Composite positive electrode material, preparation method thereof and lithium air battery

A technology of composite cathode material and carbonized material, applied in the field of lithium-air battery, can solve the problems of poor catalytic activity and poor cycle stability, and achieve the effect of improving catalytic effect, strong stability and good catalytic activity

Pending Publication Date: 2019-04-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a nitrogen-doped porous carbon loaded Pd x Fe y W z The nano-alloy composite positive electrode material and its preparation method aim to solve the problems of poor catalytic activity and poor self-cycle stability of Pd as an air electrode catalyst for lithium-air batteries

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  • Composite positive electrode material, preparation method thereof and lithium air battery
  • Composite positive electrode material, preparation method thereof and lithium air battery
  • Composite positive electrode material, preparation method thereof and lithium air battery

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preparation example Construction

[0038] The embodiment of the present invention provides a method for preparing a composite positive electrode material, the composite positive electrode material is nitrogen-doped porous carbon supported Pd x Fe y W z Nano alloy, and the preparation method of the composite cathode material comprises the following steps:

[0039] S01. Provide an aqueous solution of lignin salt and an anhydrous alcohol solution of polyacrylonitrile, and mix the aqueous solution of lignin salt and the anhydrous alcohol solution of polyacrylonitrile to form a first mixed solution;

[0040] S02. Provide nano-silica powder, disperse the nano-silica powder in the first mixed solution to obtain a second mixed solution, and perform a programmed heat treatment on the second mixed solution to prepare a carbonized material Adding an etching solution to the carbonized material, etching and removing the silicon dioxide in the carbonized material, and preparing nitrogen-doped porous carbon; wherein, the pr...

Embodiment 1

[0089] A method for preparing a composite cathode material, comprising the following steps:

[0090] (1) Using tetraethyl orthosilicate as the silicon source and hexadecyltrimethylammonium bromide as the template, the traditional sol-gel and homogeneous precipitation method was used to prepare a compound with a particle size concentrated in the alkaline aqueous solution. 150-200nm SiO 2 ball.

[0091] (2) Sodium lignosulfonate is dissolved in water, stirred to form a uniform solution A, the solid content of the solution is 20%; polyacrylonitrile powder is dissolved and dispersed in dehydrated alcohol, stirred to form a uniform solution B, the solid content of the solution The content is 20%. Mix solutions A and B uniformly at a volume ratio of 10:1 to form mixed solution C.

[0092] (3) Preparation of nitrogen-doped porous carbon N / C. Take an appropriate amount of SiO in step (1) 2 Put it into a 50mL corundum porcelain boat, then take an appropriate amount of solution C i...

Embodiment 2

[0095] A method for preparing a composite cathode material, comprising the following steps:

[0096] (1) Using tetraethyl orthosilicate as the silicon source and hexadecyltrimethylammonium bromide as the template, the traditional sol-gel and homogeneous precipitation method was used to prepare a compound with a particle size concentrated in the alkaline aqueous solution. 150-200nm SiO 2 ball.

[0097] (2) Sodium lignosulfonate is dissolved in water, stirred to form a uniform solution A, the solid content of the solution is 10%; polyacrylonitrile powder is dissolved and dispersed in dehydrated alcohol, stirred to form a uniform solution B, the solid content of the solution The content is 10%. Mix solutions A and B uniformly at a volume ratio of 10:2 to form mixed solution C.

[0098] (3) Preparation of nitrogen-doped porous carbon N / C. Take an appropriate amount of SiO in step (1) 2 Put it into a 50ML corundum porcelain boat, then take an appropriate amount of solution C i...

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Abstract

The invention provides a preparation method of a composite positive electrode material, and the method comprises the following steps: mixing aqueous solution of lignin salt and anhydrous alcohol solution of polyacrylonitrile to prepare first mixed solution; dispersing nano silicon dioxide powder in the first mixed solution to obtain second mixed solution, and carrying out programmed heating treatment to prepare a carbonized material; adding etching solution into the carbonized material to prepare nitrogen-doped porous carbon; dispersing the nitrogen-doped porous carbon in deionized water or organic alcohol to prepare nitrogen-doped porous carbon solution; adding a mixed salt solution of alloy elements into the nitrogen-doped porous carbon solution to prepare third mixed solution; and adjusting the pH value of the third mixed solution to make the solution alkaline, and then adding a reducing agent, carrying out a reduction reaction, carrying out centrifugal separation, collecting a precipitate, cleaning the precipitate to be neutral, and carrying out calcination treatment in an inert atmosphere to prepare the nitrogen-doped porous carbon loaded PdxFeyWz nano-alloy composite positiveelectrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, in particular to a nitrogen-doped porous carbon loaded Pd x Fe y W z A nano-alloy composite cathode material, a preparation method thereof, and a lithium-air battery containing the composite cathode material. Background technique [0002] In recent years, the development of pure electric vehicles has become faster and faster, and at the same time, the state's support for the new energy industry has been increasing. Lithium-ion batteries, as the power system of the new energy industry, are in a state of rapid development. The capacity of traditional lithium-ion batteries is limited. Although its capacity is gradually increasing with the development of technology, it is difficult to meet the needs of consumers, which will hinder the further development of the new energy industry. Therefore, the development and application of new lithium battery systems are becoming more and more ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M12/08B82Y30/00
CPCB82Y30/00H01M4/921H01M4/926H01M12/08Y02E60/10
Inventor 林森原燕燕汪洋
Owner SHENZHEN BAK POWER BATTERY CO LTD
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