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
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  • 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 batteries; the relatively high content of cobalt (Co) in low-nickel ternary cathode materials will increase the energy density of lithium-ion batteries. manufacturing cost

Method used

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  • Positive plate and lithium ion battery
  • Positive plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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 LiNi with single crystal grain structure 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 is uniformly mixed with the binder polyvinylidene fluoride (PVDF) and the conductive agent conductive carbon (Super-P), and then the solvent N-methylpyrrolidone (NMP) is added , to obtain the first positive electrode slurry after stirring and mixing. 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 LiNi with the secondary particle structure 0.8 co 0.12 mn 0.08 o 2 The particle size is 11μm, LiNi with single crystal particle structure 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 ) and t...

Embodiment 2

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

[0060] (1) Preparation of positive electrode sheet

[0061] The first cathode active material consists of LiNi with secondary particle structure 0.8 co 0.12 mn 0.08 o 2 and LiNi with single crystal grain structure 0.8 co 0.12 mn 0.08 o 2 Formed by mixing at a mass ratio of 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 and the second positive electrode active material per unit area of ​​the final positive electrode film is 3.2:1;

[0064] The resting time, drying temperature and cold pressing pressure of the first positive electrode slurry and the second positive electrode slurry are reasonably controlled, so that the th...

Embodiment 3

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

[0067] (1) Preparation of positive electrode sheet

[0068] The first cathode active material consists of LiNi with secondary particle structure 0.8 co 0.12 mn 0.08 o 2 and LiNi with single crystal grain structure 0.8 co 0.12 mn 0.08 o 2 Formed by mixing at a mass ratio of 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 and the second positive electrode active material per unit area of ​​the final positive electrode film is 3.2:1;

[0071] The resting time, drying temperature and cold pressing pressure of the first positive electrode slurry and the second positive electrode slurry are reasonably controlled, so that the t...

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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

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Application Information

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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
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