A kind of multi-component flexible electrode based on mofs porous carbon, preparation method and application

Abstract

The invention belongs to the technical field of electrode material preparation, and discloses a multi-component flexible electrode based on MOFs porous carbon, a preparation method and an application thereof, and uses a solvothermal method to synthesize MOFs on the surface of a flexible conductive carbon material; for MOFs based on a flexible conductive carbon material Double doping; based on double-doped MOFs to construct a multi-component flexible electrode based on MOFs porous carbon with a synergistic mechanism of adsorption-intercalation-transformation. In the invention, the electrodes make full use of the synergistic effect between materials, overcome the limitations of a single anode material, and weaken the electrochemical kinetic hysteresis of sodium ions; prepare double-doped MOFs derivative flexible electrodes on the surface of flexible carbon material conductive substrates, and obtain A flexible anode material substrate with large specific surface area, high network conductivity and carrier mobility, and good structural stability; it improves the deep-seated mechanism of SICs energy density, power density, rate characteristics, and cycle stability.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a multi-component flexible electrode based on MOFs porous carbon, a preparation method and an application. Background technique [0002] At present, sodium-ion hybrid supercapacitors (SICs), due to their lower cost and more abundant resources than lithium-ion hybrid supercapacitors, have important application potentials in current electric vehicles and smart grid energy technologies, which have attracted the attention of the scientific community. s concern. The working principle of the device is to store charges through the pseudocapacitive reaction of sodium ions intercalating / extracting from the anode of the active material, and the reversible adsorption / desorption of anions in the organic electrolyte on the surface of the cathode. , rate characteristics and cycle stability of the energy storage mechanism. In 2012, Kuratani et al. first repo...

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Problems solved by technology

These materials have their own advantages and disadvantages: alloy type and conversion type anode materials have high specific capacity, but poor cycle stability; intercalation type and adsorption type anode have low specific capacity, but have the advantages of small volume expansion and good cycle stability.

[0008] (1) There is still relatively little research on MOFs derivatives in the field of SICs, and most of the prepared SICs anodes are based on powder materials derived from MOFs. The flexibility of electrodes based on MOFs derivatives has great research significance in the field of SICs

[0009] (2) The current flexible electrodes based on MOFs derivatives can provide limited power density

[0010] (3) Most existing conversion metal compounds have poor conductivity, and inherent defects such as volume expansion will occur during the sodium ion deintercalation process, resulting in poor capacity retention and rate characteristics

Moreover, the nanoscaled intercalated V 2 o 5 At the same time, the high reactivity brought by the high specific surface area of ​​the material tends to aggregate during the electrochemical reaction, resulting in usually irreversible parasitic chemical reactions, which affect the service life and performance improvement of the electrode

[0011] The difficulty in solving the above problems and defects is: how to combine the advantages of various types of anode materials, and at the same time give full play to the efficient and stable sodium ion deintercalation capabilities of adsorption, intercalation, and intercalation anode materials, as well as the excellent specific capacity of conversion anode materials , designing an anode with high power density, high energy density, and long-term cycle stability is still a challenge for current SICs research

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