Porous spherical silicon-based composite negative electrode material and preparation method thereof and battery

The invention provides a porous spherical silicon-based composite negative electrode material and a preparation method thereof and a battery. The porous spherical silicon-based composite negative electrode material comprises an inner core sintered body, a carbon deposit and a carbonization layer, wherein the inner core sintered body comprises mixed heat-treated silicon monoxide and silicon, the carbon deposit is deposited on the inner core sintered body to form deposited carbon-coated porous spherical particles, and the carbonization layer coats the peripheries of the deposited carbon-coated porous spherical particles. According to the invention, the volume expansion degree of the porous spherical silicon-based composite negative electrode material is relatively low, and the cycle performance, the specific capacity and the charge-discharge efficiency of the battery can be improved. 本申请提供一种多孔球形硅基复合负极材料及其制备方法、以及电池。上述的多孔球形硅基复合负极材料包括内核烧结体、碳沉积物和碳化层。内核烧结体包括混合热处理的氧化亚硅和硅。碳沉积物沉积于内核烧结体上形成沉积碳包覆多孔球形颗粒。碳化层包覆于沉积碳包覆多孔球形颗粒的外