High discharge capacity lithium battery
First Claim
1. An electrochemical battery cell comprising a housing;
- a negative electrode strip comprising metallic lithium, a positive electrode strip comprising an active material mixture and an electrolyte comprising at least one salt dissolved in a nonaqueous electrolyte disposed within the housing; and
a separator disposed between the negative and positive electrodes;
the cell having a ratio of a cathode interfacial capacity to an electrode assembly interfacial volume of at least 710 mAh/cm3.
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Accused Products
Abstract
A lithium/iron disulfide electrochemical battery cell with a high discharge capacity. The cell has a lithium negative electrode, an iron disulfide positive electrode and a nonaqueous electrolyte. The positive electrode mixture containing the iron disulfide contains highly packed solid materials, with little space around the solid particles, to provide a high concentration of iron disulfide within the mixture. The separator is thin, to allow more space within the cell for active materials, yet strong enough to prevent short circuits between the positive and negative electrodes under abusive conditions, even when swelling of the cathode during cell discharge places additional stressed on the separator. As a result, the ratio of the interfacial capacity of the positive electrode to the electrode interfacial volume is high, as is the actual capacity on low rate/low power and high rate/high power discharge.
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Citations
29 Claims
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1. An electrochemical battery cell comprising a housing;
- a negative electrode strip comprising metallic lithium, a positive electrode strip comprising an active material mixture and an electrolyte comprising at least one salt dissolved in a nonaqueous electrolyte disposed within the housing; and
a separator disposed between the negative and positive electrodes;
the cell having a ratio of a cathode interfacial capacity to an electrode assembly interfacial volume of at least 710 mAh/cm3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- a negative electrode strip comprising metallic lithium, a positive electrode strip comprising an active material mixture and an electrolyte comprising at least one salt dissolved in a nonaqueous electrolyte disposed within the housing; and
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21. An electrochemical battery cell comprising a housing;
- a negative electrode, a positive electrode and an electrolyte disposed within the housing; and
a separator disposed between the negative and positive electrodes;
wherein;
(a) the housing comprises a cylindrical container with an integral closed bottom end, an initially open top end, a side wall extending between the bottom and top ends and a cover disposed in the top end to close the cell;
(b) the negative electrode is in the form of a strip with two opposing major surfaces and comprises metallic lithium;
(c) the positive electrode is in the form of a strip with two opposing major surfaces and comprises an active material mixture, the active material comprising greater than 50 weight percent iron disulfide;
(d) the electrolyte comprises one or more salts dissolved in a nonaqueous organic solvent;
(e) the negative and positive electrodes and the separator form a spiral wound cylindrical electrode assembly, with a radial outer surface disposed adjacent an inner surface of the container side wall;
(f) the electrode assembly has an interfacial volume;
(g) the positive electrode has an interfacial capacity;
(h) a ratio of the positive electrode interfacial capacity to the electrode assembly interfacial volume is at least 710 mAh/cm3; and
(h) the separator is a microporous membrane comprising polyethylene, with a machine direction and a transverse direction, an average thickness less than 22 μ
m and a tensile stress of at least 1.0 kgf/cm in both the machine direction and the transverse direction. - View Dependent Claims (22, 23, 24, 25, 26)
- a negative electrode, a positive electrode and an electrolyte disposed within the housing; and
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27. An electrochemical battery cell comprising a housing;
- a negative electrode, a positive electrode and an electrolyte disposed within the housing; and
a separator disposed between the negative and positive electrodes;
wherein;
(a) the cell is a cylindrical FR6 type Li/FeS2 cell with a spiral wound electrode assembly having an electrode assembly interfacial volume;
(b) the cell has an interfacial capacity of at least 3500 mAh;
(c) the separator is a microporous membrane comprising polyethylene and has an average thickness less than 22 μ
m, a tensile stress of at least 2.0 kgf/cm in both a machine direction and a transverse direction, a dielectric breakdown voltage of at least 2400 volts, a maximum effective pore size of 0.08 μ
m to 0.20 μ
m and a BET specific surface area of 4.0 to 15 m2/g. - View Dependent Claims (28)
- a negative electrode, a positive electrode and an electrolyte disposed within the housing; and
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29. An electrochemical battery cell comprising a housing;
- a negative electrode, a positive electrode and an electrolyte disposed within the housing; and
a separator disposed between the negative and positive electrodes;
wherein;
(a) the cell is a cylindrical FR6 type Li/FeS2 cell with a spiral wound electrode assembly having an electrode assembly interfacial volume;
(b) the separator is a microporous membrane comprising polyethylene and has an average thickness less than 22 μ
m, a tensile stress of at least 2.0 in both a machine direction and a transverse direction, a dielectric breakdown voltage of at least 2400 volts and a maximum effective pore size of 0.08 μ
m to 0.20 μ
m;
(c) the positive electrode comprises an active material comprising at least 95 weight percent iron disulfide; and
(d) the cell is capable of providing a discharge capacity of at least 2950 mAh when discharged at 200 mA continuously to 1.0 volt and a discharge capacity of at least 2600 mAh when discharged at 1000 mA continuously to 1.0 volt.
- a negative electrode, a positive electrode and an electrolyte disposed within the housing; and
Specification