The invention relates to lithium argyrodite of the general formula (I): Li+ (12-n-x)Bn+ X2- 6-x Y- x (I), where Bn+ is selected from the group P, As, Ge, Ga, Sb, Si, Sn, Al, In, Ti, V, Nb, and Ta, X2 - is selected from the group S, Se, and Te, Y- is selected from the group Cl, Br, I, F, CN, OCN, SCN...
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