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Lithium-air battery

A lithium-air battery and battery technology, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of lithium-air battery stability, poor cycle performance, unrelated lithium-air battery cycle performance, and impracticality

Inactive Publication Date: 2018-09-07
长沙大衡智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical solutions of the above inventions are all based on the performance of lithium-air batteries, but the most critical cycle performance of lithium-air batteries is not involved in the above technical solutions
At present, the stability and cycle performance of lithium-air batteries are very poor, and they are not practical yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Will Li 2 CoO 3 Press an anode with a length of 5 cm, a width of 2 cm, and a height of 2 cm, and then prepare a 134 nm thick carbon film on its surface by chemical vapor deposition;

[0019] (2) Graphene was prepared by oxidation-reduction method, as a cathode, the thickness of the graphene layer was 0.6mm;

[0020] (3) A mixture of 1-methyl-3-methylimidazolium tetrafluoroborate and dimethylacetamide in a ratio of 5:1 was used as the electrolyte.

[0021] The anode, cathode, and electrolyte are packaged to form a lithium-air battery.

[0022] Battery test: The Land electrochemical test system was used to test that the charging and discharging platform of the battery was 4.05V. After 2000 cycles, its capacity lost 16%, and the energy density of the battery was 9.9kWh / Kg.

Embodiment 2

[0024] (1) Will Li 2 CO 3 Press an anode with a length of 5 cm, a width of 2 cm, and a height of 2 cm, and then prepare a 110 nm thick carbon film on its surface by chemical vapor deposition;

[0025] (2) Graphene was prepared by vapor deposition method, as a cathode, the thickness of the graphene layer was 0.8mm;

[0026] (3) A mixture of 1-methyl-3-methylimidazolium tetrafluoroborate and dimethylacetamide in a ratio of 3:1 was used as the electrolyte.

[0027] The anode, cathode, and electrolyte are packaged to form a lithium-air battery.

[0028] Battery test: Using the Land electrochemical test system, the charge and discharge platform of the battery was tested to be 4.21V. After 2000 cycles, its capacity lost 15%, and the energy density of the battery was 10.8kWh / Kg.

Embodiment 3

[0030] (1) Will Li 2 CO 3 Press an anode with a length of 5 cm, a width of 2 cm, and a height of 2 cm, and then prepare a 90 nm thick carbon film on its surface by chemical vapor deposition;

[0031] (2) Prepare graphene by oxidation-reduction method, as the cathode, the thickness of the graphene layer is 0.8mm;

[0032] (3) A mixture of 1-methyl-3-methylimidazolium tetrafluoroborate and dimethylacetamide in a ratio of 4:1 was used as the electrolyte.

[0033] The anode, cathode, and electrolyte are packaged to form a lithium-air battery.

[0034] Battery test: The Land electrochemical test system was used to test that the charging and discharging platform of the battery was 4.15V. After 2000 cycles, its capacity lost 12%, and the energy density of the battery was 9.7kWh / Kg.

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Abstract

The invention discloses a lithium-air battery and a preparation method thereof. The battery comprises an anode, a cathode and an electrolyte, wherein the anode is lithium salt and is covered with a carbon film on the surface, the cathode is graphene, and the electrolyte is a mixture of 1-methyl-3-methylimidazole tetrafluoroborate and dimethylacetamide. The battery has high heat stability, longer cycle life and higher energy density.

Description

technical field [0001] The invention belongs to the technical field of secondary ion batteries, and in particular relates to a lithium-air battery and a preparation method thereof. Background technique [0002] At present, lithium-ion secondary batteries have been widely used in people's lives, such as in notebook computers, mobile phones and other daily necessities, as well as various military equipment. However, for electric vehicles and rotorcraft, lithium-ion batteries with low energy density cannot meet the high energy density requirements of electric vehicles, which limits their long-term application in fields such as electric vehicles. To realize the popularization of electric vehicles, scientists urgently need to develop new battery systems with high energy density, low price and environmental friendliness. [0003] Lithium-air battery is a new type of chemical battery with a theoretical energy density 5-10 times that of lithium-ion batteries, which has aroused wide...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M8/0228
CPCH01M8/0228H01M12/08Y02E60/50
Inventor 不公告发明人
Owner 长沙大衡智能科技有限公司
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