A biochar-based cathode electrode sheet for lithium-air batteries

A technology of biochar and electrode sheets, which is applied to battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problems of not having the advantages of industrial-scale large-scale preparation, and achieve convenient Promote, improve the depth of utilization, and avoid the effect of technical routes

Active Publication Date: 2020-01-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, oxygen (air) positive electrode carbon materials mainly include super P, Ketjen carbon, acetylene black and graphene, etc. Recent research results show that graphene can exhibit a very high specific capacity (15000mAh / g according to the carbon material per unit weight calculation), although the preparation technology of graphene in the laboratory has gradually matured, it still does not have the advantages of large-scale preparation at the industrial level

Method used

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  • A biochar-based cathode electrode sheet for lithium-air batteries
  • A biochar-based cathode electrode sheet for lithium-air batteries
  • A biochar-based cathode electrode sheet for lithium-air batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Step 1. Mix Qigang and KOH according to the mass ratio of 5:3, then place it under a nitrogen atmosphere, and pyrolyze it at 900°C for 2 hours to obtain biochar; wherein, the yield of biochar prepared from Qigang as raw material is 30%;

[0035] Step 2. Grind the biochar obtained in step 1 into powder, then mix the biochar powder, acetylene black and PVDF evenly according to the mass ratio of 8:1:1 to obtain a slurry; then apply the slurry to the carbon Put it on the paper, dry it in a vacuum drying oven at 80°C, roll it, and cut it into pieces to obtain the positive electrode sheet of the lithium-air battery.

[0036] figure 1 It is the SEM image of the biochar prepared in step 1. It can be seen from the figure that the prepared biochar is a porous honeycomb structure, which is conducive to accommodating a large amount of air and increasing the discharge product (Li 2 o 2 ) storage space, providing more three-phase reaction interface, so it is beneficial to improve t...

Embodiment 2

[0046] Step 1. Mix Pennisetum hybrida and KOH at a mass ratio of 5:6, then place it under a nitrogen atmosphere, and pyrolyze it at 1200°C for 1 hour to obtain biochar; among them, biochar is prepared from Pennisetum hybrida as raw material The yield rate of 20%;

[0047] Step 2. Grind the biochar obtained in step 1 into powder, then mix the biochar powder, acetylene black and PVDF evenly according to the mass ratio of 8:1:1 to obtain a slurry; then apply the slurry to the carbon Put it on the paper, dry it in a vacuum drying oven at 80°C, roll it, and cut it into pieces to obtain the positive electrode sheet of the lithium-air battery.

[0048] From the SEM figure of the biochar prepared in this example, it can be seen that the prepared biochar is a porous structure, which is conducive to accommodating a large amount of oxygen (air), and increases the discharge product (Li 2 o 2 ) storage space, which provides more three-phase reaction interface, and thus is beneficial to i...

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Abstract

The invention relates to a positive electrode sheet of a lithium-air battery based on biochar, and belongs to the technical field of lithium-air batteries. The positive electrode sheet of the present invention is composed of a current collector, a conductive agent, a binder, and a positive active material; wherein, the positive active material biochar uses natural plants or agricultural wastes with a wide range of natural sources as raw materials, and completely avoids the use of Mineral resources, which greatly reduces the dependence of lithium-air batteries on metal resources, and improves the depth and breadth of agricultural and sideline product waste utilization, and is environmentally friendly. The lithium-air battery assembled by adopting the positive electrode sheet of the invention has high energy density and good cycle life.

Description

technical field [0001] The invention relates to a positive electrode sheet of a lithium-air battery based on biochar, and belongs to the technical field of lithium-air batteries. Background technique [0002] Metal-air battery, also known as metal fuel cell, is composed of metal negative electrode, electrolyte and air positive electrode. The air positive electrode can continuously absorb the electrode reaction active substance-oxygen from the surrounding environment, which is different from the traditional battery that can only obtain the electrode reaction active substance from the inside of the battery device. More than 1000Wh / kg. Among metal-air batteries, zinc-air batteries have been studied and commercialized for a long time, while magnesium-air batteries and aluminum-air batteries have also received extensive attention. Compared with other metal-air batteries, lithium-air batteries have the highest theoretical specific energy due to lithium's low redox potential (-3....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/96H01M12/08C01B32/348
CPCH01M4/8605H01M4/96H01M12/08Y02E60/10
Inventor 姚莹吴锋张存中李姝
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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