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Regulation and control method of MXenes topological structure, MXenes gel membrane electrode and energy storage device

A technology of topological structure and gel film, applied in the field of electrochemical energy storage, can solve the problems of large-scale use of time new energy, discontinuity of spatial distribution, etc.

Pending Publication Date: 2022-06-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the increasingly prominent energy and environmental problems, the development and utilization of new energy has emerged as the times require. Although new energy is green, friendly, and renewable, its discontinuity in spatial distribution and intermittency in time make The large-scale use of new energy is greatly restricted

Method used

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  • Regulation and control method of MXenes topological structure, MXenes gel membrane electrode and energy storage device
  • Regulation and control method of MXenes topological structure, MXenes gel membrane electrode and energy storage device
  • Regulation and control method of MXenes topological structure, MXenes gel membrane electrode and energy storage device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Preparation of 2 mg / mL Ti using the above-mentioned improved hydrofluoric acid etching method 3 C 2 T x Nanosheet dispersion;

[0071] (2) Under the magnetic stirring of 300r / min, 20mL of Ti 3 C 2 T x The nanosheet dispersion was added to 20 mL, 2 mol / L potassium hydroxide solution, and the curved and wrinkled Ti was obtained after stirring for 30 min under the protection of argon gas. 3 C 2 T x A suspension of nanosheets;

[0072] (3) The above Ti 3 C2 T x The suspension of nanosheets was transferred to a centrifuge bottle, and centrifuged and washed 6 times under the conditions of a rotating speed of 5000 r / min and a time of 20 min to obtain purified curved and wrinkled Ti 3 C 2 T x Nanosheets;

[0073] (4) The above-mentioned purified bent and wrinkled Ti 3 C 2 T x The nanosheets were prepared into a dispersion of 2 mg / mL, and 10 mL of the dispersion was taken for vacuum filtration and assembly to obtain Ti 3 C 2 T x Gel membrane electrodes.

...

Embodiment 2

[0078] (1) Preparation of 20 mg / mL Ti by the above-mentioned improved hydrofluoric acid etching method 3 C 2 T x Nanosheet dispersion;

[0079] (2) Under magnetic stirring at 500 r / min, 5 mL of the above Ti 3 C 2 T x The nanosheet dispersion was added to 40 mL, 0.1 mol / L potassium hydroxide solution, and the curved and wrinkled Ti was obtained after stirring for 120 min under the protection of nitrogen. 3 C 2 T x A suspension of nanosheets;

[0080] (3) The above Ti 3 C 2 T x The suspension of nanosheets was transferred to a centrifuge bottle, and centrifuged and washed 3 times under the conditions of 2000 r / min and 60 min to obtain purified curved and wrinkled Ti 3 C 2 T x Nanosheets;

[0081] (4) The above-mentioned purified bent and wrinkled Ti 3 C 2 T x The nanosheets were prepared into a dispersion of 5 mg / mL, and 5 mL of the dispersion was taken and assembled by vacuum filtration to obtain Ti 3 C 2 T x Gel membrane electrodes.

[0082] Conclusion: Ti...

Embodiment 3

[0085] (1) Preparation of 0.1 mg / mL Ti by the above-mentioned improved hydrofluoric acid etching method 3 C 2 T x Nanosheet dispersion;

[0086] (2) Under magnetic stirring at 200 r / min, 100 mL of the above Ti 3 C 2 T x The nanosheet dispersion was added to 10 mL, 4 mol / L potassium hydroxide solution, and the curved and wrinkled Ti was obtained after stirring for 60 min under the protection of argon gas. 3 C 2 T x A suspension of nanosheets;

[0087] (3) The above Ti 3 C 2 T x The suspension of nanosheets was transferred to a dialysis bag with a molecular weight cut-off of 8000-14000 Da, and dialyzed under the condition of magnetic stirring. After the ionic conductivity of the dialysate was reduced to 20 μS / cm, the purified curved and folded Ti was obtained. 3 C 2 T x Nanosheets;

[0088] (4) The above-mentioned purified bent and wrinkled Ti 3 C 2 T x The nanosheets were prepared into a dispersion of 1 mg / mL, and 10 mL of the dispersion was taken for vacuum fi...

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Abstract

The invention discloses a regulation and control method of an MXenes topological structure, an MXenes gel membrane electrode and an energy storage device. The regulation and control method comprises the following steps: (1) mixing an MXenes nanosheet dispersion liquid with an etching agent, and converting the original straight and flat topological structure of the MXenes nanosheet into a curved and wrinkled topological structure by the etching agent to obtain the dispersion liquid of the highly curved and wrinkled MXenes nanosheet; (2) purifying the dispersion liquid of the MXenes nanosheet with the high bending folds, so as to obtain the purified MXenes nanosheet with the bending folds; and (3) assembling the purified bent and wrinkled MXenes nanosheets, so as to obtain the MXenes gel membrane electrode. The MXenes gel membrane electrode prepared by the method has the characteristics of high density and an open pore structure, and the interlayer structure of the MXenes gel membrane electrode can effectively accommodate solvated Al < 3 + >, Mg < 2 + > and Ca < 2 + > plasmas and can also ensure that the solvated Al < 3 + >, Mg < 2 + > and Ca < 2 + > plasmas are compactly stored. When the MXenes gel membrane electrode regulated and controlled by the topological structure is used as a negative electrode material of an energy storage device, the MXenes gel membrane electrode shows ultrahigh volume specific capacity and excellent rate capability.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a method for regulating MXenes topological structure, an MXenes gel membrane electrode and an energy storage device. Background technique [0002] With the increasingly prominent energy and environmental problems, the development and utilization of new energy has emerged. Although new energy has the characteristics of green, friendly and renewable, its discontinuity in spatial distribution and intermittency in time make The large-scale use of new energy is greatly restricted. The introduction of electrochemical energy storage devices can effectively cut peaks and fill valleys for new energy, thereby effectively improving its utilization rate and broadening its application fields. Therefore, electrochemical energy storage devices with excellent performance, low cost, and environmental protection are actively developed. It has become a research hotspot in the current ...

Claims

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Application Information

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IPC IPC(8): C01B32/921C01B32/914H01G11/36H01G11/50B82Y30/00B82Y40/00
CPCC01B32/921C01B32/914H01G11/36H01G11/50B82Y30/00B82Y40/00C01P2004/02C01P2004/04C01P2004/03C01P2002/72C01P2006/40C01P2004/20Y02E60/13
Inventor 曲良体马鸿云
Owner TSINGHUA UNIV
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