High-temperature type polymer lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and polymers, applied in the direction of secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of difficult to guarantee battery performance, difficult to discharge normally, short cycle life, etc., and achieve surface density and pressure Moderate solid density, lower battery impedance, and good cycle life

Active Publication Date: 2018-09-28
CHONGQING VDL ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of existing polymer lithium-ion batteries is difficult to guarantee in high-temperature environments, and usually only meets the requirements of storage at 60°C and cycle life at 45°C
However, when stored in an environment of 85°C, the battery is difficult to discharge normally, and even gasses, and the cycle life is also short in an environment of 60°C.
This cannot meet the needs of equipment used in high-temperature regions and high-temperature environments

Method used

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  • High-temperature type polymer lithium ion battery and preparation method thereof
  • High-temperature type polymer lithium ion battery and preparation method thereof
  • High-temperature type polymer lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The lithium cobalt oxide D10 of the positive electrode sheet is 11 μm, and the specific surface area is: 0.2m 2 / g

[0036] The artificial graphite D10 of the negative electrode sheet is 13 μm, and the specific surface area is: 0.9m 2 / g.

[0037] The base film of the separator is a polyethylene porous film, the thickness of the base film is 12 μm, the mixed coating is a mixture of aluminum oxide and polyvinylidene fluoride, the mass ratio of the two is 1:1, and the thickness of the coating is 3 μm , the coating corresponds to the positive side.

[0038] The lithium salt of the electrolyte is LiPF6, and the content of the lithium salt is 1.0mol / L;

[0039] The mass ratio of each component of the carbonate mixture is ethylene carbonate (EC): propylene carbonate (PC): diethyl carbonate (DEC): ethylmethyl carbonate (EMC)=40:15:30:15 ;

[0040] The additive content accounts for 5.5% of the total mass of the electrolyte, and the mass ratio of various additives is: fluor...

Embodiment 2

[0052] The lithium cobalt oxide D10 of the positive electrode sheet is 11 μm, and the specific surface area is: 0.2m 2 / g;

[0053] The artificial graphite D10 of the negative electrode sheet is 13 μm, and the specific surface area is: 0.9m2 / g.

[0054] The base film of the separator is a polyethylene porous film, the thickness of the base film is 12 μm, the mixed coating is composed of a mixture of aluminum oxide and polyvinylidene fluoride, the thickness of the coating is 3 μm, and the coating corresponds to the positive electrode surface.

[0055] The lithium salt of the electrolyte is LiPF6, and the content of the lithium salt is 1.0mol / L;

[0056] The mass ratio of each component of the carbonate mixture is ethylene carbonate (EC): propylene carbonate (PC): diethyl carbonate (DEC): ethylmethyl carbonate (EMC)=40:15:30:15 ; The carbonate mixture accounts for 81.5% of the total mass of the electrolyte.

[0057] The additive content accounts for 5.5% of the total mass of...

Embodiment 3

[0069] The lithium cobalt oxide D10 of the positive electrode sheet is 11 μm, and the specific surface area is: 0.2m 2 / g;

[0070] The artificial graphite D10 of the negative electrode sheet is 13 μm, and the specific surface area is: 0.9m 2 / g.

[0071] The base film of the separator is a polyethylene porous film, the thickness of the base film is 12 μm, the mixed coating is composed of a mixture of aluminum oxide and polyvinylidene fluoride, the thickness of the coating is 3 μm, and the coating corresponds to the positive electrode surface.

[0072] The lithium salt of the electrolyte is LiPF6, and the content of the lithium salt is 1.0mol / L;

[0073] The mass ratio of each component of the carbonate mixture is ethylene carbonate (EC): propylene carbonate (PC): diethyl carbonate (DEC): ethylmethyl carbonate (EMC)=40:15:30:15 ;

[0074] The additive content accounts for 6.5% of the total mass of the electrolyte, and the mass ratio of various additives is: fluoroethylene ...

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Abstract

The invention discloses a high-temperature type polymer lithium ion battery and a preparation method thereof. The lithium ion battery mainly comprises a positive plate, a negative plate, a porous isolation membrane and electrolyte; the positive plate comprises lithium cobaltate, polyvinylidene fluoride, carbon nano-tube, and carbon black; the negative plate comprises synthetic graphite, sodium carboxyl cellulose, butadiene styrene rubber and carbon black; the porous isolating membrane is hybrid coated isolating membrane; the elecgtrolyte is composed of lithium salt, carbonate mixture and additives. The lithium cobaltate and the synthetic graphite have large D10 and small specific area, the side effect under the high-temperature condition can be weakened, and the battery performance is stabilized; the isolating membrane adopts the ceramic / polyvinylidene fluoride hybrid coated isolating membrane, thereby facilitating the battery molding and the thermal stability of the battery; the additive composition used by the electrolyte has the positive and negative film-forming protection functions, so that the dosage is low, the battery impedance can be reduced, and the cycle performance is convenient.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a high-temperature polymer lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in automotive, energy storage, digital and other fields due to their environmental friendliness, high energy density, and good cycle performance. The energy density of polymer lithium-ion batteries is higher than that of liquid lithium-ion batteries, and the battery shape can be customized according to needs, which is especially popular in the digital field. The performance of existing polymer lithium-ion batteries is difficult to guarantee in high-temperature environments, and usually only meets the requirements of storage at 60°C and cycle life at 45°C. However, when stored at 85°C, the battery is difficult to discharge normally, and even gasses, and the cycle life is short at 60°C. This cannot meet the needs of equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587H01M4/525H01M4/587H01M2/16H01M10/0567H01M50/411
CPCH01M4/525H01M4/587H01M10/0525H01M10/0567H01M10/0587H01M2004/021H01M50/411Y02E60/10Y02P70/50
Inventor 朱传钦周显茂
Owner CHONGQING VDL ELECTRONICS
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