Solid-state lithium battery and preparation method thereof
By introducing an interface layer into solid-state lithium batteries and utilizing functional components formed from lithium metal, aromatic hydrocarbons, and ether solvents, the problems of lithium dendrite growth and pore formation are solved, enabling long-cycle and high-rate stable operation of solid-state lithium batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-03-24
AI Technical Summary
Solid-state lithium batteries suffer from porosity issues during cycling due to lithium dendrite growth and uneven lithium dissolution, which affect the battery's cycle performance and safety.
An interface layer is introduced into solid-state lithium batteries. The interface layer consists of a porous carrier and functional components impregnated thereon, including lithium metal, aromatic hydrocarbons and ether solvents. It forms an ion-electron network, has fluid properties, uniformly deposits lithium and releases stress, adapts to volume changes, and maintains interfacial contact.
Uniform lithium deposition and stripping were achieved, dendrite growth was suppressed, low interfacial impedance was maintained, and the cycle stability and energy density of the battery were improved.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lithium batteries, and particularly relates to a solid-state lithium battery and a preparation method thereof. BACKGROUND
[0002] The solid-state lithium battery using a solid-state electrolyte overcomes the limitations of traditional lithium-ion batteries, improves the energy density of the battery, and at the same time, the non-flammability and chemical / electrochemical stability of the solid-state electrolyte greatly improve the safety of the battery, so that the solid-state lithium battery can meet the demand of energy storage equipment for high energy density and high safety.
[0003] However, there is a lithium deposition interface layer on the surface of the solid-state electrolyte, and in the cycle process of the solid-state lithium battery, the local stress of lithium deposition between the traditional interface layer and the solid-state electrolyte causes the problem of dendrite growth of the solid-state lithium battery, and the problems of non-uniform dissolution of the lithium layer in the discharge process and the limited lithium storage capacity of the solid-state lithium battery further limit the cycle performance of the solid-state lithium battery. SUMMARY
[0004] In view of this, the present application provides a solid-state lithium battery and a preparation method thereof, which can solve at least one of the above technical problems.
[0005] In a first aspect, the present application provides a solid-state lithium battery, comprising a solid-state electrolyte and a positive electrode sheet, the solid-state lithium battery further comprising an interface layer, the interface layer being located on a side of the solid-state electrolyte away from the positive electrode sheet, the interface layer comprising a porous carrier and a functional component infiltrated in the porous carrier, the functional component comprising lithium metal, an aromatic hydrocarbon and an ether solvent.
[0006] The present application provides a solid-state lithium battery, which comprises a uniform interface layer, and the lithium metal and the aromatic hydrocarbon in the interface layer can form an ion-electron network, which is helpful to uniform electric field in the cycle process and realizes uniform lithium deposition, and the interface layer has fluid characteristics, which can release lithium deposition stress in the lithium deposition process, change the direction of lithium injection, and is helpful to solve the problem of lithium dendrite penetration; at the same time, the fluid characteristics of the interface layer adapt to the volume change of the solid-state lithium battery in the lithium stripping process, which is helpful to solve the problem of pore formation, so that the interface layer and the solid-state electrolyte always maintain complete interface contact and maintain low interface impedance, and thus it is helpful to realize long cycle and high rate stable operation of the solid-state lithium battery.
[0007] Based on the first aspect, in some embodiments, the aromatic hydrocarbon comprises at least one of biphenyl and naphthalene. Using the above-mentioned kind of aromatic hydrocarbon is helpful to improve the electronic conductivity of the functional component.
[0008] In some embodiments based on the first aspect, the ether solvent comprises at least one of tetrahydrofuran and ethylene glycol dimethyl ether. The use of the above-mentioned ether solvent facilitates the complete dissolution of lithium metal and aromatic hydrocarbons, and a uniform functional component is obtained.
[0009] In some embodiments based on the first aspect, the porous carrier comprises at least one of a glass fiber separator, a polyvinylidene fluoride separator, a polytetrafluoroethylene separator, a polypropylene separator, and a polyethylene separator. The porous carrier is a porous membrane structure, which can effectively adsorb the functional component and facilitate the formation of an interface layer with fluid properties.
[0010] In some embodiments based on the first aspect, the solid-state electrolyte comprises at least one of a lithium lanthanum zirconium oxide electrolyte, a tantalum-doped lithium lanthanum zirconium oxide electrolyte, a lithium lanthanum titanium oxide electrolyte, a lithium aluminum titanium phosphate electrolyte, a lithium aluminum germanium phosphate electrolyte, a lithium tin phosphorus sulfur electrolyte, and a polyethylene oxide-coated lithium germanium phosphorus sulfur. The above-mentioned solid-state electrolyte facilitates the formation of a stable and dense solid-state electrolyte film with the functional component.
[0011] In some embodiments based on the first aspect, the positive electrode tab comprises a positive electrode current collector and a positive electrode material layer disposed on at least one surface of the positive electrode current collector, and the positive electrode material layer comprises at least one of lithium iron phosphate, lithium cobaltate, and lithium-rich manganese-based. The type of active material in the positive electrode material layer can be selected, and the functional component has good compatibility with the positive electrode material.
[0012] In some embodiments based on the first aspect, the solid-state lithium battery further comprises a lithium metal foil. The solid-state lithium battery containing the lithium metal foil can supplement the irreversible active lithium consumption during the cycle process, so that the solid-state lithium battery has good cycle life and capacity retention rate.
[0013] The second aspect provides a preparation method of the solid-state lithium battery according to any one of the first aspect, comprising the following steps: mixing lithium metal, aromatic hydrocarbons and ether solvent to obtain a functional component; sequentially stacking a porous carrier, a solid-state electrolyte and a positive electrode tab; and applying the functional component to the porous carrier to obtain the solid-state lithium battery.
[0014] In some embodiments based on the second aspect, the concentration of lithium metal is 0.5 mol / L-1.5 mol / L based on the volume of the functional component. The concentration of lithium metal in the above-mentioned range facilitates the improvement of the ionic conductivity of the functional component.
[0015] In some embodiments based on the second aspect, the concentration of aromatic hydrocarbons is 0.5 mol / L-1.5 mol / L based on the volume of the functional component. The concentration of aromatic hydrocarbons in the above-mentioned range facilitates the improvement of the electronic conductivity of the functional component. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The critical current density test graph of Example 1 of the present application.
[0017] Figure 2 The average coulombic efficiency and specific capacity change graph of Example 1 and Comparative Example 3 of the present application cycled at a charge-discharge rate of 2C.
[0018] Figure 3 The capacity density-voltage curve of Example 2 of the present application cycled at a charge-discharge rate of 2C.
[0019] Figure 4 The specific capacity change graph of Example 3 of the present application cycled at a charge-discharge rate of 2C.
[0020] Figure 5 The specific capacity change graph of Example 4 of the present application cycled at a charge-discharge rate of 0.5C and 2C.
[0021] Figure 6 The critical current density test graph of Comparative Example 1 and Comparative Example 2 of the present application. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.
[0023] In the existing solid-state lithium battery, if there are problems of electron leakage and current concentration during the cycle process, lithium ions preferentially deposit at the interface defects, and the stacking pressure during lithium growth will cause local stress at the interface defects, thereby promoting the stick-plastic flow of lithium into the crack, and then pushing the crack to continuously expand within the solid-state electrolyte; during the lithium peeling process, the lithium at the solid-solid interface contact point will preferentially react and peel off, but due to the lack of flowability of the solid-state electrolyte, it cannot be backfilled and maintain the close contact between the interfaces in time, resulting in vacancies left inside the lithium deposition layer, which will converge and grow during the continuous charge and discharge process, and finally form micro-pores, thereby destroying the physical contact of the interface. To this end, the present application provides a solid-state lithium battery and a preparation method thereof, which can solve the above problems through an interface layer containing a functional component.
[0024] The solid-state lithium battery includes a cell and a housing encapsulating the cell, the cell is composed of an interface layer, a solid-state electrolyte and a positive electrode sheet, the solid-state electrolyte is arranged between the interface layer and the positive electrode sheet, in some embodiments, the solid-state lithium battery composed of the above is a negative electrode-free structure, using the interface layer as a lithium deposition interface directly, which is beneficial to improve the energy density of the solid-state lithium battery. In some embodiments, the solid-state lithium battery further includes a lithium metal foil, the interface layer is formed between the lithium metal foil and the solid-state electrolyte, compared with the negative electrode-free structure, the solid-state lithium battery containing the lithium metal foil can supplement the irreversible active lithium consumption in the cycle process, so that the solid-state lithium battery has good cycle life and capacity retention rate.
[0025] The interface layer includes a porous carrier and a functional component infiltrated in the porous carrier, the functional component includes lithium metal, aromatic hydrocarbon and ether solvent, in some embodiments, the aromatic hydrocarbon includes at least one of biphenyl and naphthalene, using the above-mentioned kind of aromatic hydrocarbon is beneficial to improve the electronic conductivity of the functional component. In some embodiments, the ether solvent includes at least one of tetrahydrofuran and ethylene glycol dimethyl ether. Using the above-mentioned kind of ether solvent is beneficial to completely dissolve the lithium metal and the aromatic hydrocarbon to obtain a uniform functional component.
[0026] In some embodiments, the porous carrier includes at least one of glass fiber separator, polyvinylidene fluoride separator, polytetrafluoroethylene separator, polypropylene separator and polyethylene separator. The above-mentioned porous carrier is a porous membrane structure, which can effectively adsorb the functional component, and is beneficial to form an interface layer with fluid properties.
[0027] In some embodiments, the solid-state electrolyte can selectively conduct lithium ions and block electrons between the positive and negative electrodes, the solid-state electrolyte includes at least one of lithium lanthanum zirconium oxide electrolyte, tantalum-doped lithium lanthanum zirconium oxide electrolyte, lithium lanthanum titanium oxide electrolyte, lithium aluminum titanium phosphate electrolyte, lithium aluminum germanium phosphate electrolyte, lithium tin phosphorus sulfur electrolyte and polyethylene oxide coated lithium germanium phosphorus sulfur. The above-mentioned solid-state electrolyte is beneficial to form a stable and dense solid-state electrolyte film with the functional component.
[0028] The positive electrode sheet includes a positive electrode current collector and a positive electrode material layer arranged on at least one surface of the positive electrode current collector, the positive electrode material layer includes at least one of lithium iron phosphate, lithium cobaltate and lithium-rich manganese-based. The type of active material in the positive electrode material layer can be selected, and the functional component has good positive electrode material compatibility.
[0029] The application provides a solid-state lithium battery, which comprises a uniform interface layer, lithium metal and an aromatic hydrocarbon in the interface layer can form an ion-electron network, which is helpful for uniform electric field during cycling, realizes uniform lithium deposition, and the interface layer has fluid characteristics, which can release lithium deposition stress during lithium deposition, change lithium injection direction, and is helpful for solving the problem of lithium dendrite penetration; at the same time, the fluid characteristics of the interface layer adapt to the volume change of the solid-state lithium battery during lithium stripping, which is helpful for solving the problem of pore formation, so that the interface layer and the solid-state electrolyte always maintain complete interface contact and maintain low interface impedance, and then it is helpful for realizing long cycle and high rate stable operation of the solid-state lithium battery.
[0030] The application also provides a preparation method of a solid-state lithium battery, which comprises the following steps: Step one, mixing lithium metal, an aromatic hydrocarbon and an ether solvent to obtain a functional component; Step two, stacking a porous carrier, a solid-state electrolyte and a positive electrode sheet in sequence; and applying the functional component to the porous carrier to obtain the solid-state lithium battery.
[0031] In some embodiments, the concentration of lithium metal is 0.5 mol / L-1.5 mol / L based on the volume of the functional component, and the concentration of lithium metal can be 0.5 mol / L, 0.7 mol / L, 0.9 mol / L, 1.1 mol / L, 1.3 mol / L and 1.5 mol / L, etc., or a range formed by any two of the above values. The concentration of lithium metal in the above range is helpful for improving the ionic conductivity of the functional component.
[0032] Based on the first aspect, in some embodiments, the concentration of the aromatic hydrocarbon is 0.5 mol / L-1.5 mol / L based on the volume of the functional component, and the concentration of the aromatic hydrocarbon can be 0.5 mol / L, 0.7 mol / L, 0.9 mol / L, 1.1 mol / L, 1.3 mol / L and 1.5 mol / L, etc., or a range formed by any two of the above values. The concentration of the aromatic hydrocarbon in the above range is helpful for improving the electronic conductivity of the functional component.
[0033] The technical solutions of the application are exemplified below in combination with specific embodiments.
[0034] Embodiment 1 (1) Mix lithium metal, biphenyl and tetrahydrofuran solvent, until the lithium metal and biphenyl are completely dissolved, to obtain a uniform functional component, wherein the concentration of lithium metal and biphenyl is 1 mol / L.
[0035] (2) The glass fiber separator, lithium lanthanum zirconium oxide electrolyte, positive electrode coated with lithium iron phosphate active material and packaging material are stacked in sequence in an inert atmosphere in a glove box. The functional components in step (1) are dropped onto the glass fiber separator and assembled into a button cell (a negative electrode-free solid lithium battery).
[0036] (3) After the button cell battery is assembled, a charge-discharge cycle test is performed.
[0037] Example 2 (1) Mix lithium metal, biphenyl and tetrahydrofuran solvent until lithium metal and biphenyl are completely dissolved to obtain a homogeneous functional component, wherein the concentration of lithium metal and biphenyl is 1 mol / L.
[0038] (2) The glass fiber separator, lithium lanthanum zirconium oxide electrolyte, positive electrode coated with lithium cobalt oxide (LiCoO2) and packaging materials are stacked in sequence in an inert atmosphere in a glove box. The functional components in step (1) are dropped onto the glass fiber separator and assembled into a button cell (a negative electrode-free solid lithium battery).
[0039] (3) After the button cell battery is assembled, a charge-discharge cycle test is performed.
[0040] Example 3 (1) Mix lithium metal, biphenyl and tetrahydrofuran solvent until lithium metal and biphenyl are completely dissolved to obtain a homogeneous functional component, wherein the concentration of lithium metal and biphenyl is 1 mol / L.
[0041] (2) A glass fiber diaphragm, a lithium lanthanum zirconium oxide electrolyte, and a lithium-rich manganese-based (LiMn) electrolyte are used. 0.6 Fe 0.4 The positive electrode sheet and packaging material of PO4 are stacked in sequence in an inert atmosphere in a glove box. The functional components in step (1) are dropped onto the glass fiber separator and assembled into a button cell (a negative electrode-free solid lithium battery).
[0042] (3) After the button cell battery is assembled, a charge-discharge cycle test is performed.
[0043] Example 4 (1) Mix lithium metal, biphenyl and tetrahydrofuran solvent until lithium metal and biphenyl are completely dissolved to obtain a homogeneous functional component, wherein the concentration of lithium metal and biphenyl is 1 mol / L.
[0044] (2) Stack the glass fiber diaphragm, lithium lanthanum zirconium oxide electrolyte, positive electrode coated with lithium iron phosphate active material and packaging material in sequence in an inert atmosphere in a glove box, and drop the functional components in step (1) onto the glass fiber diaphragm.
[0045] (3) After the functional components are added, lithium metal foil is stacked on top and assembled into a button cell (lithium metal solid lithium battery).
[0046] (4) After the button cell is assembled, a charge-discharge cycle test is performed.
[0047] Comparative Example 1 (1) Heat lithium metal to above its melting point and allow it to come into full contact with the lithium lanthanum zirconium oxide electrolyte interface through molten friction. Then let the sample stand until it cools down.
[0048] (2) The lithium lanthanum zirconium oxide electrolyte, the positive electrode coated with lithium iron phosphate active material and the packaging material from step (1) are stacked in sequence in an inert atmosphere in a glove box to assemble a button cell (lithium metal solid lithium battery).
[0049] (3) After the button cell is assembled, a charge-discharge cycle test is performed. The test results are as follows: Figure 6 .
[0050] Comparative Example 2 (1) The glass fiber diaphragm, lithium lanthanum zirconium oxide electrolyte, positive electrode coated with lithium iron phosphate active material, and packaging materials were stacked in sequence in an inert atmosphere in a glove box. The liquid electrolyte (lithium bis(trifluoromethanesulfonyl)imide as the main lithium salt, 1,3-dioxane (DOL) and dimethyl ethylene glycol (DME) as the organic solvent system, and lithium nitrate (LiNO3) as the functional additive; wherein the concentration of the main lithium salt in the electrolyte is 1 mol / L, the functional additive accounts for 2% of the total mass of the electrolyte, and the volume ratio of 1,3-dioxane-dimethyl ethylene glycol (DOL-DME) is 1:1) was dropped onto the glass fiber diaphragm.
