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High-rate-performance air electrode material and application thereof

An air electrode and conductive agent technology, applied in the field of electrochemical energy storage, can solve problems such as breakthroughs, inability to modify rate performance, and large-capacity discharge blanks.

Active Publication Date: 2018-03-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above discharge capacity is still far from the theoretical capacity of the air electrode.
[0004] According to the review, the existing preparation methods of lithium-air cathode materials cannot achieve a breakthrough in rate performance modification, especially in the high-rate cycle conditions to achieve large-capacity discharge is almost blank.

Method used

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  • High-rate-performance air electrode material and application thereof
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  • High-rate-performance air electrode material and application thereof

Examples

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preparation example Construction

[0056] The invention provides a preparation method of an air electrode, comprising the steps of:

[0057] (1) Stirring and pre-dissolving the binder in a solvent to obtain a binder solution;

[0058] (2) stirring and mixing the conductive agent, the binder solution and the fluorocarbon active agent in the solvent in (1) to obtain the electrode material slurry;

[0059] (3) The electrode material slurry is sprayed on one side of the current collector through a spray gun, and the solvent is preheated at a low temperature to obtain an electrode.

[0060] In a specific embodiment, the solvent is selected from the group consisting of water, N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide, or a combination thereof; preferably, the solvent is water.

[0061] In a specific embodiment, the preparation method of the air electrode of the present invention adopts magnetic stirring.

[0062] In a preferred embodiment, the stirring time in the step (1...

Embodiment 1

[0075] Preparation of High Rate Performance Air Electrode 1

[0076] a. Dissolve polytetrafluoroethylene with a mass ratio of 6% in water solvent, mix and stir in a magnetic stirrer for 3 hours to obtain a uniform solution;

[0077] b. Stir and mix conductive agent: polytetrafluoroethylene: fluorocarbon active agent according to the mass ratio of 58:11:31 FS-3100 (DuPont TM ), water was added to the mixture and placed in a magnetic stirrer and mixed and stirred for 3 hours to obtain a uniform slurry;

[0078] c. Spray the slurry in step b on one side of the nickel foam through a spray gun, and bake at 120°C for 12 hours in a vacuum environment;

[0079] d, cutting the spare pole piece prepared in step c into a disc with a diameter of 14 mm as a pole piece with a high rate performance air electrode material;

[0080] E, drop the 0.1 mol / liter lithium perchlorate electrolyte solution with dimethyl sulfoxide (DMSO) into the Whatman GF / D glass fiber diaphragm in an amount of 1...

Embodiment 2

[0084] Fabrication of High Rate Performance Air Electrode 2

[0085] Repeat Example 1, the difference is: in step b conductive agent: polyacrylonitrile: fluorocarbon active agent FS-3100 (DuPont TM ) are mixed and stirred according to the mass ratio of 66:22:12.

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Abstract

The invention discloses a high-rate-performance air electrode material and application thereof. The high-rate-performance air electrode material comprises a conductive agent, an adhesive and a fluorocarbon active agent. A high-rate-performance air electrode is obtained by coating a current collector with the electrode material and baling the electrode material. The high-rate-performance air electrode prepared through the method is excellent in rate performance; an active pore structure in the high-rate-performance air electrode can ensure that discharging products grow in pores in a high-ratedischarging process to realize high-power discharging of a lithium air battery.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a high rate performance air electrode material and its application. Background technique [0002] Lithium-air battery is an emerging battery system with the highest theoretical energy density (3505 Wh / kg), and it is unanimously believed by the industry that it will be the only choice to replace lithium-ion batteries as the mainstream energy storage system in the future. However, due to the irreversible side reactions at the positive and negative electrodes during the cycle, the cycle efficiency, cycle life, and power output of lithium-air batteries are still difficult to meet the needs of further practical applications, especially the poor rate performance of the battery during discharge. It greatly restricts the output power of the lithium-air battery system. [0003] For the air cathode in lithium-air batteries, the existing literature research basically focuses o...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/8605H01M4/8828H01M4/9008H01M12/06
Inventor 彭哲万浩刘子萱王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI