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Multi-scale Design of Si Anodes for Fast-charging Battery
류재건,박수진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Si anodes are expected to potentially reduce the weight of battery packs mounted on the electric vehicles as well as to extend the driving mile range with their high capacity while the chronic challenge of uncontrollable volume change of Si anodes has not been clearly addressed yet. Under this situation, charging the batteries in a few minutes seems to be impossible with electronically insulating Si materials. Herein, we demonstrate multi-scale solutions to above concerns by realizing the interconnected Si nanostructures as a proof-of-concept via a chemical vapor decomposition method and quasi-metallic bulk Si through the low-temperature reduction process in a scalable manner. Such original designs of Si anodes enable stable operation of Li-ion cells under near-practical conditions to give promise of Si-based fast-charging and high energy density battery.
Intertwining porous silicon with conducting polymer for high-efficiency stable Li-ion battery anodes
류재건,박수진,홍동기,신성희 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.3
Porous silicon anodes have been extensively investigated for the high-performance lithium-ion battery, owing to their high capacity and structural robustness as dominantly incorporated with conductive carbon sheath. However, the typical high-temperature annealing process for carbon coating induces the collapse of pre-engineered pores and limits the full utilization of porous structures. In this work, porous silicon flake intertwined with doped polyaniline was prepared via redox-transmetalation reaction followed by a wet coating process of conducting polymer. The proposed method eliminates the risk of pore collapse and utilizes the conductive network without compromising the porous structure. As a result, the prepared composite consisting of porous silicon flake and doped polyaniline shows an extended battery cycle life, reduced electrode swelling, and increased efficiency.