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Manufacturing method for safe lithium ion power battery positive plate

A power battery and manufacturing method technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as increasing the cost of material manufacturing technology and raw material manufacturing costs, changing the inherent advantages of lithium-ion batteries, and having no feasibility or applicable value. Achieve the effects of reducing the possibility of oxidation-reduction reactions, good high-rate charge-discharge performance, and excellent electrochemical cycle performance

Inactive Publication Date: 2016-04-13
HUBEI UEE ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of technology obviously has obvious shortcomings and defects: increasing the internal resistance of the electrode, reducing the volume specific capacity or specific energy of the battery, increasing the cost of manufacturing technology, affecting the cycle life of the battery, etc.
[0013] Second, the changes in the properties of individual materials of various types of lithium-ion batteries not only increase the cost of material manufacturing technology and raw material manufacturing costs, but also increase the complexity of the battery manufacturing process and manufacturing costs, which cannot fundamentally solve the problem of lithium-ion batteries. security risks
[0014] Third, the improvement technology of electrolyte, diaphragm and other materials, in the case of increasing the cost of technology and raw materials, not only increases the internal resistance of the battery, changes the inherent advantages of lithium-ion batteries, but also cannot fundamentally or completely eliminate battery gas. Expansion, short circuit, extreme misuse, extreme accidents and possible safety accidents of lithium-ion batteries in extreme environments
[0015] Fourth, the installation of so-called cooling water or cooling air cooling systems for safe lithium-ion battery packs has actually gone beyond the scope of lithium-ion batteries or lithium-ion battery technology. The battery is too complex, the manufacturing cost and the maintenance cost may be extremely high, there is no practical feasibility or application value, it is difficult to achieve large-scale industrial production and achieve good economic and social benefits, let alone the "safety of lithium-ion batteries" "Wait
[0016] Fifth, the battery management system is not a problem that can be solved by the battery field or battery-related technicians, because the battery management system involves physical low-voltage management, computer software design and other related technical fields, and battery technology technicians are unable to solve related technical problems. Involved in the field of battery technology
Obviously, the battery management system cannot fundamentally solve the safety problems of lithium-ion batteries

Method used

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  • Manufacturing method for safe lithium ion power battery positive plate
  • Manufacturing method for safe lithium ion power battery positive plate
  • Manufacturing method for safe lithium ion power battery positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for manufacturing a positive pole piece of a safe lithium-ion power battery, the steps of which are:

[0056] In the first step, the Al-coated double spherical positive electrode active material and the SPS conductive agent with a mass ratio of 100:0.1 (that is, the mass ratio of Super-P to SWCNT, the same below, omitted) are respectively 75% and 20% by mass. % ratio ball milled for 4 hours and mixed evenly to make positive electrode powder positive electrode powder mixture A;

[0057] In the second step, 5% PVdF, which accounts for 5% by mass of the positive electrode active material positive electrode powder mixture A obtained in the first step, is added to the NMP solvent, and stirred for 120 minutes at a temperature of 80°C to form a rubber material B;

[0058] The third step is to add the positive electrode powder mixture A obtained in the first step to the rubber material B in 3 to 5 times, control the mass ratio of the solid amount of the positive electr...

Embodiment 2

[0062] A method for manufacturing a positive pole piece of a safe lithium-ion power battery, the steps of which are:

[0063] In the first step, Al-coated hamburger-shaped positive electrode active material and SPS conductive agent with a mass ratio of 100:0.3 were ball-milled for 6 hours according to the proportions of 80% and 16% by mass and mixed evenly to make a positive electrode powder and a positive electrode powder mixture. A;

[0064] In the second step, PVdF, which accounts for 4% by mass of the positive electrode active material positive electrode powder mixture A obtained in the first step, is added to the NMP solvent, stirred for 100 minutes at a temperature of 80° C., and stirred into a rubber material B;

[0065] The third step is to add the positive electrode powder mixture A obtained in the first step to the rubber material B in 3 to 5 times, control the mass ratio of the solid amount of the positive electrode powder mixture A to NMP between 1350:800, and stir...

Embodiment 3

[0069] A method for manufacturing a positive pole piece of a safe lithium-ion power battery, the steps of which are:

[0070] In the first step, the Si-coated olive body / ellipsoid-shaped positive electrode active material and the SPS conductive agent with a mass ratio of 100:0.5 are ball-milled for 8 hours according to the mass percentages of 85% and 12% respectively, and the positive electrode powder is made. Material positive electrode powder mixture A;

[0071]In the second step, 3% PVdF, which accounts for 3% by mass of the positive electrode active material positive electrode powder mixture A obtained in the first step, is added to the NMP solvent, and stirred for 120 minutes at a temperature of 80°C to form a rubber material B;

[0072] The third step is to add the positive electrode powder mixture A obtained in the first step to the rubber material B in 3 to 5 times, control the mass ratio of the solid amount of the positive electrode powder mixture A to NMP between 145...

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Abstract

The invention discloses a manufacturing method for a safe lithium ion power battery positive plate. The manufacturing method comprises the steps of performing ball milling and mixing on a positive electrode active substance and a conductive agent based on mass percent to obtain a positive electrode powder mixture A; adding the positive electrode powder mixture A into solvent based on a certain proportion, and stirring to obtain a solvent sizing material B; adding the positive electrode powder mixture A into the sizing material B in multiple times, controlling the mass ratio of the solid body quantity of the positive electrode powder mixture A to the solvent, stirring and preparing positive electrode slurry, adjusting and controlling the viscosity of the slurry, and stirring to obtain positive electrode slurry; taking an aluminum foil as a current collector, coating the current collector with the positive electrode slurry in a single-surface coating manner; reserving ML current collector, drying, controlling the surface density, rolling, controlling compaction density and the pole piece thickness; and performing operations of striping, slitting, tab spot welding, and T-shaped tab rubber tape gluing to obtain the safe lithium ion power battery positive plate. The lithium ion battery assembled by the manufactured safe lithium ion power battery positive plate is good in electrical performance and extremely high in safety performance.

Description

technical field [0001] The invention relates to the technical field of batteries, and more specifically relates to a method for manufacturing a positive pole piece of a safe lithium-ion power battery. Background technique [0002] Lithium-ion batteries are mainly composed of positive pole pieces, negative pole pieces, separators, electrolytes, and battery casings (including stainless steel shells, plastic shells, and aluminum-plastic film flexible packaging, etc.). Among them, the positive and negative active materials (mainly including the so-called "unitary material" or "unit material": LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiVO 2 , Li x V 2 o 4 , Li 1+x V 3 o 8 and LiFePO 4 etc. Binary material: LiNi x mn 2-x o 4 、LiCo x mn 2-x o 4 、LiNi x co 1-x o 2、 LiNi 0.5 mn 1.5 o 4 etc., ternary material: LiNi x co y mn 2-x-y o 4 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 etc.) is one of the most critical materials that affect the electrochemical performance of lithium-ion...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCH01M4/1391Y02E60/10
Inventor 林定文胡辉张文博丁先红舒方君杜玉莹田翔项朗李闯周环波
Owner HUBEI UEE ENERGY TECH CO LTD
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