Structure‐Controllable Binary Nanoporous‐Silicon/Antimony Alloy as Anode for High‐Performance Lithium‐Ion Batteries

A binary nanoporous‐SixSb alloy is prepared successfully as electrode for lithium‐ion batteries (LIBs) by a one‐step chemical dealloying method. The sample morphology can be controlled by adjusting the content of Al and the molar ratio of Si and Sb in the alloy precursors. Structural and morphological characterizations reveal the presence of uniformly‐distributed nanopores which can effectively accommodate the volume change and provide massive diffusion channels for Li‐ions during charging/discharging. Electrochemical experiments show that the nanoporous Si15Sb15 (np‐Si15Sb15) anode can deliver excellent performance with a specific capacity of 647.40 mAh g−1 after 90 cycles at a current density of 100 mA g−1. This simple approach may be further extended to the design of novel nanoporous materials, providing a guideline for mass production of high‐performance electrochemical energy storage devices. An alloy speaks volumes: structure‐controllable nanoporous SixSb alloys are prepared by a one‐step chemical dealloying method. When tested as anode material for lithium‐ion batteries, the np‐SixSb alloy showed high reversible capacity, effectively accommodating volume change and providing diffusion channels for Li‐ions during charging/discharging.