High-multiplying-power flexibly-packaged lithium ion secondary battery and preparation method thereof

A secondary battery and flexible packaging technology, which is applied in secondary battery, electrolyte storage battery manufacturing, battery electrodes, etc., can solve the problems of increasing battery heat generation, slowing down the electrochemical reaction area and reaction speed of electrodes, and increasing battery internal resistance, etc. Achieve the effects of reducing heat generation, improving high-current discharge capacity, and reducing internal resistance

Active Publication Date: 2014-04-02

中山市电赢科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The existing technology basically uses aluminum foil as the positive electrode collector, copper foil as the negative electrode collector, and coats active materials on both sides of the aluminum foil and copper foil. Since the aluminum foil and copper foil are dense and have no pores, the electrolyte and...

Abstract

The invention discloses a high-multiplying-power flexibly-packaged lithium ion secondary battery. The high-multiplying-power flexibly-packaged lithium ion secondary battery comprises an outer packaging film, wherein a positive plate, an isolation film, a negative plate and electrolyte are arranged in the outer packaging film, the positive plate comprises an aluminum foil, the surface of the aluminum foil is provided with a positive material layer consisting of positive active substances, a conductive agent and a binder, the positive active substances consist of lithium cobalt oxide and lithium iron phosphate in different working voltages, the aluminum foil is provided with a plurality of positive through holes, the positive substance layer is provided with a plurality of positive pores corresponding to the through holes, and the electrolyte can pass through the positive through holes and the positive pores; the negative plate comprises a copper foil, wherein the surface of the copper foil is provided with a negative substance layer consisting of a negative active substance, a conductive agent and a binder, the negative active substance is a carbon material, the copper foil is provided with a negative through holes, the negative substance layer is provided with a plurality of negative pores corresponding to the through holes, and the electrolyte can pass through the negative through holes and the negative pores.

Application Domain

Final product manufactureElectrode carriers/collectors +1

Technology Topic

Copper foilEngineering +5

Image

Examples

Experimental program(3)

Example Embodiment

[0063] See figure 2 The present invention also provides a method for preparing the above-mentioned high-power lithium ion secondary battery, which includes the following steps:

[0064] m. Preparation of positive electrode blanks: Mix the positive electrode active material, conductive agent, binder and solvent composed of two kinds of lithium cobaltate and lithium iron phosphate with different working voltages, mix them evenly, and coat them on the aluminum foil. After drying Form a positive material layer on the surface of the aluminum foil;

[0065] n. Punching the positive electrode blank: punching a plurality of holes on the positive electrode blank, forming a plurality of positive electrode via holes on the aluminum foil, and forming a positive electrode pore corresponding to the via hole on the positive electrode material layer;

[0066] o. Preparation of the positive electrode sheet: the punched positive electrode blank is rolled and punched into a positive electrode sheet;

[0067] p. Preparation of the negative electrode blank: the carbon material, the conductive agent, the binder and the solvent are mixed, stirred evenly and then coated on the copper foil. After drying, the negative material layer is formed on the surface of the copper foil;

[0068] q. Punching the negative electrode blank: multiple holes are punched on the negative electrode blank, a number of negative electrode through holes are formed on the copper foil, and the negative electrode pores corresponding to the through holes are formed on the negative electrode material layer;

[0069] r. Preparation of the negative electrode sheet: the punched negative electrode blank is rolled and punched into a negative electrode sheet;

[0070] s. Stack and press the positive electrode sheet, the separator, and the negative electrode sheet, weld the lugs and put them into the outer packaging shell;

[0071] t. Top seal and side seal the outer packaging shell;

[0072] u. After drying, inject electrolyte into the outer packaging shell;

[0073] v. Battery formation;

[0074] w. Pumping and sealing;

[0075] x. Battery capacity.

Example Embodiment

[0076] Example one 104215-5Ah50C battery

[0077] Preparation of positive electrode binder: weigh 3 parts of PVDF and 80 parts of NMP solvent, and stir thoroughly until PVDF is completely dissolved.

[0078] Preparation of positive electrode slurry: weigh out 85 parts of lithium cobaltate, 9 parts of lithium iron phosphate, 2 parts of nano carbon powder, 1 part of conductive graphite, add the prepared positive electrode binder solution, and stir evenly.

[0079] Preparation of negative electrode binder: weigh 1.6 parts of CMC and 100 parts of pure water, fully stir until the CMC is completely dissolved, then put in 2.4 parts of SBR, and stir until the dispersion is uniform.

[0080] Preparation of negative electrode slurry: weigh 94.5 parts of carbon material, 1.5 parts of nano carbon powder, add the prepared negative electrode binder, and stir evenly.

[0081] Positive electrode coating surface density 200g/m 2 , The negative electrode coating surface density is 90g/m 2 , Rewinding after baking and drying.

[0082] Preparation of positive and negative electrode sheets: punch the coated and dried positive and negative electrode coils to punch only the area of the coated powder, with a diameter of 0.1 to 0.5 mm, and then perform roller compaction, and the positive electrode compaction density is 3.6g /cm 3; The compaction density of the negative electrode is 1.4g/cm 3;

[0083] After stacking the positive electrode with 44 layers and the negative electrode with 45 layers, assembling, drying, injecting, forming and dividing the volume That is, the production of high-rate soft-package lithium-ion secondary batteries is completed.

Example Embodiment

[0084] Example 2: 853496-2200mAh50C battery

[0085] Preparation of positive electrode binder: weigh 3 parts of PVDF and 80 parts of NMP solvent, and stir thoroughly until PVDF is completely dissolved.

[0086] Preparation of positive electrode slurry: weigh 80 parts of lithium cobaltate, 13 parts of lithium iron phosphate, 2 parts of nano carbon powder, 2 parts of conductive graphite, add the prepared positive electrode binder solution, and stir evenly.

[0087] Preparation of negative electrode binder: weigh 1.6 parts of CMC and 100 parts of pure water, fully stir until the CMC is completely dissolved, then put in 2.4 parts of SBR, and stir until the dispersion is uniform.

[0088] Preparation of negative electrode slurry: weigh 94.5 parts of carbon material, 1.5 parts of nano carbon powder, add the prepared negative electrode binder, and stir evenly.

[0089] Positive electrode coating surface density 200g/m 2 , The negative electrode coating surface density is 90g/m 2 , Rewinding after baking and drying.

[0090] Preparation of positive and negative electrode sheets: punch the coated and dried positive and negative electrode coils to punch only the area of the coated powder, with a diameter of 0.1 to 0.5 mm, and then perform roller compaction, and the positive electrode compaction density is 3.6g /cm 3; The compaction density of the negative electrode is 1.4g/cm 3;

[0091] After stacking 32 layers of positive electrode and 33 layers of negative electrode, assembling, drying, injecting liquid, forming and dividing the volume. That is, the production of high-rate soft-package lithium-ion secondary batteries is completed.

PUM

Property	Measurement	Unit
Diameter	0.1 ~ 0.5	mm
Compaction density	3.6	g/cm³
Compaction density	1.4	g/cm³

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Lower internal resistance

High-multiplying-power flexibly-packaged lithium ion secondary battery and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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