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MXene-based flexible self-supporting electrode material and preparation method thereof

An electrode material, base electrode technology, applied in the direction of active material electrode, positive electrode, battery electrode, etc., can solve the problems of cumbersome preparation method, unfavorable electrochemical performance of material, limited conductivity of polymer film layer, etc., to improve the utilization rate , Improve long-term cycle stability, inhibit the effect of dissolution behavior

Active Publication Date: 2020-08-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of MXene-based flexible self-supporting electrode material and its preparation method, which overcomes the relatively cumbersome and high molecular weight of the preparation method in the prior art. The conductivity of the film layer is limited, which is not conducive to the overall electrochemical performance of the material.

Method used

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  • MXene-based flexible self-supporting electrode material and preparation method thereof
  • MXene-based flexible self-supporting electrode material and preparation method thereof
  • MXene-based flexible self-supporting electrode material and preparation method thereof

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Effect test

preparation example Construction

[0037] (1) Preparation of positive electrode sheet

[0038] With NTCDA and / or NDI as the active material, carbon black as the conductive agent, and polyvinylidene chloride (PVDF) as the binder, according to the mass fraction ratio, the ratio of active material: binder: conductive agent = 6:3:1 , fully ground and mixed evenly to form a slurry, which was poured onto copper foil with a scraper and dried overnight in a vacuum oven at 100°C, then rolled into a positive electrode sheet with a diameter of 10mm.

[0039] (2) Assembly of battery

[0040] Adopt CR-2032 button battery case, use the flexible electrode material prepared by the present invention and / or NTCDA and / or NDI as positive pole, metal lithium as negative pole, CelgardM825 microporous membrane as diaphragm, 1M LiPF 6 / EC+DMC (1:1, v / v) is the electrolyte, and in a glove box filled with argon, assemble it into a button battery in a certain order.

[0041] (3) Charge and discharge test

[0042] The present invention...

Embodiment 1

[0044] (1) Prepare MXene dispersion with a concentration of 5 mg / mL.

[0045] Prepare the etching solution of LiF, hydrochloric acid and ultrapure water and stir well, then add MAX phase Ti 3 AlC 2 The powder was continuously stirred and reacted. After the etching was completed, the mixed solution was transferred to a centrifuge tube, and centrifuged several times until the pH of the supernatant was close to 7; then the obtained precipitate was fully dispersed in deionized water, and the upper black dispersion was collected by centrifugation again, and finally Store the dispersion at low temperature.

[0046](2) Under the protection of high-purity argon and in a 25mL three-neck flask with a gas guide plug, add 25mg of NTCDA and 5mL of deionized water into the flask respectively, and ultrasonically treat it for 20min to make it evenly dispersed, and the mass ratio of NTCDA is controlled 50%.

[0047] (3) Under the protection of high-purity argon, pipette 5 mL of MXene disper...

Embodiment 2

[0059] (1) Prepare MXene dispersion with a concentration of 5 mg / mL.

[0060] Prepare the etching solution of LiF, hydrochloric acid and ultrapure water and stir well, then add MAX phase Ti 3 AlC 2 The powder was continuously stirred and reacted. After the etching was completed, the mixed solution was transferred to a centrifuge tube, and centrifuged several times until the pH of the supernatant was close to 7; then the obtained precipitate was fully dispersed in deionized water, and the upper black dispersion was collected by centrifugation again, and finally Store the dispersion at low temperature.

[0061] (2) Under the protection of high-purity argon and in a 25mL three-neck flask with a gas guide plug, add 30mg of NTCDA and 6mL of deionized water into the flask respectively, and ultrasonically treat it for 20min to make it evenly dispersed, and the mass ratio of NTCDA is controlled 60%.

[0062] (3) Under the protection of high-purity argon, pipette 4mL of MXene disper...

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Abstract

The invention relates to an MXene-based flexible self-supporting electrode material and a preparation method thereof. The MXene-based flexible self-supporting electrode material is prepared by carrying out suction filtration on a mixed solution of MXene and an active substance and carrying out film uncovering; the flexible electrode material prepared by the method provided by the invention has excellent conductivity and a regular two-dimensional structure and the like; and the dissolution behavior of the active substance in the electrolyte can be inhibited to a certain extent through the hydrogen bond acting force formed between the active substance and a series of groups such as -OH,-COOH and the like on the surface of the MXene, such that the electrochemical performance and the active site utilization rate of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium battery electrode materials and preparation thereof, in particular to an MXene-based flexible self-supporting electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs), since entering the market in the 1990s, have attracted more and more people's attention, and have been widely used in various mobile communication fields. However, the extensive use of traditional cathode materials containing transition metal elements (Li, Ni, Co, etc.) has caused shortage of resources and limited green recycling technologies that need to be resolved urgently. Therefore, organic cathode materials have attracted close attention from researchers because of their wide range of sources, diverse structural designs, and ease of processing. Among them, conjugated carbonyl compounds have a higher lithium intercalation voltage platform and are easier to synthesize, and are consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/137H01M4/60H01M10/0525H01M4/36
CPCH01M4/137H01M4/608H01M10/0525H01M4/366H01M2004/028Y02E60/10
Inventor 赵昕王振兴张清华巴兆虎董杰李琇廷
Owner DONGHUA UNIV
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