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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
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  • Summary
  • Abstract
  • Description
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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 the limitation of oven and other processes
(3) Slurry needs to be prepared for coating: firstly, the various chemical reagents used in the preparation of the slurry will pollute the environment; The configured slurry is exactly the same
(4) The coating obtained by the traditional process is at the micron level, which is not conducive to the improvement of the energy density of the battery; in addition, the thicker coating will make the gas permeability of the separator drop significantly

Method used

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  • 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

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preparation example Construction

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

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

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

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

[0042] Wherein, a cooling roller is provided between the unwinding mechanism and the winding mechanism, and the cooling roller is located above the vapor deposition equipment to prevent deformation of the base material due to heat.

[0043]The preparation method of the present invention utilizes vapor deposition technology to vaporize the coating material and diffus...

Embodiment 1

[0078] figure 1 The schematic diagram of the process flow principle of the preparation method of the lithium-ion battery diaphragm provided by the embodiment of the present invention, such as figure 1 As shown, the preparation method of the lithium-ion battery separator includes an unwinding mechanism in a vacuum reaction chamber, a cooling roller, a vapor deposition device and a winding device, 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 using the above device to prepare the diaphragm includes: fixing the base material in the unwinding mechanism, feeding the optional coating material plasma gas into the vacuum reaction chamber; after adjusting a certain vacuum degree and other coating parameters, opening the unwinding mechanism And winding mechanism, according to a certain line speed for continuous coating;

[0080] The coating material is ...

Embodiment 2

[0091] A preparation method of a lithium-ion battery separator, the difference from Example 1 is:

[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, the heating temperature is 1250°C;

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

[0095] In terms of mechanical properties of the coated lithium-ion battery separator obtained in this example, the heat shrinkage rate decreased by 0.1% to 15%, and the Gurley value used to characterize the air permeability increased by 0 to 20.

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

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

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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

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Application Information

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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
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