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Lithium ion secondary battery containing ion liquid electrolyte

A secondary battery and ionic liquid technology, applied in the field of lithium-ion secondary batteries, can solve problems such as the inability to fundamentally eliminate safety hazards, the inability to reflect the advantages of ionic liquids, and the limited effect of electrolyte performance, so as to improve high-current performance and increase High current and high rate charge and discharge performance, performance improvement effect

Active Publication Date: 2013-01-30
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic solvents are flammable and cannot fundamentally eliminate potential safety hazards. Moreover, the effect of purely relying on organic solvents to improve electrolyte performance is limited. The effect of adding a small amount is not obvious, and the advantages of ionic liquids cannot be reflected if the amount is large.

Method used

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  • Lithium ion secondary battery containing ion liquid electrolyte
  • Lithium ion secondary battery containing ion liquid electrolyte
  • Lithium ion secondary battery containing ion liquid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Comparison of the wettability and liquid absorption of the polar porous diaphragm and the non-polar diaphragm to the ionic liquid electrolyte

[0041] Table 1 is a comparison of the physical properties of a certain polar porous separator and a PP / PE / PP three-layer separator.

[0042] Table 1

[0043]

Polar Porous Membrane MV-1

Polar Porous Membrane MV-2

PP / PE / PP diaphragm

Material

PVDF single layer

PVDF single layer

PP / PE / PP three-layer composite

thickness

22μm

25μm

20μm

internal structure

3D mesh

3D mesh

stretch hole

Air permeability*

150 seconds / 100CC

210 seconds / 100CC

400-500 seconds / 100CC

Porosity

60％

45％

43％

Aperture

0.1-1.0μm

0.1-1.0μm

0.1-0.2μm

[0044] *: Using ASTM D 737-2004 Test method for air permeability of textile fibers

[0045] Cut the diaphragm in Table 1 with a cutter (the polar porous diaphra...

Embodiment 2

[0048] Example 2 Performance comparison of ionic liquid electrolytes combined with PP / PE / PP separators and polar porous separators applied to lithium-ion secondary batteries

[0049] The present invention does not limit the structure of the lithium-ion secondary battery, which may be cylindrical, square or button-shaped. In the embodiment of the present invention, a button-type lithium-ion secondary battery (CR2025) is used. The positive electrode material of the lithium-ion secondary battery is nickel-cobalt lithium manganate ternary material, and the negative electrode material is lithium titanate.

[0050] Take the active electrode material, conductive agent (conductive carbon black), and binder (PVDF) and mix uniformly according to a certain mass ratio, add solvent N-methylpyrrolidone, further mix uniformly, and prepare a slurry with a solid content of 60%. It is then coated on an Al foil current collector, rolled after drying, and punched into circular pole pieces (Φ=1.4c...

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Abstract

The present invention provides a lithium ion secondary battery, which comprises a positive electrode, a negative electrode, a membrane and an electrolyte, wherein the electrolyte is an ion liquid electrolyte, and the membrane is a polar porous membrane. According to the present invention, combination of the ion liquid electrolyte and the polar porous membrane is applied in the lithium ion secondary battery, such that performances of the battery are significantly improved, wherein the improved battery performances comprise improved charge-discharge performance under conditions of large current and high rate, and significantly-prolonged cycle life.

Description

technical field [0001] The invention relates to a lithium ion secondary battery. Background technique [0002] Electrochemical devices include lithium batteries, lithium ion (secondary) batteries, lithium polymer batteries, electric double layer capacitors, hybrid electrochemical energy storage devices (e.g. electric double layer capacitor based electrodes combined with Faraday capacitor based electrodes) , solar cells, electrolytic devices, electrocatalytic reaction devices, etc., are not particularly limited. The present invention mainly takes the lithium ion secondary battery as an application example. [0003] Lithium-ion secondary batteries have excellent battery characteristics such as high working voltage, high energy density, and long cycle life, and are widely used in portable electronic products such as mobile phones, portable computers, video cameras, and cameras. At present, high-capacity lithium-ion secondary batteries have been tested in electric vehicles and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0568H01M2/18H01M10/0525H01M50/414H01M50/42H01M50/423H01M50/426H01M50/489H01M50/491
CPCY02E60/12H01M2/18H01M10/0567Y02E60/122H01M2300/0045H01M10/0569H01M10/0568H01M10/0525H01M10/4235H01M2/1653H01M10/0566Y02E60/10H01M50/491H01M50/414H01M50/489H01M50/423H01M50/42H01M50/426
Inventor 郑卓群顾斌王红柯了英聂云华
Owner MICROVAST POWER SYST CO LTD
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