A coated binder material, a preparation method thereof, and a solid-state battery

Abstract

The present invention belongs to the technical field of batteries, and discloses a coated binder material, a preparation method thereof, and a solid-state battery. The coated binder material of the present invention comprises a binder, an ionic plastic crystal, and a lithium salt, and the ionic plastic crystal and the lithium salt are coated on the surface of the binder. By coating the surface of the binder with the ionic plastic crystal and the lithium salt, the coated binder material of the present invention has good lithium conduction performance, which can increase the lithium conduction performance inside the solid-state battery and reduce the interfacial impedance inside the battery, thereby improving the battery performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a coated binder material, a preparation method thereof, and a solid-state battery. Background Art

[0002] Lithium-ion batteries have the advantages of high working voltage, low self-discharge rate, large specific capacity, long cycle life, no memory effect, and little environmental pollution. Nowadays, they have been widely used in various small portable chemical power supply devices and have become a new type of power source with great development potential in the world today. Commercial lithium-ion batteries generally use liquid electrolytes. Due to the disadvantages of poor thermal stability, easy volatilization, and leakage problems of liquid electrolytes, people have focused some research on solid electrolytes that can fundamentally replace organic liquid electrolytes. Solid-state batteries composed of solid electrolytes have the advantages of high energy density, good safety performance, and long cycle life.

[0003] Sulfide solid-state batteries have the advantages of high ionic conductivity, no use of organic solvents in the electrolyte layer, and broad commercial prospects. At present, they have become a popular research direction in the field of solid-state batteries. However, the binders used in the batteries do not have lithium-conducting properties and only play the role of binding active materials, conductive carbon, and sulfide solid electrolytes. When the content of the added binder is relatively high, it will inevitably affect the conductivity of the battery. How to make the binder have certain lithium-conducting properties and reduce the influence of the introduction of the binder on the battery performance has become an urgent problem to be solved. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above prior art. For this purpose, the present invention provides a coated binder material, a preparation method thereof, and a solid-state battery. The coated binder material has good lithium-conducting properties, can increase the lithium-conducting performance inside the solid-state battery, reduce the interfacial impedance inside the solid-state battery, and thus improve the performance of the solid-state battery.

[0005] In the first aspect of the present invention, there is provided a coated binder material, which includes a binder, an ionic plastic crystal, and a lithium salt, and the ionic plastic crystal and the lithium salt are coated on the surface of the binder.

[0006] In some embodiments of the present invention, the total mass of the ionic plastic crystal and the lithium salt accounts for 5-15% of the mass of the coated binder material, preferably 8-12%, and more preferably 10%.

[0007] In some embodiments of the present invention, the mass of the binder accounts for 85-95% of the mass of the coated binder material, preferably 88-92%, and more preferably 90%.

[0008] In some embodiments of the present invention, the mass ratio of the lithium salt to the ionic plastic crystal is 1:(2 - 8), preferably 1:(4 - 6), and more preferably 1:5.

[0009] In some embodiments of the present invention, the ionic plastic crystal is composed of an anion and a cation; the anion includes bis(fluorosulfonyl)imide ion and / or bis(trifluoromethylsulfonyl)imide ion; the cation includes at least one of N,N-diethylpyrrolidinium ion, N-ethyl-N-methylpyrrolidinium ion, N,N-dimethylpyrrolidinium ion, N-methylpyridinium ion, N-ethyl-N-methylpiperidinium ion, 3,3-dimethyloxazolidinium ion, 4-ethyl-4-methylmorpholinium ion, 4-isobutyl-4-methylmorpholinium ion, tetramethylammonium ion, tetraethylammonium ion, tetrabutylammonium ion, tetramethylphosphonium ion, tetraethylphosphonium ion, and tetrabutylphosphonium ion.

[0010] In some embodiments of the present invention, the ionic plastic crystal includes at least one of tetramethylammonium bis(fluorosulfonyl)imide, tetraethylammonium bis(fluorosulfonyl)imide, N,N-dimethylpyrrolidinium bis(fluorosulfonyl)imide, and N,N-diethylpyrrolidinium bis(fluorosulfonyl)imide.

[0011] In some embodiments of the present invention, the molar ratio of the anion to the cation is 1:1.

[0012] In some embodiments of the present invention, the binder includes at least one of butadiene rubber (BR), hydrogenated butadiene rubber (HBR), styrene-butadiene rubber (SBR), hydrogenated styrene-butadiene rubber (HSBR), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), sodium carboxymethyl cellulose (CMC), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), and polytetrafluoroethylene (PTFE)); the lithium salt includes lithium bis(trifluoromethanesulfonyl)imide and / or lithium bis(fluorosulfonyl)imide (LiFSI).

[0013] In the second aspect of the present invention, there is provided a method for preparing the coated binder material described in the first aspect of the present invention, comprising the following steps:

[0014] Disperse the binder in a solvent, then add the ionic plastic crystal and the lithium salt, stir, and then remove the solvent and dry to obtain the coated binder material.

[0015] In some embodiments of the present invention, the solvent includes at least one of toluene, dichloromethane, tetrahydrofuran, acetonitrile, ethanol, acetone, ethyl acetate, butyl butyrate, anisole, isobutyl isobutyrate, N,N-dimethylformamide, and N-methylpyrrolidone.

[0016] In some embodiments of the present invention, the dispersion is ultrasonic dispersion, and the time of the ultrasonic dispersion is 10 to 60 min, preferably 20 to 40 min, and more preferably 30 min.

[0017] In some embodiments of the present invention, the stirring is carried out at room temperature (about 25 °C), and the time of the stirring is 20 to 30 h, preferably 22 to 26 h, and more preferably 24 h.

[0018] In some embodiments of the present invention, the removal of the solvent is by rotary evaporation.

[0019] In some embodiments of the present invention, the temperature of the drying is 60 to 100 °C, preferably 60 to 80 °C, and more preferably 60 °C; the time of the drying is 20 to 30 h, preferably 22 to 26 h, and more preferably 24 h.

[0020] The present invention prepares a coated binder material by a wet coating method. The coating principle is as follows: in a solvent, ionic plastic crystals and lithium salts are soluble, while the binder is insoluble. When the solvent is completely removed by rotary evaporation, the ionic plastic crystals and lithium salts dissolved in the solvent precipitate on the surface of the binder, thereby obtaining the coated binder material.

[0021] In the third aspect of the present invention, a solid-state battery is provided, and the solid-state battery includes the coated binder material described in the first aspect of the present invention.

[0022] In some embodiments of the present invention, the solid-state battery includes a positive electrode sheet, a sulfide solid electrolyte, and a negative electrode sheet. The positive electrode sheet includes a positive electrode active material and the coated binder material described in the first aspect of the present invention.

[0023] In some embodiments of the present invention, the positive electrode active material includes a ternary material of NCM (nickel cobalt manganese), a ternary material of NCA (nickel cobalt aluminum), lithium cobaltate, lithium iron phosphate, or a lithium-rich manganese-based material.

[0024] In some embodiments of the present invention, the particle size of the positive electrode active material is 2 to 15 μm.

[0025] In some embodiments of the present invention, the positive electrode sheet further includes a sulfide solid electrolyte and a conductive agent.

[0026] In some embodiments of the present invention, the sulfide solid electrolyte includes at least one of Li3PS4, Li4P2S6, and Li 7- a PS 6-a X a wherein X includes at least one of Cl, Br, and I, and the value of a is 0.5 to 2.

[0027] In some embodiments of the present invention, the positive electrode plate is prepared by a wet method or a dry method, and preferably by a dry method.

[0028] In some embodiments of the present invention, the positive electrode plate is prepared by a wet method, including the following steps:

[0029] S1. Add the positive electrode active material, sulfide solid electrolyte, conductive agent, and the coated binder material described in the first aspect of the present invention into a solvent, stir, and prepare a slurry;

[0030] S2. Coat the slurry on the carbon-coated aluminum foil and dry it in vacuum to obtain a preliminary positive electrode;

[0031] S3. Roll and thin the preliminary positive electrode to obtain the positive electrode plate.

[0032] In some embodiments of the present invention, the rolling speed for rolling and thinning is 1 - 3 m / min, the temperature of the roller is 50 - 60 °C, and the thickness of the positive electrode plate after rolling and thinning is 80 - 100 μm.

[0033] In some embodiments of the present invention, the positive electrode plate is prepared by a dry method, including the following steps:

[0034] Mix the positive electrode active material, sulfide solid electrolyte, conductive agent, and the coated binder material described in the first aspect of the present invention, and perform rolling and slicing at 40 - 60 °C to obtain the positive electrode plate.

[0035] In some embodiments of the present invention, the mass ratio of the positive electrode active material, sulfide solid electrolyte, conductive agent, and the coated binder material described in the first aspect of the present invention is (60 - 80):(20 - 40):3:(1 - 3).

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] The coated binder material provided by the present invention has good lithium conduction performance by ion plastic crystal and lithium salt coating on the surface of the binder, which can increase the lithium conduction performance inside the solid-state battery, reduce the interfacial impedance inside the battery, and thus improve the battery performance. Description of the Drawings

[0038] Figure 1 It is the SEM image of the existing binder PVDF;

[0039] Figure 2 It is the SEM image of the coated binder material prepared in Example 1;

[0040] Figure 3Microscopic schematic diagram of the positive electrode sheet prepared with the existing conventional binder PVDF of Comparative Example 1;

[0041] Figure 4 Microscopic schematic diagram of the positive electrode sheet prepared with the coated binder material of Example 1. Detailed Description of the Invention

[0042] The content of the present invention will be further described in detail through specific examples below. The raw materials, reagents or devices used in the examples can be obtained from conventional commercial channels or by existing technical methods without special instructions. Unless otherwise specified, the test or measurement methods are conventional methods in the art.

[0043] Example 1

[0044] A coated binder material, which includes a binder, an ionic plastic crystal and a lithium salt, and the ionic plastic crystal and the lithium salt are coated on the surface of the binder; wherein, the binder is selected from PVDF, the ionic plastic crystal is selected from tetramethylammonium bis(fluorosulfonyl)imide (N1111FSI), the lithium salt is selected from LiFSI, the total mass of N1111FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of PVDF accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to N1111FSI is 1:5.

[0045] The specific preparation method of the coated binder material of this example is as follows:

[0046] Add PVDF to butyl butyrate, ultrasonically disperse for 30 min, then add N1111FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0047] Perform electron microscopy scanning on the existing binder PVDF selected in Example 1 and the obtained coated binder material, as Figure 1 (SEM image of the existing binder PVDF) and Figure 2 (SEM image of the coated binder material) shown; from Figure 1 and Figure 2 It can be seen that the ionic plastic crystal and the lithium salt can be coated on the surface of the binder.

[0048] Example 2

[0049] A coated binder material, which includes a binder, ionic plastic crystals, and a lithium salt. The ionic plastic crystals and the lithium salt are coated on the surface of the binder. Among them, the binder is selected from NBR, the ionic plastic crystals are selected from N1111FSI, the lithium salt is selected from LiFSI. The total mass of N1111FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of NBR accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to N1111FSI is 1:5.

[0050] The specific preparation method of the coated binder material in this example is as follows:

[0051] Add NBR to butyl butyrate, ultrasonically disperse for 30 min, then add N1111FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0052] Example 3

[0053] A coated binder material, which includes a binder, ionic plastic crystals, and a lithium salt. The ionic plastic crystals and the lithium salt are coated on the surface of the binder. Among them, the binder is selected from SBR, the ionic plastic crystals are selected from N1111FSI, the lithium salt is selected from LiFSI. The total mass of N1111FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of SBR accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to N1111FSI is 1:5.

[0054] The specific preparation method of the coated binder material in this example is as follows:

[0055] Add SBR to butyl butyrate, ultrasonically disperse for 30 min, then add N1111FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0056] Example 4

[0057] A coated binder material, which includes a binder, ionic plastic crystals, and a lithium salt. The ionic plastic crystals and the lithium salt are coated on the surface of the binder. Among them, the binder is selected from PVDF-HFP, the ionic plastic crystals are selected from N1111FSI, the lithium salt is selected from LiFSI. The total mass of N1111FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of PVDF-HFP accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to N1111FSI is 1:5.

[0058] The specific preparation method of the coated binder material in this example is as follows:

[0059] Add PVDF-HFP into butyl butyrate, ultrasonically disperse for 30 min, then add N1111FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0060] Example 5

[0061] A coated binder material, which comprises a binder, an ionic plastic crystal and a lithium salt, and the ionic plastic crystal and the lithium salt are coated on the surface of the binder; wherein, the binder is selected from PTFE, the ionic plastic crystal is selected from N1111FSI, the lithium salt is selected from LiFSI, the total mass of N1111FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of PTFE accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to N1111FSI is 1:5.

[0062] The specific preparation method of the coated binder material in this example is as follows:

[0063] Add PTFE into butyl butyrate, ultrasonically disperse for 30 min, then add N1111FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0064] Example 6

[0065] A coated binder material, which comprises a binder, an ionic plastic crystal and a lithium salt, and the ionic plastic crystal and the lithium salt are coated on the surface of the binder; wherein, the binder is selected from PVDF, the ionic plastic crystal is selected from N,N-diethylpyrrolidinium bis(fluorosulfonyl)imide (P22FSI), the lithium salt is selected from LiFSI, the total mass of P22FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of PVDF accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to P22FSI is 1:5.

[0066] The specific preparation method of the coated binder material in this example is as follows:

[0067] Add PVDF into butyl butyrate, ultrasonically disperse for 30 min, then add P22FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0068] Example 7

[0069] A coated binder material, which includes a binder, ionic plastic crystals, and a lithium salt. The ionic plastic crystals and the lithium salt are coated on the surface of the binder. Among them, the binder is selected from PVDF, the ionic plastic crystals are selected from N,N-dimethylpyrrolidinium bis(fluorosulfonyl)imide (P11FSI), the lithium salt is selected from LiFSI. The total mass of P11FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of PVDF accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to P11FSI is 1:5.

[0070] The specific preparation method of the coated binder material in this example is as follows:

[0071] Add PVDF into butyl butyrate, ultrasonically disperse for 30 min, then add P11FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0072] Example 8

[0073] A coated binder material, which includes a binder, ionic plastic crystals, and a lithium salt. The ionic plastic crystals and the lithium salt are coated on the surface of the binder. Among them, the binder is selected from PVDF, the ionic plastic crystals are selected from tetraethylammonium bis(fluorosulfonyl)imide (N2222FSI), the lithium salt is selected from LiFSI. The total mass of N2222FSI and LiFSI accounts for 10% of the mass of the coated binder material, the mass of PVDF accounts for 90% of the mass of the coated binder material, and the mass ratio of LiFSI to N2222FSI is 1:5.

[0074] The specific preparation method of the coated binder material in this example is as follows:

[0075] Add PVDF into butyl butyrate, ultrasonically disperse for 30 min, then add N2222FSI and LiFSI, stir at room temperature for 24 h, then remove butyl butyrate by rotary evaporation, and dry at 60 °C for 24 h to obtain the coated binder material.

[0076] In the above Examples 1 to 5, the same ionic plastic crystals are used to coat different kinds of binders; in Examples 6 to 8, different kinds of ionic plastic crystals are used to coat the same binder.

[0077] Comparative Example 1

[0078] Existing conventional binder PVDF.

