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Lithium air battery gel air positive electrode, preparation method and lithium air battery

A lithium-air battery and air positive electrode technology, applied in battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problems of long time, low ion conductivity, complex design, etc. problems, to achieve the effects of easy industrial production, simple preparation method, and reduced polarization increase

Pending Publication Date: 2022-07-01
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ionic liquids are expensive and dense, so the ionic conductivity of solid electrolytes and polymer electrolytes is low, and the application barriers in lithium-ion batteries have not been resolved so far, not to mention that the positive electrode of lithium-air batteries needs to solve the three-phase transmission of air, ions and electrons The problem is that the design of the positive electrode is more complicated, and it will take a long time for scientific research and development to be truly applied; the gel electrolyte has a high ionic conductivity, which is a relatively feasible solution at present, but because the gel electrolyte is low at room temperature Gel state, fluidity only at high temperature, so high temperature liquid injection is required to use, which increases the cost and difficulty of battery preparation, and the gel electrolyte will fill some holes in the air positive electrode, reduce the transmission channel of the working gas, and affect the lithium battery. Rate performance of air batteries

Method used

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  • Lithium air battery gel air positive electrode, preparation method and lithium air battery
  • Lithium air battery gel air positive electrode, preparation method and lithium air battery
  • Lithium air battery gel air positive electrode, preparation method and lithium air battery

Examples

Experimental program
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Effect test

Embodiment 1～15

[0033] The lithium-air battery gel-air positive electrodes of Examples 1 to 15 are prepared from a current collector, a porous conductive material, a binder, a polymer monomer, a crosslinking agent, an initiator, a solvent, and a dispersant, and the initiator The molar ratio of agent and polymer monomer is 1:100; wherein,

[0034] The current collector in Examples 1-10 is selected from aluminum mesh, the porous conductive material is selected from carbon nanotubes (CNT), the adhesive is selected from polytetrafluoroethylene (PTFE), and the porous conductive material and the adhesive are selected. The mass ratio of the bonding agent is 92:8 (that is, the mass percentage of the porous conductive material is 92%, and the mass percentage of the binder is 8%), and the current collector in Examples 11 to 15 is made of stainless steel mesh , the porous conductive material is selected from Ketjen carbon (KB), the adhesive is selected from polyvinylidene fluoride (PVDF), and the mass r...

Embodiment 16～20

[0037] The lithium-air battery gel-air cathodes of Examples 16-20 are prepared from current collectors, porous conductive materials, binders, polymer monomers, auxiliary polymer monomers, cross-linking agents, initiators, solvents, and dispersants. into, and the molar ratio of the initiator and the polymer monomer is 1:100; wherein,

[0038] The current collector in Examples 16-20 is selected from nickel mesh, the porous conductive material is selected from acetylene black (AB), the adhesive is selected from polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), and the The mass ratio of the porous conductive material and the binder is 96:4 (that is, the mass percentage of the porous conductive material is 96%, and the mass percentage of the binder is 4%); The polymer monomer and the associated agent are respectively methyl methacrylate and triethylene glycol dimethacrylate, and the auxiliary polymer monomers in Examples 16 to 20 are respectively acrylonitrile, styrene, and m...

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Abstract

The invention relates to a lithium air battery gel air positive electrode, a preparation method and a lithium air battery, the lithium air battery gel air positive electrode comprises a current collector, the surface of the current collector is provided with a porous conductive material coating, and the porous conductive material coating comprises a porous conductive material. The outer surface of the porous conductive material is coated with a polymer gel layer, and electrolyte is completely locked in the polymer gel layer through the polymer gel layer, so that volatilization of the electrolyte is inhibited, side reaction between a discharge product and the porous conductive material is effectively isolated, polarization increase caused by the side product is reduced, and the service life of the porous conductive material is prolonged. The energy efficiency of the lithium-air battery is improved, and the cycle life of the lithium-air battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-air secondary batteries, and particularly relates to a lithium-air battery gel-air positive electrode, a preparation method and a lithium-air battery. Background technique [0002] Lithium-air battery is a new type of battery system with higher energy density than commercial lithium-ion battery. It mainly uses metal lithium as the negative electrode and oxygen as the air positive electrode. Using the reversible reaction between lithium and oxygen, it can reach 3500Wh / kg. The theoretical energy density is 10 times that of the existing lithium-ion battery system. Moreover, the lithium-air battery uses oxygen as the main working gas, which is environmentally friendly and easy to obtain, does not need to be stored in the battery, and is lighter in weight. The negative electrode and the air positive electrode of the lithium-air battery are usually infiltrated in the organic electrolyte. The positive a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/08
CPCH01M12/08H01M4/9008H01M4/8828H01M4/861H01M2004/8689
Inventor 彭佳悦
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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