| CPC H01M 10/0562 (2013.01) [H01M 10/0525 (2013.01); H01M 2300/0068 (2013.01)] | 4 Claims |

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1. A sulfide-based solid electrolyte having an argyrodite-type structure, wherein a composition of the sulfide-based solid electrolyte is represented by the formula:
Li8GeS5-xTe1+x
in which: −0.5≤x<0, 0<x≤0.375.
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