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Preparation method of graphite negative electrode of lithium ion battery for electric tool

A lithium-ion battery, power tool technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of active material structure collapse, negative energy density and rate performance reduction, negative surface intercalation and other problems, to eliminate shearing Effects of shear stress, improved adhesion, and reduced contact resistance

Active Publication Date: 2020-04-28
SUZHOU REDEFINE IND DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The negative electrodes of lithium-ion batteries for electric tools are generally graphite negative electrodes. Natural graphite has the advantages of wide sources, high energy density, and easy processing. It is the first choice as the negative electrode active material. When it is lowered, it is easy to appear intercalation phenomenon on the surface of the negative electrode, and the functional group of the chain carbonate is easily embedded in the layer of natural graphite, causing the structure of the active material of the negative electrode to collapse, and it will also cause the electrolyte material to decompose on the surface of the negative electrode. The best solution is to use artificial graphite instead of natural graphite, but the energy density of artificial graphite is relatively low, the conductivity is smaller than natural graphite, and the compaction density is difficult to achieve as large as natural graphite, resulting in a decrease in the energy density and rate performance of the negative electrode , and the mixed negative electrode of artificial graphite and natural graphite is also difficult to achieve high energy density and high stability at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Add SBR and CMC into deionized water, stir for 3 hours, after the dispersion is uniform, add natural graphite in 4 times and stir for 3 hours to obtain a natural graphite slurry with a solid content of 50%, wherein the SBR, CMC and natural graphite are mixed. The weight ratio is 3:1:100, and the average particle size D50 of the natural graphite is 5.6 μm;

[0034] 2) Add SBR and CMC into deionized water, stir for 3 hours, and after uniform dispersion, add artificial graphite in 4 times and stir for 3 hours to obtain artificial graphite slurry with a solid content of 50%, wherein the SBR, CMC and artificial graphite are mixed. The weight ratio is 3:1:100, and the average particle size D50 of the artificial graphite is 3.2 μm;

[0035] 3) Add CMC into deionized water, stir for 3 hours, and after dispersing evenly, add carbon nanofiber a in 4 times and stir for 3 hours to obtain carbon nanofiber a slurry with a solid content of 50%, wherein the CMC and carbon nanofibers...

Embodiment 2

[0042] 1) Add SBR and CMC into deionized water, stir for 3 hours, and after the dispersion is uniform, add natural graphite in 4 times and stir for 3 hours to obtain a natural graphite slurry with a solid content of 54%, wherein the SBR, CMC and natural graphite are mixed. The weight ratio is 5:3:100, and the average particle size D50 of the natural graphite is 5.8 μm;

[0043] 2) Add SBR and CMC into deionized water, stir for 3 hours, after dispersing evenly, add artificial graphite in 4 times and stir for 3 hours to obtain artificial graphite slurry with a solid content of 54%, wherein the SBR, CMC and artificial graphite are mixed. The weight ratio is 5:3:100, and the average particle size D50 of the artificial graphite is 3.5 μm;

[0044] 3) Add CMC into deionized water, stir for 3 hours, and after uniform dispersion, add carbon nanofiber a in 4 times, and stir for 3 hours to obtain carbon nanofiber a slurry with a solid content of 54%, wherein the CMC and carbon nanofiber...

Embodiment 3

[0051] 1) Add SBR and CMC into deionized water, stir for 3 hours, and after the dispersion is uniform, add natural graphite in 4 times and stir for 3 hours to obtain a natural graphite slurry with a solid content of 52%, wherein the SBR, CMC and natural graphite are mixed. The weight ratio is 2:1:50, and the average particle size D50 of the natural graphite is 5.7 μm;

[0052] 2) Add SBR and CMC into deionized water, stir for 3 hours, and after uniform dispersion, add artificial graphite in 4 times and stir for 3 hours to obtain artificial graphite slurry with a solid content of 52%, wherein the SBR, CMC and artificial graphite are mixed together. The weight ratio is 2:1:50, and the average particle size D50 of the artificial graphite is 3.4 μm;

[0053] 3) Add CMC into deionized water, stir for 3 hours, and after dispersing evenly, add carbon nanofibers a in 4 times and stir for 3 hours to obtain carbon nanofiber a slurry with a solid content of 52%, wherein the CMC and carbo...

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Abstract

The invention provides a preparation method of a graphite negative electrode of a lithium ion battery for an electric tool. The graphite negative electrode comprises a current collector and a structured active material layer located on the surface of the current collector, wherein the active material layer comprises an active material, carbon nanofibers and a binder, the active material comprisesnatural graphite and artificial graphite, the average particle size D50 of the natural graphite is 5.6-5.8[mu]m, the average particle size D50 of the artificial graphite is 3.2-3.5[mu]m, and the carbon nanofibers comprise carbon nanofibers a with an average length of 130-150[mu]m and carbon nanofibers b with an average length of 18-22[mu]m. The preparation method comprises the steps of preparing first slurry, second slurry and third slurry from the materials according to different proportions, and respectively coating the current collector with the first slurry, the second slurry and the thirdslurry in sequence for drying to obtain the structured active material layer. The graphite negative electrode obtained by the preparation method has high energy density, high rate capability, high electrolyte stability and long cycle life.

Description

technical field [0001] The invention relates to a method for preparing a graphite negative electrode of a lithium ion battery for an electric tool, especially an electric car washing gun. Background technique [0002] Lithium-ion battery anodes for power tools generally use graphite anodes. Natural graphite has the advantages of wide sources, high energy density, and easy processing. It is the first choice as anode active materials. However, the electrolyte in the battery is at high temperature and high potential. When it goes down, the intercalation phenomenon easily occurs on the surface of the negative electrode, and the functional groups of the chain carbonate are easily embedded in the layer of natural graphite, which causes the structure of the active material of the negative electrode to collapse, and also leads to the decomposition of the electrolyte material on the surface of the negative electrode. The solution is to use artificial graphite to replace natural graph...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/583H01M4/62H01M10/0525
CPCH01M4/1393H01M4/583H01M4/62H01M4/621H01M10/0525H01M2004/027Y02E60/10
Inventor 李壮
Owner SUZHOU REDEFINE IND DESIGN CO LTD
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