WO2024105730A1 - 固体電解質およびリチウムイオン電池 - Google Patents

固体電解質およびリチウムイオン電池 Download PDF

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WO2024105730A1
WO2024105730A1 PCT/JP2022/042226 JP2022042226W WO2024105730A1 WO 2024105730 A1 WO2024105730 A1 WO 2024105730A1 JP 2022042226 W JP2022042226 W JP 2022042226W WO 2024105730 A1 WO2024105730 A1 WO 2024105730A1
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solid electrolyte
powder
monoclinic phase
compound
lithium ion
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English (en)
French (fr)
Japanese (ja)
Inventor
援 八木
遥人 高橋
俊広 吉田
茜 向川
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NGK Insulators Ltd
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NGK Insulators Ltd
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Priority to JP2024558495A priority Critical patent/JPWO2024105730A1/ja
Priority to PCT/JP2022/042226 priority patent/WO2024105730A1/ja
Priority to KR1020257005905A priority patent/KR20250036931A/ko
Priority to EP22965707.7A priority patent/EP4621806A1/en
Priority to CN202280099368.0A priority patent/CN120113014A/zh
Publication of WO2024105730A1 publication Critical patent/WO2024105730A1/ja
Priority to US19/063,459 priority patent/US20250201912A1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
    • H01M10/0562—Solid materials
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F17/00—Compounds of rare earth metals
    • C01F17/30—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6
    • C01F17/36—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 halogen being the only anion, e.g. NaYF4
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G15/00—Compounds of gallium, indium or thallium
    • C01G15/006—Compounds containing gallium, indium or thallium, with or without oxygen or hydrogen, and containing two or more other elements
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G25/00—Compounds of zirconium
    • C01G25/006—Compounds containing zirconium, with or without oxygen or hydrogen, and containing two or more other elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/50—Solid solutions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/40—Electric properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0065—Solid electrolytes
    • H01M2300/0068—Solid electrolytes inorganic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0065—Solid electrolytes
    • H01M2300/0068—Solid electrolytes inorganic
    • H01M2300/008—Halides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a solid electrolyte and a lithium-ion battery.
  • JP 2011-129312 A discloses a solid electrolyte made of sulfide and an all-solid-state battery containing the solid electrolyte.
  • a solid electrolyte made of sulfide may react with moisture in the air and generate toxic hydrogen sulfide gas. Therefore, WO 2021/161604 (Document 2) and WO 2021/186833 (Document 3) propose a solid electrolyte made of a fluorine compound.
  • the solid electrolyte in Document 2 contains Li, Zr, Al, and F.
  • the solid electrolyte in Document 3 contains Li, Ti, Al, M, and F, where M is Zr or Mg.
  • the solid electrolytes made of fluorine compounds as described in References 2 and 3 improve safety, but have lithium ion conductivity of the order of 10 ⁇ 6 S/cm, which is not sufficient.
  • the present invention is directed to a solid electrolyte, and aims to provide a solid electrolyte that is highly safe and has high lithium ion conductivity.
  • the invention of aspect 1 is a solid electrolyte that contains a monoclinic phase of a compound containing Li, M (wherein M is a metal element or a metalloid element other than Li), and F as a main phase, and in an X-ray diffraction pattern obtained by X-ray diffraction measurement, the content of the monoclinic phase quantified by the RIR method is 65% or more.
  • the present invention provides a solid electrolyte that is highly safe and has high lithium ion conductivity.
  • the invention of embodiment 2 is the solid electrolyte of embodiment 1, in which the compound further contains X, which is at least one element selected from the group consisting of Cl, Br, and I.
  • the invention of embodiment 3 is the solid electrolyte of embodiment 2, in which M contains Ga.
  • a fourth aspect of the present invention is the solid electrolyte according to the second or third aspect, in which the composition formula of the compound is represented by Li 3 MF 6-a x a , and 0 ⁇ a ⁇ 6 is satisfied.
  • a fifth aspect of the invention is the solid electrolyte of the second or third aspect, wherein M includes M ⁇ which is a trivalent cation and M ⁇ which is a tetravalent cation, and the composition formula of the compound is represented by Li 3-b M ⁇ 1-b M ⁇ b F 6-a X a , and 0 ⁇ a ⁇ 6 and 0 ⁇ b ⁇ 1 are satisfied.
  • the invention of embodiment 6 is a solid electrolyte according to any one of embodiments 1 to 5, in which M contains Zr.
