Cryogenic grinding of tantalum for use in capacitor manufacture
AssigneeGreatbach Ltd.
InventorsDonald F. Kaiser, William C. Thiebolt, Jason T. Hahl
Life of this patent
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Abstract
An electrolytic capacitor comprising an anode comprised of cryogenically milled anode material is described. The cryogenic milling process prepares the active anode material for anode fabrication. The capacitor further comprises a casing of first and second casing members secured to each other to provide an enclosure. A feedthrough electrically insulated from the casing and from the casing and extending there from through a glass-to-metal seal, at least one anode electrically connected within the casing, a cathode, and an electrolyte. The cathode is of a cathode active material deposited on planar faces of the first and second casing members.
Claims29
A capacitor, which comprises:
- a) a casing comprising first and second casing members secured to each other;
- b) at least a first anode comprising a plurality of tantalum particles, the tantalum particles having an average diameter that ranges from about 1.25 μm to about 3 μm, and an average length that ranges from about 5 μm to about 25 μm;
- c) a cathode comprising a cathode active material;
- d) a separator disposed between the anode and the cathode housed inside the casing;
- and
- e) a working electrolyte contained within the casing and in physical contact with the cathode and the anode.
A capacitor, which comprises:
- a) a casing comprising first and second casing members secured to each other;
- b) an anode comprising a plurality of tantalum particles having a substantially monomial particle size distribution with an average diameter that ranges from about 1.25 μm to about 3 μm, and an average length that ranges from about 5 μm to about 25 μm;
- c) a cathode comprising a cathode active material;
- d) a separator disposed between the anode and the cathode housed inside the casing;
- and
- e) a working electrolyte contained within the casing and in physical contact with the cathode and the anode.
A capacitor, which comprises:
- a) a casing comprising first and second casing members secured to each other;
- b) an anode comprising a plurality of tantalum particles, the tantalum particles having:
- i) an average diameter that ranges from about 1.25 μm to about 3 μm;
- ii) an average length that ranges from about 5 μm to about 25 μm;
- iii) an iron content of less than about 10 parts per million;
- and
- iv) a hydrogen content of less than about 50 parts per million;
- c) a cathode comprising a cathode active material;
- d) a separator disposed between the anode and the cathode housed inside the casing;
- and
- e) a working electrolyte contained within the casing and in physical contact with the cathode and the anode.
Dependencies are inferred from the claim text.