Abstract: A composition comprising a first particulate electroactive material, a particulate graphite material and a binder, wherein at least 50% of the total volume of each said particulate materials is made up of particles having a particle size D50 and wherein a ratio of electroactive material D50 particle size:graphite D50 particle size is up to 4.5:1.

Abstract: A multilayer electrode suitable for use in a secondary battery is disclosed. The major active component of one layer is different to a major active component of an adjacent layer. The use of layered electrodes improves both the capacity retention and cycle life of batteries including such layered electrodes.

Abstract: Disclosed are a composite electrode material for a rechargeable battery; a method of making a composite electrode material; an electrode including the composite electrode material; cells including such electrodes; and devices including the cells. A composite electrode material for a rechargeable battery cell includes an electroactive material; and a polymeric binder including pendant carboxyl groups. 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. The polymeric binder has a molecular weight in the range 300,000 to 3,000,000. 40 to 90% of the carboxyl groups of the binder are in the form of a metal ion carboxylate salt.

Abstract: A composition comprising at least 50 weight % of a first particulate electroactive material and 3-15 weight % of a carbon additives mixture comprising elongate carbon nanostructures and carbon black, wherein: the elongate carbon nanostructures comprise at least a first elongate carbon nanostructure material and a different second elongate carbon nanostructure material; and the elongate carbon nanostructures: carbon black weight ratio is in the range 3:1 to 20:1.

Abstract: A multilayer electrode suitable for use in a secondary battery is disclosed. The major active component of one layer is different to a major active component of an adjacent layer. The use of layered electrodes improves both the capacity retention and cycle life of batteries including such layered electrodes.

Abstract: A composition comprising a first particulate electroactive material, a particulate graphite material and a binder, wherein at least 50% of the total volume of each said particulate materials is made up of particles having a particle size D50 and wherein a ratio of electroactive material D50 particle size:graphite D50 particle size is up to 4.5:1.

Abstract: A composition comprising at least 50 weight % of a first particulate electroactive material and 3-15 weight % of a carbon additives mixture comprising elongate carbon nanostructures and carbon black, wherein: the elongate carbon nanostructures comprise at least a first elongate carbon nanostructure material and a different second elongate carbon nanostructure material; and the elongate carbon nanostructures:carbon black weight ratio is in the range 3:1 to 20:1.

Abstract: Disclosed are a composite electrode material for a rechargeable battery; a method of making a composite electrode material; an electrode including the composite electrode material; cells including such electrodes; and devices including the cells. A composite electrode material for a rechargeable battery cell includes an electroactive material; and a polymeric binder including pendant carboxyl groups. 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. The polymeric binder has a molecular weight in the range 300,000 to 3,000,000. 40 to 90% of the carboxyl groups of the binder are in the form of a metal ion carboxylate salt.