Double current collector cathode design using the same active material in varying formulations for alkali metal or ion electrochemical cells
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United States of America Patent
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Jan 6, 2004
Grant Date -
May 23, 2002
app pub date -
Oct 3, 2001
filing date -
Nov 17, 2000
priority date (Note) -
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Abstract
A new sandwich cathode design is provided comprising a cathode active material mixed with a binder and a conductive diluent in at least two differing formulations. The formulations are then individually pressed on opposite sides of a current collector, so that both are in direct contact with the current collector. Preferably, the active formulation on the side of the current collector facing the anode is of a lesser percentage of the active material than that on the opposite side of the current collector. Such an exemplary cathode design might look like: SVO (100-x % active)/current collector/SVO (100-y % active)/current collector/SVO (100-x % active), wherein x is greater than y.
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