| 초록 |
Improved materials for next-generation energy storage devices are required to high energy density and long-term cycling stability. Silicon has remarkable attention as a promising anode material for Li-ion batteries, but it suffers from poor cyclic stability and low electrical conductivity. In order to overcome shortcomings, an approach using alloying Si with various metal sources has been used. However, bulk nanocomposite which Si alloys and Metal oxide are synthesized via ball milling process suffers from structure instability by large volumetric expansion. By introducing a porous structure or hollow structures, it is possible to compensate for the structural weakness and facilitate ion access to electrode matrix by providing a sufficient ion transport path. In this work, we propose Si nanoparticles encapsulated by multi-shelled metal oxide, with yolk-shell structure, which show large reversible capacity, excellent cyclic stability and good rate capability for high-performance LIBs. |
