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All-solid-state lithium-air battery composite positive electrode material and all-solid-state lithium-air battery

A composite positive electrode material and air battery technology, applied in battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc., can solve the problems of large battery polarization, poor cycle performance, and low safety performance , to achieve large specific surface area, strong adsorption capacity, and improve cycle performance

Active Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems of poor cycle performance, large battery polarization, and low safety performance in the lithium-air battery in the prior art, the first purpose of the present invention is to provide a kind of good conductivity, high oxygen transmission rate, which can make the discharge Composite cathode materials for all-solid-state lithium-air batteries with products oxidized in the cathode region

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] A composite positive electrode sheet was prepared, and a polymer electrolyte of MIL-53 (Al), polyethylene oxide (PEO), and lithium bistrifluoromethanesulfonimide (LiTFSI) was prepared.

[0034] Preparation of composite positive electrode sheet: Weigh 0.03g of LiI, 0.15g of PEO, 0.03g of carbon nanotube (CNT) and 0.03g of MIL-53(Al), add 9g of acetonitrile to it, stir well to make it uniform, and then The solvent was volatilized for 6 hours, and then volatilized at 80° C. for 24 hours, cut into sheets with a thickness of 60 μm and a mass of 0.005 g to obtain a composite positive electrode sheet.

[0035]Preparation of solid electrolyte membrane: Dissolve 0.08g of MIL-53(Al) and 0.23g of LiTFSI in 9mL of acetonitrile, stir for 2h, add 0.4g of PEO, stir for 24h, evaporate the solvent at room temperature for 6h, and then After volatilization for 24 hours, a polymer electrolyte membrane with a thickness of 150 μm was obtained.

[0036] The prepared composite positive electr...

Embodiment 2

[0038] Prepare the same composite positive electrode sheet and polymer electrolyte as in Example 1, and assemble it into an all-solid lithium-air battery. At 70°C, the current density is 150mA / g c , the cut-off capacity is 1000mA / g c Under the conditions of the test, the voltage difference of the first cycle is 0.7V, and the charge-discharge voltage difference after 5 cycles is 1.3V. Specific cycle test data such as figure 2 shown.

Embodiment 3

[0040] Composite positive electrode sheets were prepared, and polymer electrolyte membranes of MIL-53 (Al), polyethylene oxide (PEO), and lithium bistrifluoromethanesulfonimide (LiTFSI) were prepared (according to the method in Example 1).

[0041] Preparation of composite positive electrode sheet: Weigh 0.03g of LiTFSI, 0.15g of PEO, 0.06g of carbon nanotube (CNT) and 0.03g of MIL-53(Al), add 9g of acetonitrile to it, stir well to make it uniform, and then The solvent was volatilized for 6 hours, and then volatilized at 80° C. for 24 hours, cut into sheets with a thickness of 60 μm and a mass of 0.005 g to obtain a composite positive electrode sheet.

[0042] The prepared composite positive electrode sheet, polymer electrolyte membrane and lithium sheet were assembled into a button battery, and the current density was 150mA / g at 80°C c , the cut-off capacity is 1000mA / g c Under the conditions of constant current charge and discharge test. The voltage difference of the first...

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Abstract

The invention discloses an all-solid-state lithium-air battery composite positive electrode material and an all-solid-state lithium-air battery. The composite positive electrode material comprises a conductive carbon material, a micro-nano frame structure, a lithium-conducting polymer and a redox mediator, wherein the composite positive electrode material has the characteristics of good conductivity and high oxygen permeability; a discharge product can be oxidized in a positive electrode region; and the all-solid-state lithium-air battery with high circulation capability and high safety performance can be obtained on the basis of a positive plate prepared from the composite positive electrode material.

Description

technical field [0001] The invention relates to an all-solid lithium-air battery composite cathode material and an all-solid lithium-air battery, belonging to the technical field of lithium-air in new energy. Background technique [0002] The decline of fossil fuels and environmental issues have attracted more and more attention, and people are committed to finding new energy technologies that can replace fossil fuels. Lithium-ion batteries have been the most reliable energy storage system for many years, but factors such as low energy density, safety, and price limit the wider application of conventional lithium-ion batteries. [0003] The theoretical energy density of lithium-air batteries can reach 11680Wh kg -1 , which can match the energy density provided by gasoline (13000Wh kg -1 ) are comparable, therefore, lithium-air batteries, as a new type of green secondary energy, have the ability to replace traditional lithium-ion batteries and be used in electric vehicles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/62H01M12/06
CPCH01M4/602H01M4/625H01M12/06Y02E60/10
Inventor 刘晋李劼黄辰翔林月刘业翔
Owner CENT SOUTH UNIV
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