(EP840389-A1)      An electrochemical cell comprises: (a) an anode of an anode active material, (b) a cathode of a cathode active material and (c) an electrolyte solution which activates the anode and the cathode. Materials (a) and (b) are present in an anode-to-cathode capacity ratio of about 1.03. The electrolyte-to-cathode weight ratio is about 0.94-0.96.    Preferably the cathode active material contains a fluorinated carbon, preferably in amount 80-95 wt.% with a balancing amount of a binder and/or a conductive additive. The binder is a fluoro-resin powder and the conductive additive is carbon, graphite powder, acetylene black, Ti, Al, Ni and/or stainless steel powder. The cathode may include a current collector of Ti, stainless steel, Ta, Pt or Au which may itself be provided with a layer of carbonaceous paint.    USE -   The cell is particularly used as a power source for an implantable medical device.    ADVANTAGE -   The cell shows an improvement of about 6.7% in terms of volumetric energy density and about 11.9% in terms of gravimetric energy density, compared with previous Li/CFx cells.    (JP10144354-A)      An electrochemical cell comprises: (a) an anode of an anode active material, (b) a cathode of a cathode active material and (c) an electrolyte solution which activates the anode and the cathode. Materials (a) and (b) are present in an anode-to-cathode capacity ratio of about 1.03. The electrolyte-to-cathode weight ratio is about 0.94-0.96.    Preferably the cathode active material contains a fluorinated carbon, preferably in amount 80-95 wt.% with a balancing amount of a binder and/or a conductive additive. The binder is a fluoro-resin powder and the conductive additive is carbon, graphite powder, acetylene black, Ti, Al, Ni and/or stainless steel powder. The cathode may include a current collector of Ti, stainless steel, Ta, Pt or Au which may itself be provided with a layer of carbonaceous paint.    USE -   The cell is particularly used as a power source for an implantable medical device.    ADVANTAGE -   The cell shows an improvement of about 6.7% in terms of volumetric energy density and about 11.9% in terms of gravimetric energy density, compared with previous Li/CFx cells.