SOLID-STATE ELECTROLYTE, CATHODE ELECTRODE, AND METHODS OF MAKING SAME FOR SULFIDE-BASED ALL-SOLID-STATE-BATTERIES
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
H01M-010/0562
H01M-010/0525
H01M-010/054
C01G-015/00
출원번호
17820662
(2022-08-18)
공개번호
20230055896
(2023-02-23)
발명자
/ 주소
Zhu, Hongli
Cao, Daxian
출원인 / 주소
Zhu, Hongli
인용정보
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초록▼
Current sulfide solid-state electrolyte (SE) membranes utilized in all-solid-state lithium batteries (ASLBs) have a high thickness (0.5˜1.0 mm) and low ion conductance (25 mS), which limit the cell-level energy and power densities. Based on ethyl cellulose's unique amphipathic molecular structure, s
Current sulfide solid-state electrolyte (SE) membranes utilized in all-solid-state lithium batteries (ASLBs) have a high thickness (0.5˜1.0 mm) and low ion conductance (25 mS), which limit the cell-level energy and power densities. Based on ethyl cellulose's unique amphipathic molecular structure, superior thermal stability, and excellent binding capability, this work fabricated a freestanding SE membrane with an ultralow thickness of 47 μm. With ethyl cellulose as an effective disperser and binder, the Li6PS5Cl is uniformly dispersed in toluene and possesses superior film formability. In addition, ultralow areal resistance of 5.10 Ωcm−2 and remarkable ion conductance of 190.11 mS (one order higher than the conventional sulfide SE layer) have been achieved. The ASLB assembled with this SE membrane delivers cell-level high gravimetric and volumetric energy densities of 175 Wh kg−1 and 675 Wh L−1, individually.
대표청구항▼
1. A method of making a solid-state electrolyte, the method comprising: a. dissolving ethyl cellulose in a nonpolar solvent;b. dispersing a sulfide solid electrolyte in the nonpolar solvent;c. casting the dispersion of the sulfide solid electrolyte in the nonpolar solvent under vacuum filtration to
1. A method of making a solid-state electrolyte, the method comprising: a. dissolving ethyl cellulose in a nonpolar solvent;b. dispersing a sulfide solid electrolyte in the nonpolar solvent;c. casting the dispersion of the sulfide solid electrolyte in the nonpolar solvent under vacuum filtration to form a thin membrane; andd. heating the thin membrane to remove the nonpolar solvent, thereby forming a solid-state electrolyte. 2. The method of claim 1, wherein the nonpolar solvent is toluene. 3. The method of claim 1, wherein the sulfide solid electrolyte is Li6PS5Cl. 4. The method of claim 1, wherein the solid-state electrolyte has a thickness from about 20 μm to about 50 μm. 5. (canceled) 6. The method of claim 1, wherein the solid-state electrolyte has a thickness of less than 50 μm. 7. The method of claim 1, wherein the solid-state electrolyte has a resistance of less than 20Ω at 30° C. 8. The method of claim 1, wherein the solid-state electrolyte as a resistance from 5Ω to 20Ω at 30° C. 9. The method of claim 1, wherein the solid-state electrolyte has a resistance of about 5.26Ω at 30° C. 10. The method of claim 1, wherein the solid-state electrolyte has a conductivity of at least 0.75 mS cm−1 at 30° C. 11. The method of claim 1, wherein the solid-state electrolyte as a conductivity from 0.75 mS cm−1 to 5 mS cm−1 at 30° C. 12. (canceled) 13. The method of claim 1, wherein the solid-state electrolyte has an ion conductance of at least 150 mS at 30° C. 14. The method of claim 1, wherein the solid-state electrolyte as an ion conductance from about 150 mS to about 300 mS at 30° C. 15. (canceled) 16. The method of claim 1, wherein the solid-state electrolyte has from about 1 wt. % ethyl cellulose to about 5 wt. % ethyl cellulose. 17. The method of claim 1, wherein the solid-state electrolyte has less than about 1 vol % pores. 18. The method of claim 1, wherein the solid-state electrolyte has from about 0.05 vol. % pores to about 3 vol. % pores. 19. (canceled) 20. The method of claim 1, wherein chlorine, sulfur, and phosphorus are homogeneously distributed throughout the solid-state electrolyte. 21. The method of claim 1, wherein the ethyl cellulose does not interrupt ion conductance of the solid state electrolyte. 22. (canceled) 23. A method of making a cathode, the method comprising: a. dissolving LiCl in water;b. dissolving InCl3 in the water;c. dispersing LiCoO2 in the water;d. heating the water with dissolved LiCl, dissolved InCl3, and dispersed LiCoO2 to remove the water, thereby forming a mixture of LiCoO2 and Li3InCl6; ande. annealing the mixture of LiCoO2 and Li3InCl6. 24-26. (canceled) 27. A battery comprising: a. a cathode current collector;b. a cathode comprising LiCoO2 and Li3InCl6;c. a solid-state electrolyte comprising a sulfide solid electrolyte and ethyl cellulose;d. an anode; ande. an anode current collector. 28-37. (canceled) 38. A method of making a battery, the method comprising: a. pressing together: i. a cathode comprising LiCoO2 and Li3InCl6;ii. a solid-state electrolyte comprising a sulfide solid electrolyte and ethyl cellulose; andiii. an anode comprising In—Li;b. attaching a cathode current collector to the cathode; andc. attaching an anode current collector to the anode.
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