Processing

Please wait...

Settings

Settings

Goto Application

1. WO2021043493 - SULFIDE-BASED SOLID COMPOSITE ELECTROLYTE FILM

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]


1. A process for manufacturing a free-standing solid composite electrolyte film, comprising the steps of

a) mixing (i) at least one sulfide-based solid ionic conducting inorganic particle and (ii) at least one tetrafluoroethylene (TFE) (co)polymer to form a paste; and

b) calendaring or extruding the paste to produce a film,

wherein the step a) mixing comprises al) homogenizing the mixture of (i) at least one sulfide-based solid ionic conducting inorganic particle and (ii) at least one TFE (co)polymer into powders and a2) blending the powders into a paste.

2. The process according to claim 1, wherein the al) homogenizing is performed at a temperature of 19°C or lower and the a2) blending is performed at a temperature of 30°C or higher.

3. The process according to claim 1 or 2, wherein the step b) calendaring or extruding is performed at a temperature between 30°C and 150°C.

4. The process according to any of claims 1 to 3, optionally adding (iii) at least one lubricant in a2) blending to form a paste.

5. The process according to claim 4, additionally comprising a step of c) drying the film obtained from the step b) to remove the lubricant.

6. The process according to any of claims 1 to 5, further comprising an additional step of d) calendaring.

7. The process according to any of claims 1 to 6, wherein an amount of the (ii) at least one TFE (co)polymer is from 1.0 to 20.0 wt%, preferably from 2.0 to 15.0 wt% and more preferably from 3.0 to 10.0 wt%, based on the total weight of the mixture.

8. The process according to any of claims 1 to 7, wherein the (ii) at least one TFE (co)polymer is TFE homopolymer, TFE copolymer comprising recurring units derived from at least one per(halo)fluoroolefm different from TFE monomer, in an amount of from 0.01 to 0.25 % moles, preferably from 0.05 to 0.175 % moles, with respect to the total moles of the recurring units of the TFE copolymer, or blends thereof.

9. The process according to claim 8, wherein the at least one per(halo)fluoroolefm different from TFE monomer is hexafluoropropylene.

10. The process according to any of claims 1 to 9, wherein the (i) at least one sulfide-based solid ionic conducting inorganic particle comprises crystalline, glass-ceramic and glassed L13PS4, L PsSn, L17PS6, L19.6P3S12, L14P2S6 and other glasses in the system of L12S-P2S5, Argyrodite-type L16PS5X (X = Cl, Br, or I), (LhS)x-(P2S5)y, wherein LiioSiP2Si2, Lio.8Sno.8S2, Li2S-SiS2-P2S5, Li2S-SiS

Li9.54Si1.74P 1.44S11.7CI0.3, doped Li-P-S, doped Li-P-S-X, L12CUPS4, Lii+2xZni-xPS4, wherein 0<x<l, Li3.33Mgo.33P2S6, Li4-3xScxP2S6, wherein 0<x<l, LhS-GeS2-ZnS, Li2S-SiS2-AhS3, Li3SbS4, Ge- substituted L13ASS4,

Li3.833Sno.833 Aso.166 S4, L13ASS4- Li4SnS4, Na3PS4, NaioSnPoSo, NanSn2PSi2, oxysulfides thereof, and blends thereof.

11. The process according to any of claims 4 to 10, wherein the (iii) at least one lubricant is selected from the group consisting of isoparaffmic hydrocarbon compounds and petroleum fractions.

12. The process according to any of claims 4 to 11, wherein an amount of (iii) at least one lubricant is from 5.0 to 35.0 parts by weight (pbw), preferably from 10.0 to 30.0 pbw and more preferably from 15.0 to 25.0 pbw, with respect to the total weight of the mixture of (i) at least one sulfide-based solid ionic conducting inorganic particle, (ii) at least one TFE (co)polymer and (iii) at least one lubricant.

13. A free-standing solid composite electrolyte film comprising

(i) at least one sulfide-based solid ionic conducting inorganic particle;

and

(ii) at least one TFE (co)polymer,

wherein an amount of the (ii) at least one TFE (co)polymer is from 1.0 to 20.0 wt%, preferably from 2.0 to 15.0 wt% and more preferably from 3.0 to 10.0 wt%, based on the total weight of the film.

14. The free-standing solid composite electrolyte film according to claim 13, wherein the (ii) at least one TFE (co)polymer has a three-dimensional (3-D) structure consisting of nodes, fibrils interconnecting the nodes, and the free spaces between the fibrils and the nodes, and the (i) at least one sulfide-based solid ionic conducting inorganic particle is positioned inside the free spaces.

15. The free-standing solid composite electrolyte film according to claim 13 or 14, wherein the (ii) at least one TFE (co)polymer is TFE homopolymer, TFE copolymer comprising recurring units derived from at least one per(halo)fluoroolefm different from TFE monomer, in an amount of from 0.01 to 0.25 % moles, preferably from 0.05 to 0.175 % moles, with respect to the total moles of the recurring units of the TFE copolymer, or blends thereof.

16. The free-standing solid composite electrolyte film according to any of claims 13 to 15, wherein the thickness of the film is from 10 to 150 pm, preferably from 15 to 100 pm, and more preferably from 20 to 60 pm.

17. A solid state battery comprising the free-standing solid composite electrolyte film according to any of claims 13 to 16.

18. Use of the free-standing solid composite electrolyte film according to any of claims 13 to 16, in a solid state battery for improving ionic conductivity and mechanical properties.