Sulphide based lithium-ion conducting solid electrolyte and methods for the production thereof
AssigneeUmicore AG & Co. KG
InventorsAntoine BREHAULT, Pol BRIANTAIS, Yann GUIMOND, Tom KREKELS
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Abstract
The present invention relates to solid materials which are obtainable by melt-quenching mixtures of lithium sulphide, boron sulphide and boron oxide, thereby forming a glassy solid which is suitable for use as a lithium-ion conducting electrolyte. These sulphide based lithium-ion conducting solid electrolytes exhibit a large thermal stability as supported by the large ΔTx, in particular a ΔTx of more than 100° C.
Claims12
1-11. (canceled)
A solid material, which is obtainable by melt-quenching a mixture of the following precursors:
- Li2S;
- B2S3 and/or both of boron and sulfur;
- and
- B2O3;
- wherein the molar ratio of the precursors in the mixture before quenching is such that a composition according to general formula (II) is obtained
- xLi2S-yB2S3-zB2O3 (II)
- wherein
- x is within the range of 62 to 68;
- y is within the range of 27 to 33;
- z is within the range of 1 to 9;
- and
- x+y+z=100.
A method for preparing a solid material, comprising the steps of:
- (i) providing the following precursors:
- Li2S;
- B2S3 and/or both of boron and sulfur;
- and
- B2O3;
- and
- (ii) preparing a mixture comprising the precursors provided in step (i) wherein in said mixture the molar ratio of the precursors is such that a composition according to general formula (II) is obtained
- xLi2S-yB2S3-zB2O3 (II)
- wherein
- x is within the range of 62 to 68;
- y is within the range of 27 to 33;
- z is within the range of 1 to 9;
- and
- x+y+z=100;
- (iii) heat-treating the mixture prepared in step (ii) to obtain a melt;
- and
- (iv) quenching the melt obtained in step (iii) to obtain the solid material.
Dependencies are inferred from the claim text.