[0051] (2) After adding liquid electrolyte, stack lithium metal foil and assemble it into a button cell (lithium metal solid lithium battery).
[0052] (3) After the button cell is assembled, a charge-discharge cycle test is performed. The test results are as follows: Figure 6 .
[0053] Comparative Example 3 (1) The polyethylene diaphragm, the positive electrode coated with lithium iron phosphate active material, and the packaging material are stacked in sequence in an inert atmosphere in a glove box. The liquid electrolyte (lithium bis(trifluoromethanesulfonyl)imide as the main lithium salt, 1,3-dioxane (DOL) and dimethyl ethylene glycol (DME) as the organic solvent system, and lithium nitrate (LiNO3) as the functional additive; wherein the concentration of the main lithium salt in the electrolyte is 1 mol / L, the functional additive accounts for 2% of the total mass of the electrolyte, and the volume ratio of 1,3-dioxane-dimethyl ethylene glycol (DOL-DME) is 1:1) is dropped onto the polyethylene diaphragm.
[0054] (2) After adding liquid electrolyte, copper foil is stacked on top and assembled into a button cell (liquid electrolyte-based negative electrode cell).
[0055] (3) After the button cell is assembled, a charge-discharge cycle test is performed.
[0056] Table 1 Test Result Analysis: Please refer to Figure 1 In Example 1, a lithium biphenyl-tetrahydrofuran solution with a lithium metal and biphenyl concentration of 1 mol / L was used as the functional component, at 35 mA / cm². 2 The current density and 0.58 mAh / cm 2 Even with the same capacity, the battery can still stably deposit lithium without dendrite growth causing short circuits.
[0057] refer to Figure 2 In Example 1, a lithium biphenyl-tetrahydrofuran solution with a lithium metal and biphenyl concentration of 1 mol / L was used as the functional component. A negative electrode-free solid lithium battery was constructed by matching a trace amount (4 μL) of lithium biphenyl-tetrahydrofuran interface layer with a lithium iron phosphate cathode. The battery could be stably cycled for 300 cycles at 2C with a capacity retention rate of 87.5%, meaning that there was no capacity loss due to dendrite growth and increased interface impedance at a higher current density.
[0058] refer to Figure 3 and Figure 4 In Examples 2 and 3, lithium biphenyl-tetrahydrofuran solutions with a lithium metal and biphenyl concentration of 1 mol / L were used as functional components, and trace amounts (4 μL) of lithium biphenyl-tetrahydrofuran interface layers were used to match lithium cobalt oxide (LiCoO2) and lithium-rich manganese (LiMn) compounds, respectively. 0.6 Fe 0.4 The solid-state lithium battery without a negative electrode (PO4) positive electrode can release a specific capacity of 135 mAh / g in Example 2 and 149.4 mAh / g in Example 3 at 2C, which means that the functional components of this application have good compatibility with positive electrode materials.
[0059] refer to Figure 5 In Example 4, a 1 mol / L lithium biphenyl-tetrahydrofuran solution was used as the functional component. A lithium metal solid-state battery using a trace amount (4 μL) of lithium biphenyl-tetrahydrofuran interface layer matched with a lithium iron phosphate cathode could be stably cycled at 0.5C and 2C, releasing approximately 160 mAh g⁻¹, respectively. -1 and 140mAhg -1 The specific capacity, i.e., the functional components used in solid-state lithium batteries, can suppress lithium dendrite growth and interfacial physical contact loss, and are applicable to electrodeless solid-state lithium batteries and lithium metal-solid-state lithium batteries.
[0060] refer to Figure 6 In Comparative Example 1, without using interface layer modifications, at 0.4 mAcm -2 At current densities, lithium deposition can induce dendrite growth and lead to short circuits. There is no adaptive interface stress relief during lithium deposition, resulting in severe dendrite growth problems. Furthermore, the battery polarization increases significantly during the delithiation process, indicating an increase in interface impedance and loss of physical contact at the interface.
[0061] refer to Figure 6 In Comparative Example 2, when modified with a liquid electrolyte interface layer, at 0.3 mA / cm²... -2 At the specified current density, dendrite growth and micro-short circuits occur during lithium deposition. There is no adaptive interface stress relief during lithium deposition, leading to rapid dendrite growth. Furthermore, the overall battery polarization is high, indicating high interfacial impedance and impeded ion transport between the ion-conducting electrolyte and the lithium metal and solid electrolyte.
