Non-aqueous electrochemical cells
First Claim
1. A primary electrochemical cell, comprising (1) a cathode including an active cathode material selected from the group consisting of manganese dioxide and iron disulfide, the active cathode material including water, (2) an anode comprising lithium (3)an aluminum couple, and (4) an electrolyte, in contact with a surface of the aluminum couple, and comprising (a) from about 300 ppm to about 10,000 ppm of LiBF4 to reduce corrosion of the aluminum couple, (b) LiPF6, and (c) a third lithium salt selected from the group consisting of lithium trifluoromethanesulfonate and lithium trifluoromethanesulphonylimide.
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Abstract
Electrochemical cells are disclosed. In some embodiments, an electrochemical cell includes a cathode, an anode, and an electrolyte having a first lithium salt and LiBF4.
78 Citations
42 Claims
- 1. A primary electrochemical cell, comprising (1) a cathode including an active cathode material selected from the group consisting of manganese dioxide and iron disulfide, the active cathode material including water, (2) an anode comprising lithium (3)an aluminum couple, and (4) an electrolyte, in contact with a surface of the aluminum couple, and comprising (a) from about 300 ppm to about 10,000 ppm of LiBF4 to reduce corrosion of the aluminum couple, (b) LiPF6, and (c) a third lithium salt selected from the group consisting of lithium trifluoromethanesulfonate and lithium trifluoromethanesulphonylimide.
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20. A method, comprising:
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discharging an electrochemical cell only once, the cell comprising a cathode comprising manganese oxide and/or iron disulfide, an anode comprising lithium, an aluminum couple; and an electrolyte, in contact with a surface of the aluminum couple, and comprising (a)from about 300 ppm to about 10,000 ppm LiBF4 to reduce corrosion of the aluminum couple, (b) LiPF6, and (c) a third lithium salt selected from the group consisting of lithium trifluoromethanesulfonate and lithium trifluoromethanesulphonvlimide; and disposing the cell without recharging the cell. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A method of making a primary electrochemical cell in which the corrosion of an aluminum couple is suppressed, the method including
adding a sufficient quantity of LiBF4 to an electrolyte including LiPF6 and a third lithium salt selected from the group consisting of lithium trifluoromethanesulfonate and lithium trifluoromethanesulphonylimide to shift corrosion potential of an aluminum electrode by at least 127 mV when tested by continuous cyclic voltammetry in an electrochemical glass cell having an aluminum working electrode, a lithium reference electrode, and two lithium auxiliary electrodes, the continuous cyclic voltammetry including cycles in which the potential initially is set to an open circuit potential, then anodically scanned to +4.5 V, and then reversed to an open circuit potential, the scan rate being 50 mV/sec, the corrosion potential being the potential at which anodic current density reached 10− - 4A/cm2 at a first cycle; and
incorporating the electrolyte into an electrochemical cell comprising a cathode including an active cathode material selected from the group consisting of manganese dioxide and iron disulfide, the active cathode material including water, an anode comprising lithium, and an aluminum couple in contact with the electrolyte. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
- 4A/cm2 at a first cycle; and
Specification