Battery diaphragm and preparation method and application thereof

A diaphragm and lithium-ion battery technology, applied in the field of battery diaphragm and its preparation, can solve the problems of poor lyophilicity of synthetic fibers, loss of diaphragm strength, and easy falling off of filler particles

Active Publication Date: 2018-06-15
FIBRWAY MATERIALS SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The temperature resistance of the diaphragm reaches 200°C. Although the filler particles can improve the pinholes to a certain extent and obtain a good average pore size, due to the composition of the substrate in this patent, it is inevitable that there will be large pores in the diaphragm, and the filler particles will fall off easily. Test, the separator is treated at 300°C for 1 hour, the substrate melts, and the strength of the separator is completely lost
The patent application of South China University of Technology (publication number CN104157812A) proposes to use a multi-lay

Method used

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  • Battery diaphragm and preparation method and application thereof
  • Battery diaphragm and preparation method and application thereof
  • Battery diaphragm and preparation method and application thereof

Examples

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preparation example Construction

[0089] Preparation of lithium-ion battery separator substrate

[0090] The following preparation examples 1-63 and comparative examples 1-11 only list the examples of using part of the fiber material to prepare the substrate, and other fiber materials and combinations thereof listed in the description of the present invention can also be used to prepare the substrate of the present invention; Wherein, the structure diagram of the Hydroformer double-layer hydraulic inclined wire former used in Preparation Example 1-63 of the present invention is as follows figure 2 shown.

preparation example 1

[0092] A lithium-ion battery diaphragm base material is composed of a support layer and a dense layer two-layer structure, and is prepared by the following method:

[0093] Step a: The support layer and the dense layer are mixed independently with water according to the formula shown in Table 1, deflagged, and beaten to a solid weight percentage concentration of 0.2wt%, and then the fibers of the support layer and the dense layer are respectively The raw materials are diluted with a slurry pump, wherein the fiber raw material of the support layer is diluted to a solid weight percent concentration of 0.02375wt% to obtain slurry 1; the dense layer fiber raw material is diluted to a solid weight percent concentration of 0.005wt% to obtain Slurry 2.

[0094] Step b: Slurry 1 and 2 obtained in step a are sent to the Hydroformer double-layer hydraulic inclined wire former, wherein slurry 1 enters the flow channel close to the forming wire, and the flow rate of the flow channel is 74...

preparation example 2-4、35-40、47、4

[0098] A lithium-ion battery separator base material is composed of a support layer and a dense layer with a two-layer structure. The formulations of the support layer and the dense layer are shown in Table 1, and the preparation method is the same as in Preparation Example 1.

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Abstract

The invention relates to a battery diaphragm and a preparation method and an application thereof. The diaphragm consists of a lithium ion battery diaphragm base material and an inorganic coating layer; the base material consists of a supporting layer and a compact layer; the compact layer is coated with the inorganic coating layer; the diaphragm has excellent high-temperature resistance, has certain strength after treatment at a temperature of 300 DEG C for 1h, and has the thermal shrinkage rate of less than or equal to 2%; the rigid structure stability and isolation performance of the diaphragm coating layer at a high temperature are ensured; the base material has a uniform and compact dual-layer structure, so that pin holes and a filler particle falling-off phenomena in a subsequent coating process can be controlled effectively, and requirements of the lithium ion battery diaphragm on the aspects of thermal resistance, porosity and strength can be satisfied; and therefore, the battery diaphragm is excellent in the comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery diaphragm and its preparation method and application. Background technique [0002] Separator is a key technical material to prevent battery short circuit, which will greatly accelerate the decomposition and heat generation of battery materials. Therefore, improving the thermal stability and fusing temperature of separator is very important for battery safety. [0003] Compared with the traditional polyolefin diaphragm, the ceramic coated diaphragm has a greater improvement in heat resistance and stability. There are two main types according to the substrate used. One is based on traditional polyolefin and coated with ceramic particles. A type of diaphragm has entered the market in batches; the other is a polymer non-woven fabric as a substrate, which is coated to form a ceramic diaphragm. Polyolefin stretched film (such as polyethylene (PE) or polypropylene (PP) fil...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/44H01M50/449
CPCH01M10/0525H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 胡健龙金姚运振王宜汪洋蒙玲
Owner FIBRWAY MATERIALS SCI & TECH DEV CO LTD
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