Cation-impregnated mxene solution, dried solid mxene formed by drying cation-impregnated mxene solution, and redispersed mxene solution formed by dissolving the dried solid mxene in redispersion solvent

Abstract

The present invention relates to a cation-impregnated MXene solution prepared by adding a metal cation or an organic cation containing nitrogen to an MXene solution represented by chemical formula 1 below, a dried solid MXene obtained in a solid form by drying same, and a redispersed MXene solution obtained by dissolving the dried solid MXene in a redispersion solvent. [Chemical formula 1] M n +1 X n wherein M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer of 1 to 4.

Description

A cation-impregnated MXene solution, a dried solid MXene formed by drying the cation-impregnated MXene solution, and a redispersed MXene solution formed by dissolving the dried solid MXene in a redispersed solvent.

[0001] The present invention relates to a method for preparing a cation-impregnated MXene solution by adding a metal cation or a nitrogen-containing organic cation to a MXene solution, drying the solution to obtain it in a solid form, and then dissolving it in a redispersed solvent to prepare a redispersed MXene solution.

[0002] MXene is a ceramic material with a two-dimensional planar structure in which carbon or nitrogen is bonded to a transition metal. The process of converting a three-dimensional MAX phase into a two-dimensional MXene involves an etching process using a strong acid. As a result of the etching process, functional groups such as hydroxyl groups (OH) and oxidizing groups (-O) remain on the surface of the MXene. Therefore, MXene has attracted attention as a material that possesses electrical conductivity due to the transition metal, while simultaneously being hydrophilic due to the functional groups present at the terminals.

[0003] In particular, MXene possesses strong hydrophilic properties, allowing it to disperse stably in water. Therefore, MXene is attracting attention as an ideal material for use in solution-based conductive inks.

[0004] Since the synthesis of MXene takes place in an acidic aqueous environment, the MXene is inevitably obtained in a dispersed form within the solution. However, to utilize MXene materials extensively in industry, there is a reason to dry the MXene to produce a solid form, such as a powder. First, MXene oxidizes easily in an aqueous environment, causing it to lose its inherently high electrical conductivity. Second, to apply mass production technology to MXene and ensure seamless material utilization across industries, it is more efficient and economical to use a powder form that is lighter than a solution.

[0005] Therefore, it is possible to convert aqueous MXene solutions into solid forms, such as MXene powder, by utilizing methods like thermal drying or freeze-drying. However, a critical drawback exists in that the redispersion efficiency is low when the dried MXene powder is dispersed back into a solvent. This occurs because, when the relatively inflexible MXene nanoparticles become strongly bound by van der Waals forces after drying, solvent molecules are unable to separate them again.

[0006] The objective of the present invention is to provide a cation-impregnated MXene solution and a method for preparing the same in order to solve the above problem.

[0007] In addition, the objective of the present invention is to provide a solid MXene obtained by preparing a cation-impregnated MXene solution and then drying it, and a method for preparing the same, in order to solve the above-mentioned problem.

[0008] In addition, the objective of the present invention is to provide a redispersed MXene solution in which solid MXene is redispersed and a method for preparing the same in order to solve the above-mentioned problem.

[0009] In addition, the object of the present invention is to provide a conductive film and a composite using a cation-impregnated MXene solution or a MXene solution redispersed in a redispersion solvent.

[0010] To achieve the above objectives of the present invention, the present invention discloses a cation-impregnated MXene solution comprising a MXene solution and a cation added to the MXene solution, wherein the MXene nanoparticles of the MXene solution are represented by the following chemical formula 1.

[0011] [Chemical Formula 1]

[0012]

[0013] Here, M is a transition metal element selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

[0014] The concentration of the above MXene solution is 0.01 mg / mL to 100 mg / mL, and the concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L.

[0015] The above cation comprises at least one selected from the group consisting of monovalent metal cations, divalent metal cations, trivalent metal cations, or organic cations containing nitrogen elements.

[0016] The monovalent metal cation comprises at least one selected from the group consisting of Li ions, Na ions, K ions, Rb ions, Cs ions, and Ag ions, the divalent metal cation comprises at least one selected from the group consisting of Mg ions, Ca ions, Co ions, Ni ions, Zn ions, Cu ions, and Sn ions, the trivalent metal cation comprises at least one selected from the group consisting of Al ions, Fe ions, and Cr ions, and the nitrogen-containing organic cation comprises at least one selected from alkylammonium ions.

