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US 2003/0118906 A1Published application
Primary lithium electrochemical cell
AssigneeThe Gillette Company
InventorsWilliam L. Bowden, Klaus Brandt, Paul A. Christian, Zhiping Jiang
Life of this patent
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Abstract
A primary electrochemical cell includes a cathode including lambda-manganese dioxide (γ-MnO2), an anode including lithium or a lithium alloy, a separator interposed between the cathode and the anode, and a non-aqueous electrolyte contacting the anode and the cathode.
Claims25
A primary lithium electrochemical cell comprising:
- a cathode including lambda-manganese dioxide;
- an anode including lithium;
- a separator between the anode and the cathode;
- and
- an electrolyte contacting the cathode, the anode and the separator,
- wherein the cell has an average closed circuit voltage of about between about 3.8 and 4.1V and a specific discharge capacity to a 3V cutoff of greater than 130 mAh/g at a nominal discharge rate of 1 mA/cm2.
3 more elements
A primary lithium electrochemical cell comprising:
- a cathode including lambda-manganese dioxide having a total pore volume of greater than 0.11 cubic centimeters per gram, and the lambda-manganese dioxide has a BET surface area of greater than 8 m2/g, wherein the lambda-manganese dioxide is maintained during processing at a temperature of 120° C. or less;
- an anode including lithium or a lithium alloy;
- a separator between the anode and the cathode;
- and
- an electrolyte contacting the cathode, the anode and the separator,
- wherein the cell has an average closed circuit voltage of about 4V, a specific discharge capacity to a 3V cutoff of greater than 130 mAh/g at a nominal discharge rate of 1 mA/cm2.
3 more elements
A method of preparing lambda-manganese dioxide comprising:
- contacting water with a compound of the formula Li1+xMn2−xO4, wherein x is from −0.02 to +0.02;
- adding an acid to the water and compound until the water has a pH of 1 or less;
- separating a solid from the water and acid;
- and
- drying the solid at a temperature of 120° C. or below to obtain the lambda-manganese dioxide.
2 more elements
A method of manufacturing an electrochemical cell comprising:
- providing an positive electrode including a lambda-manganese oxide;
- and
- forming a cell including the electrode and a lithium negative electrode,
- wherein the cell has a closed circuit voltage of about 4V and a specific discharge capacity at a nominal discharge rate of 1 mA/cm2 to a 3V cutoff of greater than 120 mAh/g.
1 more element
Dependencies are inferred from the claim text.