A gadolinium hydroxyoxide ultrafine nanowire composite electrolyte, a preparation method thereof, and an application thereof

Abstract

The present invention discloses a gadolinium hydroxyoxide ultrafine nanowire composite electrolyte, a preparation method thereof and an application thereof. The preparation method includes: dissolving gadolinium chloride in deionized water, adding ethanol, and obtaining a mixed solution after mixing evenly; adding oleylamine and oleic acid to a hydrothermal autoclave, stirring and mixing, dropping the mixed solution, and carrying out a hydrothermal reaction; adding cyclohexane to the reaction system, ultrasonically dispersing until the solution is transparent, and then adding ethanol, and subjecting the obtained white floccules to sedimentation, centrifugal washing, and drying to obtain ultrafine nanowires; dissolving the ultrafine nanowires in an organic solvent, adding a polyethylene oxide electrolyte solution, mixing evenly, placing the mixture in a polytetrafluoroethylene petri dish, and drying in a vacuum oven to obtain the gadolinium hydroxyoxide ultrafine nanowire composite electrolyte. By adopting ultrafine nanowires, the present invention provides a continuous and fast lithium ion rapid transport channel, improves the mechanical properties and stability of the solid electrolyte, and the assembled solid-state lithium battery has good electrochemical properties.

Description

Technical Field

[0001] The present invention relates to the technical fields of nanomaterials and electrochemistry. Specifically, it relates to a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, a preparation method thereof, and an application thereof. Background Art

[0002] As an important new energy for sustainable development, lithium-ion batteries have been widely applied in fields such as electric vehicles, large-scale energy storage, and aerospace. At present, commercial lithium-ion batteries still use organic liquid electrolytes or gel electrolytes. The introduction of flammable and explosive organic liquids brings great safety hazards to the battery system. At the same time, due to the incompatibility of organic liquids with high specific energy electrode materials such as metallic lithium, the improvement of the battery energy density is limited. Therefore, replacing the electrolyte with a solid electrolyte and developing a solid-state battery with high energy density, high safety, and long cycle life is the fundamental way to solve the above problems.

[0003] In recent years, solid-state batteries have received extensive attention and emphasis from researchers at home and abroad and have developed rapidly. However, solid-state batteries also face some problems that need to be solved urgently, which limit their large-scale production and application. During the cycling process of large-capacity solid-state batteries, the capacity decay is serious, and the long-term cycling stability is poor. For the application of fast-chargeable solid-state batteries, the power density needs to be improved. The growth of dendrites causes safety problems such as short circuits and thermal runaway, which are closely related to the ion transport kinetics of solid electrolytes and the physical and chemical contact problems at the solid / solid interface. However, single-component solid electrolytes have problems such as low ionic conductivity and large interfacial impedance.

[0004] To address such bottleneck problems, in recent years, scientists have made different degrees of modification attempts in solid electrolytes, electrode material types, and structures, including adding plasticizers, cross-linking, grafting, optimizing the structure and concentration of lithium salts, and introducing inorganic fillers. Among them, the addition of functional inorganic additives has also received increasing attention. A large number of studies have shown that constructing composite solid electrolytes by adding inorganic fillers to polymer solid electrolytes is an effective strategy to comprehensively improve various properties of electrolytes. Summary of the Invention

[0005] In view of this, the present invention provides a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, a preparation method thereof, and an application thereof, so as to solve the problem of poor performance of existing solid electrolytes due to the large size of ordinary inorganic fillers, the large proportion of inert lithium-ion transport regions inside, and easy agglomeration.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] A preparation method of a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte includes the following steps:

[0008] S1. Dissolve gadolinium chloride in deionized water, add ethanol, and mix evenly to obtain a mixed solution. Add oleylamine and oleic acid to a hydrothermal reactor, stir and mix, drop in the mixed solution, and carry out a hydrothermal reaction;

[0009] S2. Add cyclohexane to the reaction system, ultrasonically disperse until the solution is transparent, then add ethanol. The prepared white flocculent precipitate is sedimented, centrifuged, washed, and dried to obtain ultrafine nanowires;

[0010] S3. Dissolve the ultrafine nanowires in an organic solvent, add a polyethylene oxide electrolyte solution, mix evenly, place in a polytetrafluoroethylene petri dish, and dry in a vacuum oven to obtain a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte.

[0011] According to the above scheme, in step S1, the mass-volume ratio of the gadolinium chloride, the ethanol, the oleylamine, and the oleic acid is 1 g:(7 - 12) mL:(3 - 5) mL:(1 - 2) mL, wherein the volume ratio of the oleylamine to the oleic acid is (5 - 3):(1 - 2).

[0012] According to the above scheme, the conditions of the hydrothermal reaction include: the reaction temperature is 120 - 180 °C, and the reaction time is 6 - 12 h.

[0013] According to the above scheme, in step S2, the volume ratio of the cyclohexane to the ethanol is 1:(2 - 4).

[0014] According to the above scheme, in step S2, the sedimentation time is 1 - 2 h, and the rotation speed of the centrifugal washing is 5000 - 10000 revolutions per minute.

[0015] According to the above scheme, in step S3, the preparation method of the polyethylene oxide electrolyte solution includes: dissolving polyethylene oxide and lithium bis(trifluoromethanesulfonyl)imide in the organic solvent.

[0016] According to the above scheme, the ultrafine nanowires account for 1 - 10 wt% of the total mass of the polyethylene oxide electrolyte solution.

[0017] On the basis of the above scheme, the second object of the present invention is to provide a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, which is prepared by using the above-mentioned preparation method. The gadolinium oxyhydroxide ultrafine nanowire composite electrolyte includes ultrafine nanowires, polyethylene oxide, and lithium bis(trifluoromethanesulfonyl)imide.

[0018] According to the above scheme, the diameter of the ultrafine nanowires is 2 - 5 nm, and the length is 500 - 1000 nm; the thickness of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte is 50 - 100 μm.

[0019] Based on the above solutions, the third object of the present invention is to provide the application of gadolinium hydroxide oxide ultrafine nanowire composite electrolyte in solid-state lithium-ion batteries.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) For the gadolinium hydroxide oxide ultrafine nanowire composite electrolyte provided by the present invention, due to the ultrafine nanowire inorganic filler, on the one hand, it can construct a long-range continuous organic / inorganic interface in the polymer-based solid electrolyte, providing a continuous and fast lithium-ion rapid transport channel; on the other hand, it can improve the mechanical properties of the solid electrolyte, enabling it to effectively inhibit the growth of lithium dendrites and improve the stability of the solid battery; in addition, by constructing an interface at the nanoscale, it breaks through the bottleneck of the ionic conductivity of the current solid electrolyte, and the assembled solid-state lithium battery has good electrochemical performance.

[0022] (2) The preparation method provided by the present invention is simple in operation, short in synthesis time, mild in conditions, low in cost and can be prepared on a large scale, meeting the requirements of green chemistry and being conducive to market promotion. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is the TEM image of the ultrafine nanowires described in Example 1 of the present invention;

[0025] Figure 2 It is the infrared test image of the ultrafine nanowires described in Example 1 of the present invention;

[0026] Figure 3 It is the EIS image of the gadolinium hydroxide oxide ultrafine nanowire composite electrolyte described in Example 1 of the present invention;

[0027] Figure 4 It is the Li-Li cycle image of the gadolinium hydroxide oxide ultrafine nanowire composite electrolyte described in Example 1 of the present invention;

[0028] Figure 5 It is the electrochemical test image of the button-type full battery assembled from the gadolinium hydroxide oxide ultrafine nanowire composite electrolyte of the present invention and the LiFePO4 positive electrode. Figure (a) is the specific capacity-Coulomb efficiency-cycle curve of the full battery at room temperature, and Figure (b) is the specific capacity-voltage curve of the full battery. Detailed Embodiments

[0029] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of specific embodiments of the present invention with reference to the accompanying drawings.

[0030] It should be noted that in the description of the embodiments of the present application, the description of the term "some specific embodiments" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0031] The "within... range" described in this embodiment includes the end values at both ends. For example, "within the range of 1 to 100" includes the numerical values at both ends of 1 and 100.

[0032] Nanowires have the requirements of one-dimensional materials for the aspect ratio. However, due to their hollow structure, they are a special type of one-dimensional nanomaterial. When the radial size of the nanowires reaches 1 nm, they will exhibit relatively obvious flexibility and related complex properties. 1 nm is very likely a critical size for the appearance of these properties. This material combines the unique properties of organic and inorganic materials and has the potential to become a new material that can balance the performance of both, and even exhibit more novel properties. This is of great scientific significance for establishing new applications based on new materials. However, although there are many potential opportunities in this area, it is still in the preliminary stage of research.

[0033] Based on the above exploration, the embodiments of the present invention provide a method for preparing gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, including the following steps:

[0034] S1. Dissolve gadolinium chloride in deionized water, add ethanol, and after mixing evenly, obtain a mixed solution. Add oleylamine and oleic acid to a hydrothermal reactor, stir and mix, drop in the mixed solution, and carry out a hydrothermal reaction.

[0035] S2. Add cyclohexane to the reaction system, ultrasonically disperse until the solution is transparent, then add ethanol. The prepared white flocculent precipitate is sedimented, centrifuged, washed, and dried to obtain ultrafine nanowires.

[0036] S3. Dissolve the ultrafine nanowires in an organic solvent, add a polyethylene oxide electrolyte solution, mix evenly, place it in a polytetrafluoroethylene petri dish, and dry it in a vacuum oven to obtain the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte.

[0037] Therefore, the present invention proposes a method for preparing a novel gadolinium oxyhydroxide (GdOOH) ultrafine nanowire composite solid-state lithium-ion battery electrolyte by a hydrothermal method. The present invention uses one-dimensional ultrafine nanowires as inorganic fillers. Due to their large specific surface area, they can combine with the polymer electrolyte to form fast lithium-ion channels. Because of their large aspect ratio, they are easy to interweave inside the polymer to form a three-dimensional skeleton, improving the orderliness of the lithium-ion transport route, thereby increasing the ionic conductivity of the composite solid electrolyte.

[0038] Specifically, in step S1, the dosage ratio of gadolinium chloride, ethanol, oleylamine, and oleic acid is 1 g of gadolinium chloride: 7-12 mL of ethanol: 3-5 mL of oleylamine: 1-2 mL of oleic acid. Among them, the volume ratio of oleylamine to oleic acid is (2-5):(1-3). The conditions of the hydrothermal reaction include: the reaction temperature is 120-180 °C, and the reaction time is 6-12 h.

[0039] That is, 0.2-1.0 g of gadolinium chloride (GdCl3·6H2O) is dissolved in 0.5-2 ml of deionized water, and 7.5-15 ml of ethanol is added and mixed evenly. Oleylamine and oleic acid are added to the hydrothermal reactor and stirred strongly. After mixing evenly, the above-mentioned mixed solution is slowly added dropwise. After maintaining stirring for 10-20 min, the reaction kettle is sealed. The reaction temperature is 120-180 °C, and the reaction time is 6-12 h.

[0040] Specifically, in step S2, the relationship between the mass of the product and the volume of the post-treatment liquid is 1 g of product: 200-300 mL of post-treatment liquid. Among them, the volume ratio of cyclohexane to ethanol is 1:(2-4), the sedimentation time is 1-2 h, and the rotation speed of centrifugal washing is 5000-10000 revolutions per minute.

[0041] That is, after the hydrothermal reaction is completed, cyclohexane is added for ultrasonic dispersion until the solution becomes completely transparent. Subsequently, ethanol is added, and the ultrafine nanowires precipitate as white flocs and sediment for 1-2 h. The sample is washed 2-4 times with ethanol and deionized water, and then placed in a vacuum oven to dry for 6-12 h to obtain ultrafine nanowires.

[0042] Specifically, in step S3, the preparation method of the polyethylene oxide electrolyte solution includes: dissolving polyethylene oxide (PEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in an organic solvent. Among them, the proportion of ultrafine nanowires in the total mass of the polyethylene oxide electrolyte solution is 1 wt%-10 wt%).

[0043] Preferably, the organic solvent is acetonitrile or dimethylformamide DMF.

[0044] The preparation method provided by the present invention is simple in operation, short in synthesis time, mild in conditions, low in cost, and can be prepared on a large scale, meeting the requirements of green chemistry and being conducive to market promotion.

[0045] Based on the above solution, another embodiment of the present invention provides a gadolinium hydroxide oxide ultrafine nanowire composite electrolyte, which is prepared by the above preparation method. The gadolinium hydroxide oxide ultrafine nanowire composite electrolyte includes ultrafine nanowires, polyethylene oxide, and lithium bis(trifluoromethanesulfonyl)imide.

[0046] Among them, the diameter of the ultrafine nanowires is 2 - 5 nm, and the length is 500 - 1000 nm; the thickness of the gadolinium hydroxide oxide ultrafine nanowire composite electrolyte is 50 - 100 μm.

[0047] The ultrafine nanowires with a high aspect ratio can construct a long-range continuous organic / inorganic interface in the polymer-based solid electrolyte, providing a continuous and fast lithium ion transport channel, which can improve the mechanical properties of the solid electrolyte, effectively inhibit the growth of lithium dendrites, and improve the stability of the solid-state battery.

[0048] Based on the above solution, another embodiment of the present invention provides the application of the gadolinium hydroxide oxide ultrafine nanowire composite electrolyte in a solid-state lithium ion battery.

[0049] By utilizing the properties of the ultrafine nanowires, the present invention breaks through the bottleneck of the ionic conductivity of the current solid electrolyte through the construction of a nano-scale interface. The assembled solid-state lithium battery has good electrochemical performance. In addition, by regulating and modifying the one-dimensional ultrafine nanowire material, the ionic conductivity of the organic / inorganic composite solid electrolyte is improved, which also lays a solid foundation for the development of the next generation of high-performance solid-state lithium batteries.

[0050] Based on the above embodiments, the present invention gives the following specific examples to further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions in the following examples are usually carried out according to the conditions recommended by the manufacturer. Unless otherwise stated, percentages and parts are calculated by mass.

[0051] Example 1

[0052] This example provides a preparation method of a gadolinium hydroxide oxide ultrafine nanowire composite electrolyte, including the following steps:

[0053] 1) Weigh 0.75 g of gadolinium chloride and dissolve it in 0.95 ml of deionized water, then add 11.25 ml of ethanol and mix evenly; weigh 3.85 ml of oleylamine and 1.85 ml of oleic acid in a 25 ml hydrothermal reactor, stir and mix evenly, and then slowly add the mixed solution containing gadolinium chloride under stirring. After maintaining stirring for 15 min, seal the reaction kettle and react at 160 °C for 8 h;

[0054] 2) After the reaction is completed, wait for the temperature of the reaction kettle to naturally cool down to room temperature. Transfer the product in the kettle to a centrifuge tube, add 15 ml of cyclohexane and disperse it by ultrasonic wave, and then add 25 ml of ethanol; sediment the sample, centrifuge and wash the sample 3 times at 7000 revolutions per minute, and then place it in a vacuum oven to dry for 8 h to obtain ultrafine nanowires;

[0055] 3) Disperse 0.066 g of ultrafine nanowires with 7 ml of acetonitrile and ultrasonicate until completely transparent; dissolve 0.75 g of polyethylene oxide (PEO) and 0.56 g of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) with 9 ml of acetonitrile solvent, heat and stir to obtain a PEO polymer electrolyte solution, and mix it with the ultrafine nanowire solution after it becomes completely transparent; after mixing into a uniform solution, pour it into a polytetrafluoroethylene petri dish and place it in a vacuum oven to dry to obtain a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte.

[0056] Taking the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte prepared in Example 1 as an example, its morphology and structure were characterized to obtain Figures 1-4 the result diagram shown.

[0057] Figure 1 is the transmission electron microscope TEM image of the ultrafine nanowires. It can be seen from Figure 1 that the ultrafine nanowires are in a one-dimensional structure, orderly distributed, with a diameter of 3.5 nm and a length of 800 nm.

[0058] Figure 2 is the infrared test image of the ultrafine nanowires described in Example 1 of the present invention. It can be seen from Figure 2 that the peaks appearing at wavelengths of 3000 and 1500 represent the oleylamine oleic acid organic molecules on the surface of the ultrafine nanowires.

[0059] The GdOOH nanowires synthesized by the oleylamine oleic acid system in the present invention have many bent places under transmission electron microscope observation. The bending degree and direction are different, and they will not crack at the bent places, which to a certain extent shows the flexibility of the nanowires.

[0060] Figure 3 is the electrochemical impedance spectroscopy EIS image of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, Figure 4 is the Li-Li cycle image of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte. It can be seen from Figure 3 and 4 that the ionic conductivity reaches 2×10 -4 S cm -1 , and the polarization voltage of the lithium-lithium cycle is 55 mV.

[0061] Figure 5Electrochemical test chart of a button-type all-solid-state battery assembled with a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte and a LiFePO4 cathode. Among them, Figure (a) is the specific capacity-Coulomb efficiency-cycle curve of the all-solid-state battery at room temperature, and Figure (b) is the specific capacity-voltage curve of the all-solid-state battery. It can be seen from the figure that the capacity of the solid-state lithium battery using lithium iron phosphate as the cathode is 140 mAh g at a current density of 0.5C. -1 。

[0062] The above electrochemical tests show that the small size of the ultrafine nanowires and their uniform composite with the polymer electrolyte can construct a continuous and large-scale organic / inorganic efficient lithium-ion transport interface, improving the ionic conductivity of the composite solid electrolyte and the cycle stability of the solid-state lithium battery.

[0063] Example 2

[0064] This example provides a preparation method of a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, which is different from Example 1 in that:

[0065] In step 5), 0.040 g of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte was dispersed in 7 ml of acetonitrile; the remaining steps and parameters were the same as those in Example 1.

[0066] Electrochemical tests were carried out on the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte prepared in Example 2. The ionic conductivity of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte reached 1.6×10 -4 S cm -1 , the lithium-lithium cycle polarization voltage was 65 mV, and the capacity of the solid-state lithium battery using lithium iron phosphate as the cathode was 132 mAh g at a current density of 0.5C. -1 。

[0067] Example 3

[0068] This example provides a preparation method of a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte, which is different from Example 1 in that:

[0069] In step 5), 0.092 g of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte was dispersed in 7 ml of acetonitrile; the remaining steps and parameters were the same as those in Example 1.

[0070] Electrochemical tests were carried out on the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte prepared in Example 3. The ionic conductivity of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte reached 1.8×10 -4 S cm -1 , the lithium-lithium cycle polarization voltage was 70 mV, and the capacity of the solid-state lithium battery using lithium iron phosphate as the cathode was 135 mAh g at a current density of 0.5C. -1 。

[0071] Example 4

[0072] This example provides a method for preparing gadolinium hydroxide ultrafine nanowire composite electrolyte. The difference from Example 1 is as follows:

[0073] In step 2), 2.7 ml of oleylamine and 1.3 ml of oleic acid were weighed and stirred evenly in a 25 ml hydrothermal reactor; the remaining steps and parameters were the same as those in Example 1.

[0074] Regarding the morphological analysis of the gadolinium hydroxide ultrafine nanowire composite electrolyte prepared in Example 4, the diameter of the ultrafine nanowires is 50 nm and the length is 800 nm.

[0075] Electrochemical tests were carried out on the gadolinium hydroxide ultrafine nanowire composite electrolyte prepared in Example 4. The ionic conductivity of the gadolinium hydroxide ultrafine nanowire composite electrolyte reached 1.8×10 -4 S cm -1 , the lithium-lithium cycling polarization voltage was 7 mV, and the capacity of the solid-state lithium battery using lithium iron phosphate as the positive electrode was 130 mAh g -1 .

