Flexible lithium secondary battery and preparation method thereof

A technology for lithium secondary batteries and flexible batteries, which is applied in the manufacture of secondary batteries, lithium storage batteries, and electrolyte storage batteries, can solve the problems that the thickness cannot meet the requirements of flexible electronic products, the peeling of rigid active material particles, and the lack of flexibility, so as to reduce the size of the battery. Thickness, high battery energy density and good flexibility

Inactive Publication Date: 2015-03-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the first aspect of the embodiment of the present invention provides a flexible lithium secondary battery to solve the problem that the existing traditional lithium secondary battery is not flexible

Method used

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  • Flexible lithium secondary battery and preparation method thereof
  • Flexible lithium secondary battery and preparation method thereof
  • Flexible lithium secondary battery and preparation method thereof

Examples

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preparation example Construction

[0048] In a second aspect, an embodiment of the present invention provides a method for preparing a flexible lithium secondary battery, comprising the following steps:

[0049] Coating the positive electrode slurry on the positive electrode current collector in an array structure, baking and pressing to obtain a positive electrode sheet, the positive electrode sheet includes a plurality of positive electrode active material layers arranged in an array on the positive electrode current collector;

[0050] Coating the negative electrode slurry on the negative electrode current collector in an array structure, and obtaining a negative electrode sheet after baking and pressing, the negative electrode sheet includes a plurality of negative electrode active material layers arranged in an array on the negative electrode current collector; The negative electrode sheet has an array gap corresponding to the positive electrode sheet; the width of the array gap is 5 mm to 50 mm;

[0051] ...

Embodiment 1

[0072] A method for preparing a flexible lithium secondary battery, comprising the following steps:

[0073] (1) Mix lithium cobalt oxide, binder PVDF and conductive carbon black at a weight ratio of 96:2:2, add a certain amount of organic solvent nitrogen methyl pyrrolidone, and use a planetary high-speed disperser to disperse to obtain positive electrode slurry. The obtained positive electrode slurry is sprayed on the aluminum foil current collector in an array structure to form a plurality of positive electrode active material layers arranged in an array on the aluminum foil current collector, and then baked and pressed to obtain the positive electrode sheet;

[0074] (2) Mix artificial graphite, binder PVDF, and conductive carbon black at a weight ratio of 95:3:2, add a certain amount of organic solvent nitrogen methyl pyrrolidone, and use a planetary high-speed disperser to disperse to obtain negative electrode slurry. The negative electrode slurry is sprayed on the coppe...

Embodiment 2

[0081] A method for preparing a flexible lithium secondary battery, comprising the following steps:

[0082] (1) Mix lithium iron phosphate, binder PVDF and conductive carbon black at a weight ratio of 96:2:2, add a certain amount of organic solvent nitrogen methyl pyrrolidone, and use a planetary high-speed disperser to disperse to obtain positive electrode slurry. The obtained positive electrode slurry is sprayed on the aluminum foil current collector in an array structure to form a plurality of positive electrode active material layers arranged in an array on the aluminum foil current collector, and then baked and pressed to obtain the positive electrode sheet;

[0083] (2) Mix artificial graphite, binder PVDF, and conductive carbon black at a weight ratio of 95:3:2, add a certain amount of organic solvent nitrogen methyl pyrrolidone, and use a planetary high-speed disperser to disperse to obtain negative electrode slurry. The negative electrode slurry is sprayed on the cop...

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Abstract

The invention provides a flexible lithium secondary battery, comprising a flexible battery shell, a battery main body and an electrolyte, wherein the battery main body is arranged in the flexible battery shell and comprises one or more sequentially stacked electrode units; each electrode unit comprises a positive plate, a flexible diaphragm and a negative plate, the positive plate, the flexible diaphragm and the negative plate are sequentially stacked, the positive plate comprises a positive current collector and a plurality of positive active material layers arranged on the positive current collector in an array type, the negative plate comprises a negative current collector and a plurality of negative active material layers arranged on the negative current collector in the array type, the positive plate and the negative plate have correspondingly arranged array interstitial vacancies, the correspondingly arranged array interstitial vacancies are applied to bending of a flexible lithium secondary battery in a plane two-dimensional direction, and the width of each array interstitial vacancy is 5-50mm. The flexible lithium secondary battery has the advantages that the integral flexibility is excellent, the energy density is high, the battery thickness, volume and mass are small, and the battery is suitable for flexible electronic products. The invention further provides a preparation method of the flexible lithium secondary battery.

Description

technical field [0001] The invention relates to the field of flexible energy storage devices, in particular to a flexible lithium secondary battery and a preparation method thereof. Background technique [0002] In order to meet people's increasing demand for miniaturization of electronic products, flexible and wearable portable electronic products have become a future development trend, such as electronic paper, rollable display screens, electronic tags and flexible sensors. However, traditional energy storage devices currently used as power supply devices generally use rigid packages, which are difficult to bend and cannot meet the future applications in flexible electronic products. Therefore, there is an urgent need for flexible energy storage devices that can cooperate with flexible electronic products to provide the required energy storage devices. [0003] Flexible energy storage devices are composed of flexible electrodes, electrolytes and flexible packaging materia...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/058
CPCH01M10/052H01M10/0583H01M10/0585Y02E60/10Y02P70/50
Inventor 王平华
Owner HUAWEI TECH CO LTD
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