Solid electrolyte and method for producing the same

Abstract

A solid electrolyte according to the present invention comprises Li, Si, P, S, and Cl. The value of the content of Si with respect to the content of P is 0.80-1.10. In an XRD measurement, there is a peak A at the position where 2θ=29.55°±0.15°. When peak B is defined as the peak at the position where 2θ=29.2°±0.15°, peak C is defined as the peak at the position where 2θ=30.0°±0.3°, IA is defined as the intensity of peak A, IB is defined as the intensity of peak B, and IC is defined as the intensity of peak C, the ratio of IB to IA is not more than 0.08, and the ratio of the sum of IB and IC to IA is not more than 0.10.

Description

[Technical Field]

[0001] The present invention relates to a solid electrolyte and a method for producing the same. [Background technology]

[0002] Li is one of the solid electrolytes that has lithium ion conductivity. 10 GeP2S 12 This is known. This solid electrolyte is called "LGPS," taking the first letters of its constituent elements (see Non-Patent Literature 1). Although LGPS is promising as a solid electrolyte, solid batteries using LGPS as the solid electrolyte do not significantly surpass the characteristics of existing electrolyte-based batteries.

[0003] Therefore, as a solid electrolyte having a similar crystal structure to LGPS but with improved properties than LGPS, Li x Si y P z S 1-x-y-z-w X w A solid electrolyte has been proposed having the composition (0.37≦x≦0.40, 0.054≦y≦0.078, 0.05≦z≦0.07, 0≦w≦0.05, where X is at least one of F, Cl, Br, and I) (see Patent Document 1). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] US2016 / 248119A1 [Non-patent literature]

[0005] [Non-Patent Document 1] Grant-in-Aid for Scientific Research NEWS, 2016, VOL.3, p.9 [Overview of the Initiative]

[0006] Although the solid electrolyte described in Patent Document 1 has higher lithium conductivity than LGPS, further performance improvement is desired from the viewpoint of obtaining a practical solid battery. In addition, since the solid electrolyte described in the same document needs to be manufactured by firing the raw materials in a vacuum-sealed state in a quartz tube for the purpose of suppressing the generation of impurity phases, there is a disadvantage that it is difficult to mass-produce industrially.

[0007] Therefore, an object of the present invention is to provide a solid electrolyte and a method for manufacturing the same that can solve various drawbacks of the conventional technology described above.

[0008] The present invention includes a lithium (Li) element, a silicon (Si) element, a phosphorus (P) element, a sulfur (S) element, and a chlorine (Cl) element, the value of the content of the silicon (Si) with respect to the content of the phosphorus (P) is 0.80 or more and 1.10 or less, in X-ray diffraction measurement using CuKα as a radiation source, it has a peak A at a position of 2θ = 29.55° ± 0.15°, taking the peak at a position of 2θ = 29.2° ± 0.15° as peak B and the peak at a position of 2θ = 30.0° ± 0.3° as peak C, taking the intensity of the peak A as I A and the intensity of the peak B as I B and the intensity of the peak C as I C when, the ratio of the I A to the I B is 0.08 or less, and the ratio of the I A to the sum of the I B and the I C is 0.10 or less, it provides a solid electrolyte.

[0009] Further, the present invention provides a step of preparing a raw material composition containing a lithium (Li) element, a silicon (Si) element, a phosphorus (P) element, a sulfur (S) element, and a chlorine (Cl) element, and a firing step of firing the raw material composition under the flow of an inert gas or hydrogen sulfide gas, and provides a method for manufacturing a solid electrolyte.

Brief Description of the Drawings

[0010] [Figure 1] Figure 1 is an X-ray diffraction pattern diagram of the solid electrolytes obtained in Examples 3, 4, 6, and 8. [Figure 2] Figure 2 is an X-ray diffraction pattern diagram of the solid electrolytes obtained in Comparative Examples 3, 6, 7, and 8.

Mode for Carrying Out the Invention

[0011] Hereinafter, the present invention will be described based on its preferred embodiments. The solid electrolyte of the present invention contains lithium (Li) element, silicon (Si) element, phosphorus (P) element, sulfur (S) element, and chlorine (Cl) element as its constituent elements. The solid electrolyte of the present invention containing these elements can be crystalline.

