A polymer solid electrolyte containing soluble additives and all-solid-state metal lithium battery

Abstract

The present invention discloses a polymer solid electrolyte containing a soluble additive and an all-solid-state metal lithium battery. The polymer solid electrolyte comprises a polymer matrix, a metal lithium salt and a soluble additive, and the soluble additive is 4-(trifluoromethyl)phenylboronic acid and succinonitrile. The present invention provides an all-solid-state metal lithium battery containing the polymer solid electrolyte. The present invention uses TFPBA and SN as soluble additives of the solid electrolyte, which can realize the protection of the negative electrode of the all-solid-state metal lithium battery and the widening of the electrochemical oxidation window, thereby realizing a significant improvement in the cycle performance of the all-solid-state metal lithium battery; the reaction activity of the metal negative electrode can be greatly reduced, and the electrochemical oxidation window of the PEO-based solid electrolyte can be effectively widened, thereby obtaining an all-solid-state metal lithium battery with excellent cycle performance and long-term stability. In addition, the additive has a low cost and is convenient and quick to operate.

Description

Technical Field

[0001] The present invention belongs to the technical field of secondary batteries, and in particular relates to a polymer solid electrolyte containing a soluble additive and an all-solid-state metal lithium battery. Background Art

[0002] In recent years, lithium-ion secondary batteries have been widely used in our lives, but with the development of the transportation and energy storage industries, various fields of energy storage are still pursuing energy storage systems with higher energy density and high safety. Compared with traditional lithium-ion battery systems, all-solid-state metal lithium battery systems have attracted much attention due to their high energy density, high safety, wide electrochemical window, high specific energy, and wide range of positive electrode material selection. They are one of the most promising electrochemical energy storage systems.

[0003] However, although all-solid-state metal lithium batteries have high safety, high energy density, wide electrochemical window and can be widely matched with high-voltage cathode materials, there are also some problems that need to be solved. At present, although polymer solid electrolyte materials have high flexibility and high stability between electrodes and electrolytes, they are also light in weight, easy to process and suitable for large-scale manufacturing. However, the ionic conductivity of polymer solid electrolytes is generally low (10 -5 ~10 -6 S cm -2 ), low ion migration number (0.1-0.2), narrow electrochemical window (0-3.8V) and weak mechanical strength, which seriously limit its use in all-solid-state metal lithium batteries. There are two traditional methods for modifying polymer solid electrolytes. One is to blend and copolymerize with organic polymers. In this strategy, the synthesis of electrolyte materials is cumbersome and difficult to design, and the copolymerization reaction is incomplete and some by-products are generated. The second is to mix with insoluble inorganic fillers. This strategy has problems such as uneven mixing, easy agglomeration, and blocking of lithium ion migration channels. Compounds containing elements such as F, B, and P have excellent film-forming ability and are widely used as film-forming additives. They can form a stable and dense SEI layer at the interface between the negative electrode and the electrolyte. TFPBA is a chemical material intermediate with a structure of a boronic acid group and a methyl group substituted with three fluorine atoms on the benzene ring. It has certain Lewis acidity, good stability and large dielectric anisotropy. TFPBA is often used in the fields of biomedicine, organic synthesis and pesticide chemicals, and is widely used in liquid crystal display materials. So far, it has not been found to be used as a soluble additive in polymer solid electrolytes. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a polymer solid electrolyte containing a soluble additive.

[0005] The second technical problem to be solved by the present invention is to provide an all-solid-state metal lithium battery.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a polymer solid electrolyte containing a soluble additive, wherein the polymer solid electrolyte comprises a polymer matrix, a metal lithium salt and a soluble additive, wherein the soluble additive is 4-(trifluoromethyl)phenylboronic acid (TFPBA) and succinonitrile (SN), wherein the mass of 4-(trifluoromethyl)phenylboronic acid is 1-10% of the total mass of the polymer matrix and the metal lithium salt, when the polymer matrix is ​​a homopolymer, the molecular weight of the polymer matrix is ​​calculated based on the molecular weight of the monomer contained therein, and the molar ratio of succinonitrile to the polymer matrix is ​​1:4-1:16; when the polymer matrix is ​​a copolymer, the mass ratio of succinonitrile to the polymer matrix is ​​1:2-1:6.

[0008] The polymer solid electrolyte of the present invention, wherein the polymer matrix and the metal lithium salt are both conventional components, and the ratio thereof can also be conventional, and those skilled in the art can select the polymer matrix and the metal lithium salt and determine the content of the two according to actual needs. Specifically, the metal lithium salt can be one or more of lithium perchlorate, lithium hexafluorophosphate, and lithium bis(trifluoromethanesulfonyl imide), and the polymer matrix can be selected from polyethylene oxide (PEO), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), etc. Generally speaking, when the polymer matrix is ​​a homopolymer such as polyethylene oxide (PEO), polyacrylonitrile (PAN) or polymethyl methacrylate (PMMA), the molar ratio of the polymer matrix to the metal salt is set to 10:1-20:1, and the molecular weight of the polymer matrix is ​​based on the molecular weight of the monomers contained therein; when the polymer matrix is ​​a copolymer such as poly(vinylidene fluoride-co-hexafluoropropylene), the mass ratio of the polymer matrix to the lithium salt is generally 1:0.4-1.6, preferably 1:0.8.

[0009] Preferably, the polymer solid electrolyte containing a soluble additive consists of a polymer matrix, a metal lithium salt and a soluble additive.

[0010] Preferably, the mass of 4-(trifluoromethyl)phenylboronic acid is 5-10% of the total mass of the polymer matrix and the metal lithium salt, most preferably 10%.

[0011] Preferably, when the polymer is a homopolymer, the molar ratio of succinonitrile to the polymer matrix is ​​1:8.

[0012] The polymer solid electrolyte containing soluble additives described in the present invention can be prepared by conventional methods, that is, firstly, the polymer matrix, the metal lithium salt and the soluble additive are fully stirred and mixed in a volatile solvent, the obtained mixture is poured into a mold, and the mixture is allowed to stand at room temperature to allow the solvent to evaporate naturally, and finally vacuum dried to obtain the polymer solid electrolyte containing the soluble additive.

[0013] In a second aspect, the present invention provides an all-solid-state metal lithium battery, comprising:

[0014] The polymer solid electrolyte containing a soluble additive as described in the first aspect: that is, the polymer solid electrolyte comprises a polymer matrix, a metal lithium salt and a soluble additive, wherein the soluble additive is 4-(trifluoromethyl)phenylboronic acid (TFPBA) and succinonitrile (SN), wherein the mass of 4-(trifluoromethyl)phenylboronic acid is 1-10% of the total mass of the polymer matrix and the metal salt, and the molar ratio of succinonitrile to the polymer matrix is ​​1:4-1:16;

[0015] a metallic lithium anode; and

[0016] positive electrode.

[0017] In the all-solid-state metal lithium battery of the present invention, the metal lithium negative electrode can be a metal lithium foil, a lithium sheet, a lithium alloy, etc.

[0018] In the all-solid-state metal lithium battery of the present invention, the positive electrode is a composite of a positive electrode active material, a binder and a conductive agent coated on a current collector. The current collector is a common current collector in the art, such as aluminum foil, carbon-coated aluminum foil, etc. The positive electrode active material can be selected from at least one of lithium iron phosphate, lithium cobalt oxide, nickel-cobalt-manganese ternary materials, lithium-rich manganese-based positive electrode materials, sulfur-carbon composites, sulfurized polyacrylonitrile, metal sulfides, etc. conventionally used in all-solid-state metal lithium batteries. The binder can be selected from at least one of polyvinylidene fluoride, polyamide, polyvinyl alcohol, etc. The conductive agent can be selected from at least one of carbon black, superP Li, Ketjen black, etc. Generally speaking, in the composite of the positive electrode active material, the binder and the conductive agent, the mass ratio of the positive electrode active material, the binder and the conductive agent is 8:1:1. The present invention specifically recommends that the positive electrode is prepared by the following steps:

[0019] (1) taking a positive electrode active material, a binder and a conductive agent, mixing and grinding them in proportion, and mixing them evenly in N-methylpyrrolidone (NMP) to obtain a prepared slurry;

[0020] (2) The slurry is evenly coated on the current collector, vacuum dried at 100-120°C for 10-12h, cut into electrodes of suitable shapes, and placed in a glove box for later use.

