Lithium secondary battery and electrode for lithium secondary battery

摘要

An object of the invention is to provide a lithium secondary battery using a fused salt at ambient temperature where a high capacity is able to be maintained even when it is stored at a high temperature environment or even when it is subjected to charge and discharge repeatedly and also to provide an electrode for a nonaqueous electrolytic lithium secondary battery. There is disclosed a lithium secondary battery using at least a fused salt at ambient temperature having ionic conductivity in which at least one of the positive and negative electrode contains a powder which solely comprises an inorganic solid electrolyte having lithium ionic conductivity. There is also disclosed an electrode for a lithium secondary battery using, at least, a ionic liquid having ionic conductivity which contains a powder solely comprising inorganic solid electrolyte having lithium ionic conductivity.

主权项

1. A lithium secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte comprising ambient-temperature-fused salt having ionic conductivity, wherein at least one of the positive and negative electrodes contains a powder consisting of lithium composite oxide glass ceramics having lithium ionic conductivity, wherein said lithium composite oxide glass ceramics comprises Li1+x+zMx(Ge1-yTiy)2-xSizP3-zO12, in which 0≦x≦0.8, 0≦y≦1.0, 0≦z≦0.6 and M is one or more element(s) selected from Al and Ga, and wherein the ambient-temperature-fused salt comprises one or more selected from the group consisting of EIM-TFSI (1-ethyl-3-methylimidazolidium-bis(trifluoromethane-sulfonyl)-imide), EMI-BF4 (1-ethyl-3-methylimidazolidium-tetrafluoroborate), TMPA-TFSI (trimethylpropylammonium-bistrifluoromethylsulfonylimide) and PP13 (N-methyl-N-propylpiperidinium) with a lithium salt such as LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiN(SO2CF3)2 (lithium bistrifluoromethane sulfonimide), LiN(SO2C2F5)2 (lithium bis(pentafluoroethanesulfonyl)imide), LiSO3CF3 (lithium trifluoromethanesulfonate) and LiPF6 (lithium hexafluorophosphate).