Manufacturing method of high-energy-density aluminum shell lithium ion battery

Abstract

The invention provides a manufacturing method of a high-energy-density aluminum shell lithium ion battery, which comprises the following steps: S1, preparing a positive plate and a negative plate, assembling an aluminum shell battery, keeping insulation between the aluminum shell and the positive plate and the negative plate of the battery, and then injecting a pre-lithiation electrolyte into the aluminum shell battery; S2, connecting the aluminum shell with the positive electrode of an external power supply, connecting the negative plate with the negative electrode of the external power supply, and charging with small current for pre-lithiation; and S3, removing the pre-lithiated electrolyte, injecting a functional electrolyte, and then performing activation and sealing to obtain the high-energy-density aluminum shell lithium ion battery. According to the method, in-situ lithium pre-embedding of the negative electrode of the lithium ion battery can be accurately controlled, so that lithium consumption in the processes of negative electrode film forming and the like in the first-time charging process is compensated, gram volume exertion of the positive electrode material in the actual lithium ion battery is improved, and due to the fact that additional auxiliary electrodes or electrode materials do not need to be added in the lithium pre-embedding process, andoperation is simple and convenient. And the capacity and the energy density of the lithium ion battery can be improved.

Description

technical field

[0001] The invention relates to the technical field of high energy density lithium batteries, in particular to a method for manufacturing a high energy density aluminum shell lithium ion battery. Background technique

[0002] Lithium-ion batteries stand out among secondary batteries due to their excellent charge and discharge performance, and are widely used in consumer electronics, electric transportation, energy storage and other fields. High energy density is an important development direction of lithium-ion batteries.

[0003] The development and application of new materials is an important way to improve the energy density of lithium-ion batteries. In recent years, people have developed a series of high-voltage, high-capacity positive electrode materials, and high-capacity negative electrode materials. Among them, the silicon-based negative electrode materials (silicon oxide / carbon composite negative electrode materials, nano-silicon / carbon composite n...

Examples

Embodiment 1

[0033] Positive electrode sheet preparation: a mixture of lithium manganese oxide and nickel cobalt lithium manganese oxide (NCM523) with a mass ratio of 7:3 is used as the positive electrode active material, and conductive agent, polyvinylidene fluoride (PVDF), nitrogen methyl pyrrolidone (NMP) Mix and stir evenly according to a certain ratio, prepare positive electrode slurry, and then apply it on porous aluminum foil. The distance between the small holes is less than 1cm, and the diameter of the small holes is less than 0.3mm. When coating, some areas are left blank along the length direction. It is used as the current lead-out part of the full-tab electrode sheet, and the positive electrode sheet with one end blank is obtained after drying, rolling, and sheeting;

[0034] Negative electrode sheet preparation: Mix graphite negative electrode material, conductive agent, sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain propo...

Embodiment 2

[0043] 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, part of the area is left blank when coating, and is used as the current lead-out part of the pole piece. 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 pole piece. The thickness of the single fabric layer on the sheet, the distance between the small holes is less than 1cm, and the diameter of the small holes is less than 0.3mm, and then the surface material layer is restored to a flat state by rolling, and the positive electrode sheet is obtained by sheeting;

[0044] Negative electrode sheet preparation: mix silicon-based composite negative electro...

Embodiment 3

[0053] Positive electrode sheet preparation: Lithium iron phosphate, conductive agent, polyvinylidene fluoride (PVDF), nitrogen methyl pyrrolidone (NMP) are mixed in a certain proportion and stirred evenly to make a positive electrode slurry, and then coated on a porous aluminum foil. The distance between them is less than 1cm, and the diameter of the small holes is less than 0.3mm. When coating, some areas are left blank along the length direction, which is used as the current lead-out part of the full tab pole piece. After drying, rolling, and sheeting, one end is left blank. White positive plate;

[0054] Negative electrode sheet preparation: Mix graphite negative electrode material, conductive agent, sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain proportion and stir evenly to prepare negative electrode slurry, and then apply it to On the porous copper foil, the distance between the small holes is less than 1cm, and the...

technical field

[0001] The invention relates to the technical field of high energy density lithium batteries, in particular to a method for manufacturing a high energy density aluminum shell lithium ion battery. Background technique

[0002] Lithium-ion batteries stand out among secondary batteries due to their excellent charge and discharge performance, and are widely used in consumer electronics, electric transportation, energy storage and other fields. High energy density is an important development direction of lithium-ion batteries.

[0003] The development and application of new materials is an important way to improve the energy density of lithium-ion batteries. In recent years, people have developed a series of high-voltage, high-capacity positive electrode materials, and high-capacity negative electrode materials. Among them, the silicon-based negative electrode materials (silicon oxide / carbon composite negative electrode materials, nano-silicon / carbon composite n...

Examples

Embodiment 1

[0033] Positive electrode sheet preparation: a mixture of lithium manganese oxide and nickel cobalt lithium manganese oxide (NCM523) with a mass ratio of 7:3 is used as the positive electrode active material, and conductive agent, polyvinylidene fluoride (PVDF), nitrogen methyl pyrrolidone (NMP) Mix and stir evenly according to a certain ratio, prepare positive electrode slurry, and then apply it on porous aluminum foil. The distance between the small holes is less than 1cm, and the diameter of the small holes is less than 0.3mm. When coating, some areas are left blank along the length direction. It is used as the current lead-out part of the full-tab electrode sheet, and the positive electrode sheet with one end blank is obtained after drying, rolling, and sheeting;

[0034] Negative electrode sheet preparation: Mix graphite negative electrode material, conductive agent, sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain propo...

Embodiment 2

[0043] 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, part of the area is left blank when coating, and is used as the current lead-out part of the pole piece. 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 pole piece. The thickness of the single fabric layer on the sheet, the distance between the small holes is less than 1cm, and the diameter of the small holes is less than 0.3mm, and then the surface material layer is restored to a flat state by rolling, and the positive electrode sheet is obtained by sheeting;

[0044] Negative electrode sheet preparation: mix silicon-based composite negative electro...

Embodiment 3

[0053] Positive electrode sheet preparation: Lithium iron phosphate, conductive agent, polyvinylidene fluoride (PVDF), nitrogen methyl pyrrolidone (NMP) are mixed in a certain proportion and stirred evenly to make a positive electrode slurry, and then coated on a porous aluminum foil. The distance between them is less than 1cm, and the diameter of the small holes is less than 0.3mm. When coating, some areas are left blank along the length direction, which is used as the current lead-out part of the full tab pole piece. After drying, rolling, and sheeting, one end is left blank. White positive plate;

[0054] Negative electrode sheet preparation: Mix graphite negative electrode material, conductive agent, sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR) and deionized water in a certain proportion and stir evenly to prepare negative electrode slurry, and then apply it to On the porous copper foil, the distance between the small holes is less than 1cm, and the...