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Gradient electrode, preparation method thereof and super capacitor

An electrode and gradient technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of unstable electrode structure, easy falling off of active materials, and affecting capacitance performance, so as to reduce pulverization and falling off of active materials , reduce the binder content, improve the specific surface area and microporosity

Pending Publication Date: 2022-01-21
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional uniform electrode is prepared by mixing the active material with a homogeneous and single-content binder. This traditional electrode structure design binder will inevitably block the micropores of the active material. In order to avoid active The micro

Method used

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  • Gradient electrode, preparation method thereof and super capacitor
  • Gradient electrode, preparation method thereof and super capacitor
  • Gradient electrode, preparation method thereof and super capacitor

Examples

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Effect test

Example Embodiment

[0036] So, see figure 1 and figure 2 The present invention provides a method of preparing a gradient electrode, including:

[0037] S1: Preparation of the first electrode, the second electrode, and the third electrode;

[0038] Among them, the first electrode, the second electrode, and the third electrode are made of a binder and an active material, and the first electrode, the second electrode, and the third electrode have different adhesive content.

[0039] Specifically, the adhesive is a key portion that maintains the stable electrode structure, which acts on bonding the active material in the current collector to prevent the active substance from falling off from the current fluid. The active substance is a porous carbon material having a high surface area and a large amount of aperture. The adhesive is exemplary, PVDF, PTFE, CMC, but is not limited thereto. Preferably, the binder is PTFE.

[0040] Specifically, the first electrode is a sheet shape, and its shape is exemplary...

Example Embodiment

[0050] Example 1

[0051] (1) Preparation of a circular sheet-shaped first electrode having a PTFE content of 1 wt%, a diameter of 6 mm; a circular ring-shaped second electrode having a PTFE content of 3% by weight, an inner diameter of 8 mm; preparation The ring-shaped third electrode has a PTFE content of 5% by weight, an inner diameter of 8 mm, an outer diameter of 10 mm;

[0052] (2) Set the second electrode to the outer circumference of the first electrode, and the third electrode is arranged on the outer circumference of the second electrode, and the predeterior product is prepared;

[0053] (3) Prefillation is pressed under the pressure of 15 MPa to prepare the electrode sheet.

Example Embodiment

[0054] Example 2

[0055] (1) Preparation of circular sheet-shaped first electrodes having a PTFE content of 3 wt%, a diameter of 6 mm; a circular second electrode having a PTFE content of 4 wt%, an inner diameter of 8 mm; The ring-shaped third electrode has a PTFE content of 5% by weight, an inner diameter of 8 mm, an outer diameter of 10 mm;

[0056] (2) Set the second electrode to the outer circumference of the first electrode, and the third electrode is arranged on the outer circumference of the second electrode, and the predeterior product is prepared;

[0057] (3) Prefillation is pressed under the pressure of 15 MPa to prepare the electrode sheet.

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Abstract

The invention discloses a preparation method of a gradient electrode. The preparation method comprises the following steps: (1) preparing a first electrode, a second electrode and a third electrode; (2) combining the first electrode, the second electrode and the third electrode to obtain a pre-finished product, wherein in the pre-finished product, the second electrode is arranged on the periphery of the first electrode in a sleeving manner; the third electrode sleeves the periphery of the second electrode; or the first electrode and the second electrode are arranged on the third electrode; (3) pressing the pre-finished product on a current collector to obtain an electrode plate, wherein the first electrode, the second electrode and the third electrode are made of binders and active substances, and the binders of the first electrode, the second electrode and the third electrode are different in content. The invention also discloses a gradient electrode which is prepared by the preparation method. The invention further discloses a super capacitor which comprises the gradient electrode. The electrode is stable in structure, long in service life, low in electrode binder content and good in electrode capacitive performance.

Description

technical field [0001] The invention relates to the technical field of capacitor electrode manufacturing, in particular to a gradient electrode, a preparation method thereof, and a supercapacitor. Background technique [0002] Environmental degradation and reduction of fossil fuel energy storage due to accelerated industrialization worldwide. Therefore, it is increasingly urgent to find new, effective, green and environmentally friendly energy sources. High-efficiency energy storage components have become an important technical support and core force in the sustainable development of new energy manufacturing industries, consumer and electronics industries, and transportation industries, and have received unprecedented attention. Among numerous energy storage devices, batteries and supercapacitors have shown great potential and attracted more and more research attention. Compared with batteries, supercapacitors have the advantages of excellent power density, excellent charg...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/26H01G11/30
CPCH01G11/86H01G11/26H01G11/30Y02E60/13
Inventor 陈永张馨壬袁平韦雅庆
Owner HAINAN UNIVERSITY
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