Ultrathin secondary battery and preparation method thereof

A secondary battery, ultra-thin technology, applied in the field of electrochemistry, can solve the problems of difficult to thin, difficult to roll, easy to roll the pole piece, etc.

Active Publication Date: 2015-05-20
HUNAN GAOYUAN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims at the deficiencies of the existing ultra-thin secondary batteries, and provides an ultra-thin secondary battery and a preparation method thereof; it solves the existing pro

Method used

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  • Ultrathin secondary battery and preparation method thereof
  • Ultrathin secondary battery and preparation method thereof
  • Ultrathin secondary battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0088] Preparation of conductive layer slurry: Super-P and PVDF were dissolved in NMP (N,N-dimethylpyrrolidone) at a mass ratio of 90:10 to form a stable conductive layer slurry.

[0089] Preparation of the separator: use PP as the substrate (7), coat the prepared conductive layer slurry on one side of the substrate, and dry in an oven to obtain a functional separator. The thickness of the conductive layer after drying is 10 μm. For the convenience of expression, the side coated with the functional coating is represented as A side (that is, the side with the conductive layer (8) is A side), and the other side is B side.

[0090] Preparation of positive electrode membrane: LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2(nickel cobalt lithium manganese oxide), Super-P (conductive carbon black), PVDF (polyvinylidene fluoride) mixed with NMP (N,N-dimethylpyrrolidone) at a mass ratio of 94:2:4 and stirred evenly to obtain a positive electrode The slurry coated on the pole piece has a solid content ...

Embodiment 2

[0100] Preparation of conductive layer slurry: carbon nanotubes and PVDF were dissolved in NMP (N,N-dimethylpyrrolidone) at a mass ratio of 90:10 to form a stable conductive layer slurry.

[0101] Preparation of the separator: use non-woven fabric as the substrate (7), coat the prepared conductive layer slurry on one side of the substrate, and dry it in an oven to obtain a functional separator. The thickness of the conductive layer after drying is 10 μm, for the convenience of expression, the side coated with the functional coating is represented as the A side (that is, the side with the conductive layer (8) is the A side), and the other side is the B side.

[0102] Preparation of cathode diaphragm: LiCoO 2 (Lithium cobaltate), CNT (carbon nanotube), PVDF (polyvinylidene fluoride) are mixed with NMP (N,N-dimethylpyrrolidone) according to the mass ratio of 98:1:1, and stirred evenly to obtain the positive electrode sheet coating Cloth slurry, the slurry viscosity is 72%. Then...

Embodiment 3

[0112] Preparation of conductive layer slurry: carbon nanotubes and PVDF were dissolved in NMP (N,N-dimethylpyrrolidone) at a mass ratio of 90:10 to form a stable conductive layer slurry.

[0113] Preparation of diaphragm: use PE as the substrate (7), coat the prepared conductive layer slurry on one side of the substrate, and dry in an oven to obtain a functional diaphragm. The thickness of the conductive layer after drying is 10 μm. For the convenience of expression, the side coated with the functional coating is represented as A side (that is, the side with the conductive layer (8) is A side), and the other side is B side.

[0114] Preparation of positive electrode membrane: LiFePO 4 (lithium iron phosphate), Super-P (conductive carbon black), PVDF (polyvinylidene fluoride) are mixed with NMP (N,N-dimethylpyrrolidone) at a mass ratio of 91:3:6, and stirred evenly to obtain a positive electrode Sheet-coated slurry with a solids content of 45%. Then the slurry is evenly coat...

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Abstract

The invention relates to an ultrathin secondary battery and a preparation method thereof, and belongs to the field of electrochemistry. The thickness of the ultrathin secondary battery is 0.3-1.0mm. The ultrathin secondary battery comprises a diaphragm, a positive electrode membrane and a negative electrode membrane, wherein the positive electrode membrane and the negative electrode membrane are respectively adhered to two sides of the diaphragm and directly contact the diaphragm; the diaphragm consists of a substrate and a conductive layer; the conductive layer is positioned on one side of the substrate and directly contacts the positive electrode membrane. The preparation method comprises the following steps: firstly, respectively coating the front and back sides of the diaphragm with positive electrode slurry and negative electrode slurry according to set sizes, drying and rolling, thereby obtaining the diaphragm with the positive electrode membrane and the negative electrode membrane; secondly, pressing, thereby enabling a positive electrode current collector and a negative electrode current collector to respectively tightly contact the positive electrode membrane and the negative electrode membrane; finally, packaging by using a package membrane according to design size, performing vacuum dewatering and electrolyte injection in sequence, subsequently sealing, activating, forming, packaging for the second time, and performing volume division, thereby obtaining the ultrathin secondary battery.

Description

technical field [0001] The invention relates to an ultra-thin secondary battery and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] As a green battery, lithium-ion secondary battery has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. With the rapid development of cards, the scope of application is also expanding, more and more information needs to be stored, and the security requirements are getting higher and higher. Traditional magnetic cards can no longer meet the above requirements. With the rapid development of smart bank cards, ID cards, electronic paper, and smart traffic management cards, the scope of application is also expanding, and the demand and requirements for batteries are also getting higher and higher, especially the thickness and safety performance of batteries. higher requirements. [0003] The current commercialized u...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M2/02H01M10/058H01M10/0525H01M50/119H01M50/124H01M50/403H01M50/449H01M50/46H01M50/528
CPCY02E60/10Y02P70/50
Inventor 唐杰雄杨勇李阳春
Owner HUNAN GAOYUAN BATTERY
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