서강대학교

초록/요약

The confinement and uniform dispersion of Si nanoparticles (NPs) in a cnoductive carbon matrix is a promising strategy to alleviated the problematic large volume change of high-capacity Si-based anodes during lithiation/delithiation cycles in lithium-ion batteries. In this paper, we introduced an inverse opal carbon (IOC) matrix for uniform Si NPs dispersion. allowed uniform . By simple mixing, uniform dispersion of Si NPs and large voids that surrounded the Si NPs are obtained in a macroporous, highly interconnected porous structure of IOCs. The Si NPs/IOC composite anode shown a specific capacity up to 1233 mAh/g with 40 wt% Si NPs content, which was 4.1 times higher than the IOC anode. The capacity retention over 50 cycles for the Si NPs/IOC anode (40 wt% Si NPs/IOC) was as high as 81%, whereas the Si NPs anode revealed only 48% retention. Also, the specific capacity was maintained up to 70% as the current density increased 20-fold. These enhancement of the capacity retention were attributed to the efficient alleviation of the Si volume change in the IOC structure and facile charge transport in and through the IOC matrix. We believe this simple geometry-derived approach for the dispersion of nanoparticles may be advantageous in the practical application of high-capacitive nanomaterials for next-generation lithium ion battery (LIB) development.