Silicon particles for anode materials of lithium ion batteries

Anode materials for lithium-ion batteries comprising:

• one or more binders,
• optionally graphite,
• optionally one or more further electrically conductive components,
• optionally one or more additives, and
• non-aggregated, spherical, non-porous silicon particles having average particle sizes of 1 to 10 μm and a silicon content of 97% to 99.8% by weight, wherein the silicon content is based on the total weight of the silicon particles minus any oxygen contents, the silicon is in elemental form, and wherein ≥80% of the silicon particles have an orthogonal axial ratio R of 0.60≤R≤1.0, wherein the orthogonal axial ratio R is the quotient of the two largest mutually orthogonal diameters through a silicon particle and the larger diameter forms the denominator and the smaller diameter forms the numerator of the quotient, as determined by SEM image.