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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 the power line are It cannot pass through aluminum foil and copper foil, which will slow down the area and reaction speed of the electrochemical reaction of the electrode, increase the internal resistance of the battery, and increase the calorific value during the charging and discharging process of the battery

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

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preparation example Construction

[0063] see figure 2 , the present invention simultaneously provides a kind of preparation method of above-mentioned high-power lithium-ion secondary battery, and it comprises the following steps:

[0064] m. Preparation of positive electrode green sheet: 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, apply them on the aluminum foil, and dry them Form a positive electrode 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 conduction holes on the aluminum foil, and forming positive electrode pores corresponding to the conduction holes on the positive electrode material layer;

[0066] o. Preparing the positive electrode sheet: rolling the punched positive electrode blank,...

Embodiment 1 04215-5

[0076] Embodiment one 104215-5Ah50C battery

[0077] Positive electrode binder preparation: Measure and weigh 3 parts of PVDF and 80 parts of nitrogen methylpyrrolidone NMP solvent, and fully stir until PVDF is completely dissolved.

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

[0079] Negative electrode binder preparation: Measure and weigh 1.6 parts of CMC and 100 parts of pure water, stir well until CMC is completely dissolved, then add 2.4 parts of SBR, stir until uniformly dispersed.

[0080] Negative electrode slurry preparation: 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 surface density of negative electro...

Embodiment 2

[0084] Example 2: 853496-2200mAh50C battery

[0085] Positive electrode binder preparation: Measure and weigh 3 parts of PVDF and 80 parts of nitrogen methylpyrrolidone NMP solvent, and fully stir 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, and 2 parts of conductive graphite, add the prepared positive electrode binder solution, and stir evenly.

[0087] Negative electrode binder preparation: Measure and weigh 1.6 parts of CMC and 100 parts of pure water, stir well until CMC is completely dissolved, then add 2.4 parts of SBR, stir until uniformly dispersed.

[0088] Negative electrode slurry preparation: 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 surface density of negative elect...

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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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