METHOD FOR MAKING UNIFORM POROUS SURFACE LAYER ON GARNET THIN FILM
A solid garnet composition includes a bulk composition having a lithium garnet; and a surface composition having a protonated garnet on at least a portion of the exterior surface of the lithium garnet, such that the protonated garnet is uniformly disposed over the at least a portion of the exterior surface of the lithium garnet. A method of making a solid garnet composition includes pre-treating an air sensitive lithium-containing garnet with water to form a uniform protonated garnet surface composition; and contacting the uniform protonated garnet surface composition with an acid to form a porous uniform protonated garnet surface composition.
1 . A solid garnet composition, comprising:
a bulk composition comprising a lithium garnet; and
a surface composition comprising a protonated garnet on an exterior surface of the lithium garnet,
wherein the protonated garnet is uniformly disposed over the exterior surface of the lithium garnet.
2 . The composition of claim 1 , wherein the surface protonated portion of the garnet is compositionally stable in air and insensitive to water and carbon dioxide.
3 . (canceled)
4 . The composition of claim 1 wherein
the lithium garnet is Li 7 La 3 Zr 2 O 12 and
the protonated garnet is Li (7-x) H x La 3 Zr 2 O 12 , where x is from 0.1 to 7.
5 . (canceled)
6 . The composition of claim 1 , wherein the surface composition comprises a surface free of at least one of LiOH, Li 2 CO 3 , or a combination thereof.
7 - 20 . (canceled)