[0012] When the solid electrolyte of the present invention is subjected to X-ray diffraction (XRD) measurement, it shows diffraction peaks at specific angles 2θ. Specifically, in the XRD measurement using CuKα as the radiation source, the solid electrolyte of the present invention has peak A at the position of 2θ = 29.55° ± 0.15°. A solid battery provided with the solid electrolyte having peak A at this position has improved performance compared to conventional solid batteries.

[0013] From the perspective of further improving the performance of the solid battery provided with the solid electrolyte of the present invention, it is preferable that the solid electrolyte of the present invention has peak D at the position of 2θ = 12.3° ± 0.15° in the XRD measurement using CuKα as the radiation source. Further, it is more preferable to have peak E at the position of 2θ = 20.2° ± 0.15°. Still further, it is even more preferable to have peak F at the position of 2θ = 23.9° ± 0.15°.

[0014] From the perspective of further improving the performance of the solid battery provided with the solid electrolyte, it is preferable that the solid electrolyte of the present invention further has diffraction peaks at the following positions in the XRD measurement using CuKα as the radiation source. · Peak G: 2θ = 20.4° ± 0.15° · Peak H: 2θ = 26.9° ± 0.15° • Peak I: 2θ = 29.0° ± 0.15°

[0015] The solid electrolyte of the present invention has an atomic ratio of Si / P of 0.80 to 1.10, where Si is the ratio of Si content to P content. The atomic ratio Si / P is preferably 0.85 or higher, and more preferably 0.90 or higher. On the other hand, the atomic ratio Si / P is preferably 1.05 or lower, and more preferably 1.03 or lower. Having the atomic ratio Si / P within the above range further enhances the lithium ion conductivity of the solid electrolyte.

[0016] The solid electrolyte of the present invention preferably has a Li content relative to Si content, i.e., an atomic ratio Li / Si of 6.0 to 8.1. The atomic ratio Li / Si is more preferably 6.5 or higher, and even more preferably 6.8 or higher. On the other hand, the atomic ratio Li / Si is more preferably 7.5 or lower, and even more preferably 7.3 or lower. Having the atomic ratio Li / Si within the above range further enhances the lithium ion conductivity of the solid electrolyte.

[0017] In the solid electrolyte of the present invention, it is also preferable that the ratio of the content of Cl element to the content of Si element among the elements constituting the solid electrolyte, i.e., the atomic ratio Cl / Si, is 0.18 or more and 0.35 or less. The atomic ratio Cl / Si is more preferably 0.20 or more, and even more preferably 0.22 or more. On the other hand, the atomic ratio Cl / Si is more preferably 0.30 or less, and even more preferably 0.25 or less. When the atomic ratio Cl / Si is within the above range, the lithium ion conductivity of the solid electrolyte is further enhanced.

[0018] The amount of Li element contained in the solid electrolyte of the present invention is preferably set to, for example, 12.4% by mass or more and 13.5% by mass or less. In particular, the amount of Li element contained in the solid electrolyte is more preferably 12.7% by mass or more, and even more preferably 13.0% by mass or more. On the other hand, the amount of Li element is more preferably 13.4% by mass or less, and even more preferably 13.3% by mass or less. When the amount of Li element is within the above range, the lithium ion conductivity of the solid electrolyte of the present invention is further enhanced.

[0019] In the solid electrolyte of the present invention, it is also preferable that the ratio of the content of element Li to the content of element P among the elements constituting the solid electrolyte, i.e., the atomic ratio Li / P, is 6.4 or more and 7.2 or less. The atomic ratio Li / P is more preferably 6.5 or more, and even more preferably 6.6 or more. On the other hand, the atomic ratio Li / P is more preferably 7.0 or less, and even more preferably 6.8 or less. When the atomic ratio Li / P is within the above range, the lithium ion conductivity of the solid electrolyte of the present invention is further enhanced.

[0020] The amount of Si element contained in the solid electrolyte of the present invention is preferably, for example, 6.6% by mass or more, more preferably 7.0% by mass or more, and even more preferably 7.2% by mass or more. On the other hand, the amount of Si element is preferably, for example, 8.4% by mass or less, more preferably 8.0% by mass or less, and even more preferably 7.8% by mass or less. When the amount of Si element is within the above range, the lithium ion conductivity of the solid electrolyte of the present invention is further enhanced.

[0021] The amount of element P contained in the solid electrolyte of the present invention is preferably, for example, 8.2% by mass or more, more preferably 8.4% by mass or more, and even more preferably 8.6% by mass or more. On the other hand, the amount of element P is preferably, for example, 9.3% by mass or less, more preferably 9.1% by mass or less, and even more preferably 8.9% by mass or less. When the amount of element P is within the above range, the lithium ion conductivity of the solid electrolyte of the present invention is further enhanced.

[0022] The amount of S element contained in the solid electrolyte of the present invention is preferably, for example, 67.6% by mass or more, more preferably 68.0% by mass or more, and even more preferably 68.4% by mass or more. On the other hand, the amount of S element is preferably, for example, 68.9% by mass or less, more preferably 68.8% by mass or less, and even more preferably 68.7% by mass or less. When the amount of S element is within the above range, the lithium ion conductivity of the solid electrolyte of the present invention is further enhanced.

[0023] The amount of Cl element contained in the solid electrolyte of the present invention is preferably, for example, 1.5% by mass or more, more preferably 2.0% by mass or more, and even more preferably 2.1% by mass or more. On the other hand, the amount of Cl element is preferably, for example, 3.0% by mass or less, more preferably 2.8% by mass or less, and even more preferably 2.6% by mass or less. When the amount of Cl element is within the above range, the lithium ion conductivity of the solid electrolyte of the present invention is further enhanced.

[0024] The amount of each element contained in the solid electrolyte of the present invention can be measured by various elemental analysis methods, such as ICP emission spectroscopy.

[0025] The solid electrolyte of the present invention may contain any elements other than those mentioned above, as long as it achieves the effects of the present invention, and may consist only of Li, Si, P, S, and Cl.

[0026] The solid electrolyte of the present invention preferably has a crystalline phase derived from the peaks A, D, E, F, G, H, and I described above (hereinafter sometimes referred to as "the crystalline phase of the present invention"). Specifically, the crystalline phase of the present invention belongs to the tetragonal system with space group P42 / nmc and has a crystalline structure in which a tetrahedral framework composed of P and Si elements and S and Cl elements is arranged three-dimensionally. The solid electrolyte of the present invention may have the crystalline phase of the present invention as a single phase, or it may have the crystalline phase of the present invention and other crystalline phases, but the former is preferable from the viewpoint of further improving the lithium ion conductivity of the solid electrolyte. If the solid electrolyte of the present invention is the latter, it is preferable that it has the crystalline phase of the present invention as the main phase. Here, "main phase" means that the proportion of the total crystalline phase constituting the solid electrolyte of the present invention is 50% or more, more preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more.

[0027] The solid electrolyte of the present invention may contain impurities within a range that produces the desired effect. Specifically, when the solid electrolyte of the present invention is subjected to XRD measurement using CuKα as a radiation source, a diffraction peak B, which is thought to be caused by impurity B, may be observed at the position 2θ = 29.2° ± 0.15°. In the present invention, the intensity of the above-mentioned peak A is set to I A Let the intensity of peak B be I B When that happens, I A I B The ratio of I B / I A The value of should be 0.08 or less, for example, 0.05 or less, and more preferably 0.03 or less. B / I A The value of is most preferably zero, as this allows the effects of the present invention to be significantly enhanced.

[0028] Furthermore, when the solid electrolyte of the present invention is subjected to XRD measurement using CuKα as a radiation source, a diffraction peak C is sometimes observed at the position 2θ = 30.0° ± 0.3°, which is thought to be caused by an impurity C different from the impurity B mentioned above. In the present invention, the intensity of peak C is IC In that case, the above I A I B and I C It is the ratio of the sum of (I B +I C ) / I A The value of should be 0.10 or less, for example, 0.08 or less, and more preferably 0.05 or less. (I B +I C ) / I A The value of is most preferably zero, as this allows the effects of the present invention to be significantly enhanced.

[0029] Next, a preferred method for producing the solid electrolyte of the present invention will be described. First, a raw material composition used in the manufacture of a solid electrolyte is prepared. This raw material composition contains a Li source, a Si source, a P source, a S source, and a Cl source. As a source of lithium, for example, powders of lithium sulfide (Li2S), lithium oxide (Li2O), lithium carbonate (Li2CO3), and elemental lithium metal can be used. As a source of silicon, for example, powder of silicon sulfide, SiS2, can be used. As a source of phosphorus, for example, powders of phosphorus trisulfide (P2S3) or phosphorus pentasulfide (P2S5), which are sulfides of phosphorus, can be used. Li2S, SiS2, and P2S5 can also be compounds that are sources of sulfur. Therefore, when using Li2S, SiS2, and / or P2S5, it is not necessary to prepare a separate source of sulfur. As the Cl element source, for example, LiCl powder, PCl3 powder, and PCl5 powder can be used. LiCl may also be a compound of the Li element source. PCl3 and PCl5 may also be compounds of the P element source.

[0030] The proportions of Li, Si, P, S, and Cl elements in the raw material composition are adjusted to match the proportions of Li, Si, P, S, and Cl elements in the target solid electrolyte. Specifically, it is preferable to set the proportions of Li, Si, P, S, and Cl elements in the raw materials as follows. ·Li element content: 12.4% by mass or more and 13.5% by mass or less. • Si element content: 6.6% by mass or more and 8.4% by mass or less. • P element content: 8.2% by mass or more and 9.3% by mass or less. • S element content: 67.6% by mass or more and 68.9% or less. • Cl element content: 1.5% by mass or more and 3.0% or less.

[0031] Once the raw material composition has been prepared to achieve the preferred composition described above, it is thoroughly mixed to prepare a homogeneous composition that is sufficiently amorphous. There are no particular restrictions on the mixing method; for example, known powder mixing devices such as ball mills, bead mills, and attritors can be used. It is also possible to use a mechanical alloying method when mixing the raw material powder. In this case, by increasing the energy applied during mixing, the raw material powder is mixed uniformly at the atomic level, and a more uniform solid electrolyte can be obtained by calcining the resulting composition. However, if the energy applied during mixing is increased, the media placed in the mixing container along with the raw material powder may wear down and be introduced as impurities, which may adversely affect the properties of the resulting solid electrolyte. From this viewpoint, it is preferable to take care not to apply excessively high energy during mixing.

[0032] Once a raw material composition is prepared by mixing each component, the raw material composition is sieved to remove coarse particles and adjust the particle size distribution of the powdered raw material composition.

[0033] Next, the raw material composition is subjected to a calcination process to obtain the powder of the target solid electrolyte. One of the features of this manufacturing method is that the calcination of the raw material composition is carried out in an open system. Performing calcination in an open system means that, unlike calcination in a sealed space described in Patent Document 1 above, the reaction system in which calcination is carried out is not located in a closed space. Performing calcination in an open system is extremely advantageous in terms of improving manufacturing efficiency. With calcination in a sealed space described in Patent Document 1 above, a solid electrolyte with less impurity generation is obtained. However, with this manufacturing method, even though calcination is carried out in an open system, it is possible to successfully produce a solid electrolyte that contains the crystalline phase of the present invention described above and in which the generation of impurities is suppressed.

[0034] In the raw material composition, it is particularly preferable to set the atomic ratio Si / P value to 0.80 or more and 1.10 or less, that is, to reduce the Si element content compared to the solid electrolyte composition described in Patent Document 1 mentioned above, because this allows for the successful production of a solid electrolyte with suppressed impurity generation despite firing in an open system.

[0035] When calcining a raw material composition in an open system, it is preferable to use an inert gas or hydrogen sulfide (H2S) gas as the calcination atmosphere, as this allows for the successful production of the desired solid electrolyte. In this case, it is preferable to carry out the calcination under the flow of an inert gas or hydrogen sulfide gas, as this allows for the successful reaction of the raw material composition. As the inert gas, for example, a noble gas such as argon or nitrogen gas can be used.

[0036] When the raw material composition is calcined in a hydrogen sulfide gas atmosphere, the sulfur gas produced by the decomposition of hydrogen sulfide increases the sulfur partial pressure near the raw material composition. As a result, sulfur deficiencies are less likely to occur in the calcined product even when calcined at relatively high temperatures. Consequently, the electronic conductivity of the calcined product can be lowered. For this reason, the calcination temperature when calcining the raw material composition in a hydrogen sulfide gas atmosphere is preferably 400°C to 600°C, more preferably 450°C to 550°C, and even more preferably 450°C to 500°C.

[0037] When firing in an inert gas atmosphere, unlike firing in a hydrogen sulfide gas atmosphere, it is not possible to increase the sulfur partial pressure near the raw material composition. As a result, firing at high temperatures tends to easily generate sulfur deficiencies in the fired product. Consequently, the electron conductivity of the fired product increases. For this reason, the firing temperature when firing the raw material composition in an inert gas atmosphere is preferably lower than the firing temperature when firing in a hydrogen sulfide gas atmosphere. Specifically, it is preferable to set the firing temperature to 400°C or higher and 500°C or lower, and more preferably to 450°C or higher and 480°C or lower.

[0038] By generally setting the calcination time to between 4 and 8 hours, it is possible to successfully obtain a solid electrolyte that is close to a single phase with minimal impurity formation.

[0039] Once the calcined material is obtained in this way, it can be subjected to crushing or grinding treatments as needed, and then sieved to obtain a solid electrolyte powder having the desired particle size distribution.

[0040] Furthermore, some of the components that make up the raw material composition are extremely unstable in the atmosphere and react with moisture to decompose, generating hydrogen sulfide gas or undergoing oxidation. Therefore, it is preferable to carry out the operations when implementing this manufacturing method in a glove box or similar environment with an inert gas atmosphere.

[0041] The solid electrolyte obtained in this way can be used as the solid electrolyte layer of a solid lithium secondary battery. For example, in a solid battery comprising a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, the solid electrolyte of the present invention can be contained in the solid electrolyte layer. The solid electrolyte layer can be manufactured by methods such as supplying a slurry containing a solid electrolyte, binder, and solvent onto a substrate and scraping the slurry with a doctor blade, cutting the slurry with an air knife after bringing the substrate and slurry into contact, or forming a coating film from the slurry using a screen printing method, and then removing the solvent from the coating film. Alternatively, the solid electrolyte layer can be manufactured by compressing a powder of the solid electrolyte to create a compact, and then processing the compact as appropriate.

[0042] The solid electrolyte of the present invention can also be used in electrode mixtures such as positive electrode mixtures and negative electrode mixtures, which are obtained by mixing the solid electrolyte with an active material (positive electrode active material or negative electrode active material). As the positive electrode active material, for example, spinel-type lithium transition metal oxide, lithium transition metal oxide having a layered structure, or olivine, or a mixture of two or more of these can be used. For example, lithium titanate or silicon-based active materials can be used as the negative electrode active material. Furthermore, when carbon-based materials such as artificial graphite, natural graphite, or hard carbon, or metallic Li are used as the negative electrode active material, the solid electrolyte of the present invention can be used in the positive electrode mixture or solid electrolyte layer. Such usage is preferable from the viewpoint of improving energy density. [Examples]

[0043] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to these examples. Unless otherwise specified, "%" means "mass%".

[0044] [Examples 1 to 8 and Comparative Examples 1 to 8] Lithium sulfide (Li2S) powder, phosphorus pentasulfide (P2S5) powder, silicon sulfide (SiS2) powder, and lithium chloride (LiCl) powder were weighed to obtain the composition (mass%) shown in Table 1 below. Each component was weighed to a total of 75g, and the mixture was ground and mixed in a planetary ball mill for 20 hours to prepare a sufficiently amorphous raw material composition. This raw material composition was sieved to obtain a powder with a mesh size of 53 μm or less. This powder was calcined at 475°C for 6 hours in an open system under the atmosphere shown in Table 1 to obtain calcined powder. That is, calcination was carried out while the gases shown in Table 1 were circulated in the reaction system. The resulting calcined powder was crushed using a planetary ball mill, and then pulverized using the same method. The pulverized material was sieved to obtain a powder with a mesh size of less than 53 μm. In this way, a solid electrolyte powder was obtained.

[0045] 〔evaluation〕 The solid electrolytes obtained in the examples and comparative examples were subjected to XRD measurements and lithium-ion conductivity measurements using the following method. The results are shown in Table 2 below.

