Lithium ion battery cell with sandwich structure, electric pile, and preparation methods thereof

A lithium-ion battery, sandwich technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as the inability of the diaphragm to transmit lithium ions independently, leakage of organic liquid electrolytes, safety hazards, etc., to solve cooling problems and improve contact. , the effect of reducing manufacturing costs

Pending Publication Date: 2021-11-19
SOUTH CHINA UNIV OF TECH +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diaphragm used in this composite electrode cannot independently transmit lithium ions, and liquid electrolytes need to be added, and organic liquid electrolytes are prone to leakage, combustion, explosion, and short circuit, and there are very large safety hazards.

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 cell with sandwich structure, electric pile, and preparation methods thereof
  • Lithium ion battery cell with sandwich structure, electric pile, and preparation methods thereof
  • Lithium ion battery cell with sandwich structure, electric pile, and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of positive electrode slurry: positive active material lithium iron phosphate, conductive agent Super-P, binder PVDF-HFP, solid electrolyte Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 Disperse in NMP (N-methylpyrrolidone) at a mass ratio of 9:0.5:0.4:0.1, stir magnetically for 6 hours, and sonicate for 2 hours to prepare a positive electrode slurry with a solid content of 400 mg / mL;

[0048] (4) Coating the positive electrode slurry on the organic-inorganic composite solid electrolyte (PVDF-HF P / LiTFSI / Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 ) one side of the film, dried in a vacuum oven at 80°C for 12 hours to obtain a metal-free current collector composite positive electrode;

[0049] (5) Preparation of the negative electrode slurry: the negative active material artificial graphite, conductive agent carbon nanotubes, binder PVDF-HFP, solid electrolyte Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 Disperse in NMP (N-methylpyrrolidone) at a mass ratio of 9: 0.5:0.4:0.1, stir ma...

Embodiment 2

[0053] (1) Polish the surface of the metal lithium sheet with a diameter of 15.6 mm and a thickness of 0.45 mm with sandpaper, and then the prepared electrolyte slurry (PEO / LiTFSI / Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 ) uniformly coated on the surface of the lithium sheet, dried to completely evaporate the solvent, and obtain a solid electrolyte composed of metal lithium;

[0054] (2) Preparation of positive electrode slurry: positive active material lithium manganese phosphate, conductive agent graphene, binder PEO, solid electrolyte Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 Disperse in DMF (N,N-dimethylformamide) at a mass ratio of 8:1:0.6:0.4, stir magnetically for 6 hours, and sonicate for 1 hour to prepare a positive electrode slurry with a solid content of 450 mg / mL;

[0055] (3) Evenly coat the positive electrode slurry on the organic-inorganic composite solid electrolyte (PEO / LiTFSI / Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 ) on the other side of the film, vacuum drying at 70...

Embodiment 3

[0059] (1) Preparation of positive electrode slurry: the positive active material nickel-cobalt-manganese ternary material, conductive agent Ketjen black, binder PAN, solid electrolyte Li 7 La 3 Zr 2 o 12 Disperse in NMP (N-methylpyrrolidone) at a mass ratio of 8.5:0.7:0.4:0.4, stir magnetically for 6 hours, and sonicate for 3 hours to prepare a positive electrode slurry with a solid content of 480 mg / mL;

[0060] (4) Coating the positive electrode slurry on the polymer solid electrolyte (PAN / LiClO 4 ) side, dried in a vacuum oven at 80°C for 12 hours to obtain a metal-free current collector composite positive electrode;

[0061] (5) Preparation of negative electrode slurry: negative active material carbon fiber, conductive agent carbon black, binder PAN, solid electrolyte Li 7 La 3 Zr 2 o 12 Disperse in NMP (N-methylpyrrolidone) at a mass ratio of 8.5:0.7:0.4:0.4, stir magnetically for 6 hours, and sonicate for 3 hours to prepare a negative electrode slurry with a soli...

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 cell with a sandwich structure, an electric pile and preparation methods thereof. The battery cell comprises a positive active material, a solid electrolyte and a negative active material; and the electric pile is formed by stacking the battery cell and a bipolar plate. The preparation method of the battery cell comprises the following steps: directly coating two surfaces of a solid electrolyte membrane with prepared positive electrode slurry and negative electrode slurry respectively, and drying to obtain the battery cell. The lithium ion battery cell provided by the invention does not need to use a metal current collector to bear positive and negative electrode materials, so that the cost of the lithium ion battery can be greatly reduced, and the energy density and power density of the lithium ion battery are improved; and the problems of overhigh cost, insufficient safety, difficulty in cooling high-power batteries and the like of the existing lithium ion battery can be solved, and the lithium ion battery cell and the electric pile of the invention have a wide application prospect in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium-ion battery cell with a "sandwich" structure, a stack and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output power, long cycle life, and light weight, so they are widely used as power sources for various electronic products and electric vehicles. [0003] Lithium-ion batteries currently widely used use liquid electrolytes containing organic solvents, which lead to the risk of burning, explosion, and environmental pollution of lithium-ion batteries. In order to solve this outstanding problem, a large number of research and development work on all-solid-state lithium-ion batteries based on solid electrolytes have been carried out at home and abroad in recent years. [0004] Chinese invention patent CN108695558B discloses an all-solid-state battery core and a high-...

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): H01M10/0585H01M4/62H01M10/0562H01M10/0565H01M10/613H01M10/653H01M10/654H01M10/6556H01M10/0525
CPCH01M10/0585H01M10/0525H01M4/625H01M10/0562H01M10/0565H01M10/613H01M10/654H01M10/653H01M10/6556Y02P70/50Y02E60/10
Inventor 廖世军刘燕妮
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap