Preparation method of diaphragm and lithium ion battery

A lithium-ion battery and separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as affecting battery performance, easy falling off of ceramic layers, and restricting large-scale applications.

Active Publication Date: 2017-01-04
LONG POWER SYST SUZHOU
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical adhesion between the ceramic layer and the base material prepared by this traditional diaphragm preparation method is weak, and the ceramic layer is easy to fall off during the charging and discharging process after the battery is assembled, thus affecting the performance of the battery and restricting it. Large-scale applications in the field of power and energy storage

Method used

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

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Effect test

preparation example Construction

[0024] like figure 1 The preparation method of the shown diaphragm comprises the following steps:

[0025] S10. Coating the ceramic material on both surfaces of the organic substrate by physical vapor deposition technology to obtain a diaphragm, the diaphragm is an organic diaphragm coated with a ceramic material, and the physical vapor deposition technology is magnetron sputtering, ion beam sputtering, pulsed At least one of laser deposition, atomic layer deposition, and electron beam evaporation.

[0026] The ceramic material is α-Al 2 O 3 (α-alumina), SiO 2 (Silica), TiO 2 (Titanium dioxide), ZrO 2 (zirconia) or BN (boron nitride). Among them, porous α-Al 2 O 3 It has the characteristics of capillary liquid absorption. The surface of the diaphragm is made of ceramic material, which can improve the permeability of the diaphragm at low temperature. At the same time, because the ceramic has a certain strength, the low temperature mechanical properties of the diaphragm ...

Embodiment 1

[0049] α-Al with a particle size of 7nm 2 o 3 Coated on both surfaces of the organic substrate by atomic layer deposition technology, the organic substrate is a PP / PE / PP three-layer composite separator, PE is the middle layer, and both sides are PP.

[0050] LiMn 0.7 Fe 0.3 PO 4 、LiNi 0.8 co 0.15 Al 0.05 o 2 , SP, KS-6, and PVDF were mixed with NMP (N-methylpyrrolidone) according to the mass ratio of 46.45:46.45:2.05:2.05:3 to form a uniform slurry, and then coated on aluminum foil to control the compaction density. 3.0, the density of one side is 110g / cm 2 , dried and rolled to obtain the positive electrode sheet.

[0051] Mix artificial graphite, SP, KS-6, CMC and SBR with deionized water according to the mass ratio of 93.8:1:1:1.7:2.5 to form a uniform slurry, and then coat it on copper foil to control the compaction density is 1.35, and the density of one side is 60g / cm 2 , dried and rolled to form a negative electrode sheet.

[0052] The selected composition i...

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Abstract

The invention relates to a preparation method of a diaphragm and a lithium ion battery with the diaphragm prepared through the preparation method of the diaphragm. The preparation method of the diaphragm includes the following steps that the two surfaces of an organic base material are coated with a ceramic material through the physical vapor deposition technology, the diaphragm is obtained, the diaphragm is an organic diaphragm coated with the ceramic material, and the physical vapor deposition technology is at least one of magnetron sputtering, ion beam sputtering, pulsed laser deposition, atomic layer deposition and electronic beam evaporation. The technological process of the physical vapor deposition technology is simple, the environment is improved, no pollution is caused, fewer consumables are adopted, and a formed film is uniform and dense; the binding force of the ceramic material and the organic base body is high, the mechanical adhesion of the ceramic material layer and the base material in the prepared diaphragm is high, and application is promoted. In addition, the lithium ion battery is designed and comprises the diaphragm prepared through the preparation method of the diaphragm.

Description

technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a method for preparing a separator and a lithium ion battery comprising the separator prepared by the above method. Background technique [0002] As one of the new energy sources, lithium-ion batteries are widely used in electronic products, electric vehicles and implantable medical devices due to their advantages of high energy density and long service life. However, the low-temperature charge and discharge performance of lithium-ion batteries is relatively poor, which limits their application in special fields such as aviation, aerospace, special communications, polar expeditions and military. For example, the current low-temperature performance of lithium-ion batteries, especially in low-temperature environments below -40 °C, is mainly manifested in low battery fast charge capacity, sharp decline in discharge capacity and drop in discharge voltage platform. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 黄碧英孙喜梅李艳
Owner LONG POWER SYST SUZHOU
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