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In-situ lithium supplementing and battery manufacturing method for flexible package lithium ion battery

A lithium-ion battery and a manufacturing method technology, applied in the field of lithium batteries, can solve the problems of reducing the specific capacity of positive electrode materials, residual inactive substances, and high environmental control requirements, avoiding leakage and sticking rollers, improving gram capacity, and making up Effects of Lithium Loss

Pending Publication Date: 2021-07-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditionally, lithium supplementation by electrochemical charging generally requires the electrode to be reassembled, and it will cause changes in the properties of the electrolyte and the surface of the negative electrode; , stabilized lithium powder) usually have high reactivity with moisture in the air, even with oxygen and carbon dioxide, and have high requirements for environmental control and great safety hazards; while lithium supplementation to the positive electrode usually leaves inactive substances after delithiation, thereby reducing the cost of the positive electrode material. overall specific capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Positive electrode preparation: Lithium cobalt oxide, conductive agent, polyvinylidene fluoride (PVDF), nitrogen methyl pyrrolidone (NMP) are mixed in a certain proportion and stirred evenly to make a positive electrode slurry, which is then coated on aluminum foil and baked. After drying, it is mechanically pierced from one side of the pole piece before rolling the film. The length of the thorn point passing through the aluminum foil is less than the thickness of the single fabric layer on the pole piece. The distance between the small holes is 5mm, and the diameter of the small holes is 0.2mm. , and then the surface material layer is restored to a flat state by rolling, and the positive electrode sheet is obtained by sheeting;

[0030] Negative electrode sheet preparation: Mix nano-silicon / carbon composite negative electrode material, conductive agent, sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain proportion and s...

Embodiment 2

[0039] Preparation of positive electrode sheet: Mix nickel-cobalt lithium manganese oxide (NCM523), conductive agent, polyvinylidene fluoride (PVDF), and nitrogen-methylpyrrolidone (NMP) in a certain proportion and stir evenly to make positive electrode slurry, and then apply it to On the aluminum foil, after drying, it is mechanically pierced from one side of the pole piece before rolling the film. The length of the thorn point passing through the aluminum foil is less than the thickness of the single fabric layer on the pole piece. The distance between the small holes is 7mm. The diameter is 0.3mm, and then the surface material layer is restored to a flat state by rolling, and the positive electrode sheet is obtained through sheeting;

[0040] Negative electrode sheet preparation: Mix silicon oxide / carbon composite negative electrode material, conductive agent, sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain proportion and...

Embodiment 3

[0049] Positive electrode sheet preparation: mix lithium iron phosphate, conductive agent, polyvinylidene fluoride (PVDF), and nitrogen methylpyrrolidone (NMP) in a certain proportion and stir evenly to make a positive electrode slurry, and then apply it on aluminum foil. After drying, it is mechanically pierced from one side of the pole piece before rolling the film. The length of the thorn point passing through the aluminum foil is less than the thickness of the single fabric layer on the pole piece. The distance between the small holes is 10mm, and the diameter of the small holes is 1mm. Then the surface material layer is restored to a flat state by rolling, and the positive electrode sheet is obtained through sheeting;

[0050] Negative sheet preparation: Mix graphite, conductive agent, sodium carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain proportion and stir evenly to make negative electrode slurry, and then apply it to copper...

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Abstract

The invention provides an in-situ lithium supplementing and battery manufacturing method for a flexible package lithium ion battery. The in-situ lithium supplementing and battery manufacturing method comprises the following steps: 1, preparing a positive plate and a negative plate; 2, preparing a battery roll core or a pole piece cluster from the positive pole piece, the negative pole piece and the diaphragm, wrapping the battery roll core or the pole piece cluster with a lithium-rich auxiliary electrode of which the surface is wrapped with an isolating membrane, and assembling into a soft package battery; 3, injecting electrolyte into the soft package battery obtained in the step 2, and performing pre-lithiation after primary sealing; and 4, taking out the lithium-rich auxiliary electrode after the pre-lithiation is completed, performing activation after secondary sealing, and performing vacuumizing treatment and tertiary sealing after activation. By presetting the lithium-rich auxiliary electrode, in-situ pre-lithiation of the negative electrode of the lithium ion battery is realized, so that the energy density of the lithium ion battery is improved. And lithium in the pre-lithiation process mainly comes from the pre-lithiation agent on the lithium-rich auxiliary electrode, so that the influence on the electrolyte is very small, and the pre-lithiation process is simple, safe and efficient.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an in-situ lithium supplementation of a soft-packed lithium-ion battery and a battery manufacturing method. Background technique [0002] Lithium-ion battery is an advanced secondary battery that has been favored in recent years. High energy density is its important competitiveness. That is, when storing the same energy, lithium-ion battery has the advantages of light weight and small size. It has been widely used in smart phones, notebook computers, digital electronic appliances, electric tools, electric vehicles, energy storage and other fields. [0003] The development and application of high-voltage, high-capacity positive electrodes and high-capacity silicon-based negative electrodes is an important development direction for improving the energy density of lithium-ion batteries. Among them, the capacity of silicon-based negative electrode materials (silicon oxide / ...

Claims

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Application Information

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IPC IPC(8): H01M10/0585H01M10/0587H01M4/80
CPCH01M10/0585H01M10/0587H01M4/80Y02P70/50Y02E60/10
Inventor 郭华军崔立志颜果春李新海王志兴王接喜胡启阳彭文杰张蝶郭云涛
Owner CENT SOUTH UNIV
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