[0079] Comparative Example 2

[0080] The difference from Example 1 is only that in Comparative Example 2, the ionic plastic crystal is replaced with the molecular plastic crystal succinonitrile (SN) in equal amounts; the other raw materials, contents, and preparation methods are the same as those in Example 1.

[0081] Comparative Example 3

[0082] The difference from Example 1 is only that in Comparative Example 3, no coating is performed, and the binder, ionic plastic crystal, and lithium salt are simply mixed evenly.

[0083] Comparative Example 4

[0084] The currently commercial lithium-conducting binder, lithium polyacrylate (PAALi), is used.

[0085] Solid-state battery performance test

[0086] The coated binder materials prepared in Examples 1 to 8 and the binders in Comparative Examples 1 to 4 were assembled into solid-state batteries. The specific assembly method is as follows:

[0087] I. Preparation of the positive electrode sheet

[0088] 1. The coated binder materials in Examples 1 to 4, 6 to 8 and the binders in Comparative Examples 1 to 4 were used to prepare the positive electrode sheet by the wet method:

[0089] S1. The positive electrode active material (NCM622), sulfide solid electrolyte (Li3PS4), conductive agent (VGCF), and binder were added to butyl butyrate in a mass ratio of 70:30:3:3 and stirred thoroughly for 24 h;

[0090] S2. The mixed slurry was coated on carbon-coated aluminum foil and vacuum-dried in a vacuum oven at 70 °C for 48 h to obtain a preliminary positive electrode;

[0091] S3. The preliminary positive electrode was placed in a pair-roll press for roll pressing and thinning treatment. The roll speed of the roll press was 1.5 m / min, the temperature of the roll wheels was 50 °C, the thickness after roll pressing was 90 μm, and the positive electrode sheet was cut out and placed in a solid-state battery mold;

[0092] 2. The coated binder material in Example 5 was used to prepare the positive electrode sheet by the dry method:

[0093] The positive electrode active material (NCM622), sulfide solid electrolyte (Li3PS4), conductive agent (VGCF), and binder were added to a mortar in a mass ratio of 70:30:3:1, mixed thoroughly, and roll-pressed and mixed evenly on a heating table at 50 °C, sliced to obtain a positive electrode sheet, and placed in a solid-state battery mold;

[0094] II. Preparation of the sulfide solid electrolyte

[0095] Weigh a certain mass of sulfide solid electrolyte and place it in a solid-state battery mold equipped with a positive electrode plate;

[0096] III. Preparation of the negative electrode plate

[0097] The negative electrode is a lithium metal electrode plate. A 50-μm-thick lithium metal strip is die-cut to obtain the negative electrode plate, which is then placed in a solid-state battery mold equipped with a positive electrode plate and a sulfide solid electrolyte;

[0098] IV. Assembly of the solid-state battery

[0099] Press the solid-state battery mold equipped with the positive electrode plate, sulfide solid electrolyte, and negative electrode plate with a pressure of 4 t to assemble the solid-state battery.

[0100] See Figure 3 ( Figure 3 is a microscopic schematic diagram of the positive electrode plate prepared using the existing conventional binder PVDF in Comparative Example 1). In the positive electrode plate 100, 11 is the sulfide solid electrolyte, 12 is the positive electrode active material, 13 is the binder, and 14 is the conductive agent. Since the existing binder used does not have lithium-conducting properties, the binder network inside the positive electrode plate 100 will increase the impedance of the entire battery.

[0101] See Figure 4 ( Figure 4 is a microscopic schematic diagram of the positive electrode plate prepared using the coated binder material in Example 1). In the positive electrode plate 200, 21 is the coated binder material. Since the binder network inside the positive electrode plate 200 has lithium-conducting properties, the transport resistance of lithium ions is reduced, and the battery performance is improved.

