Patent ID: 8822077

Claim:
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 Li 1+x+z M x (Ge 1-y Ti y ) 2-x Si z P 3-z O 12 , 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 LiBF 4 (lithium tetrafluoroborate), LiClO 4 (lithium perchlorate), LiN(SO 2 CF 3 ) 2 (lithium bistrifluoromethane sulfonimide), LiN(SO 2 C 2 F 5 ) 2 (lithium bis(pentafluoroethanesulfonyl)imide), LiSO 3 CF 3 (lithium trifluoromethanesulfonate) and LiPF 6 (lithium hexafluorophosphate).