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A kind of electrochemical energy storage device and preparation method thereof

An electrochemical and energy storage technology, applied in electrical components, hybrid capacitor electrodes, circuits, etc., can solve problems such as limiting the diffusion of lithium ions and limiting the performance of graphene

Active Publication Date: 2017-06-30
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two-dimensional structure of graphene itself greatly limits the diffusion of lithium ions in the direction perpendicular to the graphene sheet, thereby limiting the performance of graphene as the negative active material of lithium-ion batteries.

Method used

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  • A kind of electrochemical energy storage device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, different from Comparative Example 2, this embodiment comprises the following steps:

[0029]Preparation of the negative electrode sheet: Porous graphene with an equivalent diameter of 20um on the sheet plane and an average sheet thickness of 30nm is selected as the active material. The average pore diameter of the porous graphene is 1um, the average hole spacing is 6um, and the hole shape is circular. ; Then weigh according to graphene: sodium carboxymethyl cellulose: styrene-butadiene rubber=96.7:1:2.3 mass relation, add deionized water and stir to obtain negative electrode slurry, be coated on the copper current collector, then through cold pressing An electrode with a coating thickness of 80um on one side is obtained, and the negative electrode sheet is obtained after processes such as stripping, welding, and gluing.

[0030] The rest are the same as those of Comparative Example 2, and will not be repeated here.

Embodiment 2

[0031] Embodiment 2, different from Embodiment 1, this embodiment includes the following steps:

[0032] The preparation of the negative plate: select the porous graphene with the equivalent diameter of the sheet plane as 20um and the average sheet thickness of 30nm as the active material, the porous graphene aperture is 0.2um, the hole spacing is 1um, and the hole shape is circular; after that Weigh according to graphene: sodium carboxymethyl cellulose: styrene-butadiene rubber=96.7:1:2.3 mass relation, add deionized water and stir to obtain negative electrode slurry, be coated on the copper current collector, then obtain single through cold pressing The electrode with a surface coating thickness of 80um is obtained after the processes of stripping, welding, and gluing, etc., to obtain the negative electrode sheet for future use.

[0033] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0034] Embodiment 3, different from Embodiment 1, this embodiment includes the following steps:

[0035] The preparation of negative plate: select the porous graphene that the equivalent diameter of sheet plane is 20um, average sheet thickness is 30nm as active material, the average pore diameter of porous graphene is 0.04um, the average pore spacing is 0.2um, and the hole shape is Round shape; then weigh according to the mass relationship of graphene: sodium carboxymethyl cellulose: styrene-butadiene rubber=96.7:1:2.3, add deionized water and stir to obtain negative electrode slurry, be coated on the copper current collector, and pass through Cold pressing to obtain an electrode with a coating thickness of 80um on one side, and the negative electrode sheet is obtained after slitting, welding, gluing and other processes.

[0036] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of energy storage, and particularly relates to an electrochemical energy storage device. The device comprises a positive plate, a negative plate, an isolation film, electrolyte and an external encapsulation material, wherein the negative plate consists of a current collector and a coating which has a thickness of h1 and comprises active substances and an adhesive; the active material at least comprises graphene, the lamellar thickness of the graphene is a, and the lamellar plane has a porous structure, the hole pitch which is the distance between the edges of two adjacent holes is d, and d*(h1 / a) is less than or equal to 50mm. The energy storage device has excellent performance since porous graphene is adopted as a negative active substance and can be used for effectively linking the electrode thickness, the graphene lamellar thickness and hole pitches (the distance between edges of two holes) in the graphene lamella.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to an electrochemical energy storage device and a preparation method thereof. Background technique [0002] Since 1991, carbon materials were creatively used in the field of lithium-ion batteries and brought revolutionary changes in this field - after multiple charge and discharge efficiently and safely, they have been widely used in mobile phones, cameras, notebooks computers and other portable appliances. Compared with traditional lead-acid, Ni-Cd, MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific gravimetric energy density, better environmental friendliness, smaller self-discharge and longer battery life. It is an ideal power supply for mobile appliances, power supplies for electric vehicles, and storage appliances for power stations in the 21st century. [0003] However, with the improvement of life taste, people put...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393H01G11/24H01G11/32H01G11/50
CPCY02E60/10Y02E60/13
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH