WO2005040039A1 - 硫化リチウムの精製方法 - Google Patents
硫化リチウムの精製方法 Download PDFInfo
- Publication number
- WO2005040039A1 WO2005040039A1 PCT/JP2004/015231 JP2004015231W WO2005040039A1 WO 2005040039 A1 WO2005040039 A1 WO 2005040039A1 JP 2004015231 W JP2004015231 W JP 2004015231W WO 2005040039 A1 WO2005040039 A1 WO 2005040039A1
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- WIPO (PCT)
- Prior art keywords
- lithium
- lithium sulfide
- sulfide
- organic solvent
- washing
- Prior art date
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- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 50
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims abstract description 33
- 239000003960 organic solvent Substances 0.000 claims abstract description 30
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 57
- 238000005406 washing Methods 0.000 claims description 23
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 22
- 229910052744 lithium Inorganic materials 0.000 claims description 22
- 239000007784 solid electrolyte Substances 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 9
- 238000000746 purification Methods 0.000 claims description 6
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 5
- 239000002798 polar solvent Substances 0.000 claims description 2
- CEYHMDZZVMDKDG-UHFFFAOYSA-M CNNC(C(=O)[O-])CC.[Li+] Chemical compound CNNC(C(=O)[O-])CC.[Li+] CEYHMDZZVMDKDG-UHFFFAOYSA-M 0.000 claims 1
- 150000002500 ions Chemical class 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 21
- 238000004140 cleaning Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000009835 boiling Methods 0.000 description 6
- BBLSYMNDKUHQAG-UHFFFAOYSA-L dilithium;sulfite Chemical compound [Li+].[Li+].[O-]S([O-])=O BBLSYMNDKUHQAG-UHFFFAOYSA-L 0.000 description 6
- 230000007774 longterm Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- -1 urea compound Chemical class 0.000 description 6
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 5
- YGLBXEHGQGOHPL-UHFFFAOYSA-M lithium;2-(methylamino)butanoate Chemical compound [Li+].CCC(NC)C([O-])=O YGLBXEHGQGOHPL-UHFFFAOYSA-M 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 150000002894 organic compounds Chemical class 0.000 description 4
- XUWHAWMETYGRKB-UHFFFAOYSA-N piperidin-2-one Chemical compound O=C1CCCCN1 XUWHAWMETYGRKB-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 239000003495 polar organic solvent Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010908 decantation Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- GMKDNCQTOAHUQG-UHFFFAOYSA-L dilithium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [Li+].[Li+].[O-]S([O-])(=O)=S GMKDNCQTOAHUQG-UHFFFAOYSA-L 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 2
- BCNBMSZKALBQEF-UHFFFAOYSA-N 1,3-dimethylpyrrolidin-2-one Chemical compound CC1CCN(C)C1=O BCNBMSZKALBQEF-UHFFFAOYSA-N 0.000 description 1
- IVUYGANTXQVDDG-UHFFFAOYSA-N 1-(2-methylpropyl)pyrrolidin-2-one Chemical compound CC(C)CN1CCCC1=O IVUYGANTXQVDDG-UHFFFAOYSA-N 0.000 description 1
- ZFPGARUNNKGOBB-UHFFFAOYSA-N 1-Ethyl-2-pyrrolidinone Chemical compound CCN1CCCC1=O ZFPGARUNNKGOBB-UHFFFAOYSA-N 0.000 description 1
- IVVVGBHWWAJRAY-UHFFFAOYSA-N 1-ethyl-3-methylpyrrolidin-2-one Chemical compound CCN1CCC(C)C1=O IVVVGBHWWAJRAY-UHFFFAOYSA-N 0.000 description 1
- GHELJWBGTIKZQW-UHFFFAOYSA-N 1-propan-2-ylpyrrolidin-2-one Chemical compound CC(C)N1CCCC1=O GHELJWBGTIKZQW-UHFFFAOYSA-N 0.000 description 1
- DCALJVULAGICIX-UHFFFAOYSA-N 1-propylpyrrolidin-2-one Chemical compound CCCN1CCCC1=O DCALJVULAGICIX-UHFFFAOYSA-N 0.000 description 1
- XXUXXCZCUGIGPP-ACAGNQJTSA-N 2-Hydroxy-3,5-dinitro-N-[(1Z)-(5-nitrofuran-2-yl)methylidene]benzene-1-carbohydrazonic acid Chemical compound C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C(O)=C1C(=O)N\N=C/C1=CC=C([N+]([O-])=O)O1 XXUXXCZCUGIGPP-ACAGNQJTSA-N 0.000 description 1
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 1
- UQNMSPXXLYIJCU-UHFFFAOYSA-N COC(CCC)=O.[Li] Chemical compound COC(CCC)=O.[Li] UQNMSPXXLYIJCU-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000010 aprotic solvent Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- IKJFYINYNJYDTA-UHFFFAOYSA-N dibenzothiophene sulfone Chemical compound C1=CC=C2S(=O)(=O)C3=CC=CC=C3C2=C1 IKJFYINYNJYDTA-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- MAHNFPMIPQKPPI-UHFFFAOYSA-N disulfur Chemical compound S=S MAHNFPMIPQKPPI-UHFFFAOYSA-N 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- FGXWKSZFVQUSTL-UHFFFAOYSA-N domperidone Chemical compound C12=CC=CC=C2NC(=O)N1CCCN(CC1)CCC1N1C2=CC=C(Cl)C=C2NC1=O FGXWKSZFVQUSTL-UHFFFAOYSA-N 0.000 description 1
- 229960001253 domperidone Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- IMNDHOCGZLYMRO-UHFFFAOYSA-N n,n-dimethylbenzamide Chemical compound CN(C)C(=O)C1=CC=CC=C1 IMNDHOCGZLYMRO-UHFFFAOYSA-N 0.000 description 1
- PZYDAVFRVJXFHS-UHFFFAOYSA-N n-cyclohexyl-2-pyrrolidone Chemical compound O=C1CCCN1C1CCCCC1 PZYDAVFRVJXFHS-UHFFFAOYSA-N 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Classifications
-
- 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
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/06—Sulfates; Sulfites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/22—Alkali metal sulfides or polysulfides
- C01B17/36—Purification
-
- 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
-
- 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
- C01P2006/80—Compositional purity
-
- 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
-
- 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 method for purifying lithium sulfide, which efficiently removes impurities such as sulfur oxides and lithium N-methylaminobutyrate (hereinafter referred to as LMAB) from lithium sulfide used for electronic and electrical materials. . Further, the present invention relates to a solid electrolyte for a lithium secondary battery comprising lithium sulfide purified by the purification method, and a solid battery using the same.
- LMAB lithium N-methylaminobutyrate
- a secondary battery is a battery that can be charged and discharged. Since secondary batteries are used while being repeatedly charged and discharged over a long period of time, the members used for them are required to have long-term stability and durability.
- the applicant of the present application has found a method for producing lithium sulfate by which high-purity lithium sulfide can be obtained by simple means (Japanese Patent Laid-Open No. 7-330312). According to this method, lithium sulfide is produced in an aprotic organic solvent such as N-methyl-2-pyrrolidone (hereinafter, referred to as NMP). Is simple and convenient. However, the resulting lithium sulfide contains LMAB, an impurity derived from NMP.
- NMP N-methyl-2-pyrrolidone
- Japanese Patent Application Laid-Open No. 9-283156 discloses a method for producing lithium sulfide by reacting lithium hydroxide with a gaseous sulfur source at a temperature of 130 ° C. or more and 445 ° C. or less. Lithium sulfide produced by this method is mixed with sulfur oxides produced during the production process (eg, lithium sulfite, lithium sulfate, lithium thiosulfate, etc.).
- an object of the present invention is to provide a method for purifying lithium sulfide, which reduces impurities contained in lithium sulfide, which is a raw material of a solid electrolyte for a lithium secondary battery.
- the present inventors have conducted intensive studies, and obtained lithium sulfide produced by the method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-330321, such as NMP or the like at 100 ° C or higher.
- the present inventors have found that impurities can be efficiently removed by washing with an organic solvent having a boiling point at a temperature of 100 ° C. or higher, thereby completing the present invention.
- the first embodiment of the present invention relates to a method in which lithium sulfide obtained by reacting lithium hydroxide and hydrogen sulfide in an aprotic organic solvent is treated with an organic solvent at a temperature of 100 ° C or higher. And a method for purifying lithium sulfide, wherein the method comprises the steps of:
- a second aspect of the present invention provides a solid electrolyte for a lithium secondary battery using lithium sulfide purified by the method of the first aspect.
- a third aspect of the present invention provides a solid-state battery using the solid electrolyte for a lithium secondary battery according to the second aspect.
- the present invention it is possible to economically obtain high-purity lithium sulfide having a sulfur oxide content of 0.15% by mass or less and an LMAB content of 0.1% by mass or less. it can.
- the obtained solid electrolyte for lithium secondary batteries using high-purity lithium sulfide provides a lithium secondary battery (solid state battery) that is suppressed from deterioration due to impurities and has excellent long-term stability. Obtainable.
- the method for purifying lithium sulfide according to the first aspect of the present invention is a method for producing lithium sulfide obtained by reacting lithium hydroxide with hydrogen chloride in an aprotic organic solvent.
- the method is characterized in that the drum is washed with an organic solvent at a temperature of 100 ° C. or higher.
- the lithium sulfide purified in the method of the present invention has been produced by the method for producing lithium sulfide described in JP-A-7-330312. More specifically, the production method described in Japanese Patent Application Laid-Open No. 7-330312 discloses a method in which lithium hydroxide and sulfur dioxide are mixed at 0 to 150 ° C. while blowing sulfur dioxide into an aprotic organic solvent.
- the reaction solution is dehydrosulfided without blowing hydrogen sulfide to produce lithium sulfide, or 150-200 ° C
- lithium hydroxide and hydrogen sulfide are reacted in an aprotic organic solvent to directly produce lithium sulfide.
- the aprotic organic solvent used in the production of lithium sulfide generally includes a non-protonic polar organic compound (for example, an amidite compound, a ratatam compound, a urea compound, an organic compound, a cyclic organic phosphorus compound). And the like) can be suitably used as a single solvent or as a mixed solvent.
- a non-protonic polar organic compound for example, an amidite compound, a ratatam compound, a urea compound, an organic compound, a cyclic organic phosphorus compound.
- N-methyl-2-pyrrolidone preferred are N-methyl-2-pyrrolidone, N-alkylproprolatatam and N-alkylpyrrolidone, and particularly preferred is N-methyl-2-pyrrolidone. is there.
- lithium hydroxide which is a raw material for producing lithium sulfide
- commercially available products can be used as long as the purity is not particularly limited.
- the other raw material sulfuride hydrogen.
- the reaction conditions for the production of lithium sulfide, the ratio of the use of the raw materials, and the like are as described in JP-A-7-330312.
- the method of the present invention is characterized in that the lithium sulfide produced by the method described in JP-A-7-330312 is washed with an organic solvent at a temperature of 100 ° C or higher.
- the reason that the organic solvent is used at a temperature of 100 ° C or higher is that the impurity LMAB generated when the aprotic organic solvent used in the production of lithium sulfide is NMP is solubilized in the organic solvent at a temperature of 100 ° C. It is dakara. This is because LMAB is dissolved in an organic solvent for washing and removed from lithium sulfide.
- the temperature of the organic solvent is 100 ° C. or higher, there is no particular limitation, and the temperature can be appropriately selected.
- the temperature of the organic solvent is below the boiling point, for example, when NMP is used, Under pressure, the boiling point is 203 ° C or less, and under pressure when a closed container or the like is used, it is usually 250 ° C or less.
- the organic solvent used for washing is preferably an aprotic polar solvent.
- the aprotic organic solvent used for producing lithium sulfide and the aprotic solvent used for washing are preferably used. More preferably, the polar organic solvent is the same.
- aprotic polar organic solvent preferably used for washing examples include, for example, non-protonic polar organic compounds such as amide compounds, ratatum compounds, urea compounds, organic sulfur compounds, and cyclic organic phosphorus compounds. It can be suitably used as a single solvent or a mixed solvent.
- examples of the amide compound include N, N-dimethylformamide, N, N-getylformamide, N, N-dimethylacetoamide, N, N-dipropyl Examples include acetoamide and N, N-dimethylbenzoic acid amide.
- ratatam compound examples include, for example, force prolatatam, N-methylcaprolatatam, N-ethylcaprolatatam, N isopropyl force prolatatam, N isobutyl caprolatatam, N normal propyl force prolatatam, N normal butyrol caprolatatam, N— N-alkyl-prolatatams such as cyclohexylcaprolatatam, N-methyl-2-pyrrolidone (NMP), N-ethyl-2-pyrrolidone, N-isopropyl 2-pyrrolidone, N-isobutyl-2-pyrrolidone, N-n-propyl-2-pyrrolidone, N-Normalptyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, N-methyl-3-methyl-2-pyrrolidone, N-ethyl-3-methyl-2-pyrrolidone, N-methyn
- N- methyl-3 Echiru 2-pin Peridon examples include dimethyl sulfoxide, getyl sulfoxide, diphenylene sulfone, 1-methyl-1 year old oxosulfolane, 1-phenyl-1-oxosulfolane, and the like.
- Each of these various aprotic organic compounds may be used alone or in combination of two or more, and further mixed with other solvent components which do not disturb the object of the present invention.
- preferred are N-alkyl-proprotamam and N-alkylpyrrolidone, and particularly preferred. Is N-methyl-2-pyrrolidone (NMP).
- the amount of the organic solvent used for washing is not particularly limited, and the number of times of washing is not particularly limited, but is preferably two or more times.
- the washing is preferably performed under an inert gas such as nitrogen or argon.
- NM is used as an aprotic organic solvent.
- Lithium sulfide is produced using P.
- NMP is added to the obtained crude lithium sulfide, the lithium sulfide is washed at a temperature of 100 ° C or more, and decanted at a temperature of 100 ° C or more under an inert gas such as nitrogen. Perform chilling or filtration. Perform this washing operation at least once.
- the total content of the sulfur oxidized product is 0.15% by mass or less, preferably 0% by mass or less.
- the total content of the sulfur acid oxidant and the content of lithium N-methylaminobutyrate (LMAB) become smaller as the washing is repeated, and the smaller the content, the more preferable. However, considering the actual manufacturing process, the number of cleanings is expected to be within about 10 times. By repeating washing about 10 times, the total content of sulfur oxides can be reduced to about 0.001% by mass and the content of lithium N-methylaminobutyrate (LMAB) to about 0.0005% by mass It is.
- a solid electrolyte for a lithium secondary battery using lithium sulfide purified by the method of the present invention and a solid battery using the same which are the second and third embodiments of the present invention, will be described.
- I do. [0033] as a starting material a lithium sulfide purified by the method of the present invention, when synthesizing the solid electrolyte, ionic conductivity 1. 0 X 10- 3 sZcm, preferably 1. 1 X 10- 3 sZcm more It has electrical characteristics favorable for use as a solid electrolyte for a lithium secondary battery.
- the lithium sulfide purified by the method of the present invention has reduced impurities that adversely affect the long-term stability of the battery. Further, although the reason is not clear, the purity of the purified impurity is low. It is preferably contained as a solid electrolyte for a lithium secondary battery and has ionic conductivity, and can maintain desired battery performance for a long period of time even after repeated charging and discharging.
- Lithium sulfide was produced by the method of the first embodiment (two-step method) of JP-A-7-330312. Specifically, N-methyl-2-pyrrolidone (NMP) 336.4 g (33.6 mol) and lithium hydroxide 288.7 g (12 mol) were charged into a 10-liter autoclave equipped with stirring blades. The temperature was increased to 300 rpm and 130 ° C. After the temperature was raised, hydrogen was blown into the liquid at a supply rate of 3 liters Z for 2 hours. Subsequently, the temperature of the reaction solution was increased under a nitrogen stream (for 200 ccZ), and a part of the reacted hydrogen sulfide was dehydrosulfided.
- NMP N-methyl-2-pyrrolidone
- Lithium sulfide was produced by the method of the first embodiment (two-step method) of JP-A-7-330312. Specifically, N-methyl-2-pyrrolidone (NMP) 336.4 g (3
- impurities such as lithium sulfite (Li SO), lithium sulfate (Li SO), and thiosulfuric acid were impurities.
- Lithium (Li S O) and lithium N-methylaminobutyrate (LMAB) are examples of lithium N-methylaminobutyrate
- Lithium sulfide was obtained in the same manner as in Example 1, except that the drying under normal pressure at 230 ° C under a nitrogen stream was changed to the drying under reduced pressure at 230 ° C.
- the results of measuring the impurity content in the obtained lithium sulfide are shown in Table 1 below.
- Lithium sulfide was obtained in the same manner as in Example 2, except that the washing with NMP was repeated 10 times.
- the results of measuring the impurity content in the obtained lithium sulfide are shown in Table 1 below.
- Example 1 crude lithium sulfide obtained by decanting NMP in a 500 mL slurry reaction solution (NMP-lithium sulfide slurry) produced in Example 1 (that is, lithium sulfide vigorously without washing with NMP) Table 1 below shows the results of the measurement of the impurity content in).
- Lithium sulfide was obtained in the same manner as in Example 1 except that the washing temperature was changed from 105 ° C. to normal temperature.
- the results of measuring the impurity content in the obtained lithium sulfide are shown in Table 1 below.
- Lithium sulfide was obtained in the same manner as in Example 1, except that the washing solvent was changed to dimethoxyethane (boiling point: 8283 ° C) and the washing temperature was changed to 70 ° C.
- the results of measuring the impurity content in the obtained lithium sulfate are shown in Table 1 below.
- Comparative Example 4 Lithium sulfite; manufactured by Aldrich Chemical Company, Inc.
- Comparative Example 5 Lithium sulfite; manufactured by Furuchi Chemical Co., Ltd.
- Comparative Example 6 Lithium sulfite; manufactured by Kishida Chemical Co., Ltd.
- Comparative Example 2 which was washed at a washing temperature of less than 100 ° C., the contents of lithium sulfite and lithium sulfate were reduced to the same level as in Examples 1 and 2, and lithium thiosulfate and N —The content of lithium methylbutyrate (LMAB) is reduced and reduced.
- LMAB lithium methylbutyrate
- the commercially available lithium sulfide of Comparative Example 416 manufactured by a method different from the method described in JP-A-7-330312 does not originally contain LMAB, but has a structure similar to that of JP-A-7-330312. Compared with lithium sulfide (Comparative Example 1) produced by the method described in It may contain sulfur oxides.
- Example 1 From the results of Example 1 and Comparative Example 2, it can be seen that even when the same solvent is used, the desired cleaning effect cannot be obtained if the cleaning temperature is lower than 100 ° C.
- the lithium sulfide produced by the method described in JP-A-7-330312 is purified.
- impurities such as sulfur sulfide and LMAB, which lower the long-term stability of the lithium secondary battery.
- a solid electrolyte for a lithium secondary battery having excellent long-term stability and a solid battery having excellent battery performance using the same can be provided.
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Abstract
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004800309857A CN1871177B (zh) | 2003-10-23 | 2004-10-15 | 硫化锂的精制方法 |
JP2005514938A JP4896520B2 (ja) | 2003-10-23 | 2004-10-15 | 硫化リチウムの精製方法 |
KR1020067007700A KR101109821B1 (ko) | 2003-10-23 | 2004-10-15 | 황화리튬의 정제 방법 |
EP04792448A EP1681263B1 (en) | 2003-10-23 | 2004-10-15 | Method for purifying lithium sulfide |
US10/576,721 US8084160B2 (en) | 2003-10-23 | 2004-10-15 | Method for purifying lithium sulfide |
AT04792448T ATE513788T1 (de) | 2003-10-23 | 2004-10-15 | Verfahren zur reinigung von lithiumsulfid |
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JP2003363403 | 2003-10-23 | ||
JP2003-363403 | 2003-10-23 |
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WO2005040039A1 true WO2005040039A1 (ja) | 2005-05-06 |
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PCT/JP2004/015231 WO2005040039A1 (ja) | 2003-10-23 | 2004-10-15 | 硫化リチウムの精製方法 |
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US (1) | US8084160B2 (ja) |
EP (1) | EP1681263B1 (ja) |
JP (1) | JP4896520B2 (ja) |
KR (1) | KR101109821B1 (ja) |
CN (2) | CN1871177B (ja) |
AT (1) | ATE513788T1 (ja) |
TW (1) | TW200530121A (ja) |
WO (1) | WO2005040039A1 (ja) |
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- 2004-10-15 US US10/576,721 patent/US8084160B2/en not_active Expired - Fee Related
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- 2004-10-15 WO PCT/JP2004/015231 patent/WO2005040039A1/ja active Application Filing
- 2004-10-15 EP EP04792448A patent/EP1681263B1/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
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KR20060076316A (ko) | 2006-07-04 |
US8084160B2 (en) | 2011-12-27 |
TWI366554B (ja) | 2012-06-21 |
EP1681263A8 (en) | 2006-10-11 |
CN101980398A (zh) | 2011-02-23 |
ATE513788T1 (de) | 2011-07-15 |
KR101109821B1 (ko) | 2012-03-13 |
JP4896520B2 (ja) | 2012-03-14 |
CN1871177B (zh) | 2010-12-22 |
EP1681263A1 (en) | 2006-07-19 |
TW200530121A (en) | 2005-09-16 |
US20070196739A1 (en) | 2007-08-23 |
EP1681263A4 (en) | 2008-06-25 |
CN1871177A (zh) | 2006-11-29 |
JPWO2005040039A1 (ja) | 2007-03-01 |
EP1681263B1 (en) | 2011-06-22 |
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