Preparation method and application of lithium affinity-cobalt and manganese composite metal based organic frame catalyst of lithium-oxide battery cathode

A lithium-oxygen battery and composite metal technology, which is applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc., can solve the problem of affecting the cycle life and performance of lithium-oxygen batteries. , poor electronic conductivity, etc., to achieve the effects of excellent electronic conductivity, easy operation, and improved cycle life

Pending Publication Date: 2019-05-31
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the catalytic material of most lithium-oxygen batteries is manganese dioxide, but the electronic conductivity of manganese dioxide is poor, so that its performance cannot be fully exerted, thus affecting the cycle life of lithium-oxygen batteries

Method used

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  • Preparation method and application of lithium affinity-cobalt and manganese composite metal based organic frame catalyst of lithium-oxide battery cathode
  • Preparation method and application of lithium affinity-cobalt and manganese composite metal based organic frame catalyst of lithium-oxide battery cathode
  • Preparation method and application of lithium affinity-cobalt and manganese composite metal based organic frame catalyst of lithium-oxide battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add cobalt acetate, manganese acetate, and terephthalic acid to N,N-dimethylformamide at a molar ratio of 0.65:0.65:1. The ratio of N,N-dimethylformamide and cobalt acetate The molar ratio is 2:1 to prepare a mixed solution of cobalt acetate-manganese acetate-terephthalic acid-N,N-dimethylformamide;

[0032] (2) Transfer the mixed solution of cobalt acetate-manganese acetate-terephthalic acid-N,N-dimethylformamide to a hydrothermal kettle, and hydrothermally react at 150℃ for 40h;

[0033] (3) Add the reactant after the hydrothermal reaction to a 40% ethanol solution by mass concentration, and ultrasonically disperse for 30 min; settle the dispersed solution and discard the supernatant; repeat the above cleaning method 6 times;

[0034] (4) Centrifuge the washed reactant at 5000r / min for 10min, discard the supernatant, and keep the centrifuged product;

[0035] (5) Dry the centrifuged product at 70°C for 20 hours; after grinding through a 250-mesh sieve, a cobalt-manganese ...

Embodiment 2

[0037] (1) Add cobalt acetate, manganese acetate, and terephthalic acid to N,N-dimethylformamide at a molar ratio of 0.65:0.65:1. The ratio of N,N-dimethylformamide and cobalt acetate The molar ratio is 4:1 to prepare a mixed solution of cobalt acetate-manganese acetate-terephthalic acid-N,N-dimethylformamide;

[0038] (2) Transfer the mixed solution of cobalt acetate-manganese acetate-terephthalic acid-N,N-dimethylformamide to a hydrothermal kettle, and hydrothermally react at 150℃ for 40h;

[0039] (3) Add the reactant after the hydrothermal reaction to a 40% ethanol solution by mass concentration, and ultrasonically disperse for 30 min; settle the dispersed solution and discard the supernatant; repeat the above cleaning method 6 times;

[0040] (4) Centrifuge the washed reactant at 5000r / min for 10min, discard the supernatant, and keep the centrifuged product;

[0041] (5) Dry the centrifuged product at 70°C for 20 hours; after grinding through a 250-mesh sieve, a cobalt-manganese ...

Embodiment 3

[0043] (1) Add cobalt acetate, manganese acetate, and terephthalic acid to N,N-dimethylformamide at a molar ratio of 0.65:0.65:1. The ratio of N,N-dimethylformamide and cobalt acetate The molar ratio is 5:1, and the mixed solution of cobalt acetate-manganese acetate-terephthalic acid-N,N-dimethylformamide is prepared;

[0044] (2) Transfer the mixed solution of cobalt acetate-manganese acetate-terephthalic acid-N,N-dimethylformamide to a hydrothermal kettle, and hydrothermally react at 150℃ for 40h;

[0045] (3) Add the reactant after the hydrothermal reaction to a 40% ethanol solution by mass concentration, and ultrasonically disperse for 30 min; settle the dispersed solution and discard the supernatant; repeat the above cleaning method 6 times;

[0046] (4) Centrifuge the washed reactant at 5000r / min for 10min, discard the supernatant, and keep the centrifuged product;

[0047] (5) Dry the centrifuged product at 70°C for 20 hours; after grinding through a 250-mesh sieve, a cobalt-ma...

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Abstract

The invention relates to a preparation method and application of a lithium affinity-cobalt and manganese composite metal based organic frame catalyst of a lithium-oxide battery cathode. Cobalt acetate, manganese acetate and terephthalic acid are added to N,N-dimethyl formamide, and then transferred to a hydrothermal reactor for hydrothermal reaction; the mixture is washed by enthanol and then undergoes centrifugation, a supernatant solution is removed, and a centrifugation product is reserved; and the centrifugation product is dried, ground and sieved to obtain the cobalt and manganese composite metal based organic frame catalysis material. The preparation method is simple and easy to operate, the specific surface area is larger, more active sites are included, and the electron conductivity is high; and the material applied to a lithium affinity ZnO / CNT as a leveling layer of the cathode can attract lithium ions, catalytic reaction can be carried out in a better and rapider way, and the circulation life of the lithium-oxide battery is prolonged.

Description

Technical field [0001] The invention relates to a preparation method and application of a lithium-cobalt-manganese composite metal-based organic framework catalyst for a lithium-oxygen battery cathode. Background technique [0002] Lithium-oxygen battery is a battery that uses lithium as the negative electrode and oxygen in the air as the positive electrode reactant. Compared with traditional metal-oxygen batteries, lithium-oxygen batteries have smaller volume, lighter weight, higher working voltage and specific energy, and can be used in some systems that require high power and maintenance-free. At present, most of the catalytic materials of lithium-oxygen batteries are manganese dioxide, but the electronic conductivity of manganese dioxide is poor, so that its performance cannot be fully exerted, thereby affecting the cycle life of lithium-oxygen batteries. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08
CPCY02E60/10
Inventor 蔡克迪董纯希刘凡郎笑石徐天野张莹莹杜金秋
Owner BOHAI UNIV
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