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Surface coating for improving security performance of power lithium ion battery, surface coating application and power lithium ion battery

A lithium-ion battery, safety performance technology, applied in surface coating applications and power lithium-ion battery, power lithium-ion battery, surface coating field, can solve the problem of reducing battery power performance and energy density, aggravating battery polarization phenomenon, increasing battery, etc. problems, to achieve the effect of improving cycle life, avoiding direct contact, and reducing side reactions

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, the use of functional electrolytes will have a significant negative impact on the electrochemical performance of the battery, especially increasing the DC internal resistance (DCR) of the battery, aggravating the polarization of the battery, and reducing the power performance and energy density of the battery.

Method used

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  • Surface coating for improving security performance of power lithium ion battery, surface coating application and power lithium ion battery
  • Surface coating for improving security performance of power lithium ion battery, surface coating application and power lithium ion battery
  • Surface coating for improving security performance of power lithium ion battery, surface coating application and power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of surface coating slurry: the α-Al of 30% mass ratio 2 o 3 , 4.0% by mass ratio of polyvinylidene fluoride (PVDF) were added to 66% by mass ratio of N-methylpyrrolidone (NMP), stirred at a speed of 1500-2000r / min for 2-6 hours and evenly mixed to form a surface coating slurry.

[0028] (2) Preparation of positive electrode slurry: LiNi with 98.25% mass ratio 1 / 3Mn 1 / 3Co 1 / 3O 2 The positive electrode active material, the carbon nanotube (CNT) conductive agent of 0.6% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1.15% by mass ratio are added in N-methylpyrrolidone (NMP) respectively, under the rotating speed 2000r / min Stir to mix evenly to form positive electrode slurry.

[0029] (3) Preparation of negative electrode slurry: carboxymethyl cellulose (CMC) and 1.8% mass ratio of artificial graphite of 76.56% mass ratio, natural graphite of 19.14% mass ratio, conductive carbon black of 1% mass ratio, 1.5% mass ratio The mass ratio of st...

Embodiment 2

[0045] (1) Preparation of surface coating slurry: the AlOOH of 30% mass ratio, the polyvinylidene fluoride (PVDF) of 5.0% mass ratio are respectively added in the N-methylpyrrolidone (NMP) of 60% mass ratio, at the rotating speed Stir at 1500-2000r / min for 2-6 hours to evenly mix to form surface coating slurry.

[0046] (2) Preparation of positive electrode slurry: LiNi with 98.25% mass ratio 0.5 mn 0.3 co 0.2 o 2 The positive electrode active material, the carbon nanotube (CNT) conductive agent of 0.6% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1.15% by mass ratio are added in N-methylpyrrolidone (NMP) respectively, under the rotating speed 2000r / min Stir to mix evenly to form positive electrode slurry.

[0047] (3) Preparation of negative electrode slurry: carboxymethyl cellulose (CMC) and 1.8% mass ratio of artificial graphite of 76.56% mass ratio, natural graphite of 19.14% mass ratio, conductive carbon black of 1% mass ratio, 1.5% mass ratio The mass ra...

Embodiment 3

[0055] (1) Preparation of surface coating slurry: the α-Al of 30% mass ratio 2 o 3 , 5.0% by mass ratio of polyvinylidene fluoride (PVDF) were added to 65% by mass ratio of N-methylpyrrolidone (NMP), stirred at a speed of 1500-2000r / min for 2-6 hours and evenly mixed to form a surface coating slurry.

[0056] (2) Preparation of positive electrode slurry: LiNi with 98.25% mass ratio 0.5 mn 0.3 co 0.2 o 2 The positive electrode active material, the carbon nanotube (CNT) conductive agent of 0.6% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1.15% by mass ratio are added in N-methylpyrrolidone (NMP) respectively, under the rotating speed 2000r / min Stir to mix evenly to form positive electrode slurry.

[0057] (3) Preparation of negative electrode slurry: carboxymethyl cellulose (CMC) and 1.8% mass ratio of artificial graphite of 76.56% mass ratio, natural graphite of 19.14% mass ratio, conductive carbon black of 1% mass ratio, 1.5% mass ratio The mass ratio of st...

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Abstract

The invention discloses surface coating for improving the security performance of a power lithium ion battery, a surface coating application and the power lithium ion battery. The component of the surface coating slurry of the surface coating is alpha-Al<2>O<3> or AlOOH. The solid content of the surface coating slurry is 5%-50%. The surface coating is coated on the surface of a cathode plate, an anode plate or diaphragm of the battery. The thickness of the surface coating is about 1-15[mu]m. After a surface coating modification technology is applied to the power battery, the direct contact with the cathode plate and anode plate of the battery is avoided; the internal resistance of the battery in a thermal runaway state is clearly increased through adoption of an insulation characteristic of the surface coating; and the heat stability of the cathode plate and anode plate in the thermal runaway state of the battery is improved. Moreover, through application of the surface coating technology, the liquid preserving capability of the battery can be improved, the oxidation of electrolyte is inhibited, and the stability of SEI film is improved, so the service life of the battery is clearly improved. According to the application of the surface coating technology, the security performance of the power battery can be clearly improved, and the circulation capability of the power battery can be properly 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 surface coating for improving the safety performance of the power lithium-ion battery, the application of the surface coating and the power lithium-ion battery. Background technique [0002] The energy density, cycle performance and safety performance of power lithium-ion batteries have always been the focus of the development of corresponding battery products. Therefore, how to further optimize the safety performance of power batteries on the basis of ensuring battery cycle performance and energy density has always been a difficult problem. In the existing technology, in order to improve the safety performance of the battery, functional electrolytes containing flame retardant additives or high impedance additives are often used in the battery system. short-circuit current, thereby improving the safety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/62H01M10/42H01M10/0525
CPCH01M4/131H01M4/133H01M4/628H01M10/0525H01M10/4235Y02E60/10
Inventor 王聪张豪曹晓燕吴正斌
Owner 天津中科先进技术产业有限公司
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