All-solid-state battery regeneration method and all-solid-state battery system

Abstract

To appropriately mitigate reaction unevenness in an all-solid-state battery.SOLUTION: A method for regenerating an all-solid-state battery includes the steps of: preparing an all-solid-state battery having a copper-free negative electrode; and performing overdischarge control of the all-solid-state battery. The overdischarge control is control for mitigating reaction unevenness, which is unevenness in the electrode reaction accompanying charging and discharging of the all-solid-state battery, by discharging the all-solid-state battery until the potential of the negative electrode becomes lower than the copper elution potential.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a method for recycling an all-solid-state battery and an all-solid-state battery system. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2022-84373 (Patent Document 1) discloses a method for regenerating a stacked battery having a bipolar structure. This regeneration method includes a CC discharge process in which the stacked battery is subjected to constant current discharge (CC discharge) until the total voltage reaches a lower limit voltage, and a CV discharge process in which the stacked battery is subjected to constant voltage discharge (CV discharge) after the CC discharge process while maintaining the lower limit voltage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-84373 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, in secondary batteries containing lithium ions (hereinafter also referred to as "Li ions"), unevenness in the electrode reaction (desorption / insertion of Li ions) associated with charging and discharging can occur. Hereinafter, this unevenness will be referred to as "reaction unevenness." All-solid-state batteries do not contain a fluid electrolyte solution, but contain a solid electrolyte that does not have fluidity. Therefore, in all-solid-state batteries, electrode reactions are more likely to be non-uniform (in other words, local electrode reactions are more likely to occur) than in lithium ion batteries (so-called liquid-based batteries) that contain a fluid electrolyte solution, making reaction unevenness more likely to occur and making it difficult to alleviate the reaction unevenness that occurs. Reaction unevenness may cause a deterioration in the characteristics of the all-solid-state battery. Therefore, it is desirable to appropriately alleviate reaction unevenness in all-solid-state batteries.

[0005] The present disclosure has been made to solve the above problems, and one of the purposes of the present disclosure is to appropriately alleviate reaction unevenness in all-solid-state batteries. [Means for solving the problem]

[0006] (1) A method for recycling an all-solid-state battery according to a first aspect of the present disclosure includes the steps of preparing an all-solid-state battery having a copper-free negative electrode and performing overdischarge control of the all-solid-state battery. The overdischarge control is a control for mitigating reaction unevenness, which is unevenness in electrode reactions accompanying charge and discharge of the all-solid-state battery, by discharging the all-solid-state battery until the potential of the negative electrode becomes lower than the copper elution potential.

[0007] (2) Overdischarge control is a control in which the all-solid-state battery is discharged until the elapsed time after the potential of the negative electrode becomes lower than the copper elution potential exceeds a predetermined time.

[0008] (3) Overdischarge control is a control in which the all-solid-state battery is discharged until the potential of the negative electrode reaches a predetermined potential that is lower than the copper dissolution potential and higher than the nickel dissolution potential.

[0009] (4) The step of performing over-discharge control includes the step of performing over-discharge control when reusing or replacing the all-solid-state battery.

[0010] (5) The step of performing over-discharge control includes a step of performing over-discharge control when, in timer charging of the all-solid-state battery, a waiting time until the charging start time of the all-solid-state battery is longer than a reference time.

[0011] (6) The negative electrode contains a negative electrode active material having a silicon clathrate II type crystalline phase. (7) An all-solid-state battery system according to a second aspect of the present disclosure is an all-solid-state battery system for regenerating an all-solid-state battery having a copper-free negative electrode, the all-solid-state battery system including a power converter that discharges the all-solid-state battery and a control device that controls the power converter. The control device controls the power converter so that the all-solid-state battery is discharged until the potential of the negative electrode becomes lower than the copper elution potential, thereby mitigating reaction unevenness, which is unevenness in electrode reactions accompanying charging and discharging of the all-solid-state battery. [Effects of the Invention]

[0012] According to the present disclosure, reaction unevenness in an all-solid-state battery can be appropriately alleviated. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration of a processing system for an all-solid-state battery according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a diagram illustrating a schematic configuration of an all-solid-state battery. [Figure 3] 5 is a flowchart showing a first example of a procedure for overdischarge control according to the present embodiment. [Figure 4] 10 is a flowchart showing a second example of the procedure for overdischarge control according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] <Terminology> In the embodiments of the present disclosure, elements expressed in the singular include the plural unless otherwise specified. For example, a "particle" can mean not only "one particle" but also "an aggregate of particles (powder, powder, particle group)."

[0015] When a compound is expressed by a stoichiometric formula, the stoichiometric formula is merely a representative example of the compound. The compound may have a non-stoichiometric composition. For example, when lithium cobalt oxide is expressed as "LiCoO2," unless otherwise specified, the lithium cobalt oxide is not limited to a composition ratio of "Li / Co / O = 1 / 1 / 2" and may contain Li, Co, and O in any composition ratio. Furthermore, doping or substitution with trace elements is also permitted.

[0016] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0017] [Embodiment Mode] <System configuration> FIG. 1 is a diagram showing an example of the configuration of a processing system for all-solid-state batteries according to an embodiment of the present disclosure. The processing system 1 for all-solid-state batteries is installed, for example, in a facility where used all-solid-state batteries are collected (a recycling factory for all-solid-state batteries). The processing system 1 includes a controller 10, an input device 20, an output device 30, and a power conversion device 40. The components of the processing system 1 are connected to each other via a communication bus.

[0018] The controller 10 controls the power conversion device 40 to execute processing for regenerating the all-solid-state battery 50. The controller 10 includes a processor 11, a memory 12, a storage 13, and a network interface 14.

[0019] The processor 11 is a microprocessor such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit). The memory 12 is a volatile memory such as a RAM (Random Access Memory). The storage 13 is a rewritable non-volatile memory such as a HDD (Hard Disk Drive), an SSD (Solid State Drive), or a flash memory. The storage 13 stores a system program 131 including an OS (Operating System), a control program 132 including computer-readable code necessary for control calculations, and battery management data 133 storing various parameters (described later) for managing the all-solid-state battery. The processor 11 performs various processes by reading the system program 131 and the control program 132 (described later), expanding them into the memory 12, and executing them. The processor 11 also uses the battery management data 133 to manage the all-solid-state battery 50 to be processed. The network interface 14 controls communication (such as sending and receiving control commands) between the controller 10 and other devices in the processing system 1.

[0020] While FIG. 1 shows an example in which the controller 10 includes one processor 11, the controller 10 may include multiple processors. That is, the controller 10 includes one or more processors. The same applies to the memory 12 and the storage 13. In this specification, the term "processor" is not limited to a processor in the narrow sense that executes processing using a stored program, but may also include hardwired circuits such as an ASIC (Application Specific Integrated Circuit) and an FPGA (Field-Programmable Gate Array). Therefore, the term "processor" can also be interpreted as a processing circuitry in which processing is predefined by computer-readable code and / or hardwired circuitry.

[0021] The input device 20 is a switch, keyboard, mouse, or the like, and receives input operations from an operator for controlling (described later) the all-solid-state battery 50. The output device 30 is, for example, a display, and outputs various information (processing results, etc.) to the operator.

[0022] The power conversion device 40 is, for example, a DC / DC converter or a DC / AC converter. The power conversion device 40 is connected between the all-solid-state battery 50 and an electrical load (not shown). The power conversion device 40 is configured to discharge the power stored in the all-solid-state battery 50 to the electrical load in accordance with a control command from the controller 10.

[0023] 1, the all-solid-state battery 50 is not a component of the all-solid-state battery processing system 1, but the all-solid-state battery 50 may be a part of the processing system 1. Next, the configuration of the all-solid-state battery 50 will be described.

[0024] <All-solid-state battery> 2 is a diagram schematically illustrating the configuration of an all-solid-state battery 50. The all-solid-state battery 50 includes, as power storage elements, a positive electrode 51, a negative electrode 52, and a solid electrolyte layer 53. The all-solid-state battery 50 may also include an exterior body (not shown) for housing the power storage elements. The exterior body is, for example, a pouch made of a metal foil laminate film.

[0025] The all-solid-state battery 50 may be a single cell (cell) or a stacked battery. The stacked battery may be a monopolar stacked battery (a parallel-connected stacked battery) or a bipolar stacked battery (a series-connected stacked battery). The shape of the battery may be, for example, any of a coin type, a laminate type, a cylindrical type, and a prismatic type.

[0026] ≪Positive electrode≫ The positive electrode 51 includes a positive electrode active material layer 511 and a positive electrode current collector 512. The positive electrode active material layer 511 is formed by applying a positive electrode slurry (prepared by kneading the material of the positive electrode active material layer 511 and a solvent) to the surface of the positive electrode current collector 512 and drying the applied slurry. The positive electrode active material layer 511 is in close contact with the solid electrolyte layer 53. The thickness of the positive electrode active material layer 511 is, for example, not less than 0.1 μm and not more than 1000 μm.

[0027] The positive electrode active material layer 511 includes a positive electrode active material. The positive electrode active material is, for example, an oxide active material. Li2S, for example, can also be used as the positive electrode active material. The positive electrode active material may be, for example, particulate. The average particle size (D50) of the positive electrode active material is not particularly limited, but may be, for example, 10 nm or more, or 100 nm or more. On the other hand, the average particle size (D50) of the positive electrode active material is, for example, 50 μm or less, or may be 20 μm or less.

[0028] The oxide active material is, for example, LiCoO2, LiMnO2, LiNiO2, LiVO2, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O=rock salt layered active materials such as LiMn2O4, Li4Ti5O 12 , Li(Ni 0.5 Mn 1.5The oxide active material may be a spinel-type active material such as LiFePO4, LiMnPO4, LiNiPO4, or LiCoPO4, or an olivine-type active material such as LiFePO4, LiMnPO4, LiNiPO4, or LiCoPO4. A coating layer containing a Li-ion conductive oxide may be formed on the surface of the oxide active material. This can suppress the reaction between the oxide active material and the solid electrolyte (particularly a sulfide solid electrolyte). The Li-ion conductive oxide is, for example, LiNbO3. The thickness of the coating layer is, for example, 1 nm or more and 30 nm or less.

[0029] The positive electrode active material layer 511 may further include at least one of a solid electrolyte, a conductive material, and a binder. The solid electrolyte may be, for example, a sulfide solid electrolyte, an oxide solid electrolyte, a nitride solid electrolyte, an inorganic solid electrolyte (such as a halide solid electrolyte), or an organic polymer electrolyte (such as a polymer electrolyte). The sulfide solid electrolyte may include, for example, Li, X (X is at least one of P, As, Sb, Si, Ge, Sn, B, Al, Ga, and In), and S. The sulfide solid electrolyte may further include, for example, O, Si, etc. The sulfide solid electrolyte may further include, for example, a halogen (such as F, Cl, Br, or I). The sulfide solid electrolyte may be, for example, a glass ceramic type or an argyrodite type. The sulfide solid electrolyte may include, for example, at least one selected from the group consisting of LiI-LiBr-Li3PS4, Li2S-SiS2, LiI-Li2S-SiS2, LiI-Li2S-P2S5, LiI-Li2O-Li2S-P2S5, LiI-Li2S-P2O5, LiI-Li3PO4-P2S5, Li2S-P2S5, and Li3PS4.

[0030] The conductive material is, for example, a carbon material, metal particles, or a conductive polymer. The carbon material may be, for example, a particulate carbon material such as acetylene black (AB) or ketjen black (KB), or a fibrous carbon material such as carbon fiber, carbon nanotube (CNT), or carbon nanofiber (CNF). The binder is, for example, a rubber-based binder or a fluoride-based binder.

[0031] Positive electrode current collector 512 may include, for example, Al (aluminum) foil, etc. Positive electrode current collector 512 may have a thickness of, for example, 5 to 50 μm.

[0032] ≪Negative electrode≫ The negative electrode 52 includes a negative electrode active material layer 521 and a negative electrode current collector 522. The negative electrode active material layer 521 is formed by applying a negative electrode slurry (a slurry prepared by kneading the material of the negative electrode active material layer 521 with a solvent) to the surface of the negative electrode current collector 522 and drying the applied slurry. The negative electrode active material layer 521 is in close contact with the solid electrolyte layer 53. The thickness of the negative electrode active material layer 521 is, for example, not less than 0.1 μm and not more than 1000 μm.

[0033] The negative electrode active material layer 521 contains a negative electrode active material, such as graphite, Si, or SiO x (0 <x<2)、およびLi4Ti5O 12 It may contain at least one selected from the group consisting of:

[0034] The negative electrode active material preferably has a silicon clathrate II crystal phase. In the silicon clathrate II crystal phase, multiple silicon elements form polyhedrons (cages) containing pentagons or hexagons. These polyhedrons have spaces that can encapsulate metal ions such as Li ions. By inserting metal ions into these spaces, volumetric changes in the negative electrode 52 due to charging and discharging can be suppressed.

[0035] Generally, in all-solid-state batteries, a high confining pressure is required to form good ionic and electronic conductive paths and to suppress volume changes during charging and discharging. Specifically, the confining pressure is, for example, 0.1 MPa or more, or may be 1 MPa or more, or 5 MPa or more. On the other hand, the confining pressure is, for example, 100 MPa or less, or may be 50 MPa or less, or may be 20 MPa or less. The confining pressure can be reduced by using a negative electrode active material having a silicon clathrate type II crystalline phase.

[0036] The negative electrode active material (negative electrode active material particles) preferably has voids inside the primary particles. The void volume A, where the pore diameter is 100 nm or less, may be greater than 0.15 cc / g and less than 0.25 cc / g. Alternatively, the void volume B, where the pore diameter is 50 nm or less, may be greater than 0.10 cc / g and less than 0.17 cc / g. When primary particles having a silicon clathrate II crystal phase have voids inside, the voids also contribute to suppressing volumetric changes, thereby further suppressing volumetric changes due to charge and discharge. Furthermore, when the primary particles have many microvoids with a pore diameter of 100 nm or less or many microvoids with a pore diameter of 50 nm or less, volumetric changes due to charge and discharge can be uniformly alleviated. Furthermore, the presence of many microvoids can suppress collapse of the voids due to pressing.

[0037] The negative electrode active material layer 521 may further include a solid electrolyte, a conductive material, and a binder. These materials are similar to the materials described in the section on the positive electrode, and therefore, description thereof will not be repeated. The solid electrolytes of the positive electrode active material layer 511 and the negative electrode active material layer 521 may be the same or different. The same applies to the conductive material and the binder.

[0038] The negative electrode current collector 522 includes, for example, Ni (nickel) foil. On the other hand, the negative electrode current collector 522 does not include Cu (copper) foil. The oxidation-reduction potential of copper is higher than the oxidation-reduction potential of lithium metal (vs. Li / Li + ) is around 3.5 V. The oxidation-reduction potential of nickel is lower than that of copper, around 2.8 V (vs. Li / Li+). The material of the negative electrode current collector 522 is not limited to nickel, and may be other metals (such as SUS) having an oxidation-reduction potential lower than that of copper, or carbon (such as a conductive carbon sheet). The negative electrode current collector 522 may have a thickness of, for example, 5 to 50 μm.

[0039] ≪Solid electrolyte layer≫ The solid electrolyte layer 53 is interposed between the positive electrode 51 and the negative electrode 52. The solid electrolyte layer 53 separates the positive electrode 51 from the negative electrode 52. The thickness of the solid electrolyte layer 53 is, for example, not less than 0.1 μm and not more than 1000 μm.

[0040] The solid electrolyte layer 53 includes a solid electrolyte. The solid electrolyte layer 53 may further include a binder. These materials are similar to the materials described in the section on the positive electrode, and therefore description thereof will not be repeated. The solid electrolytes of the solid electrolyte layer 53 and the positive electrode active material layer 511 may be the same or different. The solid electrolytes of the solid electrolyte layer 53 and the negative electrode active material layer 521 may be the same or different. The same applies to the binder.

[0041] <Uneven reaction> In the all-solid-state battery 50, electrode reactions are more likely to be non-uniform than in liquid-based batteries. More specifically, in the negative electrode 52, a Li-ion desorption reaction occurs more preferentially in a region closer to the solid electrolyte layer 53, which does not have fluidity, than in a region farther from the solid electrolyte layer 53. Conversely, in the positive electrode 51, a Li-ion insertion reaction occurs more preferentially in a region closer to the solid electrolyte layer 53, which does not have fluidity, than in a region farther from the solid electrolyte layer 53. Therefore, "reaction unevenness," which is unevenness in the electrode reaction accompanying charge and discharge, is more likely to occur. In addition, because the all-solid-state battery 50 does not contain a fluid electrolyte solution, it is difficult to alleviate the generated reaction unevenness. The reaction unevenness may cause a deterioration in the characteristics of the all-solid-state battery 50 (such as an increase in the internal resistance of the all-solid-state battery 50). Therefore, it is desirable to appropriately alleviate the reaction unevenness of the all-solid-state battery 50.

[0042] Therefore, in the present embodiment, the controller 10 executes overdischarge control of the all-solid-state battery 50. Overdischarge control is control that alleviates reaction unevenness by discharging the all-solid-state battery 50 until the potential of the negative electrode 52 (negative electrode current collector 522) becomes lower than the copper elution potential. In this example, the negative electrode current collector 522 includes Ni foil. When the potential of the negative electrode 52 reaches a potential lower than the copper elution potential (but higher than the nickel elution potential), the all-solid-state battery 50 enters a sufficiently discharged state. Therefore, according to the present embodiment, reaction unevenness occurring in the all-solid-state battery 50 can be appropriately alleviated.

