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A kind of lithium ion secondary battery and preparation method thereof

A secondary battery and lithium-ion technology, applied in the field of electrochemistry, can solve problems such as unproposed applications, and achieve the effect of improving safety performance and high safety performance

Active Publication Date: 2017-07-11
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention patent application with the publication number CN102634862A proposes to prepare ultra-high molecular weight polyethylene (UHMWPE) fibers by electrospinning, but does not propose the application of such fibers in lithium-ion secondary batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of electrospinning mixture: the density is 0.915 ~ 0.94g cm -3Low-density polyethylene (LDPE) was stirred and dissolved in xylene at 75° C. to prepare a solution with a mass ratio of LDPE of 9.5%, which was filtered and used for later use.

[0035] The preliminary steps of preparing the positive pole piece are the same as those of the comparative example. After the positive pole piece of the comparative example is prepared, the composite mixed solution obtained above is sprayed on the surface of the positive pole piece by electrospinning to form a nanofiber coating. The process parameters of electrospinning are as follows: spinning temperature is 75°C, spinning voltage is 30kV, flow rate is 5mL / h, spinning distance is 20cm, and pole piece transmission rate is 120cm / min. The resulting coating has a thickness of 15 μm, a porosity of 70%, and an areal density of 7 mg cm -2 . After being dried and rolled, the positive electrode sheet is obtained.

[0036] The...

Embodiment 2

[0038] Preparation of electrospinning mixture: the density is 0.915 ~ 0.94g cm -3 Low-density polyethylene (LDPE) was stirred and dissolved in xylene at 80° C. to prepare a solution with a mass ratio of LDPE of 8.5%, which was filtered and used for later use.

[0039] The preliminary steps of preparing the negative electrode sheet are the same as those of the comparative example. After the negative electrode sheet of the comparative example is prepared, the composite mixture obtained above is sprayed on the surface of the negative electrode sheet by electrospinning to form a nanofiber coating. The process parameters of electrospinning are as follows: spinning temperature is 80°C, spinning voltage is 40kV, flow rate is 6mL / h, spinning distance is 20cm, and pole piece transmission rate is 200cm / min. The resulting coating has a thickness of 20 μm, a porosity of 75%, and a surface density of 5 mg cm -2 . After being dried and rolled, the negative electrode sheet is obtained.

...

Embodiment 3

[0042] Preparation of the electrospinning mixed solution: stirring and dissolving butanethritol in ethanol at 50° C. to prepare a solution with a mass ratio of 12%, and filtering it for later use.

[0043] The preliminary steps of preparing the positive pole piece are the same as those of the comparative example. After the positive pole piece of the comparative example is prepared, the composite mixed solution obtained above is sprayed on the surface of the positive pole piece by electrospinning to form a nanofiber coating. The process parameters of electrospinning are as follows: spinning temperature is 50°C, spinning voltage is 30kV, flow rate is 10mL / h, spinning distance is 20cm, and pole piece transmission rate is 300cm / min. The obtained coating has a thickness of 10 μm, a porosity of 70%, and a surface density of 5 mg cm -2 . After being dried and rolled, the positive electrode sheet is obtained.

[0044] The preparation of the negative pole piece, the diaphragm, the el...

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Abstract

A lithium-ion secondary battery and a preparation method thereof, the lithium-ion secondary battery comprises a shell, a positive pole piece, a negative pole piece, an electrolyte, a diaphragm spaced between the positive pole piece and the negative pole piece, and a membrane formed on the positive pole A nanofiber coating containing a phase-change energy storage material on the surface of the pole piece and / or the negative pole piece. The preparation method of the lithium-ion secondary battery of the present invention is based on the assembly and preparation process of the conventional lithium-ion secondary battery, adding a process step, that is: spraying the phase-change energy storage material on the electrode pole piece by electrospinning nanofiber coating. With the lithium ion secondary battery of the present invention, when the battery is in an abnormal state, the temperature of the battery can be clamped within a certain range, effectively improving the safety performance of the battery, thereby meeting the safety requirements of the lithium ion secondary battery, especially the power battery .

Description

technical field [0001] The invention relates to a lithium ion secondary battery and a preparation method thereof, belonging to the technical field of electrochemistry. Background technique [0002] At present, due to the advantages of high energy and long life, lithium-ion secondary batteries are widely used as power sources for various portable electrical appliances. In recent years, with the pressure of environmental pollution and energy scarcity, lithium-ion secondary batteries for power such as electric vehicles have received great attention and research. However, lithium-ion secondary batteries contain highly reactive electrode materials and flammable and flammable electrolytes, which mean greater safety hazards while having higher energy density. When the battery is under certain abuse conditions, such as overcharge, short circuit, high temperature, collision, etc., chemical exothermic reactions may occur between the internal materials of the battery. When the heat g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62H01M10/058
CPCY02E60/10Y02P70/50
Inventor 卢世刚翟传鑫庞静王泽李文成杨允杰靳尉仁
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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