BINDER FOR A SECONDARY BATTERY CELL
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Abstract
A binder composition for inclusion in a composite material used in the formation of an electrode for inclusion in a secondary battery is provided. The binder composition comprises a metai ion sait of a carboxyiic acid of a poiymer or a copolymer, wherein the polymer or copolymer includes as a substituent one or more carboxyl comprising groups derived from a carboxyl comprising monomer unit selected from the group consisting an acrylic acid, an acrylic acid derivative, a maleic acid, a maleic acid derivative, a maleic anhydride and a maleic anhydride derivative, characterised in that 80 to 20% of the carboxyl groups are derived from an acrylic acid, an acrylic acid derivative, a maleic acid or a maleic acid derivative and 20 to 80% of the carboxyl groups are derived from maleic anhydride or a maleic anhydride derivative, but excluding lithium polyethylene-alt-maleic anhydride and lithium and sodium poly(maleic acid-co- acrylic acid). Composite electrode materials, electrode mixes, electrodes and electrochemical cells including the binder are provided.
30 Citations
56 Claims
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1-38. -38. (canceled)
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39. A composite electrode material comprising an electroactive material and a binder, wherein
the electroactive material comprises one or more of silicon, tin, graphite, hard carbon, gallium, germanium, an electroactive ceramic material, a transition metal oxide, a chalconide, alloys or mixtures thereof; - and
the binder comprises a metal ion salt of a polymer consisting (1) of monomer unit selected from acrylic acid or an acrylic acid derivative and (2) a monomer unit selected from maleic acid or a maleic acid derivative; wherein (i) the binder consists 0 to 80% of an acrylic acid or acrylic acid derivative and 20 to 100% of a maleic acid or a maleic acid derivative; (ii) the metal ion is selected from one or both of sodium and potassium. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification