Solid-state dual-electrode battery and preparation method thereof

Abstract

The invention relates to a solid-state dual-electrode battery and a preparation method thereof, and belongs to the technical field of solid-state batteries. The solid-state dual-electrode battery provided by the invention comprises a parallel unit and a series unit, the positive pole pieces in the parallel units are connected with the negative pole pieces through the solid electrolyte and are laminated to form n parallel units; the series unit comprises a positive electrode side and a negative electrode side which are connected in series, and the positive electrode side and the negative electrode side are respectively connected with the negative electrode piece and the positive electrode piece of the parallel unit through solid electrolyte; the m series units are alternately connected with the parallel units to obtain an integral structure; m > = 1, and n > = 1. The solid-state dual-electrode battery provided by the invention adopts a multiple parallel connection-multiple series connection structure, so that the solid-state dual-electrode battery gives consideration to both high voltage and high capacity, can also realize higher energy density by regulating and controlling the proper parallel connection structure and series connection unit number, and has application prospects in the fields of power automobiles, energy storage, aircrafts and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state batteries, and in particular to a solid-state dual-electrode battery and a preparation method thereof. Background Art

[0002] At present, solid-state batteries are often made into single cells with a voltage below 5V. Patent CN202210601289.7 reports that solid-state batteries are composed of n solid-state stacking units, which include a composite current collector, a positive electrode layer and a solid electrolyte layer. The solid-state stacking units are stacked with each other to achieve internal series connection, with 1-200 layers in series. The cells need to be connected in series and parallel through Pack to increase the voltage and capacity of the module, resulting in a reduction in the energy density of the battery pack.

[0003] Patent CN202111582017 discloses a battery cell, comprising a plurality of basic units connected in series: a composite negative electrode current collector, a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector stacked in sequence, so that the energy density of the battery can be higher and the structure is simplified.

[0004] The series / parallel structure of solid-state battery cells in the prior art can only achieve high voltage or high capacity, but it is difficult to achieve both high capacity and high voltage at the same time. Therefore, developing a solid-state dual-electrode battery structure that can achieve high voltage, high capacity and high energy density at the same time and has good stability is of great significance to the research and development and performance improvement of solid-state batteries. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a solid-state dual-electrode battery and a preparation method thereof. The solid-state dual-electrode battery provided by the present invention adopts a specific parallel and series combination structure, which can provide high capacity and energy density while taking into account high voltage.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In the first aspect, the present invention provides a solid-state dual-electrode battery, comprising a parallel unit and a series unit; in the parallel unit, the positive electrode plate is connected to the negative electrode plate through a solid electrolyte, and the plates are stacked to form n parallel units; the series unit comprises a positive electrode side and a negative electrode side connected in series, and the positive electrode side and the negative electrode side are respectively connected to the negative electrode plate and the positive electrode plate of the parallel unit through a solid electrolyte; m series units are alternately connected to the parallel unit; m≥1, n≥1.

[0008] The main structure of the solid-state dual-electrode battery provided by the present invention includes parallel units and series units. In the parallel unit, n parallel units are formed according to a similar arrangement order of "positive electrode sheet-solid electrolyte-negative electrode sheet-solid electrolyte-positive electrode sheet" or "negative electrode sheet-solid electrolyte-positive electrode sheet-solid electrolyte-negative electrode sheet"; the parallel unit composed of multiple parallel structures can give the battery good capacity performance, and to a certain extent improve the energy density of the battery and enhance the energy storage performance.

[0009] The series unit consists of a positive electrode side and a negative electrode side directly connected in series, with solid electrolytes connected to both sides of the series unit, and then further connected to the negative electrode plates or positive electrode plates at both ends of the above-mentioned parallel unit to achieve the conversion between the series structure and the parallel structure; the above method is implemented as a combination of "parallel unit-1st series unit-parallel unit-2nd series unit-...-nth series unit-parallel unit connection", and m series units are alternately connected to m+1 parallel units. By introducing series units and connecting multiple parallel units, the voltage level of the battery can be significantly improved.

[0010] In the parallel unit, the number of parallel stacks (i.e. the number of "positive electrode sheet-solid electrolyte-negative electrode sheet" structures) is at least 1; the total number of series units in the solid-state dual-electrode battery is at least 1. At this time, the solid-state dual-electrode battery can take into account both high voltage > 5V and high capacity, and the energy density is above 300Wh / Kg and the cycle stability is high, which can meet the market demand for higher performance batteries.

[0011] Preferably, the series unit is composed of a positive electrode material layer, a composite tape and / or a negative electrode material layer connected in sequence, and the composite tape is a copper-aluminum composite tape or a lithium-copper-aluminum composite tape; the positive electrode material layer and the aluminum tape side of the composite tape constitute the positive electrode side; the lithium in the negative electrode material layer or the composite tape and the copper tape side of the composite tape constitute the negative electrode side. The present invention selects an aluminum composite tape or a lithium-copper-aluminum composite tape as the structural basis of the series unit, thereby further connecting the parallel units to obtain the above structure.

[0012] Preferably, the positive electrode plate comprises a positive electrode current collector and a positive electrode material layer distributed on at least one side of the positive electrode current collector, and the negative electrode plate comprises a negative electrode current collector and a negative electrode material layer distributed on at least one side of the negative electrode current collector.

[0013] In the parallel unit, the positive / negative electrode sheet at the end has the positive / negative electrode material layer distributed only on one side of the current collector; while the positive / negative electrode sheet at the center of the battery cell has the positive / negative electrode material layer distributed on both sides of the current collector to further connect the solid electrolyte, thereby realizing n-fold stacking of the above-mentioned parallel structure.

[0014] Further preferably, the positive electrode current collector is aluminum foil; and the negative electrode current collector is one of copper foil and lithium-copper composite foil.

[0015] The positive electrode collector in the positive electrode plate of the present invention can be made of aluminum foil, and the positive electrode material can be coated on both sides; when the negative electrode collector is copper, the negative electrode material can be coated on both sides; when the negative electrode collector is lithium-copper composite foil, lithium metal can also be directly used as the negative electrode material; and the series unit uses copper-aluminum composite foil or aluminum-copper-lithium composite foil, the aluminum side is coated with positive electrode material, the copper side is coated with negative electrode material or lithium is used as negative electrode material, which is beneficial to improve the energy density of solid-state batteries and increase battery capacity and voltage.

[0016] Further preferably, the positive electrode material layer comprises positive electrode material and ceramic material, and the ceramic material is distributed at the edge of the positive electrode material.

[0017] Further preferably, the negative electrode material of the negative electrode material layer is at least one of copper, lithium, silicon oxide, silicon carbon and graphite.

[0018] Preferably, the positive electrode material includes at least one of lithium cobalt oxide, lithium manganese oxide, nickel cobalt manganese, lithium iron phosphate, and lithium manganese iron phosphate; the ceramic material is at least one of alumina, LATP, LLZO, LLZTO, and boehmite.

[0019] Further preferably, the positive electrode material comprises the positive electrode active material listed above, as well as a binder and a conductive agent.

[0020] Preferably, the solid electrolyte is at least one of an oxide solid electrolyte, LLTO, LLZO, LATP, LLZTO, a sulfide solid electrolyte, and a halide solid electrolyte.

[0021] Preferably, 5≤n≤30, 2≤m≤13.

[0022] The overall thickness of a battery cell with too many layers is large, which can easily lead to difficulties in heat dissipation and assembly. Preferably, the number of layers in the parallel unit is 5-30 and the number of series units is 2-13.

[0023] In a second aspect, the present invention provides a method for preparing the above-mentioned solid-state dual-electrode battery, characterized in that it comprises the following steps:

[0024] (1) coating or transferring the solid electrolyte on both sides of the positive electrode sheet or the negative electrode sheet, and then stacking the sheets alternately n times to obtain a parallel unit;

[0025] (2) coating the negative electrode material on the copper foil side of the copper-aluminum composite strip and coating the positive electrode material and ceramic material on the aluminum foil side to obtain a series unit; or coating the positive electrode material and ceramic material on the aluminum foil side of the lithium-copper-aluminum composite strip to obtain a series unit;

[0026] (3) applying or transferring solid electrolytes on both sides of the series unit, alternately connecting the positive electrode sheets or negative electrode sheets of the parallel units, and connecting the parallel units through m series units;

[0027] (4) Welding the positive electrode sheet and the negative electrode sheet of the parallel unit to the electrode tabs, and then hot pressing to obtain the solid-state dual-electrode battery.

[0028] The specific series / parallel combination structure of the present invention is achieved through the above-mentioned preparation method.

[0029] In a third aspect, the present invention provides applications of the solid-state dual-electrode battery in the fields of power and energy storage.

[0030] The solid-state dual-electrode battery provided by the present invention has high voltage, high capacity, high energy density and high cycle stability, and has high application prospects in the fields of power vehicles, energy storage, aircraft, etc.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention adopts a specific structural combination to design a solid-state dual-electrode battery structure with both series and parallel connections inside the battery cell: the use of multi-layered parallel units can significantly increase the battery capacity, and to a certain extent improve the energy density of the solid-state battery and enhance the energy storage performance; combined with the conversion connection of the series units, it can also take into account the increase in battery voltage, and has high cycle stability. The solid-state dual-electrode battery has high voltage, high capacitance and energy density, and high cycle stability, which can meet the market's requirements for higher performance solid-state batteries and has a high application value. It can be used in the fields of power vehicles, energy storage, aircraft, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a solid-state dual-electrode battery in series and in parallel according to Example 1;

[0034] Figure 2 This is a schematic diagram of the structure of a two-series and three-parallel solid-state dual-electrode battery of Example 2;

[0035] Figure 3 This is a schematic diagram of the structure of a solid-state double-electrode battery with one series and n parallels in the present invention;

[0036] Figure 4 This is a graph showing the cycling performance results of the solid-state dual-electrode battery of Example 6. DETAILED DESCRIPTION

[0037] In order to better illustrate the purpose, technical scheme and advantages of the present invention, the present invention will be further described below in conjunction with specific examples. The test methods used in the following examples are conventional methods unless otherwise specified; the materials and reagents used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0038] Example 1

[0039] An embodiment of a solid-state dual-electrode battery of the present invention, the solid-state dual-electrode battery in this embodiment has a one-series-one-parallel structure.

[0040] The preparation method of the solid-state double-electrode battery described in this embodiment is:

[0041] Step 1: The positive electrode is composed of positive electrode material, ceramic material, aluminum foil and solid electrolyte; the positive electrode material includes active material NCM811, binder PVDF and conductive agent single-wall CNT, the mass ratio of which is 98:1.5:0.5, and is applied on both sides of the aluminum foil after homogenization, and the ceramic material alumina is applied on the edge to form a positive electrode plate. LLTO is selected as the solid electrolyte: LLTO is prepared into a slurry, and LLTO is applied to the positive electrode plate by coating. The thickness of the LLTO layer is 15μm, and the plate is dried and set aside;

[0042] The negative electrode adopts a lithium-copper composite electrode, in which lithium metal is used as the negative electrode and copper is used as the current collector as the negative electrode plate.

[0043] Step 2: Repeat the above preparation method of the positive electrode sheet on the aluminum side of the lithium copper aluminum composite strip, and then spray LLTO solid electrolyte on both sides as a series unit.

[0044] Step 3: stack the positive electrode sheet and the negative electrode sheet in parallel to form a parallel unit, and then connect the prepared series unit stack as a parallel and series conversion structure, and then continue to connect another positive electrode sheet and negative electrode sheet in parallel to form a parallel unit. At this time, the battery cell forms a one-series and one-parallel structure, as shown in the following example. Figure 1 shown.

[0045] Step 4: Weld the positive and negative electrode tabs in the parallel unit separately and hot press the whole unit to obtain a solid-state dual-electrode battery.

[0046] Example 2

[0047] An embodiment of a solid-state dual-electrode battery of the present invention, the solid-state dual-electrode battery in this embodiment has a two-series and three-parallel structure.

[0048] The preparation method of the solid-state double-electrode battery described in this embodiment is:

[0049] Step 1: The positive electrode is composed of positive electrode material, ceramic material, aluminum foil and solid electrolyte; the positive electrode material includes active material NCM811, binder PVDF and conductive agent single-wall CNT, the mass ratio of which is 98:1.5:0.5, and is applied on both sides of the aluminum foil after homogenization, and the ceramic material alumina is applied on the edge to form a positive electrode sheet;

[0050] The negative electrode adopts a lithium-copper composite electrode, with lithium metal as the negative electrode and copper as the current collector to form the negative electrode plate; LATP is selected as the solid electrolyte: LATP is prepared into a slurry, and LATP is applied to the negative electrode plate by coating. The thickness of the LATP layer is 15μm. The plate is dried and set aside for use.

[0051] Step 2: Repeat the above preparation method of the positive electrode sheet on the aluminum side of the lithium copper aluminum composite strip, and then spray LATP solid electrolyte on both sides as a series unit.

[0052] Step 3: stack three layers of positive and negative pole pieces in parallel to form a parallel unit, and then connect the prepared series unit stacks as a parallel and series conversion structure, and then continue to connect another positive pole piece and negative pole piece in parallel to form a parallel unit, and repeat the above steps to form a two-series and three-parallel structure. Figure 2 shown.

[0053] Step 4: Weld the positive and negative electrode tabs of the three-layer structure in the parallel unit separately and hot-press them as a whole to obtain a solid-state dual-electrode battery.

[0054] Example 3

[0055] An embodiment of a solid-state dual-electrode battery of the present invention, the solid-state dual-electrode battery in this embodiment has a one-series-five-parallel structure.

[0056] The preparation method of the solid-state double-electrode battery described in this embodiment is:

[0057] Step 1: The positive electrode is composed of positive electrode material, ceramic material, aluminum foil and solid electrolyte; the positive electrode material includes active material NCM811, binder PVDF and conductive agent single-wall CNT, the mass ratio of which is 98:1.5:0.5, and is applied on both sides of the aluminum foil after homogenization, and the ceramic material alumina is applied on the edge to form a positive electrode plate. LLZO is selected as the solid electrolyte: LLZO is prepared into a slurry, and LLZO is applied to the positive electrode plate by coating. The thickness of the LLZO layer is 15μm, and the plate is dried and set aside;

[0058] The negative electrode adopts a lithium-copper composite electrode, with lithium metal as the negative electrode and copper as the current collector to form the negative electrode plate.

[0059] Step 2: Repeat the above preparation method of the positive electrode sheet on the aluminum side of the lithium copper aluminum composite strip, and then spray LLZO solid electrolyte on both sides as a series unit.

[0060] Step 3: stack 5 layers of positive and negative pole pieces in parallel to form a parallel unit, and then connect the prepared series unit stacks as a parallel and series conversion structure, and then continue to connect another parallel unit formed by stacking 5 layers of positive and negative pole pieces in parallel, so that the battery cell forms a one-series five-parallel structure, such as Figure 3 shown.

[0061] Step 4: Weld the positive and negative electrode tabs of the five-layer structure in the parallel unit separately and hot-press them as a whole to obtain a solid-state dual-electrode battery.

[0062] Example 4

[0063] An embodiment of a solid-state dual-electrode battery of the present invention, the solid-state dual-electrode battery in this embodiment has a one-series-ten-parallel structure.

[0064] The method for preparing the solid-state dual-electrode battery described in this embodiment is different from that in Embodiment 3 only in that, in step 3, the number of laminated layers of the parallel units is 10, so that the battery cell forms a one-series-ten-parallel structure.

[0065] Example 5

[0066] An embodiment of a solid-state dual-electrode battery of the present invention, the solid-state dual-electrode battery in this embodiment has a two-series and ten-parallel structure.

[0067] The preparation method of the solid-state double-electrode battery described in this embodiment is:

[0068] Step 1: The positive electrode is composed of positive electrode material, ceramic material, aluminum foil and solid electrolyte; the positive electrode material includes active material NCM811, binder PVDF and conductive agent single-wall CNT, the mass ratio of which is 98:1.5:0.5, and is applied on both sides of the aluminum foil after homogenization, and the ceramic material alumina is applied on the edge to form a positive electrode plate. The solid electrolyte is LATP: LATP is prepared into a slurry, and LATP is applied to the positive electrode plate by coating. The thickness of the LATP layer is 15μm, and the plate is dried and set aside;

[0069] The negative electrode is made of a mixture of silicon carbon and graphite in a mass ratio of 2:8, and then mixed with CMC, PAA, CNT, and SBR in a mass ratio of 94:2:1.5:0.5:1. The negative electrode material is coated on copper foil as a negative electrode sheet.

[0070] Step 2: Repeat the above preparation method of the positive electrode sheet on the aluminum side of the lithium copper aluminum composite strip, and then spray LATP solid electrolyte on both sides as a series unit.

[0071] Step 3: Stack 10 layers of positive and negative pole sheets in parallel to form a parallel unit, then connect the prepared series unit stacks as a parallel and series conversion structure, and then continue to connect another parallel unit formed by stacking 10 layers of positive and negative pole sheets in parallel, and repeat the above steps to make the battery cell form a two-series and ten-parallel structure.

[0072] Step 4: Weld the positive and negative electrode tabs of the 10-layer structure in the parallel unit separately and hot-press them as a whole to obtain a solid-state dual-electrode battery.

[0073] Example 6

[0074] An embodiment of a solid-state dual-electrode battery of the present invention, the solid-state dual-electrode battery in this embodiment has a one-series-five-parallel structure.

[0075] The preparation method of the solid-state double-electrode battery described in this embodiment is:

[0076] Step 1: The positive electrode is composed of positive electrode material, ceramic material, aluminum foil and solid electrolyte; the positive electrode material includes active material NCM811, binder PVDF and conductive agent single-wall CNT, the mass ratio of which is 98:1.5:0.5, and is applied on both sides of the aluminum foil after homogenization, and the ceramic material alumina is applied on the edge to form a positive electrode sheet;

[0077] The negative electrode is made of a mixture of silicon carbon and graphite in a mass ratio of 2:8, and then mixed with CMC, PAA, CNT, and SBR in a mass ratio of 94:2:1.5:0.5:1. The negative electrode material is coated on copper foil as a negative electrode plate; LLTO is used as a solid electrolyte: LLTO is prepared into a slurry, and LLTO is applied to the negative electrode plate by coating. The thickness of the LLTO layer is 15μm. The plate is dried and set aside for use.

[0078] Step 2: Repeat the above preparation method of the positive electrode sheet on the aluminum side of the lithium copper aluminum composite strip, and then spray LLTO solid electrolyte on both sides as a series unit.

[0079] Step 3: Stack 5 layers of positive and negative pole sheets in parallel to form a parallel unit, then connect the prepared series unit stacks as a parallel and series conversion structure, and then continue to connect another parallel unit formed by stacking 5 layers of positive and negative pole sheets in parallel, so that the battery cell forms a one-series and five-parallel structure.

[0080] Step 4: Weld the positive and negative electrode tabs of the five-layer structure in the parallel unit separately and hot-press them as a whole to obtain a solid-state dual-electrode battery.

[0081] Example 7

[0082] The only difference between Example 7 and Example 1 is that in step 3, the positive electrode plates and the negative electrode plates are stacked in parallel for 5 layers to form a parallel unit, and the steps of series connection and stacking are repeated to form a four-series-five-parallel structure of the battery cell.

[0083] Example 8

[0084] The only difference between Example 8 and Example 1 is that in step 3, the positive electrode plates and the negative electrode plates are stacked in parallel by 10 layers to form a parallel unit, and the steps of series connection and stacking are repeated to form a four-series and ten-parallel structure of the battery cell.

[0085] Comparative Example 1

[0086] The only difference between Comparative Example 1 and Example 3 is that no series unit is prepared, and only 5 layers of positive electrode plates and negative electrode plates are stacked in parallel to form a single parallel solid-state battery.

[0087] Comparative Example 2

[0088] The only difference between Comparative Example 2 and Example 3 is that no series unit is prepared, and only 10 layers of positive electrode plates and negative electrode plates are stacked in parallel to form a single parallel solid-state battery.

[0089] Effect example

[0090] In order to explore the performance of the solid-state dual-electrode battery provided by the present invention, the standard voltage, capacity and energy density of the solid-state dual-electrode battery in all embodiments and comparative examples were measured, and the results are shown in Table 1;

[0091] In order to further explore the cycle performance of the solid-state dual-electrode battery of the present invention, the capacity retention rate of the solid-state dual-electrode battery in Example 6 was measured as a function of the number of cycles. The cycle performance results are shown in FIG. Figure 4 .

[0092] The standard voltage is the discharge energy divided by the discharge capacity, with 0.33C discharge capacity as the standard capacity, and the energy density is the discharge energy divided by the cell mass.

[0093] It can be seen from Table 1 that:

[0094] (1) It can be seen from the performance test results of the solid-state dual-electrode batteries in Examples 1-8 that the solid-state dual-electrode battery provided by the present invention has a good balance between high voltage and high capacity of the battery through a specific parallel / series connection method, and has a high energy density. The voltage can reach above 5V, the capacity is ≥1.5Ah, and the energy density is 300-450Wh / Kg.

[0095] (2) From the comparison of Examples 3 and 4 and Comparative Examples 1 and 2, it can be seen that by connecting a plurality of parallel units through at least one series unit, the standard voltage can be significantly increased to achieve a voltage ≥ 7V; and increasing the number of series units and the number of parallel stacks can both achieve a certain energy density improvement, giving the battery cell better performance as a whole.

