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Slurry-homogenizing process for positive electrode slurry of lithium ion battery, positive electrode plate and lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of affecting the uniformity of the slurry, poor stability of the slurry, and difficulty in dispersing the slurry , to enhance the bonding effect, solve the problem of difficult dissolution of the binder, and reduce the baking temperature

Active Publication Date: 2017-05-10
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation time of this process is very long, which seriously affects the production efficiency, and the solid content of the slurry is low, which easily leads to poor stability of the slurry, and the slurry is easy to separate after a period of time. The second method is commonly known as the dry process. Put the binder, conductive agent, and active material together into a homogenizer mixer for dry mixing and stirring, and then add a solvent for stirring to prepare a positive electrode slurry. This process
[0004] Compared with the wet process, the stirring time can be shortened to a certain extent, but since the binder is added to the solvent after dry mixing and stirred, it is not easy to dissolve, resulting in difficult dispersion of the slurry, poor dispersion effect, and affecting the uniformity of the slurry

Method used

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  • Slurry-homogenizing process for positive electrode slurry of lithium ion battery, positive electrode plate and lithium ion battery
  • Slurry-homogenizing process for positive electrode slurry of lithium ion battery, positive electrode plate and lithium ion battery

Examples

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Embodiment 1

[0030] A homogenization process for lithium-ion battery cathode slurry, comprising the following steps:

[0031] a) Preparation of glue solution: mix the binder and solvent at a weight ratio of 1:5, stir and disperse at 50°C at a speed of 30Hz for 4 hours to prepare a binder glue solution, and then put the binder glue solution in Vacuum storage at -85KPa;

[0032] b) Stirring with a V-shaped mixer: After mixing the positive active material and the conductive agent, stir in a V-shaped mixer at a speed of 20 Hz for 40 minutes;

[0033] c) Pre-mixing and stirring: Add the positive electrode active material and conductive agent treated in step b into the homogenizer, and then add 40wt% of the binder solution and 20wt% of the remaining solvent into the homogenizer to Stir at a speed of 10 rpm and 300 rpm for 10 minutes, scrape the material after the end, then stir for 20 minutes at a speed of 15 rpm and 1000 rpm, and scrape the material after the end;

[0034] d) High-speed stirr...

Embodiment 2

[0041] A homogenization process for lithium-ion battery cathode slurry, comprising the following steps:

[0042]a) Preparation of glue solution: mix the binder and solvent at a weight ratio of 1:10, stir and disperse at a temperature of 50-60°C at a speed of 30-50Hz for 4-6 hours to prepare a binder glue solution, and then The adhesive glue solution is stored in vacuum at a vacuum degree of -85 ~ -100KPa;

[0043] b) Stirring with a V-shaped mixer: Mix the positive electrode active material and the conductive agent and stir in a V-shaped mixer at a speed of 20-40Hz for 40-60 minutes;

[0044] c) Pre-mixing and stirring: Add the positive electrode active material and conductive agent treated in step b into the homogenate mixer, and then add 40-60wt% of the binder solution and 20-40wt% of the remaining solvent into the homogenate In the mixer, stir at a speed of 10-15 rpm and 300-800 rpm for 10-20 minutes, scrape the material after the end, then stir for 20-30 minutes at a spee...

Embodiment 3

[0052] A homogenization process for lithium-ion battery cathode slurry, comprising the following steps:

[0053] a) Preparation of glue solution: Mix the binder and solvent at a weight ratio of 1:7, stir and disperse at 60°C at a speed of 50Hz for 6 hours to prepare a binder glue solution, and then put the binder glue solution in Vacuum storage at -100KPa;

[0054] b) Stirring with a V-shaped mixer: After mixing the positive electrode active material and the conductive agent, stir in a V-shaped mixer at a speed of 40 Hz for 60 minutes;

[0055] c) Pre-mixing and stirring: Add the positive electrode active material and conductive agent treated in step b into the homogenizer, and then add 60wt% of the binder solution and 40wt% of the remaining solvent into the homogenizer to Stir at a speed of 15 rpm and 800 rpm for 20 minutes, scrape the material after the end, then stir for 30 minutes at a speed of 20 rpm and 1500 rpm, and scrape the material after the end;

[0056] d) High-...

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Abstract

The invention discloses a slurry-homogenizing process for positive electrode slurry of a lithium ion battery, a positive electrode plate and the lithium ion battery, and belongs to the technical field of manufacturing of the lithium ion battery. The slurry-homogenizing process for the positive electrode slurry of the lithium ion battery comprises the steps of preparing an adhesive solution, stirring by a V-shaped stirrer, performing pre-mixing and stirring, performing high-speed stirring, performing viscosity adjustment, performing vacuum defoaming and the like; the positive electrode plate of the lithium ion battery comprises a positive electrode current collector and the positive electrode slurry for coating the positive electrode current collector; the positive electrode current collector adopts an aluminum foil; the positive electrode slurry is prepared by the slurry-homogenizing process for the positive electrode slurry of the lithium ion battery; and the lithium ion battery adopts the positive electrode plate of the lithium ion battery prepared by the method. By adoption of the slurry-homogenizing process, the solid content of the slurry is increased, so that solid granule friction in stirring can be improved, and the uniformity and the stability of the slurry can be improved; and by lowering a baking temperature in a drying oven in coating and drying, gaps formed between active material granules, conducive carbon granules and a binder can be reduced, thereby enhancing an adhesive effect and improving the performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a process for homogenizing a positive electrode slurry of a lithium-ion battery, a positive electrode sheet, and a lithium-ion battery. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, high open circuit voltage, no memory effect, safety and no pollution. After more than 20 years of rapid development, lithium-ion batteries are widely used in notebook computers, mobile phones, digital cameras, energy storage and other fields. In recent years, with the strengthening of people's awareness of environmental protection, the environmental pollution and global warming caused by automobile exhaust have attracted widespread attention. With the energy crisis caused by dwindling resources, the research, development and industrialization of energy-saving and environment-fri...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/133H01M4/139H01M4/1393H01M10/0525
CPCH01M4/13H01M4/133H01M4/139H01M4/1393H01M10/0525Y02E60/10
Inventor 牛志强任宁陈现宝樊海英孙延先臧庆凤
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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