Cathode current collector material for solid cathode cell
First Claim
1. In an electrochemical cell comprising a lithium anode, a solid cathode material used in conjunction with a metal cathode current collector, and an ionically conductive electrolyte solution operatively associated with said anode and cathode, wherein the improvement comprises a cathode current collector of a highly alloyed nickel-containing ferritic stainless steel material, said material providing high corrosion resistance particularly where elevated temperature storage and performance is required thereby increasing cell longevity, said material comprising, by weight:
- from about 27.0 percent to about 29.0 percent chromium;
from about 2.0 percent to about 3.0 percent molybdenum;
from about 3.0 percent to about 4.5 percent nickel;
the sum of carbon plus nitrogen in an amount less than or equal to 0.045 percent;
the sum of niobium plus zirconium in an amount of at least ten times the percent of carbon plus nitrogen; and
the remainder being iron.
7 Assignments
0 Petitions
Accused Products
Abstract
A highly alloyed nickel-containing ferritic stainless steel material for use as a cathode current collector for lithium solid cathode cells is provided. The material does not require costly melting practices and provides high corrosion resistance particularly where elevated temperature, 72° C. or higher, storage and performance is required relative to other cathode current collector materials thereby increasing cell longevity.
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Citations
11 Claims
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1. In an electrochemical cell comprising a lithium anode, a solid cathode material used in conjunction with a metal cathode current collector, and an ionically conductive electrolyte solution operatively associated with said anode and cathode, wherein the improvement comprises a cathode current collector of a highly alloyed nickel-containing ferritic stainless steel material, said material providing high corrosion resistance particularly where elevated temperature storage and performance is required thereby increasing cell longevity, said material comprising, by weight:
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from about 27.0 percent to about 29.0 percent chromium; from about 2.0 percent to about 3.0 percent molybdenum; from about 3.0 percent to about 4.5 percent nickel; the sum of carbon plus nitrogen in an amount less than or equal to 0.045 percent; the sum of niobium plus zirconium in an amount of at least ten times the percent of carbon plus nitrogen; and the remainder being iron. - View Dependent Claims (2, 3, 7, 8, 9, 10, 11)
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4. In an electrochemical cell comprising a lithium anode, a solid cathode material used in conjunction with a metal cathode current collector, and an ionically conductive electrolyte solution operatively associated with said anode and cathode, wherein the improvement comprises a cathode current collector of a highly alloyed nickel-containing ferritic stainless steel material, said material providing high corrosion resistance particularly where elevated temperature storage and performance is required thereby increasing cell longevity, said material comprising, by weight:
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from about 28.0 percent to about 30.0 percent chromium; from about 3.5 percent to about 4.2 percent molybdenum; from about 2.0 percent to about 2.5 percent nickel; the sum of carbon plus nitrogen in an amount less than or equal to 0.025 percent; and the remainder being iron. - View Dependent Claims (5, 6)
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Specification