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A kind of positive plate of lithium ion capacitor and preparation method thereof

A lithium-ion and positive electrode technology, applied in the field of capacitors, can solve the problems of poor rate performance and cycle stability of the positive electrode, large difference in specific gravity, and unsuitability for large-scale industrial production.

Active Publication Date: 2016-03-30
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, when preparing electrode slurry, the specific gravity of porous carbon material or conductive polymer and lithium-rich compound (such as lithium cobaltate) is very different, it is difficult to form a stable and uniform slurry, resulting in difficulty in slurry coating, so it is not suitable for large-scale industrial production
Moreover, the rate performance and cycle stability of the positive electrode prepared according to the existing method are poor

Method used

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  • A kind of positive plate of lithium ion capacitor and preparation method thereof
  • A kind of positive plate of lithium ion capacitor and preparation method thereof
  • A kind of positive plate of lithium ion capacitor and preparation method thereof

Examples

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preparation example Construction

[0025] The embodiment of the present invention provides a method for preparing a positive electrode sheet of a lithium ion capacitor with simple procedures, easy controllable conditions, and high production efficiency by adopting secondary coating. The technological process of the preparation method of the lithium ion capacitor positive plate is as follows: figure 1 shown, see also figure 2 , including the following steps:

[0026] S1: Prepare active material slurry, positive electrode slurry and obtain positive electrode current collector matrix 1;

[0027] S2: coating the active material slurry on the surface of the positive electrode current collector substrate 1, and drying to form the active material slurry layer 2;

[0028] S3: coating the positive electrode slurry on the surface of the active material slurry layer 2 again, and drying, cold pressing, and secondary drying to obtain the positive electrode sheet of the lithium ion capacitor;

[0029] Wherein, the active...

Embodiment 1

[0060] A kind of positive plate of lithium ion capacitor, its structure is as figure 2 As shown, the current collector aluminum foil body 1 is included, and the active material layer 2 and the positive electrode material layer 3 are sequentially stacked and bonded on the surface of the current collector aluminum foil body 1 . Wherein, the thickness of the active material layer 2 is 15 μm, and the thickness of the positive electrode material layer 3 is 80 μm.

[0061] The above-mentioned lithium ion capacitor positive plate coating steps are as follows:

[0062] S11: Preparation of active material slurry: make slurry with graphene, conductive carbon black, and binder polyvinylidene fluoride (PVDF) at a mass ratio of 85:10:5; preparation of positive electrode slurry: lithium cobaltate , conductive carbon black, and adhesive PVDF are mixed evenly in a mass ratio of 95:3:2.

[0063] S12: Coating the active material slurry on the surface of the current collector aluminum foil bo...

Embodiment 2

[0067] A lithium ion capacitor positive plate, its structure is the same as the lithium ion capacitor positive plate structure in embodiment 1, as figure 2 shown.

[0068] The lithium ion capacitor positive plate coating step refers to the above-mentioned embodiment 1, and the difference with embodiment 1 is: the coating amount of the active material slurry is 4mg / cm 2 , the coating amount of positive electrode slurry is 4mg / cm 2 .

[0069] The positive electrode sheet of the lithium ion capacitor prepared in this example was subjected to a peel strength test, and the test results are shown in Table 1 below.

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Abstract

The invention provides a lithium ion capacitor anode plate and a production method thereof. The lithium ion capacitor anode plate comprises an anode current collector base body and an active material layer and an anode material layer which are sequentially overlapped and combined on one surface of the anode current collector base body. The production method includes steps: preparing active material slurry and anode slurry and obtaining the anode current collector base body; coating the active material slurry on the surface of the anode current collector base body and drying the active material slurry to form an active material slurry layer; and coating the anode slurry on the surface of the active material slurry layer and performing drying, cold pressing and secondary drying to obtain the lithium ion capacitor anode plate. The lithium ion capacitor anode plate is strong in electrical conductivity and stable and firm in structure. The production method of the lithium ion capacitor anode plate is simple in procedures, easy in condition control and high in production efficiency due to the fact that secondary coating is adopted.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and in particular relates to a lithium-ion capacitor positive plate and a preparation method thereof. Background technique [0002] At present, supercapacitors are widely concerned in the industry because of their advantages of high power, long life and fast charging speed, but their low voltage and low energy density limit their applications in many aspects. Supercapacitors use activated carbon as the positive electrode, while lithium ion capacitors use lithium-intercalated graphite as the negative electrode. The maximum operating voltage can be increased from 2.7v to 4.2v, and the capacity and energy are greatly improved accordingly. Therefore, lithium Ionic capacitors have wider applications. The key of lithium-ion capacitors lies in the realization of the potassium-intercalated state of the negative electrode. Various manufacturing technologies of lithium-ion capacitors have been disclose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/04H01G9/042
CPCY02E60/13
Inventor 周明杰俞兆喆王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD