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

Lithium ion battery diaphragm with high wettability and high flame retardance and preparation method thereof

A lithium-ion battery, wettability technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of low mechanical strength, unfavorable charging and discharging of lithium-ion batteries, poor liquid absorption and liquid retention capacity, etc. The effect of mechanical strength and heat shrinkage performance, enhancement of liquid absorption and liquid retention capacity, and improvement of liquid absorption and liquid retention capacity

Active Publication Date: 2022-04-12
JIANGSU HORIZON NEW ENERGY TECH CO LTD
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyolefin separator is currently the most widely used lithium battery separator, but in the existing market, there are some disadvantages: ①Low ionic conductivity, which makes the internal resistance of the battery larger, which is not conducive to the lithium-ion battery in the case of high rate. charging and discharging; ②The mechanical strength is low, the puncture resistance is poor, and it is easy to be punctured, causing the positive and negative electrodes of the battery to contact and short circuit, resulting in thermal runaway; ③The melting point of polyolefin materials is low, and the separator is prone to rupture when the battery has thermal runaway The thermal runaway is aggravated by the film, causing the battery to burn or even explode; ④The specific surface area is low, and the ability to absorb and retain liquid is poor
For the problems of low ionic conductivity, poor mechanical properties and poor liquid absorption and retention capacity of polyolefin separators, the current main solution is to apply ceramic coatings on one or both sides of polyolefin separators; For the problem of poor thermal performance, by coating the surface of the polyolefin separator with a high-temperature resistant ceramic coating, the closure of the diaphragm can be delayed to 150°C, but the closure temperature of 150°C cannot completely avoid the short circuit of the lithium battery at high temperature and the resulting failure. spontaneous combustion

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 diaphragm with high wettability and high flame retardance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) SnO 2 Nanotube @ Polydopamine Derived Porous Carbon @KHCO 3 Preparation of:

[0050] 1.1. MnCO 3 Preparation of nanowires:

[0051] Take 45mL deionized water, add 0.56mmol potassium permanganate and 2.12mmol manganese chloride under the condition of constant stirring, ultrasonic treatment for 20min; add 0.13g cetyltrimethylammonium bromide, 0.52mL 30% hydrogen peroxide , 1.28mmol lithium carbonate, stirred for 36min; transferred to a 50mL high-pressure reactor lined with polytetrafluoroethylene, and kept at a temperature of 180°C for 20h; naturally cooled to room temperature, filtered, and the precipitate was collected. , fully washed with deionized water, and dried for 12 hours to obtain MnCO 3 Nanowires;

[0052] 1.2. SnO 2 Preparation of nanotubes:

[0053] Take 78mL deionized water, add 0.1gMnCO 3 Nanowires, magnetically stirred for 40 minutes, ultrasonically dispersed for 120 minutes; added 0.4381g tin chloride pentahydrate, 0.3498g sodium hydroxide and...

Embodiment 2

[0067] (1) SnO 2 Nanotube @ Polydopamine Derived Porous Carbon @KHCO 3 Preparation of:

[0068] 1.1. MnCO 3 Preparation of nanowires:

[0069] Take 45mL deionized water, add 0.56mmol potassium permanganate and 2.12mmol manganese chloride under the condition of constant stirring, ultrasonic treatment for 15min; add 0.13g cetyltrimethylammonium bromide, 0.52mL 30% hydrogen peroxide , 1.28mmol lithium carbonate, stirred for 32min; transferred to a 50mL high-pressure reactor lined with polytetrafluoroethylene, and kept at a temperature of 175°C for 18h; naturally cooled to room temperature, filtered, and the precipitate was collected. , fully washed with deionized water, and dried for 12 hours to obtain MnCO 3 Nanowires;

[0070] 1.2. SnO 2 Preparation of nanotubes:

[0071] Take 78mL deionized water, add 0.1gMnCO 3 Nanowires, magnetically stirred for 30 minutes, ultrasonically dispersed for 100 minutes; added 0.4381g tin chloride pentahydrate, 0.3498g sodium hydroxide and...

Embodiment 3

[0085] (1) SnO 2 Nanotube @ Polydopamine Derived Porous Carbon @KHCO 3 Preparation of:

[0086] 1.1. MnCO 3 Preparation of nanowires:

[0087] Take 45mL of deionized water, add 0.56mmol of potassium permanganate and 2.12mmol of manganese chloride under constant stirring, and ultrasonically treat it for 25min; add 0.13g of cetyltrimethylammonium bromide, 0.52mL of 30% hydrogen peroxide , 1.28mmol lithium carbonate, stirred for 40min; transferred to a 50mL high-pressure reactor lined with polytetrafluoroethylene, and kept at a temperature of 185°C for 22h; naturally cooled to room temperature, filtered, and the precipitate was collected. , fully washed with deionized water, and dried for 12 hours to obtain MnCO 3 Nanowires;

[0088] 1.2. SnO 2 Preparation of nanotubes:

[0089] Take 78mL deionized water, add 0.1gMnCO 3 Nanowires, magnetically stirred for 50 minutes, ultrasonically dispersed for 150 minutes; added 0.4381g tin chloride pentahydrate, 0.3498g sodium hydroxid...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lithium ion battery diaphragm with high wettability and high flame retardance and a preparation method thereof, the lithium ion battery diaphragm comprises a base film and a coating layer, and the coating layer comprises the following components: SnO2 nanotube coated polydopamine derived porous carbon coated KHCO3, a dispersing agent, a thickening agent, an adhesive and a wetting agent. According to the invention, SnO2 nanotube-poly-dopamine-derived porous carbon-KHCO3 is introduced on the surface of the battery diaphragm, and the mechanical strength and thermal shrinkage performance of the prepared diaphragm are improved by using the excellent performance of the SnO2 nanotube-poly-dopamine-derived porous carbon-KHCO3, the mutual crosslinking among different nanotubes and the synergistic effect among multiple layers of components of the SnO2 nanotube-poly-dopamine-derived porous carbon-KHCO3; wherein the polydopamine-derived porous carbon enhances the conductivity, is beneficial to enhancing the rapid transmission of lithium ions, and cooperates with the hollow nanotubes to increase the specific surface area and enhance the liquid absorption and retention capability of the diaphragm; kHCO3 is heated and decomposed to generate water vapor and CO2, latent heat is absorbed, oxygen and combustible gas are diluted, the KHCO3 cooperates with polydopamine derived porous carbon, combustion is prevented, potassium carbonate generated through decomposition is resistant to high temperature, the open fire resistance is improved, and flame retardance of the composite diaphragm is achieved.

Description

technical field [0001] The invention relates to the technical field of battery diaphragms, in particular to a lithium-ion battery diaphragm with high wettability and high flame retardancy and a preparation method thereof. Background technique [0002] As a new type of secondary battery, lithium battery has the advantages of high energy density and long cycle life. Its application range is continuously expanding, and it is widely used in portable electronic devices, energy storage and power vehicles, especially with the rapid development of the new energy industry. , Lithium batteries are increasingly used in power vehicles. As an important part of lithium batteries, the separator can effectively prevent positive and negative electrodes from contacting and avoid short circuits, which has a very important impact on the safety of lithium batteries. Therefore, the performance improvement and safety requirements of lithium batteries have higher requirements on the performance of...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/446H01M50/403H01M50/489H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 李帆张立斌沈亚定贡晶晶
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD