Liquid containing polymer networks as solid electrolytes

• US 4,792,504 A
• Filed: 09/18/1987
• Issued: 12/20/1988
• Est. Priority Date: 09/18/1987
• Status: Expired due to Term

• Current Assignee: MHB Joint Venture
• Original Assignee: MHB Joint Venture
• Inventors: Lee, Mei-Tsu, Schwab, Gerhart
• Primary Examiner(s): Hearn, Brian E.
• Assistant Examiner(s): Kalafut, Stephen J.
• Application Number:
  US07/098,356
• Time in Patent Office: 459 Days
• Field of Search: 429/192, 252/62.2
• US Class Current: 429/312
• CPC Class Codes: H01M 6/181 with polymeric electrolytes

Abstract

A solid polymeric electrolyte comprising a continuous network of crosslinked polyethylene oxide containing an ionic conducting phase which includes a metal salt and a dipolar aprotic solvent.

Claims

1. A two phase solid polymeric electrolyte comprising a continuous network of crosslinked polyethylene oxide and an ionic conducting phase which includes a metal salt and a dipolar aprotic solvent wherein said polyethylene oxide is crosslinked by reaction with a polyacrylate crosslinking agent in an amount of about 1 to 10 parts crosslinking agent per 100 parts polyethylene oxide and said aprotic solvent is selected from the group consisting of propylene carbonate, gamma-butyrolactone, 1,3-dioxolane, 2-methyl-tetrahydrofuran, dimethyl ethers of glycols, and glymes, and said salt is a lithium salt, said solvent having a dielectric constant of at least 6.

2. The solid electrolyte of claim 1 wherein said aprotic solvent is poly(ethylene glycol) dimethyl ether.

3. A solid state electrochemical cell comprising a lithium metal anode, a cathode of an intercalation compound, and a solid electrolyte, said solid electrolyte being a two phase solid polymeric electrolyte comprising a continuous network of crosslinked polyethylene oxide and an ionic conducting phase which includes a metal salt and a dipolar aprotic solvent wherein said polyethylene oxide is crosslinked by reaction with a polyacrylate crosslinking agent in an amount of about 1 to 10 parts crosslinking agent per 100 parts polyethylene oxide and said aprotic solvent is selected from the group consisting of propylene carbonate, gamma-butyrolactone, 1,3-dioxolane, 2-methyl-tetrahydrofuran, dimethyl ethers of glycols, and glymes, and said salt is a lithium salt, said solvent having a dielectric constant of at least 6.

4. The electrochemical cell of claim 3 wherein said aprotic solvent is a glyme.

5. The eletrochemical cell of claim 3 wherein said aprotic solvent is poly(ethylene glycol) dimethyl ether.

6. An electrochemical device comprising first and second electrodes having a solid electrolyte therebetween, said electrolyte being a two phase solid polymeric electrolyte comprising a continuous network of crosslinked polyethylene oxide and an ionic conducting phase which includes a metal salt and a dipolar aprotic solvent wherein said polyethylene oxide is crosslinked by reaction with a polyacrylate crosslinking agent in an amount of about 1 to 10 parts crosslinking agent per 100 parts polyethylene oxide and said aprotic solvent is selected from the group consisting of propylene carbonate, gamma-butyrolactone, 1,3-dioxolane, 2-methyl-tetrahydrofuran, dimethyl ethers of glycols, and glymes, and said salt is a lithium salt, said solvent having a dielectric constant of at least 6.

7. The electrochemical device of claim 6 wherein said aprotic solvent is a glyme.

8. The electrochemical device of claim 6 wherein said aprotic solvent is poly(ethylene glycol) dimethyl ether.