A kind of porous carbon material for positive electrode of lithium-air or lithium-oxygen battery

A technology of porous carbon materials and lithium-oxygen batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unfavorable large-scale commercial preparation and application, failure to meet the requirements of lithium-air batteries, and high experimental conditions. The effects of space utilization, improved energy density and power density, and wide control range

Active Publication Date: 2017-07-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned materials are not conducive to large-scale commercial preparation and application due to their complicated preparation methods, high cost, and high experimental conditions, and still cannot meet the material requirements of lithium-air batteries.

Method used

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  • A kind of porous carbon material for positive electrode of lithium-air or lithium-oxygen battery
  • A kind of porous carbon material for positive electrode of lithium-air or lithium-oxygen battery
  • A kind of porous carbon material for positive electrode of lithium-air or lithium-oxygen battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Hierarchical porous carbon materials were prepared by using nanopowder magnesium carbonate as template combined with catalytic activation method. Accurately weigh 5g of glucose, add 15ml of deionized water and stir until completely dissolved, then add 0.498g of cobalt acetate and 5g of magnesium carbonate, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in after the water is completely evaporated Dry at 80°C 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 3 hours, add an appropriate amount of 2M dilute hydrochloric acid to remove nano-magnesium carbonate and cobalt oxide, and vacuum dry at 80°C for 24 hours after filtration to obtain a porous carbon material with a hierarchical pore structure.

[0044] The structure of the positive elect...

Embodiment 2

[0049] Hierarchical porous carbon materials were prepared using nickel hydroxide powder as a template combined with ammonia gas activation. Accurately weigh 5g of sucrose, add 10ml of deionized water and stir until completely dispersed, then add 10g of nickel hydroxide powder, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in 80°C after the water is completely evaporated Vacuum dried for 24h. Then put the dried product into a high-temperature tube furnace for carbonization, and treat it in Ar at 800°C for 3h to obtain a nanoparticle / carbon composite, then use an appropriate amount of 2M dilute nitric acid to remove nickel oxide, and vacuum dry it at 80°C for 24h after filtration. The dried product is put into a high-temperature tube furnace and purged with ammonia gas at 800°C for 1 hour to obtain a porous carbon material with a hierarchical pore structure.

Embodiment 3

[0051] Hierarchical porous carbon materials were prepared by using nano-calcium carbonate powder as a template combined with foaming method. Accurately weigh 5g of maltose and 2g of citric acid, add 10ml of deionized water and stir until completely dispersed, then add 10g of calcium carbonate, heat and mechanically stir in a water bath at 80°C to make it completely dispersed, and put it in 60°C after the water is completely evaporated Vacuum dried 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 20ml / min. After carbonization at 900°C for 2h, the nanoparticle / carbon composite was obtained, and then the nano-calcium carbonate was removed with an appropriate amount of 2M dilute hydrochloric acid, and then vacuum-dried at 80°C for 24h after filtration to obtain a porous carbon material with a hierarchical pore structure.

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Abstract

A porous carbon material for positive electrodes of lithium-air or lithium-oxygen batteries. The particle size of the carbon material is 1-30um. The particle itself is a honeycomb-like porous structure composed of carbon sheets. There are two kinds of holes in the interior, one is the staggered through holes composed of carbon sheets as the hole wall, and the other is the holes evenly distributed in the hole wall; the staggered through holes are mainly the second type of pore diameter ranges from The pores of 90nm and 100-500nm account for more than 80% of the pore volume of the through-hole, the pore volume ratio of the two is 1:10-10:1, and the thickness of the carbon sheet is 2-50nm; the pores in the pore wall are mainly Pores with a pore diameter ranging from 1 to 10 nm account for more than 90% of the inner pore volume of the pore wall. The carbon material can effectively improve the discharge specific capacity, voltage platform and rate discharge capability of the battery, thereby improving the energy density and power density of the lithium-air battery.

Description

technical field [0001] The invention belongs to the field of lithium-air or lithium-oxygen batteries, and in particular relates to positive electrode carbon materials for batteries. Background technique [0002] With the rapid development of electronics, communication equipment and electric vehicles, people put forward higher requirements for battery performance. Lithium-air (oxygen) battery is a secondary battery with metal lithium as the negative electrode and air (oxygen) 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, the lithium-air (oxygen) battery has a very high specific capacity. capacity and specific energy. Taking lithium as the standard, its theoretical specific energy density can reach 11,140Wh / Kg, and its actual specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96C01B32/05
CPCC01B32/05C01P2006/14C01P2006/16C01P2006/17C01P2006/40H01M4/861H01M4/96Y02E60/50
Inventor 张华民李婧张益宁王美日聂红娇周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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