Electroactive materials for metal ion batteries

The present invention relates to a particulate electroactive material consisting of a plurality of composite particles wherein the composite particles comprise a plurality of silicon nanoparticles dispersed within an electrically conductive carbon matrix. The particulate material comprises 40 to 65% by weight of silicon, at least 6% by weight and less than 20% by weight of oxygen, and the weight ratio of the total amount of oxygen and nitrogen to silicon is in the range of 0.1 to 0.45 and the weight ratio of carbon to silicon is in the range of 0.1 to 1. The particulate electroactive material may be used as an active component of an anode in a metal ion battery. 本发明涉及颗粒电活性材料，该颗粒电活性材料由多个复合粒子组成，其中所述复合粒子包含分散在导电碳基体内的多个硅纳米粒子。颗粒材料包含40至65重量％的硅、至少6重量％并且小于20％的氧，并且氧和氮的总量与硅的重量比在0.1至0.45的范围内并且碳与硅的重量比在0.1至1的范围内。所述颗粒电活性材料可用作金属离子电池中的阳极的活性组分。