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

[Claim 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. [Claim 2] The viscosity of the above composition is 100 cP to 150 cP. The composition for solid polymer electrolytes according to claim 1. [Claim 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. [Claim 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. [Claim 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. [Claim 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. [Claim 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. [Claim 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. [Claim 9] A solid polymer electrolyte composition prepared according to claim 1 A solid polymer electrolyte characterized by the following features. [Claim 10] Manufactured using an in-situ crosslinking polymerization method. The solid polymer electrolyte according to claim 9. [Claim 11] A solid polymer electrolyte manufactured according to claim 9. A lithium secondary battery characterized by the following features. [Claim 12] The solid polymer electrolyte is coated in a roll-to-roll process. The lithium secondary battery according to claim 11.

Images