Lightweight battery electrode and method of making it
First Claim
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1. A process for producing a lightweight electrode grid comprising:
- A. compressing a mat of dense graphite fibers to a desired thickness;
B. heating the compressed mat of dense graphite fibers to a temperature at which Ni(CO)4 decomposes;
C. exposing the heated, compressed mat of graphite fibers to Ni(CO)4 gas which is at a temperature above the vaporization temperature of Ni(CO)4 but below the decomposition temperature of Ni(CO)4,wherein the Ni(CO)4 decomposes when it contacts the heated graphite fiber mat and deposits nickel metal on the graphite fiber surfaces;
D. removing the heated graphite fiber mat from the Ni(CO)4 gas when the desired thickness of nickel metal coating has been produced on the graphite fiber mat to bond the graphite fibers together; and
E. removing the external compressive forces from the nickel metal coated graphite fiber mat electrode grid.
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Abstract
A process for producing a lightweight electrode grid by exposing a compred, heated mat of dense graphite fibers to Ni(CO)4 gas wherein the Ni(CO)4 decomposes upon contact with the graphite fibers depositing a nickel metal coating on the graphite fibers which strongly bonds the fibers together to form a compressed mat or grid of nickel metal coated fibers.
18 Citations
13 Claims
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1. A process for producing a lightweight electrode grid comprising:
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A. compressing a mat of dense graphite fibers to a desired thickness; B. heating the compressed mat of dense graphite fibers to a temperature at which Ni(CO)4 decomposes; C. exposing the heated, compressed mat of graphite fibers to Ni(CO)4 gas which is at a temperature above the vaporization temperature of Ni(CO)4 but below the decomposition temperature of Ni(CO)4, wherein the Ni(CO)4 decomposes when it contacts the heated graphite fiber mat and deposits nickel metal on the graphite fiber surfaces; D. removing the heated graphite fiber mat from the Ni(CO)4 gas when the desired thickness of nickel metal coating has been produced on the graphite fiber mat to bond the graphite fibers together; and E. removing the external compressive forces from the nickel metal coated graphite fiber mat electrode grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A lightweight electrode grid comprising:
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A. a mat of dense graphite fibers which is compressed such that portions of the graphite surfaces of the graphite fibers are pressed directly against portions of the graphite surfaces of other graphite fibers, and B. a nickel metal coating on the mat which coats the exposed portions of the graphite surfaces of the graphite fibers and bonds the graphite fibers together to maintain the compression of the mat. - View Dependent Claims (11, 12, 13)
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Specification
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Current Assigneethe united states of america as represented by the secretary of the navy
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Original Assigneethe united states of america as represented by the secretary of the navy
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InventorsFerrando, William A., Divecha, Amarnath P.
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Primary Examiner(s)Skapars, Anthony
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Application NumberUS08/087,002Time in Patent Office489 DaysField of Search29/2, 29/623.5, 264/56, 264/105, 264/126, 264/258, 427/229, 427/237, 427/250, 427/331, 427/212, 427/252, 429/235, 429/245, 428/367, 428/375, 428/378, 428/389US Class Current429/245CPC Class CodesC22C 49/14 characterised by the fibres...C23C 16/045 Coating cavities or hollow ...C23C 16/16 from metal carbonyl compoundsH01M 4/80 Porous plates, e.g. sintere...Y02E 60/10 Energy storage using batteriesY10T 29/10 Battery-grid makingY10T 29/49115 including coating or impreg...Y10T 428/2918 including free carbon or ca...
