Rechargeable magnesium battery positive electrode material based on polyimide and graphene compounding and preparation method thereof

A positive electrode material, polyimide technology, applied in the field of electrochemistry, can solve the problem of low energy density, achieve the effect of simple preparation method, excellent electrochemical magnesium storage performance, and avoid poor rate performance and cycle reversibility

Inactive Publication Date: 2020-08-04
NANJING UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathode material with the best performance is the Chevrel phase Mg reported by Aurbach in 2000. x Mo 3 S 4 , its maximum discharge capacity is close to 122mAh g -1 , can cycle more than 2000 cycles, but the lower working voltage (<1.3V vs. Mg) results in lower energy density

Method used

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  • Rechargeable magnesium battery positive electrode material based on polyimide and graphene compounding and preparation method thereof
  • Rechargeable magnesium battery positive electrode material based on polyimide and graphene compounding and preparation method thereof
  • Rechargeable magnesium battery positive electrode material based on polyimide and graphene compounding and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of polyimide / graphene composite:

[0026] (1) adding an appropriate amount of graphene into a certain amount of N-methylpyrrolidone solution, ultrasonic half an hour, to obtain a graphene dispersion;

[0027] (2) Add 2mmol 1,4,5,8-naphthalene tetracarboxylic dianhydride to the mixed solution in (1), then add an appropriate amount of p-phenylenediamine, 2 Reflux under protection for 5 to 10 hours;

[0028] (2) Cool to room temperature, filter the product with suction, wash several times with NMP, and then vacuum dry at 100-150°C for 12-25 hours;

[0029] (3) Finally, at N 2 Sintering at 300° C. for 6 to 10 hours under atmosphere to obtain the final product.

[0030] figure 1 The scanning electron microscope image (SEM) of the polyimide / graphene composite is shown, and it can be seen from the figure that the morphology of the composite is nanosheet.

Embodiment 2

[0032] Assembly of the battery:

[0033] (1) Grind the prepared polyimide / graphene composite, acetylene black and polyvinylidene fluoride evenly at a mass ratio of 6:3:1, and add an appropriate amount of N-methylpyrrolidone to make a homogenate , coated on carbon paper, dried in vacuum at 60°C for 12 hours, and then cut into discs with a diameter of 1.4cm, which are positive electrodes of magnesium batteries;

[0034] (2) Polish the magnesium foil with a thickness of 0.05 mm to a bright surface with SiC sandpaper, and then cut it into small discs as the positive electrode of the magnesium battery;

[0035] (3) Assemble the prepared positive and negative electrodes with glass fiber membrane and electrolyte to form CR2032 button cell.

Embodiment 3

[0037] Electrochemical performance test:

[0038] The magnesium battery was assembled in an anhydrous and oxygen-filled argon glove box, and its electrochemical performance tests were completed in the Blue Electron Testing System (LAND).

[0039] Turn on the blue electric test system, set the experimental parameters, and start the test.

[0040] figure 2 a and b are the charge-discharge curves and rate performance tests of polyimide / graphene composite electrodes at different current densities, respectively. It can be seen from the medium discharge curve that the cathode material has a relatively high discharge platform (1.6-1.8V). At 1C current density, the discharge specific capacity of the battery is as high as 150mAh g -1 , at 20C, the specific capacity can still maintain 60mAh g -1 , showing good rate performance.

[0041] image 3 It is the long-term cycle stability of the polyimide / graphene composite electrode at 10C. It can be seen that at a current density of 10...

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Abstract

The invention discloses a rechargeable magnesium battery positive electrode material, which is a polyimide / graphene compound. The compound is prepared by taking a product prepared by taking 1, 4, 5, 8-naphthalenetetracarboxylic dianhydride and p-phenylenediamine as reactants as an active component and taking graphene as a carrier. The invention also discloses a preparation method of the rechargeable magnesium battery positive electrode material. According to the rechargeable magnesium battery positive electrode material based on polyimide and graphene compounding provided by the invention, poor rate capability and cycle reversibility caused by dissolution of an organic matter with oxidation-reduction activity in an electrolyte and poor conductivity are avoided, and an assembled magnesium battery shows excellent electrochemical magnesium storage performance.

Description

technical field [0001] The present application relates to the field of electrochemical technology, in particular, to a rechargeable magnesium battery cathode material based on polyimide and graphene composite and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries are considered to be a very promising green electrochemical energy storage system, which has been commercialized, such as electric vehicles and mobile power supplies. However, the limited lithium resources and the safety issues caused by the generation of lithium dendrites during charging and discharging limit the large-scale application of lithium-ion batteries. [0003] In recent years, multivalent metal ions (such as Al 3+ , Ca 2+ , Mg 2+ etc.) batteries have attracted extensive attention from researchers due to their higher theoretical volume-specific capacity. Among them, metallic magnesium has a lower reduction potential of -2.37V (vs RHE), and a higher theoretica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/60H01M10/054
CPCH01M4/362H01M4/583H01M4/60H01M10/054H01M2004/028Y02E60/10
Inventor 金钟王艳荣薛晓兰陈仁鹏
Owner NANJING UNIV
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