means of micro-gravure coating, and after drying, a multifunctional adsorption coating and a coated separator were formed, with a coating thickness of 3 μm.

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Abstract

The invention discloses a multifunctional adsorption coating layer and a diaphragm adopting the same, and relates to the multifunctional coating layer prepared from an adsorbing material; the adsorbing material in the coating layer mainly is metal salt or a mixture of metal salt and other inorganic metal oxide; the BET specific surface area of metal salt is higher than 15m<2>/g; the adsorbing material is mixed with a solvent, a binder and a dispersing agent to prepare coating paste to coat the surface of the diaphragm to form the coating layer with an adsorption function; and after the diaphragm coated with the coating layer on the surface is assembled into a battery, organic gas and inorganic gas generated by a secondary reaction in the shelving and using processes of the formed battery,and inorganic metal ions dissolved from a ternary positive electrode material are adsorbed, so that battery expansion and performance degradation are suppressed to a certain degree.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a multifunctional adsorption coating and a diaphragm using the coating. Background technique [0002] Lithium-ion batteries have high energy density, especially power batteries. Ensuring battery safety is the key to battery production and application. After the lithium-ion battery is packaged, gas production and metal ion dissolution and deposition during storage and use are one of the main factors affecting battery safety and performance. [0003] The trace moisture contained in the electrolyte itself and the dried cell is gradually released during battery storage and use to cause side reactions. The HF generated by the reaction of water and electrolyte lithium hexafluorophosphate will not only corrode the aluminum foil, but also catalyze the occurrence of side reactions in the battery. Cause battery gas production, consume lithium ions, and affect battery safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525C09D109/06C09D133/04C09D127/16C09D7/61H01M50/431H01M50/449
CPCH01M10/0525C09D109/06C09D127/16C09D133/04C09D7/61C08K2003/327H01M50/431H01M50/449C08L1/286C08K3/24C08K3/32Y02E60/10
Inventor 贾海王海文怀永建宋文锋
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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