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CN-122025592-A - NbS (NbS)2MXene composite material and preparation method and application thereof

CN122025592ACN 122025592 ACN122025592 ACN 122025592ACN-122025592-A

Abstract

The invention relates to the technical field of potassium ion batteries, in particular to a NbS 2 /MXene composite material, a preparation method and application thereof. According to the invention, a multi-layer niobium-based MXenes material is used as a precursor, nbS 2 /MXenes composite material is realized in one step through gas phase vulcanization reaction, and the Nb 2 C MXenes precursor is converted into NbS 2 in situ, so that chemical bonding of two phases on an atomic/molecular scale is realized. The strong interface coupling not only constructs a high-efficiency channel for electron/ion transmission and greatly improves the reaction kinetics, but also can effectively inhibit the volume expansion and sheet re-stacking of NbS 2 in the charge and discharge process by taking MXene as an excellent physical finite field frame, thereby fundamentally enhancing the structural stability of the material and providing fundamental guarantee for realizing high rate performance and long cycle life of the potassium ion battery.

Inventors

  • QIN LI
  • HU MIN
  • DING JIANFENG
  • ZHANG CHUANJIAN
  • HUANG HAIXU
  • JU SHUYUAN
  • LIU TIANLEI
  • BAI MEI
  • LI YIQUAN
  • HE HUAN
  • ZHU PENGHUI

Assignees

  • 安徽得壹能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260224

Claims (10)

  1. 1. The preparation method of the NbS 2 /MXene composite material is characterized by comprising the following steps of: (1) Dispersing a certain amount of multilayer Nb 2 C MXene and a sulfur source in a solvent, stirring and evaporating at a certain temperature, wherein the mass ratio of the sulfur source to the Nb 2 C MXene is 1.5-3.0; (2) And (3) annealing the solid product obtained after the evaporation in the step (1) in an argon atmosphere, and naturally cooling to room temperature after the annealing is finished, so that the obtained black powder is NbS 2 /MXene composite material.
  2. 2. The method of claim 1, wherein in step (1), the sulfur source comprises at least one of thiourea, thioacetamide, elemental sulfur, or L-cysteine.
  3. 3. The method of claim 2, wherein in step (1), the solvent comprises at least one of deionized water, ethanol, ethylene glycol, methanol, N-dimethylformamide.
  4. 4. The process according to claim 1, wherein in step (1), the temperature is 70 to 120 ℃.
  5. 5. The method according to claim 1, wherein in the step (2), the annealing treatment temperature is 600 to 1000 ℃ and the annealing heat treatment time is 4 to 12 h.
  6. 6. The NbS 2 /MXene composite material prepared by the preparation method according to any one of claims 1-5.
  7. 7. The use of the NbS 2 /MXene composite material prepared by the method of any one of claims 1-5 or as described in claim 5 in a potassium ion battery.
  8. 8. A negative electrode material of a potassium ion battery, which is characterized by comprising the NbS 2 /MXene composite material prepared by the preparation method of any one of claims 1-5 or the composite material of claim 6, a conductive agent and a binder.
  9. 9. The method for preparing the anode material of the potassium ion battery according to claim 8, wherein the anode slurry is obtained by mixing and grinding the NbS 2 /MXene composite material prepared by the preparation method according to any one of claims 1 to 5 or the conductive agent and the binder according to claim 6, adding a solvent, stirring, coating the anode slurry on a copper foil, and drying.
  10. 10. A potassium ion battery, wherein the negative electrode material of the potassium ion battery is the negative electrode material of claim 8.

Description

NbS 2/MXene composite material and preparation method and application thereof Technical Field The invention relates to the technical field of potassium ion batteries, in particular to a NbS 2/MXene composite material, a preparation method and application thereof. Background The information disclosed in the background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Potassium ion battery (KIBs) technology is considered one of the most promising technologies in the field of large-scale energy storage. Niobium disulfide (NbS 2) has high intrinsic electron conductivity, large interlayer spacing, and extremely low potassium ion migration barrier, is an excellent KIBs negative electrode material, but NbS 2 has serious agglomeration problems. In the prior art, nbS 2 powder is prepared by a solid-phase vulcanization method, and then is compounded with MXene by a hydrothermal solvent method. The method adopts a 'two-step method' composite strategy and has complex process, and in the prepared composite material, nbS 2 and MXene are mainly physically adsorbed or weakly interface combined, and the layered structure is stacked so that the material has the problem of capacity attenuation in long-period circulation. Disclosure of Invention In view of the above, the invention provides an NbS 2/MXene composite material, and a preparation method and application thereof. The NbS 2/MXene composite material is realized in one step by adopting a multi-layer niobium-based MXenes material as a precursor through a gas phase vulcanization reaction, and the chemical bonding of two phases on an atomic/molecular scale is realized by converting the Nb 2 C MXene precursor into NbS 2, so that the volume expansion and sheet stacking of NbS 2 in the charge and discharge process are effectively inhibited, and the structural stability of the material is fundamentally enhanced. In order to achieve the above object, the present invention is realized by the following technical scheme: In a first aspect, the invention provides a method for preparing an NbS 2/MXene composite material, which comprises the following steps: (1) Dispersing a certain amount of multilayer Nb 2 C MXene and a sulfur source in a solvent, stirring and evaporating at a certain temperature, wherein the mass ratio of the sulfur source to the multilayer Nb 2 C MXene is 1.5-3.0; (2) And (3) annealing the solid product obtained after the evaporation in the step (1) in an argon atmosphere, and naturally cooling to room temperature after the annealing is finished, so that the obtained black powder is NbS 2/MXene composite material. Further, in step (1), the sulfur source includes at least one of thiourea, thioacetamide, elemental sulfur, or L-cysteine. Further, in the step (1), the temperature is 70-120 ℃. Further, in the step (1), the solvent includes at least one of deionized water, ethanol, ethylene glycol, methanol, and N, N-Dimethylformamide (DMF) solvent. Further, in the step (2), the annealing treatment temperature is 600-1000 ℃, and the annealing heat treatment time is 4-12 h. In a second aspect, the invention provides the NbS 2/MXene composite material prepared by the preparation method in the first aspect. In a third aspect, the invention provides an application of the NbS 2/MXene composite material prepared in the first aspect or the NbS 2/MXene composite material prepared in the second aspect in a potassium ion battery. In a fourth aspect, the invention provides a negative electrode material of a potassium ion battery, which comprises the NbS 2/MXene composite material prepared in the first aspect or the second aspect, a conductive agent and a binder. In a fifth aspect, the present invention provides a method for preparing the anode material of the potassium ion battery according to the fourth aspect, which comprises the following steps: Mixing the NbS 2/MXene composite material prepared in the first aspect or the NbS 2/MXene composite material prepared in the second aspect, grinding, adding a solvent, stirring to obtain negative electrode slurry, smearing the negative electrode slurry on a copper foil, and drying to obtain the composite material. Further, the mass ratio of the NbS 2/MXene composite material, the conductive agent and the binder is 6-10:1:1. Further, the conductive agent is Super-P. Further, the binder is sodium carboxymethyl cellulose. Further, the grinding time is 5-10 min. Further, the stirring time is 0.5-1.5 h. Further, the drying operation parameters are 100-130 ℃ vacuum drying 8-12 h. In a sixth aspect, the present invention provides a potassium ion battery, where the negative electrode material of the potassium ion battery is the negative electrode material of the fourth aspect. Further, in the potassium ion battery, the el