Solid state cell electrolyte
AssigneesGould Electronics Inc., Dowty Electronic Components Limited
InventorJohn M. North
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Abstract
A solid polymer electrolyte for a solid state electrochemical cell comprises a complex of a solid polymer such as poly(ethene oxide) and an alkali metal salt such as LiClO.sub.4, which polymer is capable of forming donor: acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, the complex being associated with a mixture of more than one 1,3-dioxolane-2-ones, for example ethylene carbonate and propylene carbonate, such that the electrolyte possesses satisfactory ambient temperature ionic conductivity (e.g. 10.sup.-3 to 10.sup.-4 ohm.sup.-1 cm.sup.-1) and a cell including the electrolyte substantially maintains its discharge capacity at ambient temperature after repeated charge/discharge cycling.
Claims5
A solid state electrochemical cell comprising a lithium-containing anode, a cathode, and a solid polymer electrolyte comprising a complex of poly(ethylene oxide) associated with a mixture consisting essentially of ethylene carbonate and propylene carbonate and a lithium salt which is capable of conducting lithium ions and wherein the solid polymer electrolyte remains in the amorphous form at a lower temperature than a solid polymer electrolyte containing the same components but without any propylene carbonate.
Dependencies are inferred from the claim text.