[0021] The present invention uses TFPBA and SN as soluble additives for solid electrolytes of all-solid-state metal lithium batteries. On the one hand, the TFPBA additive can generate a stable and dense solid electrolyte interface in situ on the surface of the metal lithium negative electrode, and its main components are lithium fluoride and lithium borate. The electrolyte after using the TFPBA additive can evenly distribute metal ion flux during the battery charging and discharging process, and inhibit the growth of dendrites. On the other hand, the SN additive can act on the positive electrode to form a CEI layer on the electrolyte / positive electrode surface. The passivation film on the positive electrode surface can effectively inhibit the dissolution of transition metal ions and improve the structural stability of the positive electrode material. For the electrolyte itself, the addition of TFPBA, which contains strong polar fluorine atoms in its structure, can inhibit the interaction between polymer matrices such as PEO segments and lithium ions to a certain extent, thereby increasing the lithium ion migration number of the solid electrolyte, and the addition of SN can remove trace moisture, and appropriate SN can widen the electrolyte oxidation potential window and inhibit the oxidative decomposition of the electrolyte, thereby obtaining an all-solid-state metal lithium battery with better cycle performance.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) In the present invention, both TFPBA and SN can be completely dissolved in the polymer electrolyte. The polar fluorine atoms and boron atoms in the additive TFPBA can interact with lithium ions, promote the migration of lithium ions on the polymer chain segments, and construct a continuous lithium ion migration channel in the polymer matrix, thereby achieving an improvement in the ionic conductivity of the polymer solid electrolyte.

[0024] (2) The present invention uses TFPBA as a solid electrolyte additive to achieve simultaneous protection of the negative electrode and the positive electrode of the all-solid-state metal lithium battery. On the one hand, TFPBA promotes the formation of a uniform and stable SEI film protective layer on the metal negative electrode before cycling, covers the metal surface with a uniform and dense protective layer, greatly reduces the reaction activity of the metal electrode, and effectively avoids side reactions between the polymer matrix and the metal negative electrode. On the other hand, TFPBA generates a CEI layer containing borate at the electrolyte / positive electrode interface, inhibits direct contact between the positive electrode and the electrolyte, thereby reducing electrolyte oxidation and achieving stable long-term cycling of the all-solid-state metal lithium battery.

[0025] (3) SN in the additive of the present invention has a high dielectric constant (~55), a low highest occupied molecular orbital (HOMO energy level), can dissolve a variety of lithium salts, and can reduce the overall HOMO energy level of the electrolyte, thereby widening the electrochemical oxidation potential window of the electrolyte. In addition, the addition of SN can avoid the segregation of transition metal elements in high-voltage positive electrode materials and form a CEI layer at the electrolyte / positive electrode interface.

[0026] (4) In summary, the present invention adopts TFPBA and SN as soluble additives for polymer solid electrolytes, and the prepared polymer solid electrolytes are uniform. Moreover, through the synergistic effect of the two, the ionic conductivity of the polymer solid electrolyte can be improved, the protection of the negative electrode of the all-solid-state metal lithium battery and the expansion of the electrochemical oxidation window can be achieved, thereby achieving a significant improvement in the cycle performance of the all-solid-state metal lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the EIS diagram of the blocked electrode of the polymer solid electrolyte in Example 1 of the present invention.

[0028] Figure 2 This is a graph of the ion migration of the polymer solid electrolyte in Example 1 of the present invention.

[0029] Figure 3 This is the electrochemical window diagram of the polymer solid electrolyte in Example 1 of the present invention.

[0030] Figure 4 This is a long cycle performance diagram of the all-solid-state lithium metal battery in Example 1 of the present invention.

[0031] Figure 5 This is the EIS diagram of the blocked electrode of the polymer solid electrolyte in Comparative Example 1 of the present invention.

[0032] Figure 6 This is a graph of the ion migration of the polymer solid electrolyte in Comparative Example 1 of the present invention.

[0033] Figure 7 This is the electrochemical window diagram of the polymer solid electrolyte in Comparative Example 1 of the present invention.

[0034] Figure 8 This is a long cycle performance diagram of the all-solid-state battery in Comparative Example 1 of the present invention.

[0035] Fig. 9 1 is the XRD diagram of the polymer solid electrolyte in Comparative Example 1 and Example 1 of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme will be further described clearly and completely by examples below. If no specific conditions are specified in the examples, the conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0037] Examples 1-4

[0038] 1. Preparation of a PEO-based solid electrolyte containing soluble additives:

[0039] 15 mL of anhydrous acetonitrile solution was used as an organic solvent, 0.6 g of PEO (Mv≈600,000) and 0.2175 g of metal salt LiTFSI (Mv=287.09) were added, the molar ratio of PEO to metal salt was 18:1, 10%, 1%, 5%, and 15% of TFPBA (see Table 1) of the total mass of PEO and metal salt were added, SN (molar ratio SN:PEO=1:8) was added, and stirred at room temperature for 24 h; then poured into a 40 mm×150 mm polytetrafluoroethylene mold, allowed to stand at room temperature for 24 h, and the solvent was naturally evaporated; finally, vacuum dried at 60°C for 24 h, and cut into a 19 mm circular electrolyte membrane, to obtain a PEO-based polymer solid electrolyte containing a soluble additive.

[0040] 2. A method for preparing a positive electrode sheet is as follows:

[0041] (1) 0.24 g of lithium iron phosphate, 0.03 g of polyvinylidene fluoride and 0.03 g of carbon black were mixed and ground in a ratio of 8:1:1, and mixed evenly in 0.75 mL of N-methylpyrrolidone (NMP) to obtain a prepared slurry;

[0042] (2) 0.4 mL of the slurry was evenly coated on a 80 mm × 100 mm carbon-coated aluminum foil, and after vacuum drying at 120 °C for 12 h, it was cut into positive electrode sheets with a diameter of 12 mm and placed in a glove box for use.

[0043] 3. Assemble the above-mentioned positive electrode sheet, metal lithium sheet and the above-mentioned solid electrolyte into an all-solid-state metal lithium battery in a glove box filled with argon (O2, H2O content are both <0.1ppm).

[0044] Comparative Example 1

[0045] 1. As shown in Table 1, with reference to Example 1, a PEO solid electrolyte prepared without adding a soluble additive, that is, a PEO solid electrolyte containing PEO and a lithium salt is used as Comparative Example 1. The specific operation is as follows: in a glove box filled with argon, anhydrous acetonitrile is used as a solvent, 0.2175g of bistrifluoromethanesulfonyl imide lithium salt (LiTFSI) and 0.6g of polyethylene oxide (PEO) with a molar ratio of 1:18 are dissolved in 15mL of anhydrous acetonitrile solvent, and then poured into a 40mm×150mm polytetrafluoroethylene mold, and the solvent is naturally volatilized after standing for 24h, and vacuum dried at 60°C for 24h, and cut into a 19mm circular electrolyte membrane. That is, a PEO-based solid electrolyte without additives is obtained.

[0046] 2. The preparation method of the positive electrode sheet is the same as that of Example 1.

[0047] 3. Assemble the positive electrode sheet, the metal lithium sheet and the above-mentioned solid electrolyte without additives into an all-solid-state lithium metal battery in a glove box filled with argon (O2, H2O content are both <0.1ppm).

[0048] Comparative Example 2

[0049] 1. Referring to Example 1, the only difference is that SN is not added, and a PEO-based solid electrolyte containing the additive TFPBA is obtained.

[0050] 2. The preparation method of the positive electrode sheet is the same as that of Example 1.

[0051] 3. Assemble the positive electrode sheet, the metal lithium sheet and the above-mentioned solid electrolyte without additives into an all-solid-state lithium metal battery in a glove box filled with argon (O2, H2O content are both <0.1ppm).

[0052] Comparative Example 3

[0053] 1. Referring to Example 1, the only difference is that TFPBA is not added to obtain a PEO-based solid electrolyte containing the additive SN.

[0054] 2. The preparation method of the positive electrode sheet is the same as that of Example 1.

[0055] 3. Assemble the positive electrode sheet, the metal lithium sheet and the above-mentioned solid electrolyte without additives into an all-solid-state lithium metal battery in a glove box filled with argon (O2, H2O content are both <0.1ppm).

[0056] Embodiment 5-6

[0057] 1. The preparation of PEO-based solid electrolyte containing soluble additives is the same as in Example 1.

