Lithium ion-conductive solid electrolyte containing lithium titanium phosphate

摘要

A lithium ion-conductive solid electrolyte consisting of a compound represented by the chemical formula, Li1+xMxTi2-x(PO4)3 (M is at least one element selected from the group consisting of Fe, Al and rare earth elements and x is a number of 0.1 to 1.9), a compound represented by the chemical formula, Li1+yTi2SiyP3-yO12 (Y is a number of 0.1 to 2.9), or a compound obtained by mixing a compound represented by the chemical formula, LiTi2(PO4)3 with a lithium compound other than LiTi2(PO4)3 and sintering the resulting mixture. Said lithium ion-conductive solid electrolyte can be produced by subjecting to solid phase reaction a mixture of a titanium oxide, a lithium salt, a phosphoric salt and M2O3 (M is at least one element selected from the group consisting of Fe, Al and rare earth elements) or a silicon oxide or a mixture of LiTi2(PO4)3 and other lithium compound. Said lithium ion-conductive electrolyte can be used in the form of a lithium ion-conductive electrolyte sheet to prepare a structure suitable for solid electrochemical elements.