Iron, fluorine, sulfur compounds for battery cell cathodes
AssigneeQuantumScape Corporation
InventorsTimothy P. Holme, Joseph Han, Weston Arthur Hermann, Rainer J. Fasching, Bradley O. Stimson, Cheng Chieh Chao
Life of this patent
Estimating the term…
Abstract
Provided herein are energy storage device cathodes with high capacity electrochemically active material including compounds that include iron, fluorine, sulfur, and optionally oxygen. Batteries with active materials including a compound of the formula FeFaSbOc exhibit high capacity, high specific energy, high average discharge voltage, and low hysteresis, even when discharged at high rates. Iron, fluorine, and sulfur-containing compounds may be ionically and electronically conductive.
Claims20
A cathode for a battery, the cathode comprising an electrochemically active material or combination of electrochemically active materials comprising:
- (i) a compound of the formula FeFaSbOc;
- and/or
- (ii) a combination of iron metal, and lithium fluoride, lithium oxide, and/or lithium sulfide,
- wherein the atomic ratio of the iron to fluorine, sulfur, and oxygen in (i) and (ii) is 1:a:b:c, and
- wherein 1≦a≦9, 0<b≦3, and 0≦c≦2.
An energy storage device comprising:
- an anode
- an electrolyte, and
- a cathode comprising
- a current collector, and
- electrochemically active material, or combination of electrochemically active materials comprising
- a compound of the formula FeFaSbOc;
- and/or
- a combination of iron metal, and lithium fluoride, lithium oxide, and/or lithium sulfide,
- wherein the atomic ratio of the iron to fluorine to sulfur to oxygen in (1) and (2) is 1:a:b:c:, and
- wherein 1≦a≦9, 0<b≦3, and 0≦c≦2.
A method of preparing a cathode for a battery, the method comprising:
- preparing an electrochemically active material or combination of electrochemically active materials comprising:
- (i) a compound of the formula FeFaSbOc;
- and/or
- (ii) a combination of iron metal, and lithium fluoride, oxide, and/or sulfide,
- wherein the atomic ratio of the iron to fluorine, sulfur, and oxygen in (i) and (ii) is 1:a:b:c, and
- wherein 1≦a≦9, 0<b≦3, and 0≦c≦2;
- and
- connecting the electrochemically active material to a current collector or a terminal for the battery.
Dependencies are inferred from the claim text.