Method of forming a reactive metal anode having an edge seal
First Claim
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1. A method of forming a sealed reactive metal anode useful in an electrochemical cell comprising said anode, a cathode and an electrolyte in which said anode and cathode are in operation during operation of said cell, said method comprising the steps of:
- (a) providing an anode of said reactive metal, said anode defining a first surface which contacts said electrolyte and at least one additional surface at the perimeter of at least a portion of said first surface; and
,(b) coating said additional surface with a hydrophobic polymer which is substantially chemically inert with respect to said reactive metal and said electrolyte and wherein;
(i) the ratio of the flexural modulus to the flexural strength of said polymer is at least about 25;
(ii) the Izod impact value of said polymer is less than or equal to about 2.0 ft.-lb./in.; and
,(iii) the percent elongation of said polymer is less than or equal to about 20%, said first surface being substantially free of said hydrophobic polymer, and said coating step (b) being carried out in an atmosphere which is non-reactive with respect to said reactive metal.
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Abstract
An edge seal for a lithium or other consumable metal anode comprises a hydrophobic, chemically inert polymer coating having a high ratio of flexural modulus to flexural strength, a low Izod impact value, and low elongation properties. The seal is applied to the edge of the anode under an atmosphere of gas which is non-reactive with the anodic metal.
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Citations
16 Claims
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1. A method of forming a sealed reactive metal anode useful in an electrochemical cell comprising said anode, a cathode and an electrolyte in which said anode and cathode are in operation during operation of said cell, said method comprising the steps of:
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(a) providing an anode of said reactive metal, said anode defining a first surface which contacts said electrolyte and at least one additional surface at the perimeter of at least a portion of said first surface; and
,(b) coating said additional surface with a hydrophobic polymer which is substantially chemically inert with respect to said reactive metal and said electrolyte and wherein; (i) the ratio of the flexural modulus to the flexural strength of said polymer is at least about 25; (ii) the Izod impact value of said polymer is less than or equal to about 2.0 ft.-lb./in.; and
,(iii) the percent elongation of said polymer is less than or equal to about 20%, said first surface being substantially free of said hydrophobic polymer, and said coating step (b) being carried out in an atmosphere which is non-reactive with respect to said reactive metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification