Porous Si can be synthesized from diverse silica (SiO₂) via magnesiothermic reduction technology and widely employed as potential anode material in lithium ion batteries. However, concerns regarding the influence of residual silicon oxide (SiO_x) component on resulted Si anode after reduction are still lacked. In this work, we intentionally fabricate a cauliflower-like silicon/silicon oxide (CF-Si/SiO_x) particles from highly porous SiO₂ spheres through insufficient magnesiothermic reduction, where residual SiO_x component and internal space play an important role in preventing the structural deformation of secondary bulk and restraining the expansion of Si phase. Moreover, the hierarchically structured CF-Si/SiO_x exhibits uniformly-dispersed channels, which can improve ion transport and accommodate large volume expansion, simultaneously. As a result, the CF-Si/SiO_x-700 anode shows excellent electrochemical performance with a specific capacity of ~1,400 mA·h·g⁻¹ and a capacity retention of 98% after 100 cycles at the current of 0.2 A·g⁻¹.

多孔硅可以通过氧化镁还原技术由多种二氧化硅（SiO ₂）合成，并广泛用作锂离子电池的潜在负极材料。但是，仍然缺乏关于还原后残留的氧化硅（SiO _x）成分对所得Si阳极的影响的担忧。在这项工作中，我们有意制造菜花状硅/氧化硅（CF硅/二氧化硅_X）从高度多孔的SiO颗粒_2个球体通过镁热还原不充分，在那里残留的SiO _X元素和内部空间在防止二次块体的结构变形和抑制Si相的膨胀方面起着重要作用。此外，分层结构的CF-Si / SiO _x具有均匀分散的通道，可以改善离子传输并同时适应大体积膨胀。结果，CF-Si / SiO _x -700阳极表现出优异的电化学性能，在0.2 A·g的电流下经过100次循环后的比容量为〜1,400 mA·h·g ^-1且容量保持率为98％。^-1。