(EN) The invention relates to a silica composite material, a preparation method thereof, a negative electrode material and a lithium ion battery. The silicon-oxygen composite material comprises an inner core and a carbon layer formed on the surface of the inner core, the inner core comprises a lithium-containing compound and a non-metal silicon-containing material, the non-metal silicon-containing material comprises at least one of nanometer silicon and silicon oxide, and the non-metal silicon-containing material is dispersed in the lithium-containing compound; and the size D10 of the silica composite material is 3.0-8.2 [mu]m. According to the invention, the particle size D10 of the silicon-oxygen composite material is controlled at 3.0-8.2 [mu]m, so that on one hand, the pre-lithiation uniformity can be improved, no nano silicon is exposed on the particle surface, and expected first-effect improvement and good cycling stability performance are obtained; on the other hand, proper electron and ion conduction paths are achieved, the internal impedance of particles is small, and the rate performance and the cycle performance of the material are improved.
(ZH) 本发明涉及一种硅氧复合材料、其制备方法、负极材料及锂离子电池。所述硅氧复合材料包括内核和形成于所述内核表面的碳层,所述内核包括含锂化合物和非金属含硅材料,所述非金属含硅材料包括纳米硅及硅氧化物中的至少一种,所述非金属含硅材料分散于所述含锂化合物中;所述硅氧复合材料的尺寸D10为3.0μm~8.2μm。本发明通过将硅氧复合材料的粒径D10控制在3.0μm~8.2μm之间,一方面可以提升预锂均匀性,没有纳米硅暴露在颗粒表面,获得预期的首效提升及良好的循环稳定性能;另一方面具有合适的电子、离子传导路径,颗粒内部阻抗小,提升材料的倍率性能和循环性能。