Thin film battery having textured layer
AssigneeMotorola, Inc.
InventorKurt W. Eisenbeiser
Life of this patent
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Abstract
A monolithically integrated lithium thin film battery (10) provides increased areal capacity on a single level (without stacking of multiple cells). The Lithium thin film battery (10) comprises a substrate (12) having a surface (13) textured to comprise a plurality of openings (16) having sides (15) angled between 10 and 80 degrees to the surface (13). A current collector (18) and a cathode (22) are formed on the substrate (12) and within the openings (16). An electrolyte (24) comprising lithium phosphorous oxynitride is formed by physical vapor deposition on the cathode (22), thereby providing a layer on the surface of the cathode (22) and within the openings (16) of the cathode having substantially the same thickness. An anode (26) and a capping layer (28) are then formed on the electrolyte (24).
Claims14
A thin film battery comprising:
- a current collector having a surface configured to comprise a plurality of openings having sides angled between 10 and 80 degrees to the surface with respect to the thickness direction, the angled sides within each opening joined to one another;
- a cathode formed on the current collector including within the openings;
- an electrolyte formed by physical vapor deposition on the cathode including within the openings;
- and
- an anode formed on the electrolyte including within the openings.
A thin film battery comprising:
- a substrate having a surface textured to comprise a plurality of openings having sides angled between 10 and 80 degrees to the surface with respect to the thickness direction, the angled sides within each opening joined to one another;
- a current collector formed on the substrate;
- a cathode formed on the current collector;
- an electrolyte comprising lithium phosphorus oxynitride formed by physical vapor deposition on the cathode;
- and
- an anode formed on the electrolyte.
A method of fabricating a thin film battery, the method comprising:
- configuring a current collector having a surface to form a plurality of openings in the surface, the openings having sides angled between 10 and 80 degrees to the surface with respect to the thickness direction, the angled sides within each opening joined to one another;
- forming a cathode on the surface and within the openings of the current collector;
- depositing an electrolyte by physical vapor deposition on the cathode including within the openings;
- and
- forming an anode on the electrolyte.
Dependencies are inferred from the claim text.