Composition for a secondary battery cell

摘要

Composite electrode material for a rechargeable battery cell includes an electroactive material; and a polymeric binder including pendant carboxyl groups, characterized in that (i) the electroactive material includes one or more components selected from the group including an electroactive metal, an electroactive semi-metal, an electroactive ceramic material, an electroactive metalloid, an electroactive semi-conductor, an electroactive alloy of a metal, an electroactive alloy of a semi metal and an electroactive compound of a metal or a semi-metal, (ii) the polymeric binder has a molecular weight in the range 300,000 to 3,000,000 and (iii) 50 to 90% of the carboxyl groups of the polymeric binder are in the form of a metal ion carboxylate salt. A method of making a composite electrode material, an electrode, cells including electrodes and devices using such cells are also disclosed.

主权项

1. A composite electrode material for a rechargeable battery cell comprising:
a. an electroactive material; and b. a polymeric binder including pendant metal ion carboxylate groups and pendant free carboxyl groups,characterised in that (i) the electroactive material comprises one or more components selected from the group comprising an electroactive metal, an electroactive semi-metal, an electroactive ceramic material, an electroactive semi-conductor, and an electroactive compound of a metal or a semi-metal, (ii) the polymeric binder has a molecular weight in the range 300,000 to 3,000,000 and (iii) the ratio of the number of metal ion carboxylate groups of the polymeric binder to the sum of the number of metal ion carboxylate groups of the polymeric binder and free carboxyl groups of the polymeric binder is 0.50-0.90.