[0043] <Processing flow> 3 is a flowchart showing a first example of a processing procedure for overdischarge control according to the present embodiment. The processing shown in this flowchart is executed when a predetermined condition is met (for example, at predetermined intervals). Each step is realized by software processing by the controller 10, but may also be realized by hardware (electrical circuitry) arranged within the controller 10. Hereinafter, steps are abbreviated as S. Although not shown, a situation is assumed in which an all-solid-state battery 50 has been prepared by an operator and is electrically connected to the power conversion device 40.

[0044] In S11, the controller 10 determines whether the all-solid-state battery 50 is a target for reuse or battery replacement. As an example, the type of the all-solid-state battery 50 (i.e., whether the all-solid-state battery 50 is a target for reuse / battery replacement or not) is recorded in the battery management data 133 based on an input operation by an operator. In this case, the controller 10 can determine whether the all-solid-state battery 50 is a target for reuse or battery replacement by referring to the battery management data 133.

[0045] Note that "reusing" an all-solid-state battery includes, but is not limited to, using the all-solid-state battery as a battery pack (reuse), and may also include disassembling the all-solid-state battery pack into cells (or a module consisting of multiple cells) and then reconstructing the battery pack from multiple cells (rebuild). On the other hand, "reusing" an all-solid-state battery does not include disassembling the battery pack down to the material level (material recycling).

[0046] If the all-solid-state battery 50 is a target for reuse or battery replacement (YES in S11), the controller 10 proceeds to S12. On the other hand, if the all-solid-state battery 50 is not a target for reuse or battery replacement (NO in S11), the controller 10 ends the series of processes without executing the subsequent processes.

[0047] In S12, the controller 10 starts over-discharging the all-solid-state battery 50. The controller 10 may start over-discharging the all-solid-state battery 50 when an input operation by the operator to the input device 20 is used as a trigger.

[0048] More specifically, the controller 10 discharges the all-solid-state battery 50 until the potential of the negative electrode 52 (negative electrode current collector 522) becomes lower than the elution potential of copper. In other words, the controller 10 discharges the all-solid-state battery 50 until the oxidation-reduction potential of the negative electrode 52 becomes lower than the oxidation-reduction potential of copper (approximately 3.5 V based on the oxidation-reduction potential of lithium metal).

[0049] The potential (single electrode potential) of the negative electrode 52 can be estimated using a known method from the potential difference (a value detected by a voltage sensor, not shown) between the positive electrode 51 and the negative electrode 52. Alternatively, a detected value of the potential of the negative electrode 52 based on the potential of a reference electrode (for example, a lithium metal electrode) may be used.

[0050] On the other hand, when the negative electrode current collector 522 includes Ni foil as in this embodiment, nickel may be eluted if the redox potential of the negative electrode 52 becomes lower than the redox potential of nickel (approximately 2.8 V based on the redox potential of lithium metal). Therefore, the controller 10 prevents the redox potential of the negative electrode 52 from becoming lower than the redox potential of nickel. While Ni foil has been used as an example here, this is merely an example, and potentials appropriate for other materials can also be used in the same way.

[0051] In S13, the controller 10 determines whether the condition for terminating overdischarge of the all-solid-state battery 50 has been met. The controller 10 determines that the condition for terminating overdischarge has been met, for example, when the time elapsed since the potential of the negative electrode 52 became lower than the copper elution potential exceeds a predetermined time. The elapsed time in this case is the time required for the reaction unevenness of the all-solid-state battery 50 to be alleviated (more preferably, eliminated), and is determined experimentally according to the specifications of the all-solid-state battery 50. The predetermined time is recorded in the battery management data 133.

[0052] Alternatively, the controller 10 may determine that the condition for terminating overdischarge is met when the redox potential of the negative electrode current collector 522 approaches the redox potential of nickel, which is lower than the redox potential of copper. In other words, the controller 10 may determine that the condition for terminating overdischarge is met when the redox potential of the negative electrode current collector 522 reaches a predetermined potential (a potential higher than the redox potential of nickel by a predetermined amount) that has a margin with respect to the redox potential of nickel. This predetermined potential is also experimentally determined according to the specifications of the all-solid-state battery 50 and is recorded in the battery management data 133.

