Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Composite film material for lithium battery and preparation method and application thereof

A composite film and lithium battery technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as dead lithium, consumption of electrolyte, and rupture of solid electrolyte layer

Active Publication Date: 2018-01-16
INST OF PHYSICS - CHINESE ACAD OF SCI
View PDF6 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, metal lithium as a negative electrode also has the following problems: lithium deposition is uneven during charging, and a large amount of local lithium deposition will accelerate the volume expansion, which leads to the rupture of the solid electrolyte layer (SEI); Li dendrites are formed, and dendrites easily penetrate the separator. The short circuit caused by dendrites has high chemical reaction activity, which is easy to react with the electrolyte and consume the electrolyte; and the dissolution of lithium at the root of the dendrites easily breaks the dendrites and forms dead lithium, resulting in low energy efficiency of the battery bank.
Dendrite growth cannot be effectively prevented by only using ceramic-coated diaphragm technology

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
  • Composite film material for lithium battery and preparation method and application thereof
  • Composite film material for lithium battery and preparation method and application thereof
  • Composite film material for lithium battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0107] Preparation of composite membrane materials:

[0108] (1) mixing one or more of the particles of the ion-electronic mixed conductor material, the particles of the electron conductor material, and the particles of the ion conductor material with a binder and a solvent to form a slurry;

[0109] The solvent is selected from N-methylpyrrolidone, acetonitrile, acetone, N,N-dimethylformamide, water and ethanol, and the mass fraction of the solvent in the slurry is 80%-98%, wherein, See Table 7 for the binders, solvents and their amounts used in conjunction with the ceramic conductor particles on the negative electrode side.

[0110] (2) coating the slurry prepared in step (1) on one side surface of the polymer film, drying to remove the solvent, thereby forming a conductor particle layer; and

[0111] (3) On the surface of the other side of the above-mentioned polymer film, the slurry of the coating on the positive side is coated, and the solvent is removed by drying. See ...

Embodiment 1

[0121] Embodiment 1 provides a rechargeable metal lithium battery and a solid metal lithium battery prepared therefrom. specifically,

[0122] (1) Assembling a rechargeable metal lithium battery, wherein the composite film material is used as a separator of the lithium battery, and the conductor particle layer faces the negative electrode; and

[0123] (2) Carry out charge and discharge formation on the assembled metal lithium battery.

[0124] The assembly of the simulated battery is carried out in a glove box containing argon. The material of the composite film is the base film 1 in Table 9. The positive electrode is a lithium cobaltate electrode, the counter electrode is metallic lithium, and the lithium salt is LiPF. 6 , the lithium salt concentration is 1mol / L, and the organic solvent is EC:DMC=1:1 (ie, solvent 9).

[0125] The constant current charge and discharge mode test was carried out using a charge and discharge instrument. The charge cut-off voltage was 4.2V, an...

Embodiment 2-31

[0131] Embodiments 2-31 of the present application provide a rechargeable metal lithium battery and a solid metal lithium battery prepared therefrom. specifically,

[0132] (1) Assembling a rechargeable metal lithium battery, wherein the composite film material is used as a separator of the lithium battery, and the conductor particle layer faces the negative electrode; and

[0133] (2) Carry out charge and discharge formation on the assembled metal lithium battery.

[0134] The assembly of the simulated battery was carried out in a glove box containing argon gas. The number of composite membrane materials corresponds to the base membrane 2-31 in Table 9, and the counter electrode is metal lithium. The lithium salts, solvents, additives, and positive electrode materials used are listed in Table 9. 10, wherein the lithium salt concentration is 1mol / L, and the additive concentration is 2wt%. At the same time, Table 10 also shows the operating temperature and charge and discharg...

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
The average particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Total thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a composite film material for a lithium battery. The composite film material comprises a polymer film and a conductor particle layer coating the surface of the polymer film in one side. The conductor particle layer contains one or more of particles of an ion conductor material, particles of an ion-electron mixed conductor material and particles of an electron conductor material. The invention also provides a preparation method of the composite film material and an application of the composite film material in a rechargeable metal lithium battery. The invention provides aliquid metal lithium battery and solid metal lithium battery containing the composite film material.

Description

Technical field [0001] The invention belongs to the technical fields of electrochemistry and new energy materials, and specifically relates to a composite membrane material for lithium batteries and its preparation method and application. technical background [0002] In recent years, the rapidly developing electric vehicles and energy storage industries have placed higher requirements on the energy density, cost, cyclability and safety of lithium-ion batteries. [0003] Metal lithium anode is considered to be the fourth generation anode, with a capacity of up to 3860mAh / g and a low deposition potential (-3.04V). Using metallic lithium as the negative electrode can increase the battery energy density to 300wh / kg, which can effectively alleviate the range anxiety of electric vehicles. At the same time, lithium-free positive electrodes can also be used to reduce battery costs. [0004] The core problem of metallic lithium as an anode is the infinite expansion of the anode vol...

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): H01M2/14H01M10/052H01M50/403H01M50/443H01M50/449
CPCY02E60/10
Inventor 黄杰凌仕刚李泉杨琪徐航宇李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com