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Preparation method for positive electrode

A positive electrode and lithium nickel manganese oxide technology, which is applied in the field of positive electrode preparation, can solve the problems of active material layer structure collapse, active material falling off, and uneven dispersion of slurry, so as to prevent cycle performance from deteriorating, good stability, Good magnification performance

Inactive Publication Date: 2020-11-13
苏州精诚智造智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Power lithium-ion batteries often use mixed positive electrode materials as the active material of the positive electrode to obtain higher operating voltage and higher energy density. However, the suitable particle size of different positive electrode active materials is different, resulting in uneven dispersion of the slurry or It is the structure of the active material layer that collapses with the charge and discharge cycle, causing the active material to fall off and affecting the cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) providing lithium nickel manganate, wherein the D50 of the lithium nickel manganate is 2.0 microns, D90=k*D50=2.90 microns, wherein k=1.45;

[0027] 2) providing lithium cobalt manganate, wherein the D'50 of the lithium cobalt manganate is 1.4 microns, D'90=m*D'50=2.30 microns, wherein m=1.64;

[0028] 3) adding the binder to the solvent, stirring for 4 hours, adding the conductive agent and lithium nickel manganate, and stirring for 4 hours to obtain the first slurry;

[0029] 4) adding the binder into the solvent, stirring for 4 hours, adding the conductive agent and lithium cobalt manganate, and stirring for 4 hours to obtain the second slurry;

[0030] 5) According to the mass ratio of lithium nickel manganate and lithium cobalt manganate in the slurry, lithium nickel manganate / lithium cobalt manganate=r+1.26*(D90 / D'90-0.72)=1.55, where r =0.87, adding the first slurry to the second slurry, stirring for 4 hours, to obtain a mixed slurry;

[0031] 6) Coating the...

Embodiment 2

[0033] 1) providing lithium nickel manganate, wherein the D50 of the lithium nickel manganate is 2.1 microns, D90=k*D50=3.07 microns, wherein k=1.46;

[0034] 2) providing lithium cobalt manganate, wherein the D'50 of the lithium cobalt manganate is 1.5 microns, D'90=m*D'50=2.48 microns, wherein m=1.65;

[0035] 3) adding the binder to the solvent, stirring for 4 hours, adding the conductive agent and lithium nickel manganate, and stirring for 4 hours to obtain the first slurry;

[0036] 4) adding the binder into the solvent, stirring for 4 hours, adding the conductive agent and lithium cobalt manganate, and stirring for 4 hours to obtain the second slurry;

[0037] 5) According to the mass ratio of the lithium nickel manganate and lithium cobalt manganate in the slurry, lithium nickel manganate / lithium cobalt manganate=r+1.26*(D90 / D'90-0.72)=1.53, where r =0.88, the first slurry was added to the second slurry, and stirred for 4 h to obtain a mixed slurry;

[0038] 6) Coatin...

Embodiment 3

[0040] 1) providing lithium nickel manganate, wherein the D50 of the lithium nickel manganate is 2.2 microns, D90=k*D50=3.23 microns, wherein k=1.47;

[0041] 2) providing lithium cobalt manganate, wherein the D'50 of the lithium cobalt manganate is 1.6 microns, D'90=m*D'50=2.66 microns, wherein m=1.66;

[0042] 3) adding the binder to the solvent, stirring for 4 hours, adding the conductive agent and lithium nickel manganate, and stirring for 4 hours to obtain the first slurry;

[0043] 4) adding the binder into the solvent, stirring for 4 hours, adding the conductive agent and lithium cobalt manganate, and stirring for 4 hours to obtain the second slurry;

[0044] 5) According to the mass ratio of the lithium nickel manganate and lithium cobalt manganate in the slurry, lithium nickel manganate / lithium cobalt manganate=r+1.26*(D90 / D'90-0.72)=1.51, where r =0.89, the first slurry was added to the second slurry, and stirred for 4 h to obtain a mixed slurry;

[0045] 6) Coatin...

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Abstract

The invention provides a preparation method of a positive electrode. An active substance of the positive electrode comprises lithium nickel manganese oxide and lithium cobalt manganese oxide. The molecular formula of the lithium nickel manganese oxide is LiNi0.35Mn0.6M0.05O2, the molecular formula of the lithium cobalt manganese oxide is LiCo0.35Mn0.6M0.05O2, and M is selected from Al, Mg or Cr. The D50 of the lithium nickel manganese oxide is 2.0-2.2 microns, D90 is equal to k * D50, and k is equal to 1.45-1.47. The method includes the steps: preparing lithium nickel manganese oxide into first slurry; preparing cobalt lithium manganate into second slurry; mass ratio, adding the first slurry into the second slurry to obtain mixed slurry, coating a current collector with the mixed slurry, and drying to obtain the positive electrode. The mixed slurry obtained by the preparation method provided by the invention has fluid properties close to rheological phases, extremely high stability andgood stability, and the obtained positive electrode is long in cycle life and good in rate capability.

Description

technical field [0001] The present invention relates to a preparation method for a positive electrode. Background technique [0002] Power-type lithium-ion batteries often use mixed positive electrode materials as the active material of the positive electrode, thereby obtaining higher working voltage and larger energy density. However, the appropriate particle size of different positive electrode active materials is different, resulting in uneven dispersion of the slurry or It is the structure of the active material layer that collapses with the charge-discharge cycle, causing the active material to fall off and affecting the cycle life. The present invention studies the particle size distribution of specific active materials, and studies the ratio of active materials on the basis of the particle size distribution, and provides a preparation method of a positive electrode. The fluid properties of the mixed slurry obtained by the preparation method provided by the present inv...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 吴浩扬
Owner 苏州精诚智造智能科技有限公司