[0102] Solid-state battery performance test method:

[0103] 1. Interface impedance: After the solid-state battery is assembled, test the EIS of the battery on an electrochemical workstation, with an amplitude of 10 mV and a frequency of 1 - 10 6 Hz;

[0104] 2. First Coulombic efficiency: Charge and discharge the solid-state battery at a rate of 0.1C. The first Coulombic efficiency = first discharge capacity / first charge capacity × 100%;

[0105] 3. Cycling performance: At room temperature, test the cycling performance of the solid-state battery under the condition of 0.1C. When the discharge capacity is lower than 80% of the first discharge capacity, it is considered the end of life.

[0106] The test results of the above interface impedance, first Coulombic efficiency, and cycling performance are shown in Table 1.

[0107] Table 1

[0108] Sample group Interface impedance / Ω Initial Coulomb efficiency / % 0.1C cycle life / cycles Example 1 109 83.6 105 Example 2 105 83.9 101 Example 3 125 82.3 99 Example 4 113 84.6 108 Example 5 119 85.9 105 Example 6 126 84.3 98 Example 7 130 85.1 111 Example 8 124 84.2 105 Comparative example 1 160 80.6 85 Comparative example 2 175 78.1 70 Comparative example 3 155 81.0 75 Comparative example 4 145 82.0 85

[0109] As can be seen from Table 1, for the solid-state battery assembled with the coated binder material of the present invention, the interfacial impedance inside the battery is significantly reduced, the cycling performance is significantly improved, and the initial Coulombic efficiency is also higher.

[0110] The preferred embodiments of the present invention have been specifically described above. However, the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A coated adhesive material, characterized in that: The coated binder material comprises a binder, an ion plastic crystal and a lithium salt, wherein the ion plastic crystal and the lithium salt are coated on the surface of the binder; The ion plasticizer is composed of anions and cations; the anions are bis(fluorosulfonyl)imide ions and / or bis(trifluoromethylsulfonyl)imide ions; the cations are at least one of N,N-diethylpyrrolidinium ion, N-ethyl-N-methylpyrrolidinium ion, N,N-dimethylpyrrolidinium ion, N-methylpyridinium ion, N-ethyl-N-methylpiperidinium ion, 3,3-dimethyloxazolidinium ion, 4-ethyl-4-methylmorpholinium ion, 4-isobutyl-4-methylmorpholinium ion, tetramethylammonium ion, tetraethylammonium ion, tetrabutylammonium ion, tetramethylphosphonium ion, tetraethylphosphonium ion and tetrabutylphosphonium ion; The binder is at least one of butadiene rubber, hydrogenated butadiene rubber, styrene-butadiene rubber, hydrogenated styrene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber, sodium carboxymethyl cellulose, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer and polytetrafluoroethylene; The lithium salt includes lithium bis(trifluoromethanesulfonyl)imide and / or lithium bis(fluorosulfonyl)imide; The total mass of the ion plastic crystal and the lithium salt accounts for 5-15% of the mass of the coated binder material; The mass ratio of the lithium salt to the ion plastic crystal is 1:(2~8).

2. The coated adhesive material according to claim 1, characterized in that: The ionic crystal shaping agent includes at least one of tetramethylammonium bis(fluorosulfonyl)imide, tetraethylammonium bis(fluorosulfonyl)imide, N,N-dimethylpyrrolidinium bis(fluorosulfonyl)imide and N,N-diethylpyrrolidinium bis(fluorosulfonyl)imide.

3. The coated adhesive material according to claim 1, characterized in that: The molar ratio of the anion to the cation is 1:

1.

4. The method for preparing the coated binder material according to any one of claims 1 to 3, characterized in that: The following steps are involved: The binder is dispersed in a solvent, and then ion plastic crystals and lithium salts are added, stirred, and then the solvent is removed and dried to obtain a coated binder material.

5. The preparation method according to claim 4, characterized in that: The solvent includes at least one of toluene, dichloromethane, tetrahydrofuran, acetonitrile, ethanol, acetone, ethyl acetate, butyl butyrate, anisole, isobutyl isobutyrate, N,N-dimethylformamide and N-methylpyrrolidone.

6. A solid-state battery, characterized in that: The solid-state battery comprises the coated binder material according to any one of claims 1 to 3.

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