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Application of carbon material containing in-situ doped component with catalytic activity to lithium-air battery

A catalytic activity, in-situ doping technology, applied in battery electrodes, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of limited uniformity between catalysts and carbon materials, limited catalyst Problems such as particle size and low catalyst utilization rate can be solved to improve dispersion and coverage, reduce charge and discharge polarization potential, and improve energy efficiency.

Inactive Publication Date: 2013-04-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, in the way of mechanical mixing, the uniformity of catalyst and carbon material mixing is limited, and it cannot be guaranteed that there is catalyst on the surface of all carbon materials, so the utilization rate of catalyst is low
The use of catalysts loaded on the surface of carbon materials can improve the mixing uniformity of the two to a certain extent, but it cannot guarantee the presence of catalysts on the surface of all carbon materials, for example, limited by the particle size of catalyst particles , some pores of the carbon material cannot deposit catalyst particles

Method used

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  • Application of carbon material containing in-situ doped component with catalytic activity to lithium-air battery
  • Application of carbon material containing in-situ doped component with catalytic activity to lithium-air battery

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preparation example Construction

[0031] SBA-15 ordered mesoporous SiO 2 The preparation of, as reference Zhao, D., Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50to 300Angstrom Pores.Science 1998, 279 (5350), 548-552.

[0032] Specifically, it can be prepared according to the following steps: dissolve the surfactant in a solvent to obtain a solution A with a concentration of 1-10wt%; After heating for 12-48h, filtering, washing, and drying, burn off the surfactant at 300-550°C to obtain SBA-15 ordered mesoporous SiO 2 .

[0033] The surfactant is one or more than two of F127, F108 or P123; the solvent is one or more of water, ethanol, isopropanol, methanol; the acid solution is dilute hydrochloric acid, Sulfuric acid or nitric acid; the silicon source is ethyl orthosilicate.

Embodiment 1

[0035]Porous carbon materials were prepared using nano-magnesium carbonate powder as a template. Accurately weigh 5g of sucrose and 0.29g of nickel nitrate hexahydrate, add 15ml of deionized water and stir until completely dissolved, then add 5g of magnesium carbonate, heat in a water bath at 80°C and stir mechanically to make them completely soluble, the power range of mechanical stirring It is 200w, and the stirring speed is 300rpm. After the water evaporated completely, put it into 80℃ for vacuum drying for 24h. Then put the dried product into a high-temperature tube furnace for carbonization, the atmosphere is nitrogen, and the gas flow is controlled at 30ml / min. Take out the nanoparticle / carbon composite by carbonization at 800°C for 2 hours, add an appropriate amount of 2M dilute hydrochloric acid to remove nano-magnesium carbonate, and vacuum dry at 80°C for 24 hours after filtration to obtain a porous carbon material doped with NiO nanoparticles in situ.

Embodiment 2

[0037] Porous carbon materials were prepared using nano-magnesia powder as a template. Accurately weigh 5g of sucrose and 0.267g of zirconium oxynitrate dihydrate, add 8ml of deionized water and stir until completely dissolved, then add 8g of magnesium oxide, heat and stir mechanically in a water bath at 80°C to make them completely soluble, the power of mechanical stirring The range is 200w and the stirring speed is 300rpm. After the water evaporated completely, put it into 80℃ for vacuum drying for 24h. Then put the dried product into a high-temperature tube furnace for carbonization, the atmosphere is nitrogen, and the gas flow is controlled at 30ml / min. Carbonate at 900°C for 2 hours to obtain nanoparticle / carbon composites, then use appropriate amount of 2M dilute hydrochloric acid to remove nano-magnesium oxide, filter and dry in vacuum at 80°C for 24 hours to obtain in-situ doped ZrO 2 Nanoparticle porous carbon materials.

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Abstract

The invention relates to an application of a carbon material containing an in-situ doped component with catalytic activity to a lithium-air battery. The carbon material containing the in-situ doped component with catalytic activity is used as an electrode material in the lithium-air battery, the component with catalytic activity is doped in the carbon material in situ, and the component with catalytic activity is 1-80wt% of the carbon material. The component with catalytic activity is doped in situ in the preparation process of the carbon material and controllable in content, and the component with the catalytic activity is uniformly dispersed in the prepared carbon material, so that the dispersibility and coverage degree of the component with catalytic activity on the surface of the carbon material are greatly improved, the utilization ratio of the component with catalytic activity is increased in the charging and discharging processes, the discharging and discharging polarization potentials are reduced, and the energy efficiency of the lithium-air battery is increased.

Description

technical field [0001] The invention relates to the field of lithium-air batteries, in particular to the application of an electrode material in lithium-air batteries. Background technique [0002] With the rapid development of electronics, communication equipment and electric vehicles, people put forward higher requirements for battery performance. A lithium-air battery is a secondary battery that uses metallic lithium as the negative electrode and an air electrode as the positive electrode. Metal lithium as the negative electrode material has the lowest theoretical voltage, and its theoretical specific capacity is as high as 3,862mAh / g, while oxygen as the positive electrode active material can be obtained directly from the air. Therefore, lithium-air batteries have extremely high specific capacity and specific capacity. energy. Taking lithium as the standard, its theoretical specific energy density can reach 11,140Wh / Kg, and its actual specific energy is much higher tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38B01J23/755B01J21/18B01J23/72B01J23/745B01J23/30B01J23/32B01J23/26B01J23/28
CPCY02E60/10
Inventor 张华民李婧王美日张益宁王倩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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