Method for preparing lithium ion battery mixed positive electrode

A lithium-ion battery, hybrid cathode technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc. Stability, the effect of avoiding the increase of the interface resistance

Active Publication Date: 2018-12-04
JIANGXI DIBIKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the gradual increase in the energy density, output power and cycle life requirements of electric tools for batteries, the positive electrode composed of a single active material can no longer meet the needs of electric tools, and batteries with mixed positive electrode materials have become the focus of research and development. , different mixing technologies and different structural designs for active materials are required. Although the current mixed materials can provide high output power and energy density, the internal resistance of the pole piece is biased due to excessive compression of the pole piece. Large, heat release is obvious at high rates, and the cycle life of the battery is deteriorated due to the dissolution of the transition metal Ni

Method used

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  • Method for preparing lithium ion battery mixed positive electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1), providing a first active material, a second active material and a third active material, wherein the molecular formula of the first active material is LiNi 0.8 mn 0.1 co 0.1 o 2 , the molecular formula of the second active material is LiNi 0.3 mn 0.4 co 0.3 o 2 , the third active material is LiMnPO 4 ;

[0025] 2) Add NMP into the first vacuum stirred tank, add sodium carboxymethyl cellulose, PVDF, and superconducting carbon black Super P into the first vacuum stirred tank in turn, stir for 3 hours to obtain a dispersed solution, and add the average The first active material particles with a particle size of 2.5 microns and an aspect ratio of 1.5 were stirred for 4 hours at a stirring speed of 30 r / min to obtain the first slurry, wherein the mass ratio, the first active material: PVDF: sodium carboxymethylcellulose : superconducting carbon black Super P=100:2:6:3, the solid content of the first slurry is 52%;

[0026] 3), NMP was added to the second vacuum ...

Embodiment 2

[0032] 1), providing a first active material, a second active material and a third active material, wherein the molecular formula of the first active material is LiNi 0.8 mn 0.1 co 0.1 o 2 , the molecular formula of the second active material is LiNi 0.3 mn 0.4 co 0.3 o 2 , the third active material is LiMnPO 4 ;

[0033] 2), NMP was added to the first vacuum stirred tank, sodium carboxymethyl cellulose, PVDF, and superconducting carbon black Super P were added to the first vacuum stirred tank in turn, and stirred for 5 hours to obtain a dispersed solution. The first active material particles with a particle size of 4 microns and an aspect ratio of 1.8 were stirred for 6 hours at a stirring speed of 90 r / min to obtain the first slurry, wherein the mass ratio, the first active material: PVDF: sodium carboxymethylcellulose : superconducting carbon black Super P=100:4:9:5, the solid content of the first slurry is 56%;

[0034] 3), NMP was added to the second vacuum stirr...

Embodiment 3

[0040] 1), providing a first active material, a second active material and a third active material, wherein the molecular formula of the first active material is LiNi 0.8 mn 0.1 co 0.1 o 2 , the molecular formula of the second active material is LiNi 0.3 mn 0.4 co 0.3 o 2 , the third active material is LiMnPO 4 ;

[0041] 2), NMP was added to the first vacuum stirred tank, sodium carboxymethyl cellulose, PVDF, and superconducting carbon black Super P were added to the first vacuum stirred tank in turn, stirred for 4 hours to obtain a dispersed solution, and the average The first active material particles with a particle size of 3 microns and an aspect ratio of 1.6 were stirred for 5 hours at a stirring speed of 60 r / min to obtain the first slurry, wherein the mass ratio, the first active material: PVDF: sodium carboxymethylcellulose : superconducting carbon black Super P=100:3:7:4, the solid content of the first slurry is 55%;

[0042] 3), NMP was added to the second ...

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Abstract

The invention provides a method for preparing a lithium ion battery mixed positive electrode. Slurries comprise different proportions of a first active material, a second active material and a third active material, wherein the molecular formula of the first active material is LiNi0.8Mn0.1Co0.1O2, the molecular formula of the second active material is LiNi0.3Mn0.4Co0.3O2, and the molecular formulaof the third active material is LiMnPO4, and particles with two particle sizes exist in the first active material; the average particle size of the second active material is 50-200 nm, the length-to-diameter ratio of the second active material is 1.1-1.3, and the D90 / D10 value of the second active material is 1.6-2.2; and the average particle size of the third active material is 0.5-1 [mu]m, thelength-to-diameter ratio of the third active material is 1.5-2, and the D90 / D10 value of the third active material is 1.2-1.5. The slurries are respectively prepared according to the different structures of the active materials, a current collector is respectively coated with the slurries to sequentially obtain a first active material layer, a first active material and second active material mixedlayer and a third active material layer along a direction from a position adjacent to the current collector to a position away from the current collector. The slurries obtained in the invention havegood dispersibility and good retention performances, and the positive electrode has good high-rate performances and a high energy density.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium ion battery mixed positive electrode. Background technique [0002] With the gradual increase in the energy density, output power and cycle life requirements of electric tools for batteries, the positive electrode composed of a single active material can no longer meet the needs of electric tools, and batteries with mixed positive electrode materials have become the focus of research and development. , different mixing technologies and different structural designs for active materials are required. Although the current mixed materials can provide high output power and energy density, the internal resistance of the pole piece is biased due to excessive compression of the pole piece. Large, the heat release is obvious at high rates, and the cycle life of the battery is deteriorated due to the dissolution of the transition metal Ni. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M10/0525H01M4/66
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/667H01M10/0525Y02E60/10
Inventor 邓丽萍
Owner JIANGXI DIBIKE
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