A solid electrolyte which contains a garnet-type composite metal oxide phase (L) and shows an excellent lithium ion conductivity is provided. The solid electrolyte contains a garnet-type composite metal oxide phase (L) and a phase (D) different from the phase (L). The phase (L) contains Li, La, Zr,
A solid electrolyte which contains a garnet-type composite metal oxide phase (L) and shows an excellent lithium ion conductivity is provided. The solid electrolyte contains a garnet-type composite metal oxide phase (L) and a phase (D) different from the phase (L). The phase (L) contains Li, La, Zr, O, and Ga, and an Li site in the phase (L) is substituted with the Ga. A lattice constant of the solid electrolyte is not smaller than 12.96 Å. The phase (D) contains at least one of LiF, BaZrO3, YF3, SrF2, and ScF3.
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1. A solid electrolyte comprising: a garnet-type composite metal oxide phase (L); anda phase (D) different from the phase (L),wherein: the phase (L) contains Li, La, Zr, O, and Ga,an Li site in the phase (L) is substituted with the Ga,a lattice constant of the solid electrolyte is not smaller than 1
1. A solid electrolyte comprising: a garnet-type composite metal oxide phase (L); anda phase (D) different from the phase (L),wherein: the phase (L) contains Li, La, Zr, O, and Ga,an Li site in the phase (L) is substituted with the Ga,a lattice constant of the solid electrolyte is not smaller than 12.96 Å, andthe phase (D) contains at least one selected from the group consisting of LiF, BaZrO3, YF3, SrF2, and ScF3. 2. The solid electrolyte according to claim 1, wherein when the phase (D) contains the LiF, the phase (D) further contains at least one of elements Al and La. 3. The solid electrolyte according to claim 1, wherein the phase (D) is present in at least a part of an interface of the phase (L). 4. A solid electrolyte comprising a garnet-type composite metal oxide phase (L), wherein: the solid electrolyte is synthesized by performing mechanochemical treatment on a raw material mixture containing Li source powder, La source powder, Zr source powder, and Ga source powder in presence of a reaction aid containing a mixture of LiX1 and MX2p,each of X1 and X2 is F, Cl, Br, or I, X1 and X2 is identical to each other or different from each other, M is Ba, Y, Sr, or Sc, and p is a value equal to an atomic valence of M,the phase (L) contains Li, La, Zr, O, and Ga, anda part of an Li site in the phase (L) is substituted with the Ga. 5. The solid electrolyte according to claim 4, wherein each of the X1 and the X2 is F. 6. The solid electrolyte according to claim 4, wherein: the solid electrolyte further comprises a phase (D) different from the phase (L),the phase (D) contains a compound containing at least one of constituent elements of the reaction aid, andthe phase (D) is present in at least a part of an interface of the phase (L). 7. The solid electrolyte according to claim 1, wherein an Li+ ion conductivity of the solid electrolyte is not lower than 1.0×10−4 S/cm. 8. The solid electrolyte according to claim 4, wherein an amount of the reaction aid with respect to a total of 100 parts by mass of the raw material mixture is not larger than 15 parts by mass. 9. The solid electrolyte according to claim 4, wherein the solid electrolyte has been sintered at 1100 to 1350° C. for 10 to 30 hours after the mechanochemical treatment. 10. The solid electrolyte according to claim 4, wherein an Li+ ion conductivity of the solid electrolyte is not lower than 1.0×10−4 S/cm.
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