Battery with a controlled release anode
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United States of America Patent
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Mar 8, 2005
Grant Date -
Aug 28, 2003
app pub date -
Feb 22, 2002
filing date -
Feb 22, 2002
priority date (Note) -
Expired
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Abstract
An electrochemical cell including a cathode, an electrolyte in ionic contact with the cathode, and an anode in physical contact with the electrolyte, wherein the anode contains a controlled release anode composition that includes at least a first anode active material and at least a first controlled release agent in physical contact thereto for tentatively isolating the first anode active material from the electrolyte in the beginning of a cell operation for a delayed reaction of the first anode active material. Preferably, the anode further contains an initial-stage anode active material in direct contact with the electrolyte. Such a controlled release anode can be used in a variety of electrochemical cells including metal-air batteries, such as a zinc-air battery, for an extended period of operating time.
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