Preparation method of para-aramid/PP non-woven fabric lithium ion battery diaphragm

A lithium-ion battery and para-aramid technology, which is applied in secondary batteries, battery components, circuits, etc., can solve problems such as poor performance, achieve the effects of increasing porosity, good fluidity, and avoiding pore blockage
CN110620205AActive Publication Date: 2019-12-27山东精恒科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
山东精恒科技有限公司
Publication Date
2019-12-27

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Abstract

The invention provides a preparation method of a para-aramid / PP non-woven fabric lithium ion battery diaphragm and relates to the technical field of a para-aramid / PP non-woven fabric lithium ion battery diaphragm. The method is advantaged in that PP non-woven fabric is selected as a substrate material, pores in the PP non-woven fabric are occupied by pore forming agent, then the PP non-woven fabric is immersed into para-aramid pulp, curing is conducted in a sulfuric acid coagulating bath, the pore forming agent is heated and sublimated, the pores are vacated, and the diaphragm thickness film is determined through hot pressing. Compared with the prior art, the method is advantaged in that the PP non-woven fabric is directly coated with the para-aramid polymerization solution for reinforcement, the process is completed in one step, and influence of external factors is small; the porosity of the para-aramid / PP non-woven fabric lithium ion battery diaphragm is effectively improved due to occupation of the pore-forming agent; the sulfuric acid solution is adopted as a coagulating bath, so the high porosity of the PP non-woven fabric layer is not only maintained, but also the pore structure of the PP non-woven fabric layer is maintained, and uniformity and consistency of diaphragm pores of the para-aramid fiber layer are realized.
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Description

technical field

[0001] The invention relates to the technical field of para-aramid / PP non-woven lithium-ion battery diaphragms, in particular to a preparation method of para-aramid / PP non-woven lithium-ion battery diaphragms. Background technique

[0002] In mobile phones, computers and electric vehicles, batteries that can be charged and discharged many times are mainly lithium-ion batteries. The key to charging and discharging lithium-ion batteries lies in the regular movement of lithium ions between the positive and negative electrodes; specifically, when charging, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. In addition to the positive electrode, negative electrode and electrolyte, there is also a diaphragm inside the lithium-ion battery. The function of the diaphragm is to separate the positive and...

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
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