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US 12,084,387 B2Granted
Processes and materials for casting and sintering green garnet thin films
AssigneeQuantumScape Battery, Inc.
InventorsOleh Karpenko, Gengfu Xu, Niall Donnelly, Sriram Iyer, Tim Holme
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Abstract
Set forth herein are processes and materials for making ceramic thin films by casting ceramic source powders and precursor reactants, binders, and functional additives into unsintered thin films and subsequently sintering the thin films under controlled atmospheres and on specific substrates.
Claims31
A method for sintering a green tape, the method comprising:
- (a) providing at least one source powder;
- wherein the at least one source powder is a lithium-stuffed garnet powder;
- (b) modifying the at least one source powder to prepare a modified source powder using an aprotic solvent;
- (c) providing a slurry of the modified source powder;
- (d) casting the slurry to form a green tape;
- wherein the green tape comprises the modified source powder, an aprotic solvent, a binder, and a dispersant;
- and
- wherein the amount of source powder in the green tape is at least 75%, 80%, 85%, or 90% by weight;
- and
- wherein modified source powder has a particle size distribution having a d50 of 50 nm to 5 μm;
- (e) drying the green tape;
- (f) stress relieving the green tape;
- and
- (g) sintering the green tape.
11 more elements
A green tape, comprising:
- a source powder, wherein the source powder is a lithium-stuffed garnet powder;
- an aprotic solvent;
- a binder;
- a pH modifier selected from citric acid or ammonia hydroxide;
- and
- a dispersant;
- wherein the amount of source powder in the green tape is at least 75%, 80%, 85%, or 90% by weight;
- and
- wherein the modified source powder has a particle size distribution having a d50 of 50 nm to 5 μm.
6 more elements
Dependencies are inferred from the claim text.