[0076] Example 5

[0077] This example provides a comparative example. Pure PEO and LiTFSI were compounded. The preparation method of the composite solid electrolyte includes:

[0078] 1) Dissolve 0.75 g of polyethylene oxide (PEO) and 0.56 g of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in 9 ml of acetonitrile solvent, and heat and stir to obtain a PEO polymer electrolyte solution;

[0079] 2) Pour the solution into a polytetrafluoroethylene petri dish, and then place it in a vacuum oven to dry to obtain a composite solid electrolyte.

[0080] Electrochemical tests were carried out on the solid electrolyte obtained in Example 5. Its ionic conductivity reached 1×10 -6 S cm -1 , the lithium-lithium cycling polarization voltage was 170 mV, and the capacity of the solid-state lithium battery using lithium iron phosphate as the positive electrode was 60 mAh g -1 . It can be seen that the composite electrolyte without adding inorganic ultrafine nanowires has a low ionic conductivity and a large impedance, making it difficult to ensure the efficient operation of the solid-state lithium battery.

[0081] From the above examples, it can be seen that the gadolinium hydroxide ultrafine nanowire composite electrolyte provided by the present invention has interface stability and excellent electrochemical performance.

[0082] Although the present invention is disclosed as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. A preparation method of gadolinium hydroxyoxide ultrafine nanowire composite electrolyte, characterized in that, The steps include: S1. Dissolve gadolinium chloride in deionized water, add ethanol, and mix thoroughly to obtain a mixed solution. Add oleylamine and oleic acid to a hydrothermal kettle, stir and mix, and then dropwise add the mixed solution to perform a hydrothermal reaction. The mass volume ratio of the gadolinium chloride, the ethanol, the oleylamine, and the oleic acid is 1 g:(7-12) mL:(3-5) mL:(1-2) mL, wherein the volume ratio of the oleylamine to the oleic acid is (5-3):(1-2). S2. Add cyclohexane to the reaction system and ultrasonically disperse until the solution becomes transparent, then add ethanol, and the resulting white flocculent is allowed to settle, centrifuged, washed, and dried to obtain ultrafine nanowires; the volume ratio of the cyclohexane to the ethanol is 1:(2-4); S3. Dissolve the ultrafine nanowires in an organic solvent, add a polyethylene oxide electrolyte solution, wherein the ultrafine nanowires account for 1 wt% to 10 wt% of the total mass of the polyethylene oxide electrolyte solution, mix well, place in a polytetrafluoroethylene culture dish, and dry in a vacuum oven to obtain a gadolinium oxyhydroxide ultrafine nanowire composite electrolyte.

2. The preparation method according to claim 1, wherein The conditions of the hydrothermal reaction include: reaction temperature of 120-180° C., and reaction time of 6-12 h.

3. The preparation method according to claim 1, characterized in that, In step S2, the sedimentation time is 1-2 hours, and the rotation speed of the centrifugal washing is 5000-10000 rpm.

4. The preparation method according to claim 1, wherein In step S3, the method for preparing the polyethylene oxide electrolyte solution includes: dissolving polyethylene oxide and lithium bis(trifluoromethanesulfonyl)imide in the organic solvent.

5. A gadolinium hydroxyoxide ultrafine nanowire composite electrolyte, characterized in that, The gadolinium oxyhydroxide ultrafine nanowire composite electrolyte is prepared by the preparation method of any one of claims 1 to 4, wherein the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte comprises ultrafine nanowires, polyethylene oxide and lithium bis(trifluoromethanesulfonyl)imide.

6. The gadolinium hydroxide oxide ultrafine nanowire composite electrolyte according to claim 5, characterized in that, The diameter of the ultrafine nanowire is 2-5 nm, and the length is 500-1000 nm; the thickness of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte is 50-100 μm.

7. Use of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte obtained by the preparation method according to any one of claims 1 to 4 in a solid-state lithium-ion battery.

8. Use of the gadolinium oxyhydroxide ultrafine nanowire composite electrolyte according to claim 5 or 6 in a solid-state lithium-ion battery.

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