Solid polymer electrolyte having an increased conductivity and solid state cell including the electrolyte

Abstract

A solid polymer electrolyte having an increased conductivity is provided luding a solution of at least one lithium salt in at least one polymer host, and wherein said solid polymer electrolyte also includes a dispersion of a lithium ion conducting solid ceramic material. A solid state electrochemical cell including the electrolyte is also provided.

What is claimed is: 
     
       1. A solid polymer electrolyte for use in an electrochemical cell, said polymer electrolyte including a solution of at least one lithium salt in at least one polymer host and wherein said solid polymer electrolyte also includes a solid solution of lithium germanium oxide and lithium vanadium oxide having the general formula Li 3+x  Ge x  V 1-x  O 4  where x has a value between 0.2 and 0.8. 
     
     
       2. A solid polymer electrolyte according to claim 1 wherein said lithium salt is selected from the group consisting of lithium perchlorate, lithium tetrafluoroborate, lithium trifluoromethanesulfonate, and lithium hexafluoroarsenate, wherein said polymer host is at least one polymer selected from the group consisting of polyethylene oxide, polyacetylene, poly (alkylthiophene), polyaniline, phenylene, and phenylsulfide, and said lithium ion conducting solid ceramic material is a solid solution of lithium germanium oxide and lithium vanadium oxide having the general formula Li 3+x  Ge x  V 1-x  O 4  where x has a value between 0.2 and 0.8. 
     
     
       3. A solid polymer electrolyte according to claim 2 wherein said polymer host is polyethylene oxide, said lithium salt is lithium trifluoromethanesulfonate, and said lithium ion conducting solid ceramic material is Li 3 .6 Ge 0 .6 V 0 .4 O 4 . 
     
     
       4. A solid state electrochemical cell including lithium metal, lithium metal alloys, and lithium intercalating compounds as the anode, an electrochemically active metallic inorganic compound as the cathode, and a solid solution of at least one lithium salt in at least one polymer host as the electrolyte wherein said solid polymer electrolyte also includes a solid solution of lithium germanium oxide and lithium vanadium oxide having the general formula Li 3+x  Ge x  V 1-x  O 4  where X has a value between 0.2 and 0.8. 
     
     
       5. A solid state electrochemical cell including a compound selected from the group consisting of lithium metal, lithium metal alloy, LiC 6 , lithiated graphite and lithiated petroleum coke as the anode, a compound selected from the group consisting of LiCoO 2 , Ag 2  CrO 4 , CuO, Bi 2  O 3 , Bi 2  Pb 2  O 5 , Cr 2  O 5 , Cr 3  O 8 , MnO 2 , Ni 3  S 2 , TiS 2 , FeS 2 , VSe 2 , NiS 2 , CoS 2 , V 6  O 13 , V 2  O 5 , LiNiO 2 , LiMnO 2 , CuF 2 ,(CF) n , CuCl 2 , AgCl, and Cr x  V 1-x  S 2  where x has a value of 0 to 1 as the cathode, and a solid solution of at least one lithium salt selected from the group consisting of lithium perchlorate, lithium tetrafluoroborate, lithium trifluoromethanesulfonate, and lithium hexafluoroarsenate in at least one polymer host selected from the group consisting of polyethylene oxide, polyacetylene poly(alkylthiophene), polyaniline, phenylene, and phenylsulfide as the solid polymer electrolyte and wherein said solid polymer electrolyte also includes a dispersion of a lithium ion conducting solid ceramic material including a solid solution of lithium germanium oxide and lithium vanadium oxide having the general formula Li 3+x  Ge x  V 1-x  O 4  where x has a value between 0.2 and 0.8. 
     
     
       6. A solid state electrochemical cell according to claim 5 wherein the anode is lithium, the cathode is LiCoO 2 , the polymer host is polyethylene oxide, the lithium salt is trifluoromethanesulfonate, and the lithium ion conducting solid ceramic material is Li 3 .6 Ge 0 .6 V 0 .4 O 4 .