[0062] refer to Figure 2 In Comparative Example 3, when the liquid electrolyte interface layer was modified, the lithium metal deposited on the negative electrode current collector (lithium metal foil and copper foil) side continuously generated side reactions with the liquid electrolyte, resulting in low battery coulombic efficiency. Furthermore, the capacity retention rate of the liquid electrolyte-based negative electrode-free battery was only 13.4% after 100 cycles.
[0063] In summary, the different formulations of lithium aromatic hydrocarbon-ether solvents in the above embodiments result in different solvation structures, which have a certain impact on the lithium-ion desolvation process (lithium deposition process). Comparison shows that the lithium biphenyl-tetrahydrofuran system exhibits the fastest desolvation process, and the total conductivity of the interface layer is highest when the solute (lithium biphenyl) concentration is 1 mol / L, thus minimizing battery polarization. Furthermore, the batteries assembled in each embodiment can achieve a conductivity of 30 mA / cm². 2 At current densities below a certain threshold, no short circuit occurs during lithium deposition, the lithium deposition process is uniform, and dendrite growth is effectively suppressed. In contrast, the solid-state lithium batteries in the comparative proportions (without any interface layer and with electrolyte as an interface layer) exhibit <0.5 mA / cm² current density. 2 A short circuit will occur at a current density of [insert value here]. Furthermore, in addition to the battery structure of a cathodeless solid-state lithium battery, the solid-state lithium battery interface layer of this invention is also suitable as an interface layer between a lithium metal electrode and a solid electrolyte, and is applicable to cathode materials such as lithium iron phosphate, lithium cobalt oxide, and lithium-rich manganese-based cathodes, demonstrating high applicability of functional components.
[0064] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.
Claims
1. A solid-state lithium battery, comprising a solid electrolyte and a positive electrode, characterized in that, The solid-state lithium battery further includes an interface layer located on the side of the solid electrolyte away from the positive electrode. The interface layer includes a porous carrier and functional components impregnated in the porous carrier. The functional components include lithium metal, aromatic hydrocarbons, and ether solvents.
2. The solid-state lithium battery according to claim 1, characterized in that, The aromatic hydrocarbon includes at least one of biphenyl and naphthalene.
3. The solid-state lithium battery according to claim 1, characterized in that, The ether solvent includes at least one of tetrahydrofuran and ethylene glycol dimethyl ether.
4. The solid-state lithium battery according to claim 1, characterized in that, The porous carrier includes at least one of glass fiber membrane, polyvinylidene fluoride membrane, polytetrafluoroethylene membrane, polypropylene membrane, and polyethylene membrane.
5. The solid-state lithium battery according to claim 1, characterized in that, The solid electrolyte includes at least one of lithium lanthanum zirconium oxide electrolyte, tantalum-doped lithium lanthanum zirconium oxide electrolyte, lithium lanthanum titanium oxide electrolyte, lithium aluminum titanium phosphate electrolyte, lithium aluminum germanium phosphate electrolyte, lithium tin phosphorus sulfur electrolyte, and polyethylene oxide-coated lithium germanium phosphorus sulfur electrolyte.
6. The solid-state lithium battery according to claim 1, characterized in that, The positive electrode includes a positive current collector and a positive electrode material layer disposed on at least one surface of the positive current collector, wherein the positive electrode material layer includes at least one of lithium iron phosphate, lithium cobalt oxide, and lithium-rich manganese-based materials.
7. The solid-state lithium battery according to claim 1, characterized in that, The solid-state lithium battery also includes a lithium metal foil, which is located on the side of the interface layer opposite to the solid electrolyte.
8. A method for preparing a solid-state lithium battery as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Functional components are obtained by mixing lithium metal, aromatic hydrocarbons, and ether solvents; The porous support, solid electrolyte, and positive electrode are sequentially stacked; and The functional components are applied to the porous carrier to obtain the solid-state lithium battery.
9. The method for preparing a solid-state lithium battery according to claim 8, characterized in that, Based on the volume of the functional component, the concentration of the lithium metal is 0.5 mol / L to 1.5 mol / L.
10. The method for preparing a solid-state lithium battery according to claim 8, characterized in that, Based on the volume of the functional component, the concentration of the aromatic hydrocarbon is 0.5 mol / L to 1.5 mol / L.