[0017] The present invention relates to a dried solid MXene formed by drying a cation-impregnated MXene solution, wherein the dried solid MXene comprises MXene nanoparticles represented by the chemical formula 1 above.

[0018] The present invention discloses a redispersed MXene solution formed by dissolving a dried solid MXene in a redispersed solvent, wherein the dried solid MXene is formed by drying a cation-impregnated MXene solution, and the cation-impregnated MXene solution comprises a MXene solution and a cation added to the MXene solution, and the MXene nanoparticles of the MXene solution are represented by the chemical formula 1 above.

[0019] The concentration of the above MXene solution is 0.01 mg / mL - 100 mg / mL, the concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, and the concentration of the above redispersed MXene solution is 0.01 mg / mL - 100 mg / mL.

[0020] The present invention discloses a method for preparing a cation-impregnated MXene solution, comprising the step of adding a cation to a MXene solution, wherein the MXene nanoparticles of the MXene solution are represented by the chemical formula 1 above.

[0021] The concentration of the above MXene solution is 0.01 mg / mL - 100 mg / mL, the concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, and the concentration of the above redispersed MXene solution is 0.01 mg / mL - 100 mg / mL.

[0022] The present invention discloses a method for preparing a cation-impregnated MXene solution, comprising the step of adding a cation to a MXene solution, wherein the MXene nanoparticles of the MXene solution are represented by the chemical formula 1 above.

[0023] The concentration of the above MXene solution is 0.01 mg / mL to 100 mg / mL, and the concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L.

[0024] The above cation comprises at least one selected from the group consisting of monovalent metal cations, divalent metal cations, trivalent metal cations, or organic cations containing nitrogen elements.

[0025] The monovalent metal cation comprises at least one selected from the group consisting of Li ions, Na ions, K ions, Rb ions, Cs ions, and Ag ions, the divalent metal cation comprises at least one selected from the group consisting of Mg ions, Ca ions, Co ions, Ni ions, Zn ions, Cu ions, and Sn ions, the trivalent metal cation comprises at least one selected from the group consisting of Al ions, Fe ions, and Cr ions, and the nitrogen-containing organic cation comprises at least one selected from alkylammonium ions.

[0026] The present invention discloses a method for preparing dried solid MXene, comprising the steps of: adding a cation to a MXene solution; and drying the MXene solution to which the cation has been added, wherein the MXene nanoparticles of the MXene solution are represented by the chemical formula 1 above.

[0027] The present invention discloses a method for preparing a redispersed MXene solution, comprising the steps of: adding a cation to a MXene solution; drying the MXene solution to which the cation has been added; and dissolving the dried solid MXene in a redispersed solvent, wherein the MXene nanoparticles of the MXene solution are represented by the chemical formula 1 above.

[0028] The concentration of the above MXene solution is 0.01 mg / mL to 100 mg / mL, the concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, and the concentration of the above redispersed MXene solution is 0.01 mg / mL to 100 mg / mL.

[0029] The effects of the present invention obtained through the above-described solution are as follows.

[0030] The cation-impregnated MXene solution proposed in the present invention prevents MXene nanoparticles from binding strongly.

[0031] In addition, the cation-impregnated MXene solution proposed in the present invention can be stably redispersed in a solvent even after drying.

[0032] In addition, the film prepared by redispersing the cation-impregnated MXene solution proposed in the present invention into a dried solid MXene solution has a high degree of particle alignment.

[0033] In addition, a film prepared from a redispersed solution of dried solid MXene using the cation-impregnated MXene solution proposed in the present invention has high electrical conductivity.

[0034] The cation-impregnated MXene proposed in this invention can be customized for use in various industrial sectors due to its high redispersibility.

[0035] FIG. 1 is a conceptual diagram showing a cation-impregnated MXene solution, a dried solid MXene, a redispersed MXene solution obtained by dissolving the dried solid MXene in a redispersed solvent, and a method for preparing the same, according to one embodiment of the present invention.

[0036] Figure 2 is a photograph showing MXene redispersed at a high concentration in a solution according to one embodiment of the present invention.

[0037] Figure 3 is a photograph showing MXene redispersed at a low concentration in a solution according to one embodiment of the present invention.

[0038] Figure 4 is a photograph showing a MXene solution impregnated with Li ions, which are monovalent metal cations, according to one embodiment of the present invention, depending on the concentration of Li ions.

