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 low direct conductivity of the sheet layer, shorten the life of the pole piece, and affect the life of the device, and achieve good long-term performance. Cycling characteristics, reduction of battery swelling rate, effect of low reactivity

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

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Problems solved by technology

However, the actual prepared graphene electrode material has a low capacity due to agglomeration and other reasons. The capacity in the water system is 135F/g, and the capacity in the organic system is 99F/g, which is far from the theoretical capacity (550F/g).
Due to the sheet-like structure of graphene,

Method used

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

Examples

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Example Embodiment

[0030] S2. Preparation of electrochemical capacitors

[0031] Take two graphene electrode sheets, the positive electrode sheet and the negative electrode sheet, and assemble them into a battery cell in the order of the positive electrode sheet, the separator, and the negative electrode sheet. The battery case is then used to seal the battery cell, and then set on the battery case. Inject electrolyte into the battery case, seal the injection port, and obtain an electrochemical capacitor.

[0032] Preferably, in the electrochemical capacitor, the electrolyte is BMIMBF 4 , EMIMTFSI plasma liquid, can also use conventional super-electric electrolyte TEABF 4 / AN.

[0033] In the preparation process of the above graphene electrode sheet, the alginate is sodium alginate and / or potassium alginate, and the alginate contains two stereoisomers L-guluronic acid (section G) and The ratio G / M of D-mannuronic acid (M section) is less than or equal to 1.5, and the calcium impurity contained in the ...

Example Embodiment

[0042] Example 1

[0043] Preparation of graphene electrode sheet:

[0044] The slurry formula is based on the weight percentage of the dry material and consists of two parts: 1% sodium alginate and 99% graphene. The sodium alginate G / M is 1.5, and its number average molecular weight is about 500,000. The elastic modulus of sodium alginate The amount is 3GPa, and the content of calcium impurities is 0.1%. During the slurry configuration process, the solvent is water, which accounts for 60% of the total slurry.

[0045] First, add water and sodium alginate to the stirring grinder according to the above formula, and dissolve completely under vacuum to obtain an aqueous polymer solution. Then add graphene according to the formula, and stir evenly under vacuum at a slow speed. Filter with 150 mesh stainless steel screen to obtain the desired graphene slurry.

[0046] The slurry was evenly coated on both sides of an aluminum foil with a thickness of 12um, and then the pole pieces were co...

Example Embodiment

[0049] Example 2

[0050] Preparation of graphene electrode sheet:

[0051] The slurry formula is based on the weight percentage of the dry material and consists of 10% potassium alginate and 90% graphene. Potassium alginate G / M is 1.3, and its number average molecular weight is about 1 million. The elastic modulus of potassium alginate The amount is 4GPa, and the content of calcium impurities is 0.3%. During the slurry configuration process, the solvent is water, which accounts for 60% of the total slurry.

[0052] First, add water and potassium alginate to the stirring grinder according to the above formula, and dissolve completely under vacuum to obtain an aqueous polymer solution. Then add graphene according to the formula, and stir evenly under vacuum at a slow speed. Filter with 150 mesh stainless steel screen to obtain the desired graphene slurry.

[0053] The slurry was evenly coated on both sides of an aluminum foil with a thickness of 12um, and then the pole pieces were co...

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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 graphene slurry through use of alginate, graphene and water and then coating a current collector with the slurry and drying 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 speed, no pollution to the environment and long cycle life, electrochemical capacitors are expected to become a new type of green battery in this century. energy. Electrode materials are an important part of electrochemical capacitors and a key factor affecting the capacitance performance and production cost of electrochemical capacitors. Therefore, research and development of high-perf...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/38
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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