A composition for solid polymer electrolytes containing a cyclic siloxane compound, and a solid polymer electrolyte and secondary battery containing the same.

Abstract

The present invention relates to a composition for solid polymer electrolytes containing a cyclic siloxane compound, and to a solid polymer electrolyte and secondary battery containing the same, wherein mixing a cyclic siloxane compound and a polyalkylene oxide compound and adjusting the viscosity improves the impregnation properties and battery characteristics of the solid polymer electrolyte, providing a solid polymer electrolyte precursor suitable for in-situ crosslinking polymerization and providing a solid polymer electrolyte applicable to roll-to-roll production processes.

Claims

1. Cyclic siloxane compounds as primary plasticizers; Polyalkylene oxide compounds as a second plasticizer; Crosslinking agent; Lithium salts; and, Contains a curing initiator A composition for solid polymer electrolytes characterized by the following features.

2. The viscosity of the above composition is 100 cP to 150 cP. The composition for solid polymer electrolytes according to claim 1.

3. The viscosity of the composition is adjusted by the mixed weight ratio of the first plasticizer and the second plasticizer. The composition for solid polymer electrolytes according to claim 1.

4. The weight ratio of the first plasticizer and the second plasticizer is 7:3 to 1:

9. The composition for solid polymer electrolytes according to claim 1.

5. The composition comprises 40% to 80% by weight of a first plasticizer and a second plasticizer, 10% to 50% by weight of a crosslinking agent, 5% to 40% by weight of a lithium salt, and 0.1% to 5% by weight of a curing initiator. The composition for solid polymer electrolytes according to claim 1.

6. The aforementioned cyclic siloxane compound has the following chemical formula 1: 【Chemistry 1】 (In the above chemical formula 1, R １ and R ２ (where m and n are integers from 0 to 20, respectively, and each is either a hydrogen or a methyl group.) It is represented The composition for solid polymer electrolytes according to claim 1.

7. The aforementioned polyalkylene oxide compound is defined by the following chemical formula 2 or chemical formula 3: 【Chemistry 2】 【Transformation 3】 (In the above Chemical Formula 2 and Chemical Formula 3, R ３ , R ４ , R ５ , R ３ ’, R ４ ’, and R ５ ’ are each hydrogen or a methyl group, R ６ , R ７ , R ６ ’, and R ７ ’ are each a linear or branched alkyl group having 1 to 10 carbon atoms, and o, p, q, x, y, and z are each an integer from 0 to 20) It is represented The composition for solid polymer electrolytes according to claim 1.

8. The aforementioned crosslinking agent is defined by the following chemical formula 4 or chemical formula 5: 【Chemistry 4】 【Transformation 5】 (In the above chemical formulas 4 and 5, R １ , R ２ , and R ３ (Each of these is either a hydrogen atom or a methyl group, and m, n, and t are integers from 0 to 20.) It is represented The composition for solid polymer electrolytes according to claim 1.

9. A solid polymer electrolyte composition prepared according to claim 1 A solid polymer electrolyte characterized by the following features.

10. Manufactured using an in-situ crosslinking polymerization method. The solid polymer electrolyte according to claim 9.

11. A solid polymer electrolyte manufactured according to claim 9. A lithium secondary battery characterized by the following features.

12. The solid polymer electrolyte is coated in a roll-to-roll process. The lithium secondary battery according to claim 11.

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