Solid electrolyte material and all solid-state lithium secondary battery
First Claim
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1. A solid electrolyte material for an all solid-state lithium secondary battery represented by Li2S-MIaSb-MIIxOy,wherein:
- MI is selected from P, Si, Ge, B and Al;
“
a” and
“
b”
respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MI;
MII, “
x,” and
“
y”
are selected such that MIIxOy is Bi2O3;
MIIxOy is less stable than MIIxSy;
the Li2S-MIaSb-MIIxOy has a composition in which the ratio of MIIxOy to the total of Li2S and MIaSb is 60;
40 to 95;
5 (mole ratio); and
said solid electrolyte material is;
(i) used for the all solid-state lithium secondary battery comprising a positive electrode, a solid electrolyte layer, and a negative electrode;
(ii) contained in any of the positive electrode, the solid electrolyte layer, and the negative electrode; and
(iii) capable of suppressing generation of hydrogen sulfide.
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Abstract
A solid electrolyte material for an all solid-state lithium secondary battery represented by Li2S-MIaSb-MIIxOy, wherein MI is selected from P, Si, Ge, B and Al; “a” and “b” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MI; MII is selected from Fe, Zn and Bi; and “x” and “y” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MII.
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Citations
13 Claims
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1. A solid electrolyte material for an all solid-state lithium secondary battery represented by Li2S-MIaSb-MIIxOy,
wherein: -
MI is selected from P, Si, Ge, B and Al; “
a” and
“
b”
respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MI;MII, “
x,” and
“
y”
are selected such that MIIxOy is Bi2O3;MIIxOy is less stable than MIIxSy; the Li2S-MIaSb-MIIxOy has a composition in which the ratio of MIIxOy to the total of Li2S and MIaSb is 60;
40 to 95;
5 (mole ratio); andsaid solid electrolyte material is; (i) used for the all solid-state lithium secondary battery comprising a positive electrode, a solid electrolyte layer, and a negative electrode; (ii) contained in any of the positive electrode, the solid electrolyte layer, and the negative electrode; and (iii) capable of suppressing generation of hydrogen sulfide. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A solid electrolyte material for an all solid-state lithium secondary battery represented by Li2S-MIaSb-MIIxOy,
wherein MI is selected from P, Si, Ge, B and Al; -
“
a” and
“
b”
respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MI;MII is selected from Fe, Zn, and Bi; “
x” and
“
y”
respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MII; andthe Li2S-MIaSb-MIIxOy has a composition in which the ratio of MIIxOy to the total of Li2S and MIaSb is 60;
40 to 95;
5 (mole ratio). - View Dependent Claims (9, 10, 11, 12, 13)
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8. An all solid-state lithium secondary battery, comprising:
-
a positive electrode; a negative electrode; a solid electrolyte layer interposed between the positive electrode and the negative electrode; and a solid electrolyte material contained in the solid electrolyte layer and throughout at least one of the positive electrode and the negative electrode, wherein; the solid electrolyte material is represented by Li2S-MIaSb-MIIxOy, in which; MI is selected from P, Si, Ge, B and Al; “
a” and
“
b”
respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MI;MII is selected from Fe, Zn, and Bi; and “
x” and
“
y”
respectively represent numbers that give a stoichiometric ratio in accordance with the kind of MII; andthe Li2S-MIaSb-MIIxOy has a composition in which the ratio of MIIxOy to the total of Li2S and MIaSb is 60;
40 to 95;
5 (mole ratio).
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Specification