Abstract
Silicon (Si) is the most promising candidate for next-generation anode material of lithium-ion batteries. However, its commercial application is impeded by the poor cycling stability caused by the pulverization. Herein, we draw inspiration from mountain protection mesh and design a micrometer-scale porous core–shell structure via the phase inversion. The porous Si core's cavity can accommodate the volume expansion during lithiation, while the external mesh-like coating, composed of porous polyacrylonitrile (PAN) and conductive carbon nanotubes (CNTs), effectively restrains the outward expansion of Si. The synergistic effect of these components effectively enhances cycling stability, resulting in a capacity of 907.56 mAh/g at 1.0 A/g after 500 cycles. This study offers a scalable and cost-effective approach for the practical application of Si.
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