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A kind of lithium-air battery extended interlayer melt-spinning preparation process

A lithium-air battery and melt-spinning technology, which is applied in the direction of battery electrodes, electrode manufacturing, fuel cell-type half-cells and primary battery-type half-cells, etc., can solve the problem of single structure of lithium-air batteries, affecting battery energy density, and inability to Improve diaphragm strength and other issues to reduce the risk of internal short circuit, prolong service life and avoid shrinkage

Active Publication Date: 2021-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Defects of lithium-air batteries: First, the positive active material is oxygen in the air, and the cathode reduction of oxygen needs to overcome a high energy barrier, which will inevitably cause large electrochemical polarization and affect the energy density of the battery; secondly, the non-aqueous electrolyte The lithium-air battery structure is relatively simple, and its main problem is the discharge product Li 2 o 2 The precipitation leads to the blockage of the air circuit, and the discharge cannot continue, which is directly related to the discharge capacity of the battery
The commonly used double-layer composite diaphragm obtains strength and pore structure at the expense of its electrical conductivity, and the modification of the air cathode cannot improve the strength of the diaphragm.

Method used

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  • A kind of lithium-air battery extended interlayer melt-spinning preparation process
  • A kind of lithium-air battery extended interlayer melt-spinning preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: get βMnO 2 0.15g, Ketjen Black 0.35g, EVA 0.5g, melt blending and stirring under heating in a water bath at 90 degrees Celsius to obtain a blend; take αMnO 2 0.4g, 0.4g of Ketjen Black, 0.1g of PVDF, and 0.1g of CaO were dissolved in 15ml of NMP, stirred and blended and placed in a sprayer to obtain a spray material. PVDF-HFP diaphragm is used as a battery diaphragm. Pour the molten blend into an extruder with a heating device. Through extrusion, the blend is pressed out of the spinneret through a metering pump and condensed into thin strips on the HFP diaphragm. , refer to figure 2 , form a mesh layer in an orthogonal manner, and spray a layer of spray after each layer of mesh layer is formed, the amount of spray per square meter of mesh layer is 50ml, and finally attach 3 layers of mesh layer on the diaphragm. The resulting collection of all mesh layers and sprays is the expanded interlayer. Dry the separator with the expanded interlayer in an oven...

Embodiment 2

[0032] Embodiment 2: Take αMnO 2 0.1g, graphene 0.4g, PEG 0.5g, melt blending and stirring under 80 degrees Celsius water bath heating to obtain a blend; take βMnO 2 0.4g, graphene 0.4g, PVDF 0.1g, CaO 0.1g, dissolved in 20ml NMP, stirred and blended and placed in a sprayer to obtain a spray material. The glass fiber mat is used as a battery separator. The molten blend is poured into an extruder with a heating device. Through extrusion, the blend is pressed out of the spinneret through a metering pump and condensed into thin strips on the glass fiber mat. , refer to figure 2 , form a mesh layer in an orthogonal manner, and spray a layer of spray every time 2 mesh layers are formed, the spray volume of the mesh layer per square meter is 60ml, and finally attach 4 layers of mesh layers on the diaphragm. The final collection of the net layer and the spray is the expanded interlayer. Dry the separator with the expanded interlayer in an oven at 50°C for 24 hours, take it out ...

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Abstract

The invention discloses a lithium-air battery extended interlayer melt-spinning preparation process, which comprises the following steps of intermelting and blending catalysts, conductive carbon and hot-melt polymers at high temperatures, and extruding the obtained blends The machine is bonded to the diaphragm of the lithium-oxygen battery in the form of filaments in the form of alternating horizontal and vertical orthogonal netting to form a net-like layer. During the process of netting one or several layers, it will be blended in a certain proportion The catalyst, conductive carbon, binder and desiccant in a specific solvent are sprayed on the mesh layer in the form of spray, and the set of all mesh layers and sprays obtained by alternating and reciprocating several times is the expanded interlayer. The extended sandwich is loaded into the battery in such a way that it faces the air electrode. Adding the extended interlayer can make the membrane have better mechanical properties, and at the same time expand the catalytic space of the catalytic layer, increase the catalytic sites, and increase the Li 2 o 2 deposition space, so as to achieve the effect of improving battery performance.

Description

technical field [0001] The invention relates to a lithium-air battery extended interlayer melt spinning preparation process. Background technique [0002] The lithium-air battery is a high-energy battery with metal lithium as the negative electrode and the air electrode as the positive electrode. It is expected to achieve a specific energy of more than 10,000 Wh / kg. It is a new generation of high-energy batteries. [0003] Defects of lithium-air batteries: First, the positive active material is oxygen in the air, and the cathode reduction of oxygen needs to overcome a high energy barrier, which will inevitably cause large electrochemical polarization and affect the energy density of the battery; secondly, the non-aqueous electrolyte The lithium-air battery structure is relatively simple, and its main problem is the discharge product Li 2 o 2 The precipitation of the air leads to the blockage of the air circuit, and the discharge cannot continue, which is directly related t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06H01M4/88H01M4/04
CPCY02E60/10
Inventor 刘久清赵海均
Owner CENT SOUTH UNIV
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