[0058] 2. As shown in Table 2, referring to Example 1, only the positive electrode active material was changed to prepare a positive electrode sheet.

[0059] 3. Assemble an all-solid-state metal lithium battery in the manner of Example 1.

[0060] Example 7

[0061] The batteries prepared in Examples 1-6 and Comparative Examples 1-3 were placed in a constant temperature and humidity chamber at 60°C for 12 hours, and then subjected to a charge and discharge cycle test on a blue electric test charge and discharge tester. The test conditions were 30°C constant current 0.2C (0.1C = 170 mAh g -1 ) for 200 cycles. The results are shown in Tables 1 and 2.

[0062] Table 1 Specific composition and cycle performance of batteries of Examples 1-4 and Comparative Examples 1-3

[0063]

[0064]

[0065] Table 2 Specific composition and cycle performance of batteries in Examples 5-6

[0066]

[0067] Comparative analysis of Examples 1-4 and Comparative Examples 1-3 shows that in the all-solid-state metal lithium battery of Comparative Example 1, after 200 cycles, there is only a low discharge specific capacity, which can be attributed to the side reaction of the polymer solid electrolyte PEO with the lithium metal negative electrode during the test, producing Li2O, C2H4 and H2, accompanied by the growth of lithium dendrites, causing the battery to short-circuit. The specific capacity of the 200th cycle in the all-solid-state metal lithium battery of Example 1 is much higher than that of Comparative Example 1, and the discharge specific capacity still maintains a high value. In Comparative Examples 2 and 3, the cycle performance of the full battery assembled by adding TFPBA and SN electrolytes respectively is better than that of Comparative Example 1, but not as good as the full battery performance and discharge capacity of Example 1, which shows that after using TFPBA and SN additives, the full battery has better cycle performance.

[0068] By comparing and analyzing Example 1 and Examples 5-6, when all-solid-state lithium metal batteries were assembled using different positive electrode active materials for testing, it can be found that there is basically no significant difference between the first-week discharge capacity and the 200th-week discharge capacity of the three examples, indicating that the TFPBA and SN additives of the present invention are suitable for different positive electrode active materials.

[0069] Figure 1 and Figure 5 The electrochemical impedance spectra of the polymer electrolytes prepared in Example 1 and Comparative Example 1 at different temperatures are shown in Figure 1. It is calculated that the ionic conductivity of Comparative Example 1 is 1.24×10 -5 S cm -1 , while the ionic conductivity of the polymer electrolyte added with TFPBA and SN in Example 1 can reach 6.42×10 -5 S cm -1 . Figure 2 and Figure 6 The ion migration number diagram of the polymer electrolyte prepared in Example 1 of the present invention and Comparative Example 1 shows that the ion migration number of the PEO-based electrolyte without additives prepared in Comparative Example 1 is only 0.134, while after adding TFPBA and SN additives in Example 1, the ion migration number is significantly increased to 0.449, indicating that TFPBA and SN contain a large number of strong polar groups (fluorine atoms and cyano groups), which can weaken the interaction between PEO and Li + The interaction force between them increases the migration of free lithium ions. Figure 3 and Figure 7The electrochemical window diagrams of the polymer electrolytes prepared in Example 1 and Comparative Example 1 of the present invention show that the PEO-based polymer electrolyte of Comparative Example 1 undergoes oxidation at approximately 4.6V, while the oxidation potential window of the PEO-based polymer electrolyte containing TFPBA and SN additives of Example 1 is significantly increased to 5.0V. Figure 4 and Figure 8 The long cycle diagram of the Li / / LFP full battery of the polymer electrolyte prepared in Example 1 of the present invention and Comparative Example 1, the test conditions are 30°C, 0.2C. It can be seen from the figure that after adding TFPBA and SN in Example 1, the cycle stability of the full battery is significantly improved. Fig. 9 The XRD diagrams of the polymer electrolytes prepared in Example 1 and Comparative Example 1 show that 19° and 23° are the main diffraction peaks of the PEO material. After adding TFPBA and SN additives, the peak intensity weakens, which proves that the additives reduce the crystallinity of the PEO-based polymer, thereby improving the movement of the PEO-based chain segments and ultimately achieving an improvement in ionic conductivity.

[0070] This embodiment uses TFPBA and SN as soluble additives for solid electrolytes, which can protect the negative electrode of the all-solid-state metal lithium battery and widen the electrochemical oxidation window, thereby greatly improving the cycle performance of the all-solid-state metal lithium battery. Based on the existing common solid electrolytes, this method uses TFPBA and SN materials as soluble additives for solid electrolytes, which can greatly reduce the reaction activity of the metal negative electrode, and also effectively widen the electrochemical oxidation window of the PEO-based solid electrolyte, thereby obtaining an all-solid-state metal lithium battery with excellent cycle performance and long-term stability, so that the PEO-based polymer solid electrolyte matches the high-voltage positive electrode material. And the additive has a low cost and is easy and quick to operate.

[0071] The above content is a specific description of the content of the present invention in combination with a preferred embodiment, but it cannot be determined that the specific implementation of the present invention is limited to the embodiment. For those skilled in the art who understand the field to which the present invention belongs, several evolutions and substitutions can be made without departing from the research ideas of the present invention, and these deductions and substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A polymer solid electrolyte containing a soluble additive, characterized in that: The polymer solid electrolyte comprises a polymer matrix, a metal lithium salt and a soluble additive, wherein the soluble additive is 4-(trifluoromethyl)phenylboric acid and succinonitrile, wherein the mass of 4-(trifluoromethyl)phenylboric acid is 1-10% of the total mass of the polymer matrix and the metal lithium salt, when the polymer matrix is ​​a homopolymer, the molecular weight of the polymer matrix is ​​calculated based on the molecular weight of the monomer contained therein, and the molar ratio of succinonitrile to the polymer matrix is ​​1:4-1:16; when the polymer matrix is ​​a copolymer, the mass ratio of succinonitrile to the polymer matrix is ​​1:2-1:

6.

2. The polymer solid electrolyte containing a soluble additive as claimed in claim 1, characterized in that: The metal lithium salt is one or more of lithium perchlorate, lithium hexafluorophosphate, and lithium bis(trifluoromethanesulfonyl)imide, and the polymer matrix is ​​selected from polyethylene oxide, poly(vinylidene fluoride-co-hexafluoropropylene), polyacrylonitrile or polymethyl methacrylate.

3. The polymer solid electrolyte containing a soluble additive as claimed in claim 2, characterized in that: The polymer solid electrolyte containing soluble additives consists of a polymer matrix, a metal lithium salt and a soluble additive.

4. The polymer solid electrolyte containing a soluble additive according to any one of claims 1 to 3, characterized in that: The mass of 4-(trifluoromethyl)phenylboronic acid is 5-10% of the total mass of the polymer matrix and the metal lithium salt.

5. The polymer solid electrolyte containing a soluble additive as claimed in claim 4, characterized in that: The mass of 4-(trifluoromethyl)phenylboronic acid is 10% of the total mass of the polymer matrix and the metal lithium salt.

6. The polymer solid electrolyte containing a soluble additive according to any one of claims 1 to 3, characterized in that: When the polymer is a homopolymer, the molar ratio of succinonitrile to the polymer matrix is ​​1:

8.

7. An all-solid-state metal lithium battery, comprising: A polymer solid electrolyte containing a soluble additive as claimed in any one of claims 1 to 3; Metal lithium anode; and positive electrode.

8. The all-solid-state metal lithium battery according to claim 7, characterized in that: In the all-solid-state metal lithium battery, the metal lithium negative electrode is a metal lithium foil, a lithium sheet or a lithium alloy.

9. The all-solid-state lithium metal battery according to claim 7, characterized in that: In the all-solid-state metal lithium battery, the positive electrode is a composite of a positive electrode active material, a binder and a conductive agent coated on a current collector.

10. The all-solid-state lithium metal battery according to claim 9, characterized in that: The current collector is aluminum foil or carbon-coated aluminum foil; the positive electrode active material is selected from at least one of lithium iron phosphate, lithium cobalt oxide, nickel-cobalt-manganese ternary material, lithium-rich manganese-based positive electrode material, sulfur-carbon composite, sulfided polyacrylonitrile, and metal sulfide; the binder is selected from at least one of polyvinylidene fluoride, polyamide, and polyvinyl alcohol; the conductive agent is selected from at least one of carbon black, super P Li, and Ketjen black.

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