Patent ID: 8841033

Claim:
A sintered body comprising: a ceramic material having a formula of Li 7-y La 3 Zr 2-y M y O 12 -zAl wherein M represents Nb and/or Ta, wherein y represents a total number of moles of Nb and Ta, and wherein z represents 0.025-0.35 moles, wherein a molar ratio (Nb+Ta)/La is 0.03 or greater to 0.20 or lower, and wherein a molar ratio of La to Zr and M (La: (Zr+M)) is 3:2, the sintered body having a garnet-type or garnet-like crystal structure, a Li ion conductivity of not less than 3.0*10 −5 S/cm, and a density of not less than 4.0 g/cm 3 .