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Graphene electrode plate, and preparation method and application thereof

A graphene electrode and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of reduced electrode life and electrochemical performance, powder drop, and poor adhesion. Achieve good electrolyte resistance, less contact resistance, and reduce irreversible consumption

Inactive Publication Date: 2014-06-04
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When graphene is used as an active material, due to the layered structure of graphene has a certain rigidity, the adhesion with the current collector is not very good, and the phenomenon of powder falling will occur after coating and drying treatment, which will lead to the life of the electrode sheet and the Reduced electrochemical performance

Method used

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  • Graphene electrode plate, and preparation method and application thereof
  • Graphene electrode plate, and preparation method and application thereof

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preparation example Construction

[0030] In the preparation process of the above-mentioned graphene electrode sheets, the alginate is sodium alginate and / or potassium alginate, and the two stereoisomers L-guluronic acid (G section) and The ratio G / M of D-mannuronic acid (section M) is less than or equal to 1.5, and the calcium impurity contained in the alginate is less than or equal to 0.3%. If the G segment content in the molecular sequence is too high, on the one hand, the homopolymeric G segment structure is prone to chelation with calcium impurities, making the alginic acid chains tightly bound and synergistically stronger, and finally forms a gel; on the other hand, The brittleness of sodium alginate (or potassium) with high G / M ratio is enhanced after film formation, and the processing of pole pieces is more difficult; moreover, the impedance of pole pieces prepared with high G / M ratio sodium (or potassium) is higher than that of low G / M ratio of sodium alginate (or potassium) prepared pole piece, which...

Embodiment 1

[0044] According to the mass percentage, add 90% conductive agent and 10% sodium alginate binder into water, stir evenly to form a conductive layer slurry, and evenly coat the conductive layer slurry on one side of aluminum foil with a coating thickness of 3 μm Thick, then put it into an oven, dry at 80°C for 12 hours, and then apply the same process to the other side of the aluminum foil to coat a conductive layer, in which water accounts for 60% of the total slurry weight.

[0045] According to the mass percentage, 90% graphite, 5% conductive agent, and 5% alginate binder are added into water, stirred evenly to form a graphene slurry, and the graphene slurry is evenly coated on the conductive layer, The coating thickness is 50 μm, then put it into an oven, and dry it at 80 ° C for 12 hours, and then apply the graphene slurry layer on the other side of the conductive layer by the same process to obtain a graphene electrode sheet; wherein water occupies 60% of the total slurry...

Embodiment 2

[0048] According to the mass percentage, add 99% conductive agent and 1% potassium alginate binder into water, stir evenly to form a conductive layer slurry, and evenly coat the conductive layer slurry on one copper foil with a coating thickness of 10 μm thick, then put it into an oven, dry at 100°C for 6 hours, and then apply the same process on the other side of the copper foil to coat a conductive layer, in which water accounts for 60% of the total slurry weight.

[0049] According to the mass percentage, add 96% graphene, 2% conductive agent, and 2% potassium alginate binder into water, stir evenly to form a graphene slurry, and evenly coat the graphene slurry on the conductive layer , the coating thickness is 300 μm thick, then put it into an oven, dry at 100 ° C for 6 hours, and then apply the same process to the other side of the conductive layer to coat the graphene slurry layer to obtain a graphene electrode sheet, wherein Water was 60% by weight of the total slurry. ...

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Abstract

The invention belongs to an electrochemical material and discloses a graphene electrode plate, and a preparation method and application thereof. The preparation method of the graphene electrode plate includes: preparing a conductive layer, which is made of materials of alginate and a conductive agent, on a current collector; and preparing a graphene layer, which is made of materials of graphene, a conductive agent and the alginate, on the surface of the conductive layer which undergoes a drying process and performing a dying process and then obtaining the graphene electrode plate. In the preparation method for the graphene electrode plate, uniform carboxyl groups are distributed evenly on a chain structure of the alginate and the carboxyl groups in the alginate are capable of forming chemical bonds with hydroxyl groups on different graphene-plate layers so that a bonding force between the graphene plate layers is reinforced and conductivity between the graphene plate layers is improved and thus the rate performance is improved; and low reaction activity between the alginate and an electrolyte, and an excellent electrolyte resistance characteristic reduce irreversible consumption of the electrolyte on the surfaces of cathode active material particles in a cyclic process so that the long cyclic performance of a cell is ensured.

Description

technical field [0001] The invention relates to the field of electrochemical electrode materials, in particular to a graphene electrode sheet and its preparation method and application. Background technique [0002] Supercapacitors, also known as Electrochemical Capacitors or Electric Double Layer Capacitors, are a new type of energy storage element between traditional capacitors and batteries. Compared with traditional capacitors, they have Higher specific capacitance and energy density, and higher power density compared with batteries; due to the advantages of fast charging and discharging, no pollution to the environment and long cycle life, supercapacitors are expected to become a new type of green energy in this century . Electrode materials are an important part of supercapacitors and a key factor affecting the capacitance performance and production cost of supercapacitors. Therefore, research and development of high-performance, low-cost electrode materials is an imp...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/38H01G11/28
CPCY02E60/13
Inventor 周明杰钟玲珑王要兵刘大喜
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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