[0039] Figure 5 is a photograph showing a MXene solution impregnated with Mg ions, which are divalent metal cations, according to one embodiment of the present invention, depending on the concentration of Mg ions.

[0040] Figure 6 is a photograph showing a MXene solution impregnated with Al ions, which are trivalent metal cations, according to one embodiment of the present invention, depending on the concentration of Al ions.

[0041] FIG. 7 is a graph showing the results of measuring the absorbance of a redispersed MXene solution using a UV-vis absorption device after redispersing freeze-dried solid MXene in a solution according to one embodiment of the present invention.

[0042] FIG. 8 is a graph showing the redistribution rates of PMX, T-LiMX, T-MgMX, and T-AlMX according to one embodiment of the present invention.

[0043] Figure 9 is a photograph of redispersed MXene particles observed under a microscope according to one embodiment of the present invention.

[0044] FIG. 10 is an XRD graph of a film measured after making a film using a redispersed MXene solution according to one embodiment of the present invention.

[0045] FIG. 11 is a graph of the electrical conductivity of a film measured after making a film using a redispersed MXene solution according to one embodiment of the present invention.

[0046] In this specification, identical or similar reference numbers are assigned to identical or similar components even in different embodiments, and redundant descriptions thereof are omitted.

[0047] In describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description is omitted.

[0048] The attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of the present invention are included.

[0049] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0050] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0051]

[0052] Hereinafter, the cation-impregnated MXene solution related to the present invention, the dried solid MXene formed by drying the cation-impregnated MXene solution, and the redispersed MXene solution formed by dissolving the dried solid MXene in a redispersed solvent will be described in more detail with reference to the drawings.

[0053]

[0054] FIG. 1 is a conceptual diagram showing a cation-impregnated MXene solution, a dried solid MXene, a redispersed MXene solution obtained by dissolving the dried solid MXene in a redispersed solvent, and a method for preparing the same, according to one embodiment of the present invention.

[0055]

[0056] A solid MXene powder can be obtained by drying a MXene solution impregnated with a small amount of cations. In this case, the small amount of cations prevents the MXene nanoparticles from binding strongly to each other in the solution. When water is re-added to the dried MXene powder, the bonding between the MXene particles and water molecules is not smooth. However, as the small amount of cations bound to the MXene particles combine with the water molecules, the MXene powder exhibits high redispersibility in a water solvent.

[0057] In this case, the long rod-shaped figure shown in Fig. 1 represents a simplified MXene particle, and the small circles bonded between them represent the impregnated cations. The bottom left figure of Fig. 1 is a schematic representation of three water molecule-shaped circles bonding to the cations between the MXene particles rather than directly bonding to the MXene particles.

[0058] The bottom right figure of Fig. 1 illustrates how dried solid MXene is smoothly redispersed in an aqueous solution when water binds between MXene particles.

[0059]

[0060] The MXene used in the solvent redispersion method of MXene using cation impregnation according to one embodiment of the present invention is represented by the following [Chemical Formula 1].

[0061] [Chemical Formula 1]

[0062]

[0063] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

[0064] In the case where there are two transition metal elements, one of the transition metal elements can be represented as Ma and the other as Mb, and Chemical Formula 1 is (Ma (1-y) Mb y ) n+1 X n It can be represented as.

[0065] M n+1 Silver may include, for example, Ti3, Nb4, Mo2, V2, Cr2, Sc2, Mo2Ti, Cr2Ti, Nb2Ti, TiNb, TiZr, etc., but is not limited thereto.

[0066]

[0067] The ion used in the solvent redispersion method of MXene using ion impregnation according to one embodiment of the present invention comprises at least one selected from the group consisting of monovalent metal cations, divalent metal cations, trivalent metal cations, or organic cations containing a nitrogen element.

[0068] The above monovalent metal cation includes at least one selected from the group consisting of Li ions, Na ions, K ions, Rb ions, Cs ions, and Ag ions.

[0069] The above divalent metal cation includes at least one selected from the group consisting of Mg ions, Ca ions, Co ions, Ni ions, Zn ions, Cu ions, and Sn ions.

[0070] The above trivalent metal cation includes at least one selected from the group consisting of Al ions, Fe ions, and Cr ions.

[0071] The above organic cation containing the nitrogen element may be an alkylammonium ion, such as tetramethylammonium and tetrabutylammonium, but is not limited thereto.

[0072] Cations added to the MXene solution can bind to MXene nanoparticles, and, for example, cations can bind to the functional groups of the MXene nanoparticles. Here, "binding" can refer to any chemical bond regardless of form or type.

[0073] MXene nanoparticles having functional groups can be represented as shown in Chemical Formula 2 below.

[0074] [Chemical Formula 2]

[0075]

[0076]

[0077] Here, M is one or more transition metal elements, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4. T x The functional group may be an element selected from the group consisting of H, O, F, and Cl, but is not necessarily limited thereto.

[0078]

[0079] Hereinafter, a method for solvent redispersion of MXene using ion impregnation according to an embodiment of the present invention will be described in detail with reference to FIG. 1.

[0080]

[0081] [Example 1]

[0082] 1. Add a small amount of cation to the MXene solution. At this time, the concentration range of the MXene solution is 0.01 mg / mL to 100 mg / mL, and the concentration range of the added cation is 0.0000001 mol / L to 0.1 mol / L. Depending on the type of cation, the optimal concentration range in which the MXene solution can be dispersed may vary.

[0083] 2. The MXene solution to which a small amount of cation was added in Step 1 is freeze-dried to obtain MXene in a solid form, such as powder.

[0084] 3. The solid MXene obtained in Step 2 is added back to the solution to obtain MXene redispersed in the solution. At this time, the concentration of the redispersed MXene solution is 0.01 - 100 mg / mL. Concentrations outside this range may also be used, but concentrations within this range are typically used.

[0085]

[0086] FIG. 2 is a photograph showing MXene redispersed to a high concentration in a solution according to one embodiment of the present invention, and FIG. 3 is a photograph showing MXene redispersed to a low concentration in a solution according to one embodiment of the present invention.

[0087] In Figure 2, the concentration of the MXene solution is about 10 mg / mL, and the concentrations of the added cations are 0.01 mol / L for Li ions, 0.0001 mol / L for Mg ions, and 0.0001 mol / L for Al ions, respectively. The MXene solution impregnated with the Li ions, Mg ions, and Al ions is evenly redispersed without aggregation.

[0088] In Fig. 3, the concentration of the MXene solution is about 0.01 mg / mL, and the concentrations of the added cations are 0.01 mol / L for Li ions, 0.0001 mol / L for Mg ions, and 0.0001 mol / L for Al ions, respectively. The MXene solution impregnated with the Li ions, Mg ions, and Al ions is evenly redispersed without aggregation.

[0089] Figures 4 to 6 are photographs showing MXene solutions to which ions of various valencies have been added.

[0090] Figure 4 is a photograph showing a MXene solution impregnated with Li ions, which are monovalent metal cations, according to one embodiment of the present invention, depending on the concentration of Li ions.

[0091] The concentrations of the above Li ions are 1M and 10, respectively. -1 M, 10 -2 M, 10 -3 It is M. At this time, the concentration of Li ions is 1M to 10 -1 When M, MXene particles aggregate, and redispersion in the solution does not occur evenly. On the other hand, when the concentration of Li ions is 10 -2 M to 10 -3 When M, the MXene particles do not aggregate and are evenly redispersed in the solution.

[0092] Figure 5 is a photograph showing a MXene solution impregnated with Mg ions, which are divalent metal cations, according to one embodiment of the present invention, depending on the concentration of Mg ions.

[0093] The concentration of the above Mg ions is 10 each -2 M, 10 -3 M, 10 -4 M, 10-5 It is M. At this time, the concentration of Mg ions is 10 -2 M to 10 -3 When M, MXene particles aggregate, and redispersion in the solution does not occur evenly. On the other hand, when the concentration of Mg ions is 10 -4 M to 10 -5 When M, the MXene particles do not aggregate and are evenly redispersed in the solution.

[0094] Figure 6 is a photograph showing a MXene solution impregnated with Al ions, which are trivalent metal cations, according to one embodiment of the present invention, depending on the concentration of Al ions.

[0095] The concentration of the above Al ions is 10 each -2 M, 10 -3 M, 10 -4 M, 10 -5 It is M. At this time, the concentration of Al ions is 10 -2 When M, MXene particles aggregate, and redispersion in the solution does not occur evenly. On the other hand, when the concentration of Mg ions is 10 -3 M to 10 -5 When M, the MXene particles do not aggregate and are evenly redispersed in the solution.

