Unlock instant, AI-driven research and patent intelligence for your innovation.

Lithium ion battery coating diaphragm and preparation method thereof

A lithium-ion battery and diaphragm technology, applied in the field of lithium-ion battery coating diaphragm and its preparation, can solve problems such as inability to transfer heat in time, hinder lithium ion transmission, and weak liquid absorption and retention capacity, so as to promote large-scale application, Improve the liquid absorption and retention capacity, increase the effect of hydrophilicity

Active Publication Date: 2022-01-07
JIANGSU HORIZON NEW ENERGY TECH CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, polyolefin coating films are commonly used as lithium-ion battery separators. Although polyolefin coating films perform well in electrochemical stability, mechanical strength, and thermal shrinkage resistance, the following defects exist in use: coating materials Alumina, boehmite, and silica are often used, and the thermal conductivity is small, so heat cannot be transferred to the inside of the battery in time, resulting in local overheating and short circuit of the battery; the ability of polyolefin coating film to absorb and retain liquid is weak, which will cause ion Low electrical conductivity; prone to clogging of coating materials, hindering lithium ion transmission

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery coating diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1: Selection of basement membrane:

[0037] Select the polypropylene film as the base film;

[0038] S2: Preparation of coating slurry:

[0039] First add 150 parts of ultrapure water, then add 1.43 parts of octadecenylamine acetate, stir at 400rpm for 10min, then add 60 parts of alumina powder, stir at 500rpm for 30min, then add 30 parts of coal tar graphitized foam carbon, 600rpm Stir for 60min, then add 1.91 parts of CMC glue, stir at 600rpm for 60min, then add 2.8 parts of cyanoacrylate-polyethylene glycol binder, stir at 500rpm for 30min, finally add 0.27 parts of polyoxyethylene surfactant, stir at 400rpm 30min, filter and remove iron, obtain coating slurry;

[0040] S3: Preparation of coated separator:

[0041] The coating slurry in step S2 is uniformly coated on the base film in step S1 by roller coating, dried and wound to obtain a lithium-ion battery coated separator.

Embodiment 2

[0043] S1: Selection of basement membrane:

[0044] Select polyethylene film as the base film;

[0045] S2: Preparation of coating slurry:

[0046] First add 150 parts of ultrapure water, then add 1.43 parts of alkyl quaternary ammonium salt, stir at 400 rpm for 10 minutes, then add 60 parts of silica powder, stir at 500 rpm for 30 minutes, then add 40 parts of high-temperature pyrolysis coal tar pitch graphitized foam carbon, Stir at 600rpm for 60min, then add 1.91 parts of CMC glue, stir at 600rpm for 60min, then add 2.8 parts of cyanoacrylate derivative binder, stir at 500rpm for 30min, finally add 0.27 part of fatty acid surfactant, stir at 400rpm for 30min, filter to remove iron , to obtain the coating slurry;

[0047] S3: Preparation of coated separator:

[0048] The coating slurry in step S2 is uniformly coated on the base film in step S1 by roller coating, dried and wound to obtain a lithium-ion battery coated separator.

Embodiment 3

[0050] S1: Selection of basement membrane:

[0051] Select polyimide film as the base film;

[0052] S2: Preparation of coating slurry:

[0053] First add 150 parts of ultrapure water, then add 1.43 parts of polyethylene glycol polyol, stir at 400rpm for 10min, then add 60 parts of magnesium hydroxide powder, stir at 500rpm for 30min, then add 20 parts of coal tar graphitized carbon foam, 600rpm Stir for 60 minutes, then add 1.91 parts of CMC glue, stir for 60 minutes at 600 rpm, then add 2.8 parts of acrylic binder, stir for 30 minutes at 500 rpm, and finally add 0.27 parts of silanol nonionic surfactant, stir for 30 minutes at 400 rpm to obtain a coating slurry ;

[0054] S3: Preparation of coated separator:

[0055] The coating slurry in step S2 is uniformly coated on the base film in step S1 by roller coating, dried and wound to obtain a lithium-ion battery coated separator.

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
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a lithium ion battery coating diaphragm and a preparation method thereof. The preparation method comprises the steps of selection of a base diaphragm, preparation of coating slurry and preparation of the coating diaphragm. Graphitized foamy carbon with high heat conductivity coefficient and high porosity is used in the preparation of the coating slurry; a porous wood source carbon material is acidized, and catalyzed at high temperature by using ferric nitrate, and pore forming is completed while Fe3C and SP2 + carbon are generated; ceramic powder is modified, the mass ratio of graphene oxide to nanometer aluminum oxide is limited, and nanometer aluminum oxide hybrid powder is compounded with micron aluminum oxide, micron boehmite, micron silicon dioxide, micron magnesium hydroxide and bacterial cellulose nanoparticles for use; and the particle sizes of the micron aluminum oxide, micron silicon dioxide and micron magnesium hydroxide are limited to improve an effective heat conduction channel in the out-of-plane direction of the diaphragm, so that the heat conductivity coefficient of the diaphragm is improved, the surface internal stress of the diaphragm is effectively reduced by adding bacterial cellulose, and the service life of a battery is prolonged.

Description

technical field [0001] The invention relates to the field of battery separators, in particular to a lithium-ion battery coated separator and a preparation method thereof. Background technique [0002] Due to the characteristics of no memory effect, slow self-discharge and high energy density, lithium-ion batteries are widely used in portable consumer electronics products; with the development and progress of society, people's storage for portable electric equipment, hybrid The demand for energy is increasing, so the requirements for lithium-ion batteries are also increasing; lithium-ion batteries include positive electrodes, separators, negative electrodes, electrolytes, and the separator plays an important role in preventing physical contact between the positive and negative electrodes. It also serves as a reservoir for the electrolyte, enabling ions to be transported between the positive and negative electrodes; as a battery separator, it should have the following characte...

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M50/403H01M50/431H01M50/434H01M50/449H01M50/451H01M10/613H01M10/653H01M10/654H01M10/0525C01B32/205
CPCH01M50/403H01M50/431H01M50/434H01M50/449H01M50/451H01M10/613H01M10/653H01M10/654H01M10/0525C01B32/205Y02E60/10H01M50/417H01M50/44H01M50/446
Inventor 张学虎张立斌沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD