Preparation of copper silver vanadium oxide from γ-phase SVO starting material
AssigneeWilson Greatbatch Technologies, Inc.
InventorsRandolph Leising, Esther S. Takeuchi
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Abstract
The current invention relates to the preparation of an improved cathode active material for non-aqueous lithium electrochemical cell. In particular, the cathode active material comprises ε-phase silver vanadium oxide prepared by using a γ-phase silver vanadium oxide starting material. The reaction of γ-phase SVO with a silver salt produces the novel ε-phase SVO possessing a lower surface area than ε-phase SVO produced from vanadium oxide (V2O5) and a similar silver salt as starting materials. Consequently, the low surface area ε-phase SVO material provides an advantage in greater long-term stability in pulse dischargeable cells.
Claims8
A cathode for an electrochemical cell, the cathode comprising an electrode active material characterized as prepared from γ-phase silver vanadium oxide having the formula Ag1.2V3O8.1 mixed with CuO to form a reaction mixture heated to at least one reaction temperature in an oxidizing atmosphere to produce Cu0.2Ag0.8V2O5.6 having a BET surface area of about 0.31 m2/gram.
A nonaqueous electrochemical cell, comprising:
- a) an anode;
- b) a cathode containing an electrode active material characterized as having been prepared from a mixture of γ-phase silver vanadium oxide having the formula Ag1.2V3O8.1 and CuO forming a reaction mixture heated to at least one reaction temperature in an oxidizing atmosphere to produce CU0.2Ag0.8V2O5.6 having a BET surface area of about 0.31 m2/gram;
- and
- c) a non-aqueous electrolyte activating the anode and the cathode;
- and
- d) a separator material electrically insulating the anode from the cathode, and of a porosity to allow for electrolyte flow.
Dependencies are inferred from the claim text.