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Lithium iron phosphate trace mixed ternary cathode material cathode plate, preparation method thereof and power lithium ion battery

A positive electrode material, lithium iron phosphate technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems affecting battery power performance, uneven surface coating thickness, poor surface coating effect, etc. Achieve the effect of reducing the risk of loss of control, improving safety performance, and avoiding inconsistency

Inactive Publication Date: 2017-11-24
天津中科先进技术产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is surface coating of aluminum oxide or lithium titanate coating on the surface of the pole piece, there are factors such as complex preparation process and uneven surface coating thickness, which cause poor surface coating effect and even affect the power performance of the battery.

Method used

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  • Lithium iron phosphate trace mixed ternary cathode material cathode plate, preparation method thereof and power lithium ion battery
  • Lithium iron phosphate trace mixed ternary cathode material cathode plate, preparation method thereof and power lithium ion battery
  • Lithium iron phosphate trace mixed ternary cathode material cathode plate, preparation method thereof and power lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of positive electrode slurry: LiNi with 96.33% mass ratio 0.5 mn 0.3 co 0.2 o 2 Cathode active material, 1.92% LiFePO 4 The positive electrode material, the carbon nanotube (CNT) conductive agent of 0.6% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1.15% by mass ratio were added in N-methylpyrrolidone (NMP) respectively, and stirred at a rotating speed of 2000r / min Mix evenly to form positive electrode slurry.

[0027] (2) prepare negative electrode slurry: with the artificial graphite of 76.6% mass ratio, the natural graphite of 19.2% mass ratio, the conductive carbon black of 1% mass ratio, the carboxymethyl cellulose (CMC) of 1.5% mass ratio and 1.80% The mass ratio of styrene-butadiene rubber (SBR) was respectively added to the negative electrode solvent deionized water, stirred and mixed evenly at a rotation speed of 2500r / min to form the negative electrode slurry.

[0028] (3) Preparation of positive electrode sheet: The prepared p...

Embodiment 2

[0042] (1) Preparation of positive electrode slurry: LiNi with 92.9% mass ratio 0.6 mn 0.2 co 0.2 o 2 Cathode active material, 2.87% LiFePO 4 The positive electrode material, the carbon nanotube (CNT) conductive agent of 0.6% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1.15% by mass ratio were added in N-methylpyrrolidone (NMP) respectively, and stirred at a rotating speed of 2000r / min Mix evenly to form positive electrode slurry.

[0043] (2) prepare negative electrode slurry: with the artificial graphite of 76.6% mass ratio, the natural graphite of 19.2% mass ratio, the conductive carbon black of 1% mass ratio, the carboxymethyl cellulose (CMC) of 1.5% mass ratio and 1.80% The mass ratio of styrene-butadiene rubber (SBR) was respectively added to the negative electrode solvent deionized water, stirred and mixed evenly at a rotation speed of 2500r / min to form the negative electrode slurry.

[0044] (3) Preparation of positive electrode sheet: The prepared po...

Embodiment 3

[0050] (1) Preparation of positive electrode slurry: LiNi with 91.9% mass ratio 0.8 mn 0.1 co 0.1 o 2 Cathode active material, 3.80% LiFePO 4 Positive electrode material, conductive carbon black and carbon nanotube (CNT) of 2.5% by mass ratio, polyvinylidene fluoride (PVDF) of 1.8% by mass ratio join in N-methylpyrrolidone (NMP) respectively, at rotating speed 3000r / min Stir and mix evenly to form positive electrode slurry;

[0051] (2) Preparation of negative electrode slurry: the primary particle lithium titanate of 9.05% mass ratio of artificial graphite, 81.45% mass ratio of natural graphite, 5% mass ratio of lithium titanate, 1% mass ratio of conductive carbon black, 1.5% mass ratio of Carboxymethyl cellulose (CMC) and 2.0% mass ratio of styrene-butadiene rubber (SBR) were added to the negative electrode solvent deionized water respectively, stirred and mixed evenly at a rotating speed of 2500r / min to form a negative electrode slurry;

[0052] (3) Preparation of posi...

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Abstract

The invention provides a lithium iron phosphate trace mixed ternary cathode material cathode plate, a preparation method thereof and a power lithium ion battery. The lithium iron phosphate trace mixed ternary cathode material cathode plate comprises a cathode material and a current collector. The cathode material comprises a cathode active material, cathode conductive agent and cathode adhesive. The ternary cathode material, lithium iron phosphate, the cathode conductive agent, the cathode adhesive and the cathode solvent are uniformly dispersed, stirred and mixed to form cathode slurry. The mass ratio of the lithium iron phosphate of the whole cathode active material is 0.1%-15%. The invention also provides the preparation method for the cathode plate and the power lithium ion battery employing the cathode plate. According to the cathode plate, the method and the battery, when a partial short circuit occurs due to abuse of a test in a battery, the heat stability is improved; and after trace lithium iron phosphate is mixed with the cathode plate, the conductivity of the cathode plate is clearly improved, the resistance of the cathode plate is rapidly reduced, and the heat generated by the plate in a short circuit process is rapidly reduced, so the security performance of the battery is clearly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a power lithium-ion battery, and more specifically, relates to a positive electrode sheet using lithium iron phosphate mixed with a ternary positive electrode material in a small amount, a preparation method thereof, and a power lithium-ion battery. Background technique [0002] Improving the power performance and cycle life of power lithium-ion batteries, and improving their safety performance have always been the focus of product development. Therefore, how to further optimize the safety performance of power batteries on the basis of ensuring battery power performance and cycle stability has always been a difficult problem. In the prior art, in order to improve the safety performance of the battery, a protective layer of inert material is coated on the surface of the positive and negative electrodes to increase the surface resistance of the electrode sheet and impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/131H01M4/1391H01M10/42H01M10/0525
CPCH01M4/131H01M4/1391H01M4/364H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/4235Y02E60/10
Inventor 王聪张家科张豪吴正斌
Owner 天津中科先进技术产业有限公司
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