  • the invention of aspect 7 is a lithium ion battery containing the solid electrolyte of any one of aspects 1 to 6.
  • FIG. 1 is a vertical cross-sectional view showing an all-solid-state lithium ion secondary battery.
  • FIG. 2 is a diagram showing an X-ray diffraction pattern of a solid electrolyte powder.
  • FIG. 1 is a longitudinal sectional view showing an all-solid-state lithium-ion secondary battery 1 (hereinafter simply referred to as "all-solid-state secondary battery 1").
  • the all-solid-state secondary battery 1 has, from the top of FIG. 1, a positive electrode 11, an electrolyte layer 13, and a negative electrode 12. That is, the electrolyte layer 13 is provided between the positive electrode 11 and the negative electrode 12.
  • the electrolyte layer 13 is a solid electrolyte layer, and also serves as a separator layer.
  • the positive electrode 11 includes a current collector 111 and a positive electrode layer 112.
  • the positive electrode layer 112 includes a positive electrode active material.
  • the negative electrode 12 includes a current collector 121 and a negative electrode layer 122.
  • the negative electrode layer 122 includes a negative electrode active material.
  • the positive electrode active material of the positive electrode layer 112 preferably includes a lithium composite oxide.
  • a preferred positive electrode active material is a lithium composite oxide having a layered rock salt structure, for example, NCM (Li(Ni, Co, Mn)O 2 ).
  • the positive electrode active material may be another lithium composite oxide, for example, NCA (Li(Ni, Co, Al)O 2 ), LCO (LiCoO 2 ), LNMO (LiNi 0.5 Mn 1.5 O 4 ), or LFP (LiFePO 4 ), having a spinel structure, or olivine structure, or the like.
  • the positive electrode layer 112 further includes a solid electrolyte and an electronic conduction assistant (carbon black, etc.) to be described later.
  • the positive electrode layer 112 in this embodiment is formed by integrating these materials by applying pressure or heat.
  • Examples of the negative electrode active material of the negative electrode layer 122 include compounds such as LTO ( Li4Ti5O12 ), NTO ( Nb2TiO7 ), TiO2 (titanium oxide ), graphite, and SiO (silicon monoxide).
  • the negative electrode layer 122 contains a solid electrolyte, which will be described later, in addition to the negative electrode active material.
  • the negative electrode layer 122 may further contain an electron conduction assistant (carbon black, etc.).
  • the negative electrode layer 122 in this embodiment is formed by integrating these materials by applying pressure or heat.
  • the configurations and materials of the positive electrode 11 and negative electrode 12 of the all-solid-state secondary battery 1 are not limited to those described above, and various other configurations and materials can be used.
  • the electrolyte layer 13 is made of or contains the solid electrolyte according to the present invention (hereinafter also referred to as the "present solid electrolyte").
  • the solid electrolyte is a lithium (Li) ion conductive material.
  • the solid electrolyte contains lithium element (Li), an element (M) that is a metal element or a semimetal element other than Li, and fluorine element (F).
  • M may be only one type of element, or may contain two or more types of elements.
  • An example of M is an element that becomes a trivalent cation.
  • M preferably contains gallium (Ga), or may be only Ga.
  • M may contain another element that becomes a trivalent cation together with Ga, and an example of such an element is aluminum (Al).
  • the solid electrolyte does not contain sulfides and does not generate hydrogen sulfide gas. Therefore, a highly safe all-solid-state secondary battery 1 is provided.
  • metalloid elements are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), and tellurium (Te).
  • Metal elements are elements contained in groups 1 to 12 of the periodic table excluding hydrogen, and elements contained in groups 13 to 16 excluding the above metalloids and C, N, P, O, S, and Se. In other words, metal elements are a group of elements that can become cations when forming inorganic compounds with halogen compounds.
  • the solid electrolyte contains a monoclinic phase of a compound containing Li, M and F as a main phase.
  • the content of the monoclinic phase quantified by the RIR method is 65% or more in an X-ray diffraction pattern obtained by X-ray diffraction (XRD) measurement.
  • XRD X-ray diffraction
  • the compound preferably further contains X, which is at least one element selected from the group consisting of chlorine (Cl), bromine (Br) and iodine (I).
  • X more preferably contains Cl, and may be only Cl.
  • X replaces a portion of F in the compound.
  • the amount of substance of X in the compound may be less than or equal to the amount of substance of F, but greater than the amount of substance of F.
  • the composition formula of the compound is Li 3 MF 6-a X a ... (1) and 0 ⁇ a ⁇ 6 is satisfied.
  • the composition formula (1) it is more preferable that 0.05 ⁇ a ⁇ 2 is satisfied, and it is even more preferable that 0.05 ⁇ a ⁇ 1.5 is satisfied.
  • a may be 1 or less.
  • M is an element that becomes a trivalent cation, and may contain two or more elements (for example, Ga and Al).
  • the M includes M ⁇ which is a trivalent cation and M ⁇ which is a tetravalent cation.
  • the composition formula of the compound is: Li 3-b M ⁇ 1-b M ⁇ b F 6-a X a ... (2) and 0 ⁇ a ⁇ 6 and 0 ⁇ b ⁇ 1 are satisfied.
  • a may be 1 or less.
  • M ⁇ is Ga
  • M ⁇ is zirconium (Zr).
  • the amount of substance of M ⁇ in the compound is equal to or greater than the amount of substance of M ⁇ , but may be less than the amount of substance of M ⁇ .
  • an unknown solid electrolyte has composition formula (1) or (2)
  • Li, Ga, Al, and Zr can be quantified by ICP-emission spectroscopy.
  • F and Cl can be quantified by ion chromatography. If the solid electrolyte contains elements other than those mentioned above, a measurement method capable of quantifying the elements is appropriately selected.
  • composition formula (2) if the molar ratio values of Li, M ⁇ , M ⁇ , F, and X determined by analysis are within the range of ⁇ 10% (preferably ⁇ 5%) of the value of the above composition formula (2), it is considered that the above composition formula (2) is satisfied.
  • the solid electrolyte is manufactured, for example, by the following method.
  • a powder of a fluoride containing Li and a powder of a fluoride containing M are prepared.
  • the fluoride containing Li is, for example, LiF (lithium fluoride).
  • M lithium fluoride
  • the fluoride containing Ga is, for example, GaF 3 (gallium fluoride).
  • the fluoride containing Al is, for example, AlF 3 (aluminum fluoride).
  • M is Ga and Zr
  • the fluoride containing Zr is, for example, ZrF 4 (zirconium fluoride).
  • a powder of a halide containing Li (LiX) is prepared and mixed with the above powder.
  • the halide containing Li (LiX) is, for example, LiCl (lithium chloride), LiBr (lithium bromide), or LiI (lithium iodide).
  • a halide containing M may be used as a raw material, and the halide may be, for example, GaCl 3 (gallium chloride), ZrCl 4 (zirconium chloride), or may be a bromide containing M or an iodide containing M.
  • the mixture is then subjected to mechanical milling (mechanochemical milling).
  • mechanical milling mechanochemical milling
  • a planetary ball mill In a planetary ball mill, the pot rotates on its axis while the stage on which the pot is placed revolves, making it possible to generate very high impact energy.
  • the mechanical milling may be performed using other types of grinders.
  • powder of the present solid electrolyte is obtained, which is used for the positive electrode layer 112, the negative electrode layer 122, or the electrolyte layer 13.
  • the mechanical milling is performed at room temperature, but the temperature and other conditions may be changed as appropriate.
  • the present solid electrolyte may also be produced by a method other than mechanical milling, such as sintering.
  • Experimental Examples 2 to 9 are examples of the present invention in which the content of the monoclinic phase quantified by the RIR method is 65% or more, and Experimental Example 1 is a comparative example in which the content of the monoclinic phase is less than 65%.
  • Table 1 the values of a and b are also shown when the composition formula of the solid electrolyte is expressed as Li 3-b Ga 1-b Zr b F 6-a Cl a (in Experimental Examples 7 to 9, Al is further included).
  • Example 1 As raw materials, commercially available LiF powder and commercially available GaF3 powder were prepared. These powders were weighed so that the molar ratio of LiF: GaF3 was 3:1, and mechanical milling was performed using a planetary ball mill to obtain a solid electrolyte powder.
  • Example 2 In addition to the LiF powder and GaF3 powder, commercially available LiCl powder was prepared and weighed so that the molar ratio of LiF:LiCl: GaF3 was 2.9:0.1:1. Except for this, the same treatment as in Experimental Example 1 was performed to obtain a solid electrolyte powder.
  • Example 3 A solid electrolyte powder was obtained by the same treatment as in Experimental Example 1, except that LiF powder, LiCl powder and GaF3 powder were used and weighed so that the molar ratio of LiF:LiCl: GaF3 was 2.7:0.3:1.
  • Example 4 A solid electrolyte powder was obtained by carrying out the same process as in Experimental Example 1, except that LiF powder, LiCl powder and GaF3 powder were used and weighed so that the molar ratio of LiF:LiCl: GaF3 was 2.4:0.6:1.
  • Example 5 A solid electrolyte powder was obtained by carrying out the same process as in Experimental Example 1, except that LiF powder, LiCl powder and GaF3 powder were used and weighed so that the molar ratio of LiF:LiCl: GaF3 was 2:1:1.
  • Example 6 In addition to the LiF powder, LiCl powder and GaF3 powder, commercially available ZrF4 powder was prepared and weighed out so that the molar ratio of LiF:LiCl: GaF3 : ZrF4 was 2.2:0.6:0.8:0.2. A solid electrolyte powder was obtained by the same process as in Experimental Example 1.
  • Example 7 In addition to the LiF powder, LiCl powder and GaF3 powder, commercially available AlF3 powder was prepared and weighed out so that the molar ratio of LiF:LiCl: GaF3 : AlF3 was 2.4:0.6:0.8:0.2. A solid electrolyte powder was obtained by the same process as in Experimental Example 1.
  • Example 8 A solid electrolyte powder was obtained by carrying out the same process as in Experimental Example 1, except that LiF powder, LiCl powder, GaF3 powder and AlF3 powder were used and weighed so that the molar ratio of LiF:LiCl: GaF3 : AlF3 was 2.4:0.6:0.5:0.5.
  • Example 9 A solid electrolyte powder was obtained by carrying out the same process as in Experimental Example 1, except that LiF powder, LiCl powder, GaF3 powder and AlF3 powder were used and weighed so that the molar ratio of LiF:LiCl: GaF3 : AlF3 was 2.4:0.6:0.3:0.7.
  • X-ray diffraction measurement> The solid electrolyte powder and the Si powder as an internal standard sample were mixed and an X-ray diffraction pattern was obtained by an X-ray diffraction (XRD) device to identify the crystal phase.
  • the measurement conditions were CuK ⁇ , 40 kV, and 40 mA, and a sealed tube type X-ray diffraction device (D8-ADVANCE manufactured by Bruker AXS Co., Ltd.) was used.
  • the measurement step width was 0.02°.
  • the area intensity of each peak in the X-ray diffraction pattern was calculated by performing profile fitting using the XRD analysis software "JADE" (MDI Co., Ltd.).
  • the content of the monoclinic phase in the X-ray diffraction pattern was calculated by the RIR method (reference intensity ratio method) using the XRD analysis software "EVA" (manufactured by Bruker AXS Co., Ltd.).
  • FIG. 2 is a diagram showing the X-ray diffraction patterns of the solid electrolyte powders of Experimental Examples 1, 3, and 4.
  • the top, second, and third rows of FIG. 2 show the X-ray diffraction patterns of the solid electrolyte powders of Experimental Examples 1, 3, and 4, respectively.
  • the fourth row is a peak indicated by card number 087-0588 (monoclinic phase of Li 3 GaF 6 ) of the powder diffraction database ICDD (International Centre for Diffraction Data), and the bottom row is a peak indicated by card number 020-0421 (unknown phase of Li 3 GaF 6 ).
  • the unknown phase is a phase whose structure is not specified.
  • the peaks marked "Si" are peaks due to the Si powder, which is an internal standard sample.
  • the X-ray diffraction patterns of the solid electrolyte powders of Experimental Examples 1 to 9 included a peak detected at approximately the same position (diffraction angle 2 ⁇ ) as the peak indicated by card number: 087-0588.
  • the solid electrolyte powder of Experimental Example 1 includes a monoclinic phase of Li 3 GaF 6 , which is a fluorine compound
  • the solid electrolyte powders of Experimental Examples 2 to 5 include a monoclinic phase of a compound in which some F in Li 3 GaF 6 is replaced with Cl.
  • the solid electrolyte powder of Experimental Example 6 includes a monoclinic phase of a compound in which some Ga in Li 3 GaF 6 is replaced with Zr and some F is replaced with Cl.
  • the solid electrolyte powders of Experimental Examples 7 to 9 include a monoclinic phase of a compound in which some Ga in Li 3 GaF 6 is replaced with Al and some F is replaced with Cl.
  • M is an element other than Ga
  • card information of the monoclinic phase of a compound containing the element, Li, and F is appropriately used.
  • each solid electrolyte powder contained the monoclinic phase of the compound as the main phase.
  • the monoclinic phase of the compound in the range of diffraction angle 2 ⁇ of 10 to 50° in the X-ray diffraction pattern, if the sum of the area intensities of all peaks belonging to the monoclinic phase of the compound (compound containing Li, M and F) is greater than the sum of the area intensities of all remaining peaks not belonging to the monoclinic phase, the monoclinic phase of the compound is considered to be the main phase.
  • the peaks belonging to the monoclinic phase of the compound are located at approximately the same position as the peaks indicated by card number: 087-0588 (monoclinic phase of Li 3 GaF 6 ). In other words, the peaks not belonging to the monoclinic phase are located at a different position from the peaks indicated by card number: 087-0588.
  • the content (mass%) of the monoclinic phase was calculated using the RIR method in the X-ray diffraction pattern of each solid electrolyte powder.
  • the monoclinic phase is shown by card number: 087-0588.
  • the crystal phase that does not belong to the monoclinic phase is the unknown phase shown by card number: 020-0421.
  • the content of the monoclinic phase is calculated by (Vm/(Vm+Vu)).
  • the RIR value is a reference intensity ratio (sometimes written as I/Ic), and the value described in the ICDD card information was used to calculate the content. For example, in the case of card number: 087-0588, the RIR value is 1.77.
  • the X-ray diffraction column shows the content of monoclinic phase calculated using the RIR method.
  • the peaks near 26° and 34° are included in the peaks that are characteristically detected in the unknown phase of Li 3 GaF 6 of card number 020-0421, but are not included in the peaks shown by card number 087-0588 (monoclinic phase of Li 3 GaF 6 ). Therefore, due to the reduction in the peaks near 26° and 34°, it is considered that the unknown phase is reduced and the content of the monoclinic phase is improved in the crystal structure.
  • the content of the monoclinic phase quantified by the RIR method is 65% or more, that is, it is presumed that high ionic conductivity can be obtained due to the high content of the monoclinic phase.
  • the solid electrolyte contains a monoclinic phase of a compound containing Li, M (wherein M is a metal element or a metalloid element other than Li), and F as a main phase.
  • the content of the monoclinic phase quantified by the RIR method is 65% or more. This makes it possible to provide a solid electrolyte having a high content of the monoclinic phase and high lithium ion conductivity by reducing the unknown phase in the solid electrolyte.
  • the content of the monoclinic phase is preferably 68% or more, more preferably 70% or more.
  • the solid electrolyte does not contain sulfides and does not generate hydrogen sulfide gas, so it is safe.
  • M contains Ga, as in Experimental Examples 2 to 9. This makes it possible to more reliably improve lithium ion conductivity.
  • the compound further contains X, which is at least one element selected from the group consisting of Cl, Br, and I.
  • X is at least one element selected from the group consisting of Cl, Br, and I.
  • the compound has the formula: Li 3 MF 6-a X a ... (1) and 0 ⁇ a ⁇ 6 is satisfied.
  • solid electrolytes include compounds in which M is a trivalent cation, M ⁇ , and M ⁇ is a tetravalent cation. Also, compounds having the formula: Li 3-b M ⁇ 1-b M ⁇ b F 6-a X a ... (2) where 0 ⁇ a ⁇ 6 and 0 ⁇ b ⁇ 1 are satisfied. This makes it possible to suitably realize a solid electrolyte having high lithium ion conductivity, as in Experimental Example 6.
  • the solid electrolyte may not contain X as long as the content of the monoclinic phase is 65% or more.
  • the compound contained in the solid electrolyte may be represented by a formula other than the above formulas (1) and (2).
  • the present solid electrolyte may be mixed with other substances (which may include Li) and used as an electrolyte material.
  • the present solid electrolyte is preferably the component with the largest mass ratio among the components contained in the electrolyte material, i.e., the main component.
  • the mass ratio of the main component in the electrolyte material is preferably 50 mass% or more, more preferably 60 mass% or more, and even more preferably 70 mass% or more.
  • the present solid electrolyte used in the all-solid-state secondary battery 1 does not necessarily need to be contained in all of the positive electrode 11, the negative electrode 12, and the electrolyte layer 13, but may be contained in at least one of the positive electrode 11, the negative electrode 12, and the electrolyte layer 13.
  • the present solid electrolyte may be used in batteries other than all-solid-state secondary batteries, and may be used for purposes other than batteries.

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PCT/JP2022/042226 2022-11-14 2022-11-14 固体電解質およびリチウムイオン電池 Ceased WO2024105730A1 (ja)

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