NEW SOLID SULFIDE ELECTROLYTES

1 . A solid material according to general formula (I) as follows:

wherein:

X is selected from the group consisting of F, Cl, I and Br;

0.005 ≤ x ≤ 5; and

0 ≤ y ≤ 0.5..

2 . The solid material according to claim 1 wherein X is Cl.

3 . The solid material according to claim 1 wherein 0.02 ≤ x ≤ 0.8.

4 . The solid material according to claim 1

wherein the crystallization degree of the solid material is from 80% to 100%.

5 . The solid material according to claim 1

wherein the solid material comprises at least peaks at position of: 15.65°+/- 0.5°, 25.53°+/-0.5°, 30.16°+/- 0.5°, and 31.52°+/- 0.5° (2θ) when analyzed by x-ray diffraction using CuKα radiation at 25° C.

6 . The solid material according to claim 1

wherein it is in powder form with a distribution of particle diameters having a D50 between 0.05 µm and 10 µm.

7 . A method for producing the solid material according to claim 1 comprising at least bringing at least lithium sulfide, phosphorous sulfide, halogen compound and a copper compound, optionally in one or more solvents.

8 . A process for the preparation of a solid material according to claim 1 comprising at least the process steps of:

a) obtaining a composition by admixing stoichiometric amounts of lithium sulfide,

phosphorous sulfide, halogen compound and a copper compound, optionally in one or more solvents, under an inert atmosphere;

b) applying a mechanical treatment to the composition obtained in step a);

c) optionally removing at least a portion of the one or more solvents from the composition obtained on step b), so that to obtain a solid residue;

d) heating the obtained residue obtained in step c) at a temperature in the range of from 100° C. to 700° C., under an inert atmosphere, thereby forming the solid material; and

e) optionally treating the solid material obtained in step d) to the desired particle size distribution.

9 . The process according to claim 8 wherein the copper compound is selected from the group consisting of CuS, Cu 2 S, Cu 2-x S (wherein x is between 0 and 1 and CuCl 2 .

10 . The process according to claim 8 wherein the lithium sulfide is Li 2 S, the phosphorous sulfide is P 2 S 5 , the halogen compound is LiCl, and the copper compound is Cu 2 S.

11 . The process according to claim 8 wherein the solvent is selected in the group consisting of alkanols; carbonates; acetates; ethers; organic nitriles; aliphatic hydrocarbons; and aromatic hydrocarbons.

12 . The process according to claim 8

wherein in step b) the mechanical treatment is performed by wet or dry milling.

13 . (canceled)

14 . A process for the preparation of a solid material according to claim 1 , said process comprising at least the process steps of:

a′) obtaining a solution by admixing stoichiometric amounts of lithium compounds, sulfide compounds, phosphorous compounds, halogen compound and a copper compound, in one or more solvents, under an inert atmosphere;

b′) removing at least a portion of the one or more solvents from the composition as obtained in step a′), so that to obtain a solid material;

c′) optionally heating the solid material as obtained in step b′), at a temperature in the range of from 100° C. to 700° C., under an inert atmosphere; and

d′) optionally treating the solid material obtained in step c′) to the desired particle size distribution.

15 . (canceled)

16 . (canceled)

17 . A solid electrolyte comprising at least a solid material of formula (I) as follows:

wherein:

X is selected from the group consisting of F, Cl, I and Br;

0.005 ≤ x ≤ 5; and

0 ≤ y ≤ 0.5..

18 . An electrochemical device comprising at least the solid electrolyte of claim 17 .

19 . A solid state battery comprising at least the solid electrolyte of claim 17 .

20 . A vehicle comprising at least a solid state battery comprising at least the solid electrolyte of claim 17 .

21 . An electrode comprising at least:

a metal substrate;

directly adhered onto said metal substrate, at least one layer made of a composition comprising:

(i) a solid material of formula (I) as follows:

wherein:

X is selected from the group consisting of F, Cl, I and Br;

0.005 ≤ x ≤ 5; and

0 ≤ y ≤ 0.5;

(ii) at least one electro-active compound (EAC);

(iii) optionally at least one lithium ion-conducting material (LiCM) other than the solid material of formula (I);

(iv) optionally at least one electro-conductive material (ECM);

(v) optionally a lithium salt (LIS);

(vi) optionally at least one polymeric binding material (P).

22 . A separator comprising at least:

the solid material of claim 1

optionally at least one polymeric binding material (P);

optionally at least one metal salt, notably a lithium salt;

optionally at least one plasticizer.