Glass-polymer composite electrolyte and a method of preparing the same

• US 6,066,417 A
• Filed: 05/21/1998
• Issued: 05/23/2000
• Est. Priority Date: 06/10/1997
• Status: Expired due to Term

• Current Assignee: Samsung Display Devices Co., Ltd. (Samsung SDI Company Limited)
• Original Assignee: Samsung Display Devices Co., Ltd. (Samsung SDI Company Limited)
• Inventors: Cho, Jae-phil, Kim, Geun-bae
• Primary Examiner(s): Nuzzolillo, Maria
• Assistant Examiner(s): TSANG FOSTER, SUSY N
• Application Number:
  US09/083,063
• Time in Patent Office: 733 Days
• Field of Search: 429/199, 429/207, 429/303, 429/305, 429/319, 429/322, 429/323, 429/188, 429/189, 252/62.2, 252/500, 252/519.4, 204/421
• US Class Current: 429/303
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 6/18 with solid electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A glass-polymer composite electrolyte includes a glass electrolyte having a lithium compound and at least one compound selected from P₂ S₅, SiS₂ or GeS₂, and a polymer electrolyte comprising a lithium salt.

Claims

1. A glass-polymer composite electrolyte comprising:

a glass electrolyte comprising at least one lithium compound and at least one compound selected from the group consisting of P₂ S₅, SiS₂ and GeS₂ ; and

a polymer electrolyte comprising a lithium salt.

2. The glass-polymer composite electrolyte of claim 1 wherein the compound is GeS₂.

3. The glass-polymer composite electrolyte of claim 1 wherein the at least one lithium compound is at least one compound selected from the group consisting of Li₂ S, LiI, Li₂ O, Li₂ SO₄, LiBr and LiCl.

4. The glass-polymer composite electrolyte of claim 1 wherein the glass electrolyte is GeS₂ --Li₂ S--LiI.

5. The glass-polymer composite electrolyte of claim 1 wherein the glass electrolyte comprises GeS₂ :

Li₂ S;

LiI in a molar ratio of 0.3-0.45;

0.1-0.3;

0-0.25.

6. The glass-polymer composite electrolyte of claim 1 wherein the polymer electrolyte comprises at least one polymer selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(vinylidene fluoride), and poly(acrylonitrile).

7. The glass-polymer composite electrolyte of claim 6 wherein the lithium salt comprises at least one compound selected from the group consisting of LiCIO₄, LiCF₃ SO₃, LiAsF₆, LiPF₆, LiN(CF₃ SO₂)₂, LiBr and lithium acetate.

8. The glass-polymer composite electrolyte of claim 1 wherein the volume ratio of the glass electrolyte:

polymer electrolyte is 75;

25 to 93;

7.

9. The glass-polymer electrolyte of claim 1, wherein the compound is P₂ S₅.

10. The glass-polymer electrolyte of claim 1, wherein the compound is SiS₂.

11. A battery comprising a glass-polymer composite electrolyte of claim 1.

12. The battery of claim 11 wherein the compound is GeS₂.

13. The battery of claim 11 wherein the glass electrolyte is GeS₂ LiS--LiI.

14. The battery of claim 11 wherein the glass electrolyte comprises GeS₂ :

Li₂ S;

LiI in a molar ratio of 0.3-0.45;

0.1-0.3;

0-0.25.

15. A method of preparing a glass-polymer composite electrolyte comprising:

heating a mixture of at least one lithium compound and at least one compound selected from the group consisting of P₂ S₅, SiS₂ and GeS₂ at 700 to 900°

C.;

forming a glass electrolyte by cooling the mixture;

mixing the glass electrolyte with a polymer electrolyte comprising a lithium salt to produce a composite electrolyte; and

shaping by compressing the composite electrolyte at 60 to 100°

C.

16. The method of claim 15 wherein the compound is GeS₂.

17. The method of claim 15 wherein the glass electrolyte is GeS₂ --Li₂ --LiI.

18. The method of preparing a glass-polymer composite electrolyte of claim 15 wherein the glass electrolyte comprises GeS₂ :

Li₂ S;

LiI in a molar ratio of 0.3-0.45;

0.1-0.3;

0-0.25.

19. The method of claim 15, wherein the compound is P₂ S₅.

20. The method of claim 15, wherein the compound is SiS₂.