SILICON-BASED POWDER, ELECTRODE AND BATTERY COMPRISING SUCH A POWDER

Silicon-based powder for use in the negative electrode of a battery, whereby the silicon-based powder comprises silicon-based particles, whereby the silicon-based particles have a number-based particle size distribution having a d50, whereby the particle size of a particle is considered to be the largest dimension of said particle, whereby less than 8.0% of the particles have a size which is larger than twice the d50. Such a silicon based powder may be embedded in a matrix to form an active material powder. Preferably d5010 nm. The cycle efficiency of a negative electrode of a battery, made using such a powder, is much improved.