Difunctional coated diaphragm for lithium ion batteries and preparation method thereof

A lithium-ion battery, dual-function technology, applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as no better, increase production costs and production processes, and achieve High-efficiency operation, improved high-temperature resistance, and high-capacity effects

Inactive Publication Date: 2018-06-12
河南惠强新能源材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has introduced many additional raw material components, increased production cost and production process
However, there is no better solution for the generation of iron ions during the cycle, and the process of dissociation to the negative electrode and reduction to iron.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A dual-functional coated diaphragm for lithium-ion batteries, with dry-process single-drawn polypropylene porous diaphragm (5um in thickness and 30% porosity) as the base material, and kaolin particles (0.2um in particle size) as the main raw material The paint is coated on the surface of the substrate, and the thickness of the formed coating is 3um.

[0023] The preparation method of the above-mentioned bifunctional coated diaphragm for lithium-ion batteries, the specific steps are:

[0024] (1) Evenly mix kaolin particles, polyvinylidene chloride binder, polyvinylpyrrolidone dispersant and N-methylpyrrolidone solvent in a mass ratio of 1:0.5:0.05:5, and stir for 0.5h to obtain a relatively uniform coating Cloth slurry;

[0025] (2) Apply the coating slurry prepared in step (1) to one side of the dry-process single-drawn polypropylene porous diaphragm by scraping, and dry at 60°C to obtain kaolin particles as the main raw material coating Lithium-ion battery diaphrag...

Embodiment 2

[0029] A dual-functional coated diaphragm for lithium-ion batteries, with dry-process double-drawn polypropylene porous diaphragm (thickness 60um, porosity 50%) as the base material, and analcite particles (particle size 1um) as the main raw material The paint is coated on the surface of the substrate, and the thickness of the formed coating is 20um.

[0030] The preparation method of the above-mentioned bifunctional coated diaphragm for lithium-ion batteries, the specific steps are:

[0031] (1) Mix analzem particles, polytetrafluoroethylene binder, polyvinyl alcohol and N,N-dimethylformamide dispersant solvent in a mass ratio of 1:2:0.5:25, stir for 2 hours, and obtain a relatively Uniform coating slurry;

[0032] (2) Apply the coating slurry prepared in step (1) to both sides of the dry-process double-drawn polypropylene porous diaphragm by roll coating, and dry at 80°C to obtain analcite particles as the main raw material coating. The lithium-ion battery separator of clo...

Embodiment 3

[0034] A kind of bifunctional coated separator for lithium-ion battery, based on wet-process polyethylene porous separator (thickness is 20um, porosity 42%) as base material, hydroxyapatite particles (particle size is 0.5um) The paint as the main raw material is coated on the surface of the substrate, and the thickness of the formed coating is 4um.

[0035] The preparation method of the above-mentioned bifunctional coated diaphragm for lithium-ion batteries, the specific steps are:

[0036] (1) Evenly mix hydroxyapatite particles, polyacrylic acid binder, polyvinylpyrrolidone dispersant and N-methylpyrrolidone solvent in a mass ratio of 1:1:0.1:10, and stir for 1 hour to obtain a relatively uniform coating Cloth slurry;

[0037] (2) Apply the coating slurry prepared in step (1) to one side of the wet-process polyethylene porous diaphragm by spraying, and dry at 70°C to obtain hydroxyapatite particles as the main raw material coating Lithium-ion battery diaphragm, that is, th...

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Abstract

The invention relates to a difunctional coated diaphragm for lithium ion batteries and a preparation method thereof. With a porous polyolefin diaphragm as a substrate, inorganic matter particles witha cation exchange function and high-temperature stability are used for being coated on one side or both sides of the porous polyolefin diaphragm. The coated lithium ion battery diaphragm has the following advantages: on one hand, because of the high thermal stability of the inorganic matter, a polymer is melted under high temperature, while the existence of the inorganic matter keeps the integrityof the lithium ion battery diaphragm, and therefore the high-temperature resistance of the diaphragm can be improved; in addition, the inorganic matter coated on the surface can adsorb divalent ironions released in the cyclic process of the lithium iron phosphate of the anode of a lithium ion battery, preventing the divalent iron ions from being diffused into the cathode and reduced into iron element to cause battery micro-short-circuiting, consequently, the capacity of the lithium ion battery can be kept for a long time, and safety problems, such as spontaneous combustion, which can be possibly caused by micro-short-circuiting are prevented.

Description

technical field [0001] The invention belongs to the field of new energy materials, and specifically designs a bifunctional coated separator for lithium ion batteries and a preparation method thereof. Background technique [0002] In the past few decades, the development of lithium-ion batteries has transformed from small-scale device energy storage to power batteries, which has continuously improved people's lifestyles. In lithium-ion batteries, the separator is a very important component, which can prevent the contact between the positive electrode and the negative electrode, and also has the function of allowing electrolyte ions to pass through. Its structure and performance determine the interface structure, internal resistance, etc. of the battery. , which directly affects the capacity, cycle and safety performance of the battery. For a long time, the safety of lithium-ion batteries has attracted much attention, especially the research and development of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M50/403H01M50/417H01M50/431H01M50/446H01M50/457
CPCH01M50/40H01M50/409H01M50/403H01M50/463Y02E60/10
Inventor 唐浩林王红兵童星马兴玉王锐
Owner 河南惠强新能源材料科技股份有限公司
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