Multifunctional composite negative plate, preparation method and secondary battery

A secondary battery and negative electrode technology, which is applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of single structure and short function board, and achieve high power density, enhanced function, and enhanced bonding force effect

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

Method used

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  • Multifunctional composite negative plate, preparation method and secondary battery
  • Multifunctional composite negative plate, preparation method and secondary battery
  • Multifunctional composite negative plate, preparation method and secondary battery

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preparation example Construction

[0084] The invention provides a method for preparing a multifunctional composite negative electrode sheet, the method comprising: preparing a negative electrode active material layer on a negative electrode current collector layer,

[0085] Preferably, the negative electrode active material layer is made of the negative electrode active material assembly by spray coating, interval coating (equal interval extrusion coating), sputtering with a mask structure (reticle sputtering), pulse laser deposition, atomic layer deposition, Formed by one or several methods of electrochemical deposition, pulsed laser deposition, 3D printing, roll pressing, etc.

[0086] According to a preferred embodiment of the present invention, the preparation process of the multifunctional composite negative electrode sheet: the negative electrode material, the conductive additive and the binder are mixed to prepare a slurry, the slurry is coated on the negative electrode current collector layer, dried, an...

Embodiment 1

[0094] A multifunctional composite negative electrode sheet, comprising a negative electrode current collector layer 301 and a negative electrode active material layer 302, wherein the negative electrode current collector layer 301 is copper foil, and the negative electrode active material layer includes a first negative electrode active material assembly 3021 and a second negative electrode active material Component 3022, the active material of the first negative electrode active material component 3021 is graphite, 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 fraction of 1.5%; The active material of the second negative electrode active material assembly 3022 is a hard carbon negative electrode material 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 fraction of 1.5%...

Embodiment 2

[0099] A multifunctional composite negative electrode sheet, comprising a negative electrode current collector layer 301 and a negative electrode active material layer 302, wherein the negative electrode current collector layer 301 is copper foil, and the negative electrode active material layer 302 includes n negative electrode active material components, in the negative electrode active material component The negative electrode materials are the same, and the negative electrode materials are all hard carbon negative electrode materials, but the mass fraction of hard carbon in each negative electrode active material component is different. The n negative electrode active material components are distributed in a two-dimensional layered structure, from the negative electrode current collector layer 301 to The diaphragm direction is the first negative electrode active material assembly 3021, the second negative electrode active material assembly 3022, ..., the nth negative electro...

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Abstract

The invention discloses a multifunctional composite negative plate and a preparation method thereof, and a secondary battery. The multifunctional composite negative plate comprises a negative currentcollector layer and a negative active material layer. The negative electrode active material layer comprises a plurality of negative electrode active material assemblies. The negative electrode activematerial assemblies are prepared from a negative electrode material, a binder and a conductive additive, the plurality of negative electrode active material assemblies are distributed between the negative electrode current collector layer and the diaphragm in a two-dimensional laminated structure or a three-dimensional laminated structure, and the plurality of negative electrode active material assemblies have different physical properties or different chemical compositions. According to the invention, structural design is performed on the negative electrode active material layer, the multifunctional composite negative plate and the secondary battery give full play to the functions of different negative active material assemblies, the defects of single negative active material layer structure and short function in the prior art are overcome, 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 negative electrode sheet, 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 requirements for battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M10/0525H01M10/054
CPCH01M4/13H01M4/36H01M4/139H01M10/0525H01M10/054Y02E60/10
Inventor 凌仕刚李山山朱卫泉苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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