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Surface Treatment Approaches to Improve Cycle Performance for Micro-patterned Li metal
유명현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Lithium (Li) metal has been considered as a promising anode material for next-generation Li secondary batteries for over five decades. Nevertheless, due to uncontrolled Li formