JPWO2019135342A1 - 固体電解質材料、および、電池 - Google Patents
固体電解質材料、および、電池 Download PDFInfo
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- JPWO2019135342A1 JPWO2019135342A1 JP2019563952A JP2019563952A JPWO2019135342A1 JP WO2019135342 A1 JPWO2019135342 A1 JP WO2019135342A1 JP 2019563952 A JP2019563952 A JP 2019563952A JP 2019563952 A JP2019563952 A JP 2019563952A JP WO2019135342 A1 JPWO2019135342 A1 JP WO2019135342A1
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- Prior art keywords
- solid electrolyte
- electrolyte material
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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
- H01M10/052—Li-accumulators
-
- 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
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/02—Amorphous compounds
-
- 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
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- 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
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications
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- 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
- C01P2002/77—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by unit-cell parameters, atom positions or structure diagrams
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
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Abstract
Description
Li3Y1Br6・・・式(1)
実施の形態1における固体電解質材料は、第1結晶相を含む、固体電解質材料である。
Li3Y1Br6・・・式(1)
Li3−3δY1+δBr6・・・式(2)
ここで、0<δ≦0.25、である。
実施の形態1における固体電解質材料は、例えば、下記の方法により、製造されうる。
以下、実施の形態2が説明される。上述の実施の形態1と重複する説明は、適宜、省略される。
[固体電解質材料の作製]
露点−60℃以下のアルゴン雰囲気で、原料粉LiBrとYBr3とを、モル比でLiBr:YBr3=2.7:1.1となるように、秤量した。これらを乳鉢で粉砕して混合した。その後、遊星型ボールミルを用い、25時間、600rpmでミリング処理した。さらに、焼成炉で、Ar(アルゴン)雰囲気下、400℃で、48時間焼成処理を行った。
図3は、イオン伝導度の評価方法を示す模式図である。
図4は、固体電解質のイオン伝導度の温度依存性を示すグラフである。
図5は、XRDパターンを示すグラフである。
アルゴングローブボックス内で、実施例1の固体電解質材料と、活物質であるLiCoO2を、70:30の体積比率で秤量した。これらをメノウ乳鉢で混合することで、合剤を作製した。
図6は、初期放電特性を示すグラフである。
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=2.55:1.15のモル比で混合した。
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=2.97:1.01のモル比で混合した。
(xLi,Total/xY,Total)(1+δ)=xLiBr/xLEB+(3−3δ)・・・式(A1)
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=2.85:1.05のモル比で混合した。
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=3:1のモル比で混合した。
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=3.3:0.9のモル比で混合した。
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=3.6:0.8のモル比で混合した。
固体電解質の原料粉として、LiBrとYBr3とを用いて、LiBr:YBr3=2.25:1.25のモル比で混合した。
露点−30℃以下のドライ雰囲気で、原料粉LiBrとInBr3とを、モル比でLiBr:InBr3=3:1となるように、秤量した。これらを乳鉢で粉砕して混合した。その後、ペレット状に加圧成形した試料を、ガラス管中に真空封入を行い、200℃で1週間焼成を行った。
固体電解質の原料粉として、LiClとFeCl2とを用い、LiCl:FeCl2=2:1のモル比で混合した。これにより、比較例2の固体電解質材料であるLi2FeCl4を得た。
実施例1から8と比較例1、2とを比較すると、Li:Yモル比が3未満であるLi3−3δY1+δBr6の結晶相を含む固体電解質材料であれば、室温近傍において、1×10−4S/cm以上の高いイオン伝導性を示すことがわかる。また、−30℃から80℃の範囲において、相転移をしないことがわかる。すなわち、実施例1から8は、電池の想定動作温度域において、構造が安定であることがわかる。
201 正極
202 電解質層
203 負極
204 正極活物質粒子
205 負極活物質粒子
300 加圧成形用ダイス
301 枠型
302 パンチ下部
303 パンチ上部
1000 電池
Claims (11)
- 第1結晶相を含み、
前記第1結晶相の組成は、下記の組成式(1)により表される組成に比べて、Liが欠損している、
Li3Y1Br6・・・式(1)
固体電解質材料。 - 前記第1結晶相は、下記の組成式(2)により表され、
Li3−3δY1+δBr6・・・式(2)
ここで、0<δ≦0.25、である、
請求項1に記載の固体電解質材料。 - 0.032≦δ≦0.22、である、
請求項2に記載の固体電解質材料。 - Cu−Kα線をX線源として用いることにより得られた、前記固体電解質材料のX線回折パターンは、回折角2θの値が26.8°以上27.9°以下である第1範囲内、前記回折角2θの値が31.1°以上32.4°以下である第2範囲内、及び前記回折角2θの値が44.4°以上46.3°以下である第3範囲内の各々において、ピークを含む、
請求項1から3のいずれかに記載の固体電解質材料。 - 前記X線回折パターンは、さらに、前記回折角2θの値が13.4°以上14.0°以下である第4範囲内に、ピークを含む、
請求項4に記載の固体電解質材料。 - 前記X線回折パターンにおいて、前記第2範囲内に含まれる前記ピークの半値幅FWHMと、前記ピークの中心値2θpとが、
FWHM/2θp≦0.01、を満たす、
請求項4または5に記載の固体電解質材料。 - 前記第1結晶相は、臭素の副格子を含み、
前記副格子における臭素の配列は、立方最密充填構造が歪んだ原子配列を含む、
請求項1から6のいずれかに記載の固体電解質材料。 - 前記第1結晶相は、Li3ErBr6構造と同様の原子配列を含む、
請求項1から7のいずれかに記載の固体電解質材料。 - Cu−Kα線をX線源として用いることにより得られた、前記固体電解質材料のX線回折パターンは、回折角2θの値が27.7°以上28.4°以下である範囲内、前記回折角2θの値が32.1°以上32.8°以下である範囲内、及び前記回折角2θの値が46.1°以上47.1°以下である範囲内からなる群から選択される少なくとも1つにおいて、ピークを含む、
請求項1から8のいずれかに記載の固体電解質材料。 - 第2結晶相をさらに含み、
前記第2結晶相の母構造は、LiBrである、
請求項9に記載の固体電解質材料。 - 請求項1から10のいずれかに記載の固体電解質材料と、
正極と、
負極と、
前記正極と前記負極との間に設けられる電解質層と、
を備え、
前記正極、前記負極、及び前記電解質層からなる群から選択される少なくとも1つは、前記固体電解質材料を含む、
電池。
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