Silicon has been considered as a promising anode material for the next generation of lithium-ion batteries due to its high specific capacity. Its huge volume expansion during the alloying reaction with lithium spoils the stability of the interface between electrode and electrolyte, resulting in capacity degradation. Herein, we synthesized a novel hollow structured silicon material with interior space for accumulating the volume change during the lithiation. The as-prepared material shows excellent cycling stability, with a reversible capacity of ∼1650 m Ah g(-1) after 100 cycles, corresponding to 92% retention. The electrochemical impedance spectroscopy and differential scanning calorimetry were carried out to monitor the growth of SEI film, and the results confirm the stable solid electrolyte interphase film on the surface of hollow structured silicon.

A novel porous Si/C composite is designed and synthesized to improve coulombic efficiency and cycle performance. Reversible capacity is more than 850 mA h g À1 with high coulombic efficiency of 99.5% in 200 cycles without destruction of the porous structure, aggregation of nanosilicon particles and swelling of the SEI film.