TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The composition comprises at least one or two elongate nanostructure material. In the composition, a second elongate carbon nanostructure material has a mean average diameter of no more than 90 nm and optionally 40-90 nm. The composition further comprises carbon black. Preferred Components: The ratio of electroactive material D50 particle size to graphite D50 particle size is 2:1 or 2:1-4:1, optionally 3:1-4:1. The particulate electroactive material is a silicon-comprising material. The particulate electroactive material comprises particles having a particle core and electroactive pillars extending from the particle core. The pillars of the silicon comprising particles are silicon pillars. The core of the silicon comprises: silicon; n- or para-doped silicon, where the pillars are integral with the core. The particulate electroactive material is provided in an amount of at least 50 wt.%. The first elongate nanostructure has a mean average diameter of at least 100 nm. The weight ratio of first elongate nanostructure to second elongate nanostructure is 2.5:1-20:1. The elongate nanostructure materials have an aspect ratio of at least 50. The first and second carbon elongate nanostructure materials are carbon nanotubes and carbon nanofibers. The first carbon elongate nanostructure material is a nanofiber, and the second elongate carbon nanostructure material is a nanotube. The elongate carbon nanostructure materials are present at 0.1-15 wt.%. The elongate carbon nanostructure materials have a functionalized surface, optionally a surface functionalized with a nitrogen-containing group or an oxygen containing group. The graphite is present at 1-30 wt.% and optionally 1-20 wt.%. The graphite has a crystallite length (Lc) of at least 50 nm, and optionally at least 100 nm. The carbon black is present at least 0.5 wt.%, optionally less than 10 wt.%, and optionally less than 4 wt.%. EXAMPLE - No suitable example given.