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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 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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  • Abstract
  • Description
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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, the conductivity in the sheet is high, and the direct conductivity of the sheet is low, which affects the rate performance; at the same time, the structural change of graphene in the process of charging and discharging leads to a decrease in the life of the pole piece, which affects the life of the device.

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

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preparation example Construction

[0030] S2. Preparation of electrochemical capacitors

[0031] Take two graphene electrode sheets, which are the positive electrode sheet and the negative electrode sheet, and stack them in the order of positive electrode sheet, diaphragm, and negative electrode sheet to form a battery cell, then seal the battery cell with the battery case, and then install it on the battery case Inject the electrolyte into the battery casing through the liquid injection port, seal the liquid injection port, and obtain an electrochemical capacitor.

[0032] Preferably, in this electrochemical capacitor, its electrolyte adopts BMIMBF 4 , EMIMTFSI plasma liquid, or conventional superelectric electrolyte TEABF 4 / AN.

[0033] 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, a...

Embodiment 1

[0043] Preparation of graphene electrode sheet:

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

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

[0046] The slurry is evenly coated on both sides of aluminum foil with a thickness of 12um, and then the pole piece is compacted with a roller press, ...

Embodiment 2

[0050] Preparation of graphene electrode sheet:

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

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

[0053] The slurry is evenly coated on both sides of aluminum foil with a thickness of 12um, and then the pole p...

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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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