Garnet-type lithium-ion solid-state conductor

A solid state electrolyte comprising:

• a core comprising a first solid state electrolyte;
• and
• a shell comprising a compound of Formula 1 on the core
• Li
• 7
• -
• a
• *
• α
• -
• (
• b
• -
• 4
• )
• *
• β
• -
• x
• ⁢
• M
• α
• a
• ⁢
• La
• 3
• ⁢
• Hf
• 2
• -
• β
• ⁢
• M
• β
• b
• ⁢
• O
• 12
• -
• x
• -
• δ
• ⁢
• X
• x
• (
• 1
• )
• wherein
• Ma is a cationic element having a valence of a+;
• Mb is a cationic element having a valence of b+;
• and
• X is an anion having a valence of −1,
• wherein, when Ma comprises H, 0≤α≥5, otherwise 0≤α≤0.75, and
• wherein 0<ß≤1.5, 0<x≤1.5, and (a*α+(b−4)ß+x)>0, 0<δ≤1, and
• wherein the first solid state electrolyte and the compound of Formula 1 are different.

A porous separator for a battery, the separator comprising:

• a porous substrate, and
• a compound of Formula 1 on the substrate
• Li
• 7
• -
• a
• *
• α
• -
• (
• b
• -
• 4
• )
• *
• β
• -
• x
• ⁢
• M
• α
• a
• ⁢
• La
• 3
• ⁢
• Hf
• 2
• -
• β
• ⁢
• M
• β
• b
• ⁢
• O
• 12
• -
• x
• -
• δ
• ⁢
• X
• x
• (
• 1
• )
• wherein
• Ma is a cationic element having a valence of a+;
• Mb is a cationic element having a valence of b+;
• and
• X is an anion having a valence of −1,
• wherein, when Ma comprises H, 0≤α≤5, otherwise 0≤α≤0.75, and
• wherein 0<ß≤1.5, 0<x≤1.5, and (a*α+(b−4)ß+x)>0, 0<δ≤1.