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Multifunctional composite positive plate for secondary battery, preparation method and secondary battery

A composite positive electrode and multi-functional technology, applied in secondary batteries, battery electrodes, positive electrodes, etc., can solve problems such as single structure, achieve high power density, long cycle life, and enhanced functions

Pending Publication Date: 2020-06-19
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By designing the structure of the positive active material layer, the present invention gives full play to the functions of different positive active material components, overcomes the defects of single structure and short function of the positive active material layer in the prior art, and obtains safety and rate characteristics. , high and low temperature characteristics, service life, cycle life and other comprehensive multifunctional composite positive electrode sheet and secondary battery, thus completing the present invention

Method used

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  • Multifunctional composite positive plate for secondary battery, preparation method and secondary battery
  • Multifunctional composite positive plate for secondary battery, preparation method and secondary battery
  • Multifunctional composite positive plate for secondary battery, preparation method and secondary battery

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preparation example Construction

[0078] The invention provides a method for preparing a multifunctional composite positive electrode sheet, the method comprising: preparing a positive electrode active material layer on a positive electrode current collector layer,

[0079] Preferably, the positive electrode active material layer is made of the positive electrode active material assembly by spray coating, interval coating (such as equal interval extrusion coating), sputtering with a mask structure (reticle sputtering), roll pressing, pulse laser It is formed by one or more methods of deposition, chemical vapor deposition, atomic layer deposition, electrochemical deposition, 3D printing, etc.

[0080] According to a preferred embodiment of the present invention, the preparation process of the multifunctional composite positive electrode sheet: the positive electrode active material, the conductive additive and the binder are mixed to prepare a slurry, the slurry is coated on the positive electrode current collec...

Embodiment 1

[0089]A multifunctional composite positive electrode sheet, comprising a positive electrode current collector layer 101 and a positive electrode active material layer, wherein the positive electrode current collector layer 101 is an aluminum foil, and the positive electrode active material layer includes a first positive electrode active material assembly 1021 and a second positive electrode active material assembly 1022 , the positive electrode active material of the first positive electrode active material assembly 1021 is lithium iron phosphate, the mass fraction is 93%, the binder is polyvinylidene fluoride, the mass fraction is 3%, the conductive additive is carbon black, the mass fraction is 4%, The positive electrode active material of the second positive electrode active material assembly 1022 is lithium cobaltate, with a mass fraction of 97%, the binder is polyvinylidene fluoride, with a mass fraction of 1.5%, and the conductive additive is carbon black, with a mass fra...

Embodiment 2

[0094] A multifunctional composite positive electrode sheet, comprising a positive electrode current collector layer 101 and a positive electrode active material layer, wherein the positive electrode current collector layer 101 is an aluminum foil, the positive electrode active material layer includes n positive electrode active material components, and the positive electrode active material in the positive electrode active material component The materials are the same, the positive electrode active material is lithium iron phosphate, but the mass fraction of lithium iron phosphate in each positive electrode active material component is different, and the n positive electrode active material components are distributed in a two-dimensional layered structure, from the positive electrode current collector layer 101 to the diaphragm direction The first positive electrode active material assembly 1021 (the mass fraction of lithium iron phosphate is 97%, the binder is polyvinylidene f...

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Abstract

The invention discloses a multifunctional composite positive plate and a preparation method thereof, and a secondary battery. The multifunctional composite positive plate comprises a positive currentcollector layer and a positive active material layer. The positive electrode active material layer comprises a plurality of positive electrode active material assemblies. The positive electrode activematerial assemblies are prepared from a positive electrode active material, a binder and a conductive additive. The plurality of positive electrode active material assemblies are distributed betweenthe positive electrode current collector layer and the diaphragm in a two-dimensional laminated structure or a three-dimensional laminated structure, and the plurality of positive electrode active material assemblies have different physical properties or different chemical compositions. According to the invention, the positive electrode active material layer is subjected to structural design, themultifunctional composite positive plate and the secondary battery give full play to the functions of different positive active material assemblies, overcome the defects of single positive active material layer structure and short function in the prior art, and give consideration to the comprehensive excellent performances such as safety, rate capability, high and low temperature characteristics,service life, cycle life and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices and new energy materials, and relates to a multifunctional composite positive electrode sheet for a secondary battery, a preparation method and a secondary battery. Background technique [0002] The current commercial secondary batteries, taking lithium-ion secondary batteries as an example, are mainly composed of positive electrode sheets, separators, and negative electrode sheets combined by physical means such as winding and lamination, and then packed into packaging materials and injected with working electrolytes. This method of operation is convenient, convenient for industrialization and large-scale automated production, and is currently the mainstream method of making lithium-ion batteries. [0003] In recent years, with the rapid development of new energy vehicles, large-scale energy storage, national defense security, aerospace and other fields around the world, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/36H01M4/505H01M4/525H01M4/58H01M4/1391H01M4/1397H01M10/0525
CPCH01M4/366H01M4/5825H01M4/525H01M4/505H01M4/131H01M4/136H01M4/1391H01M4/1397H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 凌仕刚李山山朱卫泉苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD