Preparation method of lithium ion battery diaphragm, lithium ion battery diaphragm and lithium ion battery

A technology for lithium-ion batteries and diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as inability to ensure that the slurry is completely consistent, troublesome adjustment of the proportion of slurry, and decreased gas permeability of the diaphragm. Large-scale industrial production, excellent uniformity and consistency, and the effect of reducing thermal shrinkage

Inactive Publication Date: 2018-12-14
CHANGZHOU XINGYUAN NEW ENERGY MATERIAL CO LTD
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The coating formed by the current micro-gravure roller coating process mainly has the following disadvantages: (1) Due to the influence of factors such as the air pressure control of the feeding system, the cleanliness of the roller surface, the wear of the roller and scraper, the temperature control of the oven, and the speed control, etc. , the uniformity is not stable
(2) The cleaning of machinery and equipment is troublesome, and the coating speed is relatively slow due to t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of lithium ion battery diaphragm, lithium ion battery diaphragm and lithium ion battery
  • Preparation method of lithium ion battery diaphragm, lithium ion battery diaphragm and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] In the first aspect, in some embodiments, a method for preparing a lithium ion battery separator is provided, which includes the following steps:

[0039] Fix the base material in the unwinding mechanism in the vacuum reaction chamber, and pass the optional coating material plasma gas into the vacuum reaction chamber;

[0040] Use vapor deposition equipment to vaporize the coating material into the vacuum reaction chamber, and deposit the coating material on the base material by vapor deposition;

[0041] The base material with the coating material deposited on the surface is collected in the winding mechanism;

[0042] Wherein, a cooling roll is also provided between the unwinding mechanism and the winding mechanism, and the cooling roll is located above the vapor deposition device to prevent the base material from being deformed by heating.

[0043] The preparation method of the present invention uses vapor deposition technology to vaporize and diffuse the coating material into...

Example Embodiment

[0077] Example 1

[0078] figure 1 It is a schematic diagram of the process principle of the preparation method of the lithium ion battery separator provided by the embodiment of the present invention, such figure 1 As shown, the preparation method of the lithium ion battery diaphragm includes an unwinding mechanism, a cooling roller, a vapor deposition device, and a winding device in a vacuum reaction chamber, wherein the cooling roller is located between the unwinding mechanism and the winding mechanism, And located directly above the vapor deposition equipment;

[0079] The process of preparing the diaphragm using the above device includes: fixing the base material in the unwinding mechanism, and injecting the optional coating material plasma gas into the vacuum reaction chamber; after adjusting a certain degree of vacuum and other coating parameters, turning on the unwinding mechanism And winding mechanism, continuous coating according to a certain linear speed;

[0080] Use v...

Example Embodiment

[0090] Example 2

[0091] A method for preparing a lithium ion battery separator, which is different from Example 1 in:

[0092] In this embodiment, the base material is PP and the coating material is Al 2 O 3 , The plasma gas is O 2 , The coating method adopts chemical vapor deposition (CVD);

[0093] The vacuum degree of the vacuum reaction chamber is 1×10 -3 Pa, heating temperature is 1250℃;

[0094] The thickness of the base material is 12-25 μm, and the thickness of the coating is 1nm-115nm.

[0095] In this embodiment, the coated lithium ion battery separator is obtained. In terms of mechanical properties, the thermal shrinkage rate is reduced by 0.1% to 15%, and the Gurley value used to characterize the gas permeability is increased by 0 to 20.

[0096] In terms of electrochemical performance: the diaphragm surface resistance is reduced by 4%-20%, and the electrolyte retention rate is increased by 20-40%.

[0097] Applying the lithium-ion battery separator of this implementation t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of lithium ion batteries and relates to a preparation method of a lithium ion battery diaphragm, a lithium ion battery diaphragm and a lithium ion battery.The preparation method of the invention comprises the following steps: fixing a base material in an unwinding mechanism in a vacuum reaction chamber, and introducing optional coating material plasmagas into the vacuum reaction chamber; The coating material is vaporized into a vacuum reaction chamber by vapor deposition equipment, and the coating material is deposited on the base material by a vapor deposition method; the base material with the coating material deposited on the surface is stored in the winding mechanism; A cooling roller is also arranged between the unwinding mechanism and the winding mechanism, and the cooling roller is located above the vapor deposition equipment. The thickness of the coating is greatly reduced compared with the traditional process, the coating has goodair permeability and uniformity; The equipment has high cleanliness, the quantity of impurities introduced is greatly reduced, and the slurry does not need to be prepared, which can reduce the environmental pollution; and The coating has no additive and excellent thermal stability and oxidation resistance are achieved in a high temperature and high pressure system.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery diaphragm, a lithium ion battery diaphragm and a lithium ion battery. Background technique [0002] A lithium-ion battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. The separator is the separator material between the positive electrode and the negative electrode of the battery. It is one of the key inner components and determines the interface structure and internal resistance of the battery. The separator can ensure the passage of ions in the electrolyte and is used to prevent problems such as self-discharge and short circuit of the battery. [0003] In recent years, with the increasingly widespread application of lithium-ion batteries, higher requirements have been put forward for the comprehensive performance of lithium-ion batteries. Generally, increasing the po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/449H01M50/489
CPCH01M10/0525H01M50/431H01M50/403H01M50/449Y02E60/10
Inventor 王杨毅张晓民陈秀峰朱继俊
Owner CHANGZHOU XINGYUAN NEW ENERGY MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap