Abstract
Porous Si (PoSi) is regarded as one of the most promising Si-based anodes for next-generation lithium-ion batteries. Herein, we demonstrate the novel structure of Cu3Si-embedded three-dimensional porous Si synthesized by one-pot solid-state reaction between Mg2Si and CuO. The porous structure buffers the volume change and keeps structural stability. The embedded Cu3Si nanoparticles improve the electrical conductivity, reduce polarity and boost charges’ transfer. When used as anodes of lithium-ion batteries, the Cu3Si-embedded 3D PoSi expressed high Coulombic efficiency, good rate capability and enhanced cycling stability with a reversible charge capacity of ∼700 mAhg−1 after 200 cycles.
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