[0096] Based on the experimental results above, it can be confirmed that redispersion occurs more effectively in MXene solutions impregnated with a relatively small amount of cations.

[0097]

[0098] FIGS. 7 and 8 are graphs showing the redispersion characteristics when solid MXene produced by freeze-drying a cation-impregnated MXene solution according to one embodiment of the present invention is redispersed in a solution.

[0099] FIG. 7 is a graph showing the results of measuring the absorbance of a redispersed MXene solution using a UV-vis absorption device after redispersing freeze-dried solid MXene in a solution according to one embodiment of the present invention.

[0100] In this case, PMX represents a standard MXene without added cations, T-LiMX represents a Li ion-impregnated MXene, T-MgMX represents a Mg ion-impregnated MXene, and T-AlMX represents an Al ion-impregnated MXene.

[0101]

[0102] The 700-800 nm absorption region shown in Fig. 7 is Ti3C2T x This is a characteristic absorption region that appears in the MXene of the composition. Since the absorbance of the above absorption region is proportional to the concentration of MXene contained in the solution, it can be used as an indicator to quantitatively calculate the concentration of MXene dispersed in the solution. As shown in Fig. 7, it can be confirmed that the absorbance of T-LiMX, T-MgMX, and T-AlMX is higher than that of PMX, so it can be seen that T-LiMX, T-MgMX, and T-AlMX have higher redispersion efficiency than PMX.

[0103] In addition, by utilizing the conversion index based on the absorbance-concentration correlation, the maximum absorbance value can be converted into the MXene solution concentration, which is illustrated in the graph on the right of Fig. 7.

[0104]

[0105] FIG. 8 is a graph showing the redistribution rates of PMX, T-LiMX, T-MgMX, and T-AlMX according to one embodiment of the present invention.

[0106] The above redispersion rate is calculated by comparing the ratio of the absorbance of the MXene solution before redispersion to the absorbance of the MXene solution after redispersion.

[0107] When using a general MXene material (PMX) without added metal cations, the redispersion rate of the solution after freeze-drying is about 60%.

[0108] On the other hand, in the case of MXene materials with added metal cations (T-LiMX, T-MgMX, T-AlMX), the redispersion rate of the solution after freeze-drying exceeds 90%, showing a significantly higher redispersion rate than that of general MXene materials (PMX).

[0109]

[0110] Figure 9 is a photograph of redispersed MXene particles observed under a microscope according to one embodiment of the present invention.

[0111] When the individual particles of the redispersed MXene solution produced by freeze-drying solid MXene solutions impregnated with Li ions, Mg ions, and Al ions, respectively, and then redispersing them in a solvent were observed under a microscope, it was confirmed that the individual sheets existed in a dispersed form without clumping together.

[0112]

[0113] FIGS. 10 and 11 are graphs showing structural and electrical characteristics after making a film using a redispersed MXene solution according to one embodiment of the present invention.

[0114] FIG. 10 is an XRD graph of a film measured after making a film using a redispersed MXene solution according to one embodiment of the present invention.

[0115] The MXenes impregnated with Li, Mg, and Al ions and then redispersed in a solvent are T-LiMX, T-MgMX, and T-AlMX, respectively. In this case, T-LiMX, T-MgMX, and T-AlMX exhibit a distinct (002) peak, similar to the general MXene PMX. Therefore, it was demonstrated that the redispersed MXenes T-LiMX, T-MgMX, and T-AlMX are films with high particle alignment.

[0116] FIG. 11 is a graph of the electrical conductivity of a film measured after making a film using a redispersed MXene solution according to one embodiment of the present invention.

[0117] The MXenes redispersed in a solvent after being impregnated with Li ions, Mg ions, and Al ions are T-LiMX, T-MgMX, and T-AlMX, respectively.

[0118] General MXene PMX exhibits an electrical conductivity of approximately 5000 S / cm, T-LiMX exhibits approximately 7000 S / cm, and T-MgMX and T-AlMX exhibit electrical conductivity of approximately 6000 S / cm. It was confirmed that cation-impregnated MXene films exhibit higher electrical conductivity than general MXene films without cation impregnation, thus possessing superior performance.

[0119]

[0120] The foregoing description is merely illustrative, and various modifications may be made by those skilled in the art without departing from the scope and technical spirit of the described embodiments. The foregoing embodiments may be implemented individually or in any combination.

[0121] The present invention can be used in industrial fields related to MXene or the application of MXene.

Claims

1. MXene solution; and It includes cations added to the above MXene solution, The MXene nanoparticles of the above MXene solution are represented by the following chemical formula 1, Cation-impregnated MXene solution. [Chemical Formula 1] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

2. In Paragraph 1, The concentration of the above MXene solution is 0.01 mg / mL - 100 mg / mL, and The concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, Cation-impregnated MXene solution.

3. In Paragraph 1, The above cation comprises at least one selected from the group consisting of monovalent metal cations, divalent metal cations, trivalent metal cations, or organic cations containing a nitrogen element. Cation-impregnated MXene solution.

4. In Paragraph 3, The above monovalent metal cation comprises at least one selected from the group consisting of Li ions, Na ions, K ions, Rb ions, Cs ions, and Ag ions, and The above divalent metal cation comprises at least one selected from the group consisting of Mg ions, Ca ions, Co ions, Ni ions, Zn ions, Cu ions, and Sn ions, and The above trivalent metal cation comprises at least one selected from the group consisting of Al ions, Fe ions, and Cr ions, and The above-mentioned organic cation containing the nitrogen element comprises at least one selected from alkylammonium ions, Cation-impregnated MXene solution.

5. A dried solid MXene formed by drying a cation-impregnated MXene solution, The above-mentioned dried solid MXene comprises MXene nanoparticles represented by the following chemical formula 1, Dried solid MXene. [Chemical Formula 1] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

6. A redispersed MXene formed by dissolving a dried solid MXene in a redispersed solvent, The above-mentioned dried solid MXene is formed by drying a cation-impregnated MXene solution, and The above cation-impregnated MXene solution is, MXene solution; and It includes cations added to the above MXene solution, The MXene nanoparticles of the above MXene solution are represented by the following chemical formula 1. Redispersed MXene solution. [Chemical Formula 1] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

7. In Paragraph 6, The concentration of the above MXene solution is 0.01 mg / mL - 100 mg / mL, and The concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, and The concentration of the above redispersed MXene solution is 0.01 mg / mL - 100 mg / mL, Redispersed MXene solution.

8. Includes the step of adding a cation to the MXene solution, and The MXene nanoparticles of the above MXene solution are represented by the following chemical formula 1, Method for preparing a cation-impregnated MXene solution. [Chemical Formula 1] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

9. In Paragraph 8, The concentration of the above MXene solution is 0.01 mg / mL - 100 mg / mL, and The concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, Method for preparing a cation-impregnated MXene solution.

10. In Paragraph 8, The above cation comprises at least one selected from the group consisting of monovalent metal cations, divalent metal cations, trivalent metal cations, or organic cations containing a nitrogen element. Method for preparing a cation-impregnated MXene solution.

11. In Paragraph 10, The above monovalent metal cation comprises at least one selected from the group consisting of Li ions, Na ions, K ions, Rb ions, Cs ions, and Ag ions, and The above divalent metal cation comprises at least one selected from the group consisting of Mg ions, Ca ions, Co ions, Ni ions, Zn ions, Cu ions, and Sn ions, and The above trivalent metal cation comprises at least one selected from the group consisting of Al ions, Fe ions, and Cr ions, and The above-mentioned organic cation containing the nitrogen element comprises at least one selected from alkylammonium ions, Method for preparing a cation-impregnated MXene solution.

12. A step of adding cations to the MXene solution; and The method includes the step of drying the MXene solution to which the above cation has been added, and The MXene nanoparticles of the above MXene solution are represented by the following chemical formula 1, Method for manufacturing dried solid MXene. [Chemical Formula 1] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

13. Step of adding cations to the MXene solution; A step of drying the MXene solution to which the above cation has been added; and The method includes the step of dissolving dried solid MXene in a redispersion solvent, The MXene nanoparticles of the above MXene solution are represented by the following chemical formula 1, Method for preparing a redispersed MXene solution. [Chemical Formula 1] Here, M is one or more transition metal elements selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4.

14. In Paragraph 13, The concentration of the above MXene solution is 0.01 mg / mL - 100 mg / mL, and The concentration of the above cation is 0.0000001 mol / L to 0.1 mol / L, and The concentration of the above redispersed MXene solution is 0.01 mg / mL - 100 mg / mL, Method for preparing a redispersed MXene solution.

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