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Air electrode material of double template porous channel structure for lithium air battery and preparation method thereof

A lithium-air battery and air electrode technology, which is applied to battery electrodes, structural parts, circuits, etc., can solve the problems of reducing the utilization rate of air electrode pores, reducing cycle performance and rate performance, and air electrode blockage, etc., to achieve good electrochemical cycle Stability, simple and easy preparation method, and the effect of reducing the amount of use

Inactive Publication Date: 2011-10-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a novel dual-mode pore structure air electrode, the purpose of which is to solve the positive electrode discharge product Li caused by the uneven concentration distribution of the positive active material oxygen in the positive electrode of the lithium-air battery. 2 o 2 / Li 2 Inhomogeneous deposition of O will cause local blockage of the air electrode, reduce the utilization rate of the air electrode pores, directly lead to the loss of capacity, reduce cycle performance and rate performance, etc., using the in-situ activation of carbon materials to prepare a high-efficiency lithium Diffusion electrodes for air batteries ensure that oxygen is evenly distributed throughout the air electrodes, provide a smooth transport channel during the discharge process, effectively relieve local blockage of the air electrodes, and improve the specific capacity and high rate performance of lithium-air batteries

Method used

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  • Air electrode material of double template porous channel structure for lithium air battery and preparation method thereof
  • Air electrode material of double template porous channel structure for lithium air battery and preparation method thereof
  • Air electrode material of double template porous channel structure for lithium air battery and preparation method thereof

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preparation example Construction

[0036] The preparation method of the dual-mode channel structure air electrode material of the present invention, the method comprises the following steps:

[0037] (1) supporting catalysts in situ on the surface of the porous carrier;

[0038] (2) Carry out in-situ activation treatment of the pores on the porous carrier after loading the catalyst;

[0039] (3) Uniformly mixing the porous carrier obtained in (2) with the binder to form a dual-mode porous structure air electrode material, and the mass ratio of the porous carrier to the binder is 1:1˜10:1.

[0040] The in-situ loading of the catalyst on the surface of the porous carrier includes in-situ chemical reaction deposition on the surface of the porous carrier, impregnation, electroplating deposition, physical vapor deposition or a combination thereof. The thickness of the catalyst on the surface of the porous carrier is 0.5-50nm, and the size of the porous carrier is 50nm-1000nm.

[0041]The in-situ activation treatme...

Embodiment 1

[0056] ①Catalyst loading: first take 1g of dry ordered mesoporous carbon CMK-3, and use the same catalyst loading method as in Comparative Example 2 to obtain MnO 2 @CMK-3 carrier; ② in situ activation: take 0.4g of MnO 2 @CMK-3, add 0.4g KOH and 4ml distilled water, evaporate the water to dryness at 100°C, then transfer to nickel crucible, tube furnace N 2 Under atmosphere, heat up to 750°C at a heating rate of 2°C / min, keep at 750°C for 1 h, wash with 2mol / L HCl at room temperature, then wash with water until neutral, and finally dry the mixture in vacuum at 100°C, and mix with poly The mass ratio of vinylidene fluoride (PVDF) 9:1 prepares air electrode by the mode of comparative example 1, assembles with comparative example 1, in the voltage range of 2-4.5V, 0.1mA / cm 2 The charge-discharge test was carried out at the current density. The obtained test results are shown in Table 1. From the data in Table 1, it can be seen that compared with Comparative Example 1 and Compa...

Embodiment 2

[0058] ① Catalyst loading: First, 1 g of dry ordered mesoporous carbon CMK-3 was immersed in 4.6 mol / L Co(NO 3 ) 2 In 50ml ethanol solution, magnetically stirred for 30min, then centrifuged at 2950r / min for 30min, dried in vacuum at room temperature for 24h, and then treated at 573K for 4h, obtained by impregnation method. 3 o 4 @CMK-3 carrier; ② in situ activation: take 0.4g of Co 3 o 4 @CMK-3, add 0.4g KOH and 4ml distilled water, evaporate the water to dryness at 100°C, then transfer to nickel crucible, tube furnace N 2 Under atmosphere, heat up to 750°C at a heating rate of 2°C / min, keep at 750°C for 1 h, wash with 2mol / L HCl at room temperature, then wash with water until neutral, and finally dry the mixture in vacuum at 100°C. There is no catalyst in the new pores due to activation, that is, the Co 3 o 4 Air electrode material with double-mode pore structure as catalyst.

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Abstract

The invention relates to a novel air electrode material of a double template porous channel structure and a preparation method thereof. In the manner of a carbon material in situ activation, oxygen is ensured to be uniformly distributed in a whole air electrode, a smooth conveying channel is provided, so that the local blockage of the air electrode is efficiently relieved, and the specific capacity of a lithium air battery is improved. The method comprises the following steps of: uniformly loading a catalyst on a porous carrier, and then performing situ porous channel activation treatment on the carrier loading the catalyst so as to form new micropores. When discharging, without catalyst loading in the porous channel generated by the activation, no product is deposited, so that the conveying channel of the oxygen is ensured to be smooth. Under the current density of 0.1 mA / sq.cm, the reversible discharging specific capacity of 1560 mAh / g is obtained, which is obviously improved compared with the conventional air electrode.

Description

technical field [0001] The invention relates to a kind of dual-mode pore structure air electrode material for lithium-air batteries and a preparation method thereof. Background technique [0002] In a lithium-oxygen battery, 1Kg metal lithium oxidation can release 11680Wh / Kg of energy, almost comparable to 13000Wh / Kg of petroleum, far exceeding the energy density of any existing electrochemical power source. The positive electrode active material oxygen of the lithium oxygen battery does not need to be stored in the battery, but is provided by the air in the environment, so it is also called a lithium air battery. [0003] The negative electrode lithium reacts directly with the air from the surrounding environment in the porous positive electrode, so the positive electrode is also called an air electrode, and the electrode reaction is However, due to the low solubility of the obtained product lithium peroxide in the organic electrolyte, it is deposited in the pores of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 温兆银崔言明刘宇鹿燕吴相伟张敬超
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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