Greatbatch Ltd.

Paul W Krehl

Esther S Takeuchi

Hong Gan

Robert S Rubino

Marcus J Palazzo

Steven Davis

The prevention of lithium clusters from bridging between the negative and positive portions of a cell during discharge is described. This is done by providing a glass wool material at an intermediate location between the casing and anode current collector of a negative polarity and the cathode current collector and the terminal pin being of a positive polarity. Typically, a lithium ion concentration gradient sufficient to cause lithium cluster formation is induced by the high rate, intermittent discharge of a lithium/silver vanadium oxide (Li/SVO) cell. However, sufficient free electrolyte necessary for normal cell function is held in the relatively large pore volume throughout the extent of the glass wool material. Moreover, permeability within the glass wool material is tortuous, which effectively increases the distance between the negative and positive surfaces of the anode and cathode. This tortuosity effectively stops 'straight line' dendrite growth of lithium clusters between opposite polarity structures inside the casing.

Internal insulation design using porous material for an electrochemical cell

The current invention describes a lithium/carbon monofluoride (Li/CF) cell capable of delivering sufficient power to supply an ICD or similar demanding device. The cell exhibits the typical excellent long-term stability and predictability of the CFsystem, as well as its high energy density (greater than about 300 Ah/cc, greater than about 600 Wh/cc). Additionally, the cell is capable of delivering about 0.5 W/cc of cathode volume for greater than 5 seconds with a voltage above 1.70 V (FIG.). The following invention embodiments can be applied individually or in conjunction with each other.

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Clarence Center, NY, United States of America

Paul W Krehl