Electrolyte activatable lithium-ion rechargeable battery cell
First Claim
1. A rechargeable battery structure comprising a positive electrode element, a negative electrode element, and a separator element disposed therebetween characterized in thata) each of said elements comprises a flexible, self-supporting, polymeric matrix film composition substantially devoid of electrolytic salt;
- b) each said element is bonded to contiguous elements at its respective interfaces to form a unitary flexible laminate structure; and
c) said separator element film is substantially devoid of pores and comprises a composition initially comprising a polymeric material and 20 to 70% by weight of a compatible plasticizer therefor and from which composition at least a portion of said plasticizer has been removed, said separator element thereby being in a preconditioned state conducive to absorption of electrolytic solution.
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Accused Products
Abstract
Li-ion rechargeable battery cell electrode and electrolyte/separator elements formulated as layers of plasticized polymeric matrix compositions are laminated to form a unitary battery cell structure. The structure may be stored indefinitely, since it is essentially devoid of electrolyte solution which typically comprises a moisture-sensitive lithium salt. Prior to the battery'"'"'s being put into service, the plasticizer of the polymeric composition is removed by leaching with a selective solvent and is replaced with a lithium salt electrolyte solution by simple imbibition. The battery thus activated may then be charged and recharged in the usual manner.
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Citations
32 Claims
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1. A rechargeable battery structure comprising a positive electrode element, a negative electrode element, and a separator element disposed therebetween characterized in that
a) each of said elements comprises a flexible, self-supporting, polymeric matrix film composition substantially devoid of electrolytic salt; -
b) each said element is bonded to contiguous elements at its respective interfaces to form a unitary flexible laminate structure; and c) said separator element film is substantially devoid of pores and comprises a composition initially comprising a polymeric material and 20 to 70% by weight of a compatible plasticizer therefor and from which composition at least a portion of said plasticizer has been removed, said separator element thereby being in a preconditioned state conducive to absorption of electrolytic solution. - View Dependent Claims (2, 14)
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3. A rechargeable battery structure comprising a positive electrode element, a negative electrode element, and a separator element disposed therebetween characterized in that
a) each of said elements comprises a flexible, self-supporting, polymeric matrix film composition; -
b) each said element is bonded to contiguous elements at its respective interfaces to form a unitary flexible laminate structure; and c) said separator element composition comprises a copolymer of vinylidene fluoride with 8 to 25% by weight hexafluoropropylene and has homogeneously distributed therein 20 to 70% by weight of a compatible organic plasticizer for said copolymer. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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15. A rechargeable battery structure comprising, in sequence, a positive current collector element, a positive electrode element, a separator element, a negative electrode element, and a negative current collector element characterized in that
a) each of said collector elements comprises a flexible electrically-conductive foil, b) each of the others of said elements comprises a flexible, self-supporting, polymeric matrix film composition substantially devoid of electrolytic salt; -
c) each said element is bonded to contiguous elements at its respective interfaces to form a unitary flexible laminate structure; and d) said separator element film is substantially devoid of pores and comprises a composition initially comprising a polymeric material and 20 to 70% by weight of a compatible plasticizer therefor and from which composition at least a portion of said plasticizer has been removed, said separator element thereby being in a preconditioned state conducive to absorption of electrolytic solution. - View Dependent Claims (16, 18, 19, 20)
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17. A rechargeable battery structure comprising, in sequence, a positive current collector element, a positive electrode element, a separator element, a negative electrode element, and a negative current collector element characterized in that
a) each of said collector elements comprises a flexible electrically-conductive foil, b) each of the others of said elements comprises a flexible, self-supporting, polymeric matrix film composition; -
c) each said element is bonded to contiguous elements at its respective interfaces to form a unitary flexible laminate structure; and d) said separator element composition comprises a copolymer of vinylidene fluoride with 8 to 25% by weight hexafluoropropylene and has homogeneously distributed therein 20 to 70% by weight of a compatible organic plasticizer for said copolymer. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification