Solid electrolyte, electrochemical device including the same and method of fabricating the solid electrolyte

• US 5,223,353 A
• Filed: 12/09/1991
• Issued: 06/29/1993
• Est. Priority Date: 03/16/1990
• Status: Expired due to Term

• Current Assignee: Ricoh Company Limited, Sanyo Chemical Industries Limited
• Original Assignee: Ricoh Company Limited, Sanyo Chemical Industries Limited
• Inventors: Samura, Tetsuya, Kabata, Toshiyuki, Kimura, Okitoshi, Kimura, Sachiko, Ohsawa, Toshiyuki
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US07/778,056
• Time in Patent Office: 568 Days
• Field of Search: 429/192, 429/190, 429/30, 429/191, 429/33, 429/194, 429/196, 204/421
• US Class Current: 429/307
• CPC Class Codes: H01B 1/122 Ionic conductors
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 6/22 Immobilising of electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A solid electrolyte with excellent ionic conductivity, which is composed of a viscoelastic material having a structure of a polymerized material and a non-aqueous electrolytic solution contained in the polymerized material, a chemical element containing the solid electrolyte, and a method of fabricating the solid electrolyte are described. This solid electrolyte contains the non-aqueous electrolytic solution in an amount of 200 wt. % or more of the polymer and has a modulus of elasticity of 10² to 10⁵ dyne/cm², and an elongation of 20% or more.

Claims

1. A solid electrolyte comprising a viscoelastic material, wherein said viscoelastic material comprises a polymerized material and a non-aqueous electrolytic solution which is contained in said polymerized material, said electrolytic solution being present in an amount of 200 wt. % or more of said polymerized material.

3. The solid electrolyte as claimed in claim 1 or claim 2, wherein said polymerized material is a polymer of an unsaturated carboxylic acid ester, a polymer of a mixture of polyene/polythiol, or a polyurethane.

6. The solid electrolyte as claimed in any of claims 1, 2, 4 or 5, wherein the content of said non-aqueous electrolytic solution is 400 to 900 wt. %.

7. The solid electrolyte as claimed in any of claims 1, 2, 4, or 5, wherein the concentration of said electrolytic salt is 2 to 5 moles/l.

10. An electrochemical device comprising a solid electrolyte, wherein said solid electrolyte is any of said solid electrolytes as claimed in claims 1, 2, 4 or 5.

11. The electrochemical device as claimed in claim 10, wherein at least one part of the constituent elements of said electrochemical device and said solid electrolyte are composed.

12. A battery comprising any of said solid electrolytes as claimed in claim 1, 2, 4 or 5.

13. A battery comprising electrodes, a separator and a solid electrolyte, wherein said solid electrolyte is any of said solid electrolytes as claimed in claim 1, 2, 4 or 5, wherein said electrode, said separator and said electrolyte are integrally composed.

2. A solid electrolyte comprises a viscoelastic material, wherein said viscoelastic material comprises a polymerized material and a non-aqueous electrolytic solution which is contained in said polymerized material, the content of said non-aqueous electrolytic solution being 200 wt. % or more of said polymerized material, said viscoelastic material having a modulus of elasticity of 10² to 10⁵ dyne/cm², and an elongation of 20% or more.

4. A solid electrolyte comprising a viscoelastic material, wherein said viscoelastic material comprises a polymerized material of an acrylate having a molecular weight of 500 or less represented by formula (I), or a polymerized material of an unsaturated carboxylic acid ester comprising, as the main component, said acrylate of formula (I), and a non-aqueous electrolytic solution comprising an electrolytic salt and a non-aqueous solvent which is contained in said polymerized material, the content of said non-aqueous electrolytic solution being 200 wt. % or more of said polymerized material, and said electrolytic salt being present in a ratio of 1.0 mole/l or more in said non-aqueous electrolytic solution:

##STR6## wherein R₁ represents a hydrogen atom, or a methyl group, R₂ represents a hydrocarbon group or a group containing a heterocyclic ring, and n is an integer of 1 or more.

8. The solid electrolyte as claimed in claim 4 or claim 5, wherein said unsaturated carboxylic acid ester comprises a polyfunctional unsaturated carboxylic acid ester having two or more (meth)acryloyl groups.

9. The solid electrolyte as claimed in claim 8, wherein said polyfunctional unsaturated carboxylic acid ester is present with a ratio of 0.05 to 2 wt. % of said non-aqueous electrolytic solution.

5. A solid electrolyte comprising a viscoelastic material, wherein said viscoelastic material comprises a polymerized material of a compound of formula (II), or a polymerized material of an unsaturated carboxylic acid ester comprising, as the main component, said compound of formula (II), and a non-aqueous electrolytic solution comprising an electrolytic salt and a non-aqueous solvent which is contained in said polymerized material, the content of said non-aqueous electrolytic solution being 200 wt. % or more of said polymerized material, and said electrolytic salt being present in a ratio of 1.0 mole/l or more in said non-aqueous electrolytic solution:

##STR7## wherein R₃ represents a hydrogen atom, or a methyl group, and R₄ represents a group containing a heterocyclic ring.

14. A method of fabricating a solid electrolyte comprising the step of dissolving 100 parts of a compound of formula (I) or formula (II), or an unsaturated carboxylic acid ester comprising said compound of formula (I) or formula (II) as the main component, in 200 or more parts of a non-aqueous electrolytic solution having a concentration of electrolytic salt therein of 1.0 mole/l or more, in the presence of a polymerization initiator, and conducting a polymerization reaction to produce a viscoelastic polymer:

##STR8## wherein R₁ represents a hydrogen atom, or a methyl group, R₂ represents a hydrocarbon group or a group containing a heterocyclic ring, and n is an integer of 1 or more; and

##STR9## wherein R₃ represents a hydrogen atom, or a methyl group, and R₄ represents a group containing a heterocyclic ring.