Apparatus and method for fabricating cathode collectors for lithium/oxyhalide electrochemical cells

Abstract

An apparatus and method for fabricating continuous cathode collecters for use in lithium / thionyl chloride and lithium / sulfuryl chloride cells is described. The preferred electrically conductive material is acetylene black mixed with a polytetrafluroethylene (PTFE) binder in a dry, powderized form. The collector substrate is a nickel or stainless steel foil that has been expanded into a mesh or otherwise provided with perforations. A centering adjustment of the collector substrate controls loading of the electrically conductive mixture onto each side thereof. The dry, powdered electrically conductive mixture is then continuosly fed into the calender and formed into a collector structure by locking to itself through the collector substrate perforations before being cut to size.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to provisional application number 60 / 752,867, filed December 22, 2005. technical field [0003] The present application relates generally to the field of electrochemical cells, and more specifically, to lithium-containing cells with conductive counter-collectors fabricated by a novel continuous feed device. In general, it is disclosed that, for example, a conductive material having a carbonaceous chemistry can be easily pressed onto opposite major faces of a punched conductive current collector substrate without delamination or delamination. This makes the resulting carbon-containing laminates particularly suitable for use as cathode current collectors in lithium / oxyhalide cells. Background technique [0004] Lithium oxyhalide batteries are widely used in applications requiring high gravimetric and volumetric energy densities. Among the many sizes and chemistries available, cells can ...

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Problems solved by technology

An active co-solvent material is electrochemically active and therefore, acts as an active cathode material whereas an inactive co-solvent is electrochemically inactive and therefore, cannot act as an active cathode material

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