[0096] (3) From the comparison of Examples 1, 7, and 8, it can be seen that as the number of series units m and the number of stacking layers n in the parallel units increase, the voltage and capacity of the solid-state dual-electrode battery are significantly improved, and the energy density is increased and the energy storage performance of the battery is improved.

[0097] Depend on Figure 4 It can be seen that the capacity retention rate of the solid-state dual-electrode battery provided by the present invention is still above 86% when the number of cycles is 400, and the cycle stability is good.

[0098] In summary, the solid-state dual-electrode battery provided by the present invention can well balance high voltage, high capacitance and energy density, and at the same time has high cycle stability, can adapt to the market demand for higher performance solid-state batteries, has high application value, and can be used in power vehicles, energy storage, aircraft and other fields.

[0099] Table 1 Effect data of solid-state dual-electrode batteries in embodiments and comparative examples

[0100]

[0101]

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A solid-state double-electrode battery, characterized in that: It includes parallel units and series units; in the parallel unit, the positive electrode plate is connected to the negative electrode plate through a solid electrolyte, and the plates are stacked to form n parallel units; the series unit includes a positive electrode side and a negative electrode side connected in series, and the positive electrode side and the negative electrode side are respectively connected to the negative electrode plate and the positive electrode plate of the parallel unit through a solid electrolyte; m series units are alternately connected to the parallel unit; m≥1, n≥1.

2. The solid-state dual-electrode battery according to claim 1, characterized in that: The series unit is composed of a positive electrode material layer, a composite tape and / or a negative electrode material layer connected in sequence, wherein the composite tape is a copper-aluminum composite tape or a lithium-copper-aluminum composite tape; the positive electrode material layer and the aluminum tape side of the composite tape constitute the positive electrode side; the negative electrode material layer or the lithium in the composite tape and the copper tape side of the composite tape constitute the negative electrode side.

3. The solid-state dual-electrode battery according to claim 1, characterized in that The positive electrode plate includes a positive electrode current collector and a positive electrode material layer distributed on at least one side of the positive electrode current collector, and the negative electrode plate includes a negative electrode current collector and a negative electrode material layer distributed on at least one side of the negative electrode current collector.

4. The solid-state double-electrode battery according to claim 2 or 3, characterized in that: The positive electrode material layer includes positive electrode material and ceramic material, and the ceramic material is distributed on the edge of the positive electrode material.

5. The solid-state dual-electrode battery according to claim 2 or 3, characterized in that: The negative electrode material of the negative electrode material layer is at least one of copper, lithium, silicon oxygen, silicon carbon and graphite.

6. The solid-state dual-electrode battery according to claim 4, characterized in that: The positive electrode material includes at least one of lithium cobalt oxide, lithium manganese oxide, nickel cobalt manganese, lithium iron phosphate, and lithium manganese iron phosphate; the ceramic material is at least one of alumina, LATP, LLZO, LLZTO, and boehmite.

7. The solid-state dual-electrode battery according to claim 1, characterized in that: The solid electrolyte is at least one of an oxide solid electrolyte, LLTO, LLZO, LATP, LLZTO, a sulfide solid electrolyte, and a halide solid electrolyte.

8. The solid-state dual-electrode battery according to claim 1, characterized in that: Said 5≤n≤30, 2≤m≤13.

9. The method for preparing a solid-state dual-electrode battery according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) coating or transferring the solid electrolyte on both sides of the positive electrode sheet or the negative electrode sheet, and then stacking the sheets alternately n times to obtain a parallel unit; (2) coating the negative electrode material on the copper foil side of the copper-aluminum composite strip and coating the positive electrode material and ceramic material on the aluminum foil side to obtain a series unit; or coating the positive electrode material and ceramic material on the aluminum foil side of the lithium-copper-aluminum composite strip to obtain a series unit; (3) applying or transferring solid electrolytes on both sides of the series unit, alternately connecting the positive electrode sheets or negative electrode sheets of the parallel units, and connecting the parallel units through m series units; (4) Welding the positive electrode sheet and the negative electrode sheet of the parallel unit to the electrode tabs, and then hot pressing to obtain the solid-state dual-electrode battery.

10. Application of the solid-state dual-electrode battery according to any one of claims 1 to 8 in the fields of power and energy storage.

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