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Positive pole piece modified by polymer film and preparation method of positive pole piece

A technology of polymer film and positive pole piece, which is applied in the field of all-solid-state batteries, can solve the problems of poor interface contact effect, high material grain boundary impedance, and high interface impedance, so as to prevent particle shedding, reduce interface polarization, and reduce interface impedance Effect

Pending Publication Date: 2022-03-22
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of solid electrolyte has poor mechanical properties, high grain boundary impedance of the material itself, poor interface contact with electrode materials, and high interface impedance, which greatly limits the application of this type of electrolyte.

Method used

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  • Positive pole piece modified by polymer film and preparation method of positive pole piece
  • Positive pole piece modified by polymer film and preparation method of positive pole piece
  • Positive pole piece modified by polymer film and preparation method of positive pole piece

Examples

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preparation example Construction

[0033] A method for preparing a positive electrode sheet modified by a polymer film, comprising the steps of:

[0034] 1) Mix 15-18 g of positive electrode material, 0.1-0.5 g of binder, and 0.1-0.5 g of conductive agent together, perform high-speed stirring and homogenization, filter the uniformly dispersed slurry and apply it to the electrode collector, and then Drying and cold pressing to obtain the primary pole piece, after the primary pole piece is cleaned by ultrasonic waves, the working electrode is obtained;

[0035] 2) Mix 0.1~3 g polymer monomer, 0.2~2.0 mol / L tetrabutylammonium hexafluorophosphate (TBAPF 6 ) 1~10mL, 0.01~2g lithium hexafluorophosphate, and 0.01~2 g electrolyte are added to the organic solvent, stirred evenly to form a mixed solution, and then added to the electrolytic cell, which is protected by an inert gas;

[0036]3) Ultrasonic pre-clean the working electrode obtained in step 1), one of gold, platinum, lead and titanium is used as the counter el...

Embodiment 1

[0052] A kind of preparation of the electropolymerization thin film modified positive pole piece, comprises following preparation steps:

[0053] 1) The high nickel LiNi 0.9 co 0.06 mn 0.04 Positive electrode material 16 g, binder PVDF: 0.33 g, conductive agent Super P: 0.25 g, high-speed stirring and homogenization for 5 min, the uniformly dispersed slurry was filtered and coated on the current collector, and then dried and cooled. Press to obtain a fresh positive pole piece, after ultrasonic cleaning for 1 min, it was used as a working electrode;

[0054] 2) Mix 10 ml 0.5 mg / mL aniline, 5 mL 1.0 mol / L tetrabutylammonium hexafluorophosphate (TBAPF 6 ), 0.01g lithium hexafluorophosphate, 0.01 g ammonium perchlorate were added to the volume ratio of acetonitrile and dichloromethane of 2:3, after stirring evenly, the mixture was added to the electrolytic cell, and high-purity N was introduced into the electrolytic cell 2 Protect;

[0055] 3) The positive electrode sheet (2×...

Embodiment 2

[0061] A kind of preparation of the electropolymerization thin film modified positive pole piece, comprises following preparation steps:

[0062] 1) The high nickel LiNi 0.9 co 0.06 mn 0.04 Positive electrode material 16 g, binder PVDF: 0.33 g, conductive agent Super P: 0.25 g, high-speed stirring and homogenization for 5 min, the uniformly dispersed slurry was filtered and coated on the current collector, and then dried and cooled. Press to obtain a fresh positive pole piece, after ultrasonic cleaning for 1 min, it was used as a working electrode;

[0063] 2) Mix 10 ml 0.5 mg / mL aniline, 5 mL 1.0 mol / L tetrabutylammonium hexafluorophosphate (TBAPF 6 ) 0.01g of lithium hexafluorophosphate, 0.01g was added to the volume ratio of acetonitrile and dichloromethane of 2:3, after stirring evenly, the mixed solution was added to the electrolytic cell, and high-purity N was introduced into the electrolytic cell 2 Protect;

[0064] 3) The positive electrode sheet (2×2 cm) whose su...

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Abstract

The invention provides a positive pole piece modified by an electro-polymerization polymer film and a preparation method of an all-solid-state battery of the positive pole piece. The surface of the positive pole piece is modified with a layer of electro-polymerization polymer film by adopting an electro-polymerization method, the electro-polymerization polymer film prepared by the method is internally doped with electrolyte, the ionic conductivity is high, and the polymer film has a certain respiration effect, so that stress generated when a positive pole material is in contact with solid electrolyte can be relieved, and an interface is stable; and the advantages of the organic liquid electrolyte and the solid electrolyte are integrated, and the cycle performance of the solid-state battery prepared by the method is excellent.

Description

technical field [0001] The invention relates to the field of all-solid-state batteries, in particular to a polymer film-modified positive pole piece and a preparation method thereof. Background technique [0002] All-solid-state batteries are considered to be the most promising next-generation battery technology due to their excellent safety, high energy density, and high power density. However, the ionic conductivity of the electrolyte in solid-state batteries is low. The interface binding force is poor, and there is great resistance between solid-phase interfaces, which greatly limit the application of solid-state batteries. How to solve these problems has become the focus of many research institutions. [0003] The solid-state electrolytes of all-solid-state batteries are divided into inorganic oxide solid electrolytes, polymer-based solid electrolytes, and inorganic sulfide-based solid electrolytes. Among them, the sulfide-based solid electrolyte (Li 7 P 3 S 11 ) has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/1391H01M4/04H01M10/0525
CPCH01M4/628H01M4/624H01M4/131H01M4/1391H01M4/0452H01M10/0525H01M2004/028Y02E60/10
Inventor 吉长印吕菲徐宁陈志宇张玉伟吴孟涛陈要忠
Owner TIANJIN B&M SCI & TECH
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