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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

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; ...

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 aft...

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 af...

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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.

Description

[technical field] [0001] The invention relates to a high-rate soft-packaged lithium-ion secondary battery, in particular to a lithium-ion secondary battery used in airplane models, car models, ship model toys and electric toys. [Background technique] [0002] Many countries and regions in the world today have higher and higher requirements for environmental protection. The application range of traditional battery products such as lead-acid, nickel-cadmium, and nickel-metal hydride batteries will be more and more strictly restricted. Lithium-ion batteries are a green high-energy battery. rechargeable battery. Because it has the characteristics of high voltage, large specific energy, long charge and discharge life, stable discharge performance, relatively safe, and no pollution, it is welcomed by the society and users. Compared with batteries such as nickel-cadmium and nickel-metal hydride, lithium-ion batteries have obvious advantages. It fully embodies the superiority of h...

Claims

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Application Information

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IPC IPC(8): H01M4/80H01M4/525H01M4/58H01M4/38H01M10/058
CPCY02E60/122H01M4/525H01M4/5825H01M4/80H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李齐云陈建设李宗厚
Owner 中山市电赢科技有限公司
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