Positive plate and lithium ion battery

A technology of positive electrode sheet and positive electrode film, applied in the field of positive electrode sheet and lithium ion battery, can solve the problems of increasing the manufacturing cost of lithium ion battery, reducing the energy density of lithium ion battery, etc., so as to improve high temperature cycle performance and safety performance, and improve oxidability Strong and safe effect

Active Publication Date: 2019-12-10
CONTEMPORARY AMPEREX TECH CO
View PDF3 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, lithium iron phosphate will also reduce the working voltage of lithium-ion batteries, thus greatly reducing the energy density of lithium-ion batter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positive plate and lithium ion battery
  • Positive plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0044] Example 1

[0045] (1) Preparation of positive electrode sheet

[0046] LiNi with secondary particle structure 0.8 Co 0.12 Mn 0.08 O 2 And single crystal grain structure of LiNi 0.8 Co 0.12 Mn 0.08 O 2 The first positive electrode active material formed by mixing at a mass ratio of 7:3, the binder polyvinylidene fluoride (PVDF), and the conductive agent conductive carbon (Super-P) are mixed uniformly, and then the solvent N-methylpyrrolidone (NMP) is added. After stirring and mixing, the first positive electrode slurry is obtained. Among them, the solid mass ratio of the first positive electrode active material, Super-P and PVDF is 95:2.5:2.5, and the secondary particle structure of LiNi 0.8 Co 0.12 Mn 0.08 O 2 The particle size is 11μm, single crystal grain structure of LiNi 0.8 Co 0.12 Mn 0.08 O 2 The particle size is 3 μm, and the solid content of the first positive electrode slurry is 70%.

[0047] The olivine-type lithium iron phosphate (LiFePO 4 ), the binder polyvinyli...

Example Embodiment

[0058] Example 2

[0059] The preparation process of the lithium ion battery is the same as in Example 1, the difference is that:

[0060] (1) Preparation of positive electrode sheet

[0061] The first positive electrode active material consists of LiNi with secondary particle structure 0.8 Co 0.12 Mn 0.08 O 2 And single crystal grain structure of LiNi 0.8 Co 0.12 Mn 0.08 O 2 Mix and form according to mass ratio 8:2;

[0062] The compacted density of the positive electrode sheet is 3.11g / cm 3 ;

[0063] By controlling the coating weight of the first positive electrode slurry and the second positive electrode slurry, the total reversible capacity ratio of the first positive electrode active material to the second positive electrode active material per unit area of ​​the final positive electrode membrane is 3.2:1;

[0064] Reasonably control the standing time, drying temperature, and cold pressing pressure of the first positive electrode slurry and the second positive electrode slurry, so ...

Example Embodiment

[0065] Example 3

[0066] The preparation process of the lithium ion battery is the same as in Example 1, the difference is that:

[0067] (1) Preparation of positive electrode sheet

[0068] The first positive electrode active material consists of LiNi with secondary particle structure 0.8 Co 0.12 Mn 0.08 O 2 And single crystal grain structure of LiNi 0.8 Co 0.12 Mn 0.08 O 2 Mix by mass ratio 9:1;

[0069] The compacted density of the positive electrode sheet is 3.00g / cm 3 ;

[0070] By controlling the coating weight of the first positive electrode slurry and the second positive electrode slurry, the total reversible capacity ratio of the first positive electrode active material to the second positive electrode active material per unit area of ​​the final positive electrode membrane is 3.2:1;

[0071] Reasonably control the standing time, drying temperature, and cold pressing pressure of the first positive electrode slurry and the second positive electrode slurry, so that the thickness ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a positive plate and a lithium ion battery. The positive plate comprises a positive current collector and a positive diaphragm, wherein the positive diaphragm is arranged on thepositive current collector and comprises a first positive material layer and a second positive material layer, the first positive electrode material layer is arranged on the positive electrode current collector and comprises a first positive electrode active material, the first positive electrode active material is a ternary positive electrode material, the second positive electrode material layer is arranged on the first positive electrode material layer and comprises a second positive electrode active material, the second positive electrode active material is selected from one or more of olivine type lithium-containing phosphate and spinel type lithium manganate, the total reversible capacity of the first positive electrode active material per unit area of the positive electrode diaphragm is a, the total reversible capacity of the second positive electrode active material per unit area of the positive electrode diaphragm is b, and that a/b is not smaller than 1 and is not greater than 30 is satisfied. The positive plate is advantaged in that high-temperature cycle performance and safety performance of the lithium ion battery can be improved, and the lithium ion battery is ensured to have relatively high energy density.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a positive electrode sheet and a lithium ion battery. Background technique [0002] The energy crisis and smog have led to an increasingly urgent demand and development of new energy vehicles. It is an inevitable trend for pure electric new energy vehicles to gradually replace traditional gasoline vehicles. However, new energy vehicles have increasingly high requirements for power batteries. more prominent. For example, high-quality new energy vehicles require lithium-ion batteries to have higher energy density, so as to ensure that new energy vehicles have a longer cruising range; high-quality new energy vehicles also require lithium-ion batteries to have better cycle performance, so that Ensure that new energy vehicles have a longer service life; high-quality new energy vehicles have more stringent requirements for safety performance, and need to avoid thermal runaway of lit...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/66H01M10/0525H01M4/505H01M4/525H01M4/58
CPCH01M4/505H01M4/525H01M4/5825H01M4/667H01M10/0525Y02E60/10
Inventor 孟焕平杜锐柳娜闫传苗
Owner CONTEMPORARY AMPEREX TECH CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap