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Method for preparing positive electrode composite material

A composite material and cathode technology, which is applied in the field of graphene/activated carbon/sulfur composite cathode material preparation, can solve the problems of disrupting the ecological balance of the earth, resource shortage mining costs, battery capacity attenuation, etc., and achieves improved utilization and stable discharge. The effect of good cycle performance and increased discharge capacity

Inactive Publication Date: 2017-05-31
青岛亨迈新能源有限公司
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Problems solved by technology

[0003] In the current society, energy crisis and environmental issues are a global hot topic. With the excessive exploitation of traditional energy sources such as coal and oil, it has caused an increasingly serious shortage of resources and continuous increase in mining costs; at the same time, the pollution caused by the use of traditional energy The problem is also becoming more and more prominent, which seriously damages the ecological balance of the earth
Because the graphene sheet structure is easy to aggregate and the pore size is large, sulfur is easy to preferentially accumulate in the macropores. During the charging and discharging process, polysulfides dissolve in the electrolyte, diffuse to the anode and react with metal lithium, resulting in a decrease in battery capacity. fast decay

Method used

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Effect test

Embodiment 1

[0028] (1) Utilize the Hummers method to prepare graphene oxide; (Hummers method is an existing public method, which will not be described in detail here), take 20mg graphene oxide and add 10mL deionized water, ultrasonic 1h, get 2mg / mL graphene oxide suspension;

[0029] (2) 3 mg of acid-treated activated carbon (acid treatment process is: 1, the activated carbon of 5 g is added to 50 mL of concentrated nitric acid with a concentration of 68% by mass, and the mixed suspension is placed in a magnetic stirrer and stirred for 1 h ; 2. Centrifuge the suspension obtained in 1 to obtain acid-treated activated carbon; 3. Wash the treated activated carbon with water until the pH value is 7, and finally place it in a drying oven at 60 ° C for 10 h) and add it to 1.5 mL of graphite oxide olefin suspension (2mg / mL), sonicate at room temperature for 10min, then stand at room temperature for 10min;

[0030] (3) Take 1mL of the mixed solution obtained in (2), then add 20mg of 1mol / L sodiu...

Embodiment 2

[0037] (1) Utilize Hummers method to prepare graphene oxide, take 40mg graphene oxide and add 10mL deionized water, ultrasonic 3h, obtain 4mg / mL graphene oxide suspension;

[0038] (2) 3 mg of acid-treated activated carbon was added to 1.5 mL of graphene oxide suspension (4 mg / mL), ultrasonicated at room temperature for 10 min, and then left to stand at room temperature for 10 min;

[0039] (3) Take 1mL of the mixed solution obtained in (2), then add 60mg of 1mol / L sodium ascorbate solution, then place it in an oil bath, and heat it at 100°C for 120min to obtain a graphene hydrogel;

[0040] (4) the graphene hydrogel obtained in (3) is placed in a drying oven and dried at 90° C. for 6 hours to obtain a graphene / activated carbon composite material;

[0041] (5) Fully grind the graphene / activated carbon composite material obtained in (4) with a mass ratio of 1:1 for 3 hours, use a ball mill for grinding, and then put it in a tube furnace for calcination at 170°C for 5 hours unde...

Embodiment 3

[0045] (1) Graphene oxide was prepared by the Hummers method; 20 mg of graphene oxide was added to 10 mL of deionized water, and ultrasonicated for 1 hour to obtain a 2 mg / mL graphene oxide suspension;

[0046] (2) 3 mg of acid-treated activated carbon was added to 1.5 mL of graphene oxide suspension (2 mg / mL), ultrasonicated at room temperature for 10 min, and then left to stand at room temperature for 10 min;

[0047] (3) Take 1mL of the mixed solution obtained in (2), then add 20mg of 2mol / L sodium ascorbate solution, then place it in an oil bath, and heat it at 100°C for 120min to obtain a graphene hydrogel;

[0048] (4) the graphene hydrogel obtained in (3) is placed in a drying box and dried at 60° C. for 12 hours to obtain a graphene / activated carbon composite material;

[0049] (5) Graphene / activated carbon and sulfur mass ratio obtained in (4) are fully ground 3h at 1:1, and the ball mill is selected for grinding, and then placed in a tube furnace and calcined at 155°...

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Abstract

The invention relates to a method for preparing a positive electrode composite material. The method comprises the following steps: adding activated carbon subjected to acid treatment to graphene oxide suspension to obtain a mixed solution; and then adding a sodium ascorbate solution to obtain graphene hydrogel; and drying the graphene hydrogel, mixing and grinding the dry graphene hydrogel with sulfur, calcining the mixture at 150-200 DEG C for 3-15h in an argon atmosphere to obtain a graphene / activated carbon / sulfur positive electrode composite material. The method for preparing the positive electrode material of lithium-sulfur batteries provided by the invention has the advantages that the used raw materials are cheap and easy to obtain, the preparation process is simple, the flow is short, the process is easy to control, and the industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a graphene / activated carbon / sulfur composite cathode material for lithium ion batteries. [0002] technical background [0003] In the current society, energy crisis and environmental issues are a global hot topic. With the excessive exploitation of traditional energy sources such as coal and oil, it has caused an increasingly serious shortage of resources and continuous increase in mining costs; at the same time, the pollution caused by the use of traditional energy Problems are also becoming increasingly prominent, seriously disrupting the ecological balance of the earth. Therefore, in this era of energy revolution, people urgently need to find and develop green and effective new energy sources to meet the needs of rapid social development. Lithium-sulfur battery (theoretical specific capacity is 1675mAh / g, specific energy is 25...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 张永光王新
Owner 青岛亨迈新能源有限公司
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