Lithium stuffed garnet setter plates for solid electrolyte fabrication
AssigneeQuantumScape Corporation
InventorsSriram Iyer, Tim Holme, Niall Donnelly
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Abstract
Setter plates are fabricated from Li-stuffed garnet materials having the same, or substantially similar, compositions as a garnet Li-stuffed solid electrolyte. The Li-stuffed garnet setter plates, set forth herein, reduce the evaporation of Li during a sintering treatment step and/or reduce the loss of Li caused by diffusion out of the sintering electrolyte. Li-stuffed garnet setter plates, set forth herein, maintain compositional control over the solid electrolyte during sintering when, upon heating, lithium is prone to diffuse out of the solid electrolyte.
Claims17
A setter plate for fabricating solid electrolytes of a rechargeable battery, the setter plate comprising at least two members selected from the group consisting of Li2ZrO3, Li2SiO3, LiLaO2, LiAlO2, Li2O, Li3PO4, and a Li-stuffed garnet compound characterized by the formula LiALaBM′cM″DZrEOF, wherein 4<A<8.5, 1.5<B<4, 0≤C≤2, 0≤D≤2;
- 0≤E<2, 10<F<13, and M′ and M″ are each, independently selected from Al, Mo, W, Nb, Sb, Ca, Ba, Sr, Ce, Hf, Rb, and Ta;
- a surface defined by a first lateral dimension from 1 cm to 96 cm and a second lateral dimension from 1 cm to 96 cm;
- and
- a thickness from 0.1 mm to 100 mm.
A setter plate used for fabricating solid electrolytes of a rechargeable battery, the setter plate comprising:
- an oxide material with lithium concentration greater than 0.02 mol/cm3 and a melting point above 1100° C.;
- a surface defined by a first lateral dimension from 3 cm to 30 cm and a second lateral dimension from 3 cm to 30 cm;
- and
- a thickness from 0.1 mm to 100 mm,
- wherein the oxide material comprises at least two members selected from the group consisting of Li2ZrO3, LiLaO2, LiAlO2, Li2O, Li3PO4, and a Li-stuffed garnet compound characterized by the formula LiALaBM′cM″DZrEOF, wherein 4<A<8.5, 1.5<B<4, 0≤C≤2, 0≤D≤2;
- 0≤E<2, 10<F<13, and M′ and M″ are each, independently selected from Al, Mo, W, Nb, Sb, Ca, Ba, Sr, Ce, Hf, Rb, and Ta.
Dependencies are inferred from the claim text.