[0053] If the termination condition is not met (NO in S13), the controller 10 returns the process to S12. This continues the overdischarge of the all-solid-state battery 50. If the termination condition is met (YES in S13), the controller 10 proceeds to the process in S14 and ends the overdischarge of the all-solid-state battery 50.

[0054] Although not shown, the processing system 1 for an all-solid-state battery may be mounted on a vehicle, and the all-solid-state battery 50 may be a component of the processing system 1. In this case, the processing as shown in Fig. 4 may be executed instead of Fig. 3. In this example, the vehicle equipped with the processing system 1 for an all-solid-state battery is configured to start charging at a predetermined charging start time (so-called timer charging).

[0055] 4 is a flowchart showing a second example of the processing procedure of overdischarge control according to the present embodiment. In S21, the controller 10 determines whether the waiting time until the start time of timer charging is longer than a predetermined reference time REF. If the all-solid-state battery 50 is overdischarged even though there is almost no time left until the start time of timer charging, there is a possibility that charging of the all-solid-state battery 50 will not be completed by the time specified by the vehicle user. The reference time REF is, for example, the time required to overdischarge the all-solid-state battery 50, and then charge the all-solid-state battery 50 to return it to a predetermined SOC (State Of Charge) by the start time of timer charging. The reference time REF is experimentally determined according to the specifications of the power conversion device 40 (such as the control upper limit of charge / discharge power) and the specifications of the all-solid-state battery 50 (such as the magnitude of power that can be charged / discharged, the cooling capacity of the all-solid-state battery 50).

[0056] If the waiting time until the start time of timer charging is longer than the reference time REF (YES in S21), the controller 10 proceeds to S22. On the other hand, if the waiting time is equal to or shorter than the reference time REF (NO in S21), the controller 10 ends the series of processes. The subsequent processes of S22 to S24 are the same as the processes of S12 to S14 described with reference to FIG. 3, and therefore will not be described repeatedly.

[0057] As described above, in the present embodiment, the all-solid-state battery 50 is discharged by overdischarge control of the all-solid-state battery 50 until the potential of the negative electrode 52 (negative electrode current collector 522) becomes lower than the copper elution potential. As a result, the potential of the negative electrode 52 reaches a potential lower than the copper elution potential, and the all-solid-state battery 50 is sufficiently discharged. Therefore, according to the present embodiment, it is possible to appropriately alleviate reaction unevenness in the all-solid-state battery.

[0058] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0059] 1 Processing system, 10 Controller, 11 Processor, 12 Memory, 13 Storage, 131 System program, 132 Control program, 133 Battery management data, 14 Network interface, 20 Input device, 30 Output device, 40 Power conversion device, 50 All-solid-state battery, 51 Positive electrode, 511 Positive electrode active material layer, 512 Positive electrode current collector, 52 Negative electrode, 521 Negative electrode active material layer, 522 Negative electrode current collector, 53 Solid electrolyte layer.

Claims

1. providing an all-solid-state battery having a copper-free anode; performing over-discharge control of the all-solid-state battery; the overdischarge control is a control for mitigating reaction unevenness, which is unevenness in electrode reactions accompanying charging and discharging of the all-solid-state battery, by discharging the all-solid-state battery until a predetermined time has elapsed since the potential of the negative electrode reached a predetermined potential that is lower than a copper elution potential and higher than a nickel elution potential.

2. The method for regenerating an all-solid-state battery according to claim 1 , wherein the step of performing the over-discharge control includes a step of performing the over-discharge control when the all-solid-state battery is reused or replaced.

3. 2. The method for regenerating an all-solid-state battery according to claim 1, wherein the step of performing the over-discharge control includes a step of performing the over-discharge control when, in timer charging of the all-solid-state battery, a waiting time until a charging start time of the all-solid-state battery is longer than a reference time.

4. The method for regenerating an all-solid-state battery according to claim 1 , wherein the negative electrode contains a negative electrode active material having a silicon clathrate II crystal phase.

5. An all-solid-state battery system for recycling an all-solid-state battery having a copper-free negative electrode, a power conversion device that discharges the all-solid-state battery; a control device that controls the power conversion device, the control device controls the power conversion device so that the all-solid-state battery is discharged until a predetermined time has elapsed since the potential of the negative electrode reached a predetermined potential that is lower than the elution potential of copper and higher than the elution potential of nickel, thereby mitigating reaction unevenness, which is unevenness in electrode reactions accompanying charging and discharging of the all-solid-state battery.

Images