Preparation method of polyethylene wax microsphere/pvdf lithium ion battery separator

A polyethylene wax and ion battery technology, which is applied in the field of lithium-ion battery diaphragm preparation, can solve the problem that the fluorine-containing electrospun fiber diaphragm does not have a thermal shutdown function, the polyolefin lithium-ion battery diaphragm has a low liquid absorption rate, and affects the battery. Power charging and discharging performance and other issues, to achieve excellent safety protection effect, good affinity effect

Inactive Publication Date: 2021-07-23
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problem that the diaphragm of commercial polyolefin lithium-ion batteries has a low liquid absorption rate. During the charging and discharging process of the battery, a high impedance is formed between the diaphragm and the plate, which affects the high-power charging and discharging performance of the battery, and has a good electrolyte. The fluorine-containing electrospun fiber separator with affinity and thermal dimensional stability does not have the problem of thermal shutdown function, and provides a preparation method of polyethylene wax microsphere / PVDF composite lithium-ion battery separator with self-shutoff function

Method used

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  • Preparation method of polyethylene wax microsphere/pvdf lithium ion battery separator
  • Preparation method of polyethylene wax microsphere/pvdf lithium ion battery separator
  • Preparation method of polyethylene wax microsphere/pvdf lithium ion battery separator

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specific Embodiment approach 1

[0053] DETAILED DESCRIPTION OF THE INVENTION A method of preparing a polyethylene wax microspheres / PVDF composite lithium-free battery diaphragm with self-turns-off function is performed in the following steps:

[0054] First, the preparation of polyethylene wax microspheres:

[0055] 1, mix the polyethylene wax and xylene, under conditions having a temperature of 80 ° C to 90 ° C, until the polyethylene wax is completely dissolved to give a polyethylene wax-xylene solution;

[0056] The mass ratio of the polyethylene wax and the volume ratio of xylene is 1 g: (15 to 25) mL;

[0057] 2, the fatty alcohol polyoxyethylene ether is added to deionized water, dissolved under conditions having a temperature of 90 ° C to 100 ° C, resulting in a surfactant solution I;

[0058] The mass ratio of the quality of the fatty alcohol polyoxyethylene ether is 1 g: (100 ~ 150) mL;

[0059] 3, add sodium dodecyl sulfate to deion water, dissolved under conditions having a temperature of 50 ° C to ...

specific Embodiment approach 2

[0078] DETAILED DESCRIPTION OF THE INVENTION Different: The present embodiment differs from the specific embodiment: The polyethylene wax molecular weight described in step one 1 is 3000 to 4000; the PVDF molecular weight described in step iich 1 is 300,000. Other as the specific embodiment.

specific Embodiment approach 3

[0079] DETAILED DESCRIPTION OF THE INVENTION 3: The present embodiment is different from one or two of the specific embodiments that the polyethylene wax is mixed with xylene in step one 1, under conditions having a temperature of 80 ° C to 85 ° C, until polyethylene wax Completely dissolve, obtaining a polyethylene wax-xylene solution; the mass ratio of the polyethylene wax and the volume ratio of xylene is 1 g: (15 to 20) mL. Others are the same as those of the specific embodiments.

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Abstract

The invention relates to a preparation method of a polyethylene wax microsphere / PVDF composite lithium-ion battery diaphragm with a self-shutoff function, and the invention relates to a preparation method of a lithium-ion battery diaphragm. The invention aims to solve the problem that the diaphragm of commercial polyolefin lithium-ion batteries has a low liquid absorption rate. During the charging and discharging process of the battery, a high impedance is formed between the diaphragm and the plate, which affects the high-power charging and discharging performance of the battery, and has a good electrolyte. Affinity and thermal dimensional stability of fluoroelectrospun fiber separators without thermal shutdown issues. Methods: 1. Preparation of polyethylene wax microspheres; 2. Preparation of electrospun PVDF fiber film; 3. Microsphere layer coated on the surface of the film. The invention is used for the preparation of the polyethylene wax microsphere / PVDF composite lithium ion battery diaphragm with self-shutoff function.

Description

Technical field [0001] The present invention relates to a method of preparing a lithium ion battery separator. Background technique [0002] Safety lithium-ion battery, generally due to overcharge, a high rate charge and discharge of heat in a short circuit, external short circuit, vibration, impact, drop, shock and other causes of loss of control. Thermal runaway lithium-ion battery, is a gradual process. In this process, the constant accumulation of internal heat, causing the temperature of the battery continues to rise, when the temperature rises to above 130 ℃, inner surface of the anode material of the battery will decompose organic solvent will react with the electrode material and exothermic, causing the temperature to further It rises and causes the cathode material and electrolyte salt decomposition intensified and release a lot of heat, this thermal runaway phenomenon, the external manifestations of combustion or explosion. Therefore, the security problem is the bottlen...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/426H01M50/44H01M50/454H01M50/489H01M50/491H01M50/497H01M10/0525H01M50/443
CPCH01M10/0525H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor崔巍巍孟庆朋王振宇石丽娜宋薇邓伟刘帅于微微
OwnerHARBIN UNIV OF SCI & TECH