[0046] [XRD measurement] The solid electrolyte powder was packed into an airtight holder that was not exposed to air, in a glove box purged with sufficiently dry Ar gas (dew point below -60°C), and XRD measurements were performed. The XRD diffraction patterns of Examples 3, 4, 6, and 8, and Comparative Examples 3, 6, 7, and 8 are shown in Figures 1 and 2. The XRD measurement conditions were as follows. • Equipment name: Fully automated multi-purpose X-ray diffractometer SmartLab SE (manufactured by Rigaku Corporation) ·Radiation source:CuKα1 • Tube voltage: 40kV ·Tube current: 50mA ·Measurement method: Concentration method (reflection method) • Optical system: Multilayer mirror divergent beam method (CBO-α) • Detector: One-dimensional semiconductor detector • Incident solar slit: Solar slit 2.5° • Longitudinal limiting slit: 10mm • Solar light receiving slit: 2.5° • Entrance slit: 1 / 6° • Light-receiving slit: 2mm (open) • Measurement range: 2θ = 10~120° Step width: 0.02° • Scan speed: 1.0° / min

[0047] [Lithium-ion conductivity] The solid electrolyte powders obtained in the examples and comparative examples were subjected to a dispersal of approximately 6 t / cm³ in a glove box purged with thoroughly dried Ar gas (dew point below -60°C). 2 Lithium ion conductivity samples were prepared by uniaxial compression molding under a load, consisting of pellets with a diameter of 10 mm and a thickness of approximately 1 mm to 8 mm. Lithium ion conductivity was measured using a Solartron Analytical Solartron 1255B electrochemical measurement system (1280C) and an impedance / gain / phase analyzer (SI 1260). The measurement conditions were AC impedance method with a temperature of 25°C, a frequency of 100 Hz to 1 MHz, and an amplitude of 100 mV.

[0048] [Table 1]

[0049] [Table 2]

[0050] As is clear from the results shown in Tables 1 and 2, the solid electrolytes obtained in each example have higher lithium ion conductivity than the solid electrolytes obtained in the comparative example. [Industrial applicability]

[0051] The present invention provides a solid electrolyte that can further improve the performance of solid-state batteries. Furthermore, the present invention enables the productive manufacture of such solid electrolytes.

Claims

1. It contains lithium (Li), silicon (Si), phosphorus (P), sulfur (S), and chlorine (Cl), The ratio of the silicon (Si) element content to the phosphorus (P) element content is 0.80 or more and 1.10 or less. In X-ray diffraction measurements using CuKα as a source, peak A is located at 2θ = 29.55° ± 0.15°. Let the peak at 2θ = 29.2° ± 0.15° be Peak B, and the peak at 2θ = 30.0° ± 0.3° be Peak C. The intensity of the aforementioned peak A is I Ａ And the intensity of the aforementioned peak B is set to I Ｂ And the intensity of the aforementioned peak C is set to I Ｃ In that case, the above I Ａ The above I Ｂ The ratio of is 0.08 or less, and the above I Ａ The above I Ｂ and the above I Ｃ A solid electrolyte in which the ratio of the sum of the elements is 0.10 or less.

2. The solid electrolyte according to claim 1, wherein the value of the lithium (Li) element content relative to the silicon (Si) element content is 6.0 or more and 8.1 or less.

3. The solid electrolyte according to claim 1, wherein the value of the chlorine (Cl) element content relative to the silicon (Si) element content is 0.18 or more and 0.35 or less.

4. The lithium (Li) element content is 12.4% by mass or more and 13.5% by mass or less. The silicon (Si) element content is 6.6% by mass or more and 8.4% by mass or less. The phosphorus (P) element content is 8.2% by mass or more and 9.3% by mass or less. The sulfur (S) element content is 67.6% by mass or more and 68.9% by mass or less. The solid electrolyte according to claim 1, wherein the content of the chlorine (Cl) element is 1.5% by mass or more and 3.0% by mass or less.

5. The solid electrolyte according to claim 1, wherein, in an X-ray diffraction measurement using CuKα as a source, it has a peak D at a position of 2θ = 12.3° ± 0.15°, a peak E at a position of 2θ = 20.2° ± 0.15°, and a peak F at a position of 2θ = 23.9° ± 0.15°.

6. The solid electrolyte according to claim 5, wherein, in an X-ray diffraction measurement using CuKα as a source, it has a peak G at a position of 2θ = 20.4° ± 0.15°, a peak H at a position of 2θ = 26.9° ± 0.15°, and a peak I at a position of 2θ = 29.0° ± 0.15°.

7. An electrode mixture comprising a solid electrolyte and an active material according to any one of claims 1 to 6.

8. A solid electrolyte layer containing the solid electrolyte described in any one of claims 1 to 6.

9. A battery having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer between the positive electrode layer and the negative electrode layer, A battery containing the solid electrolyte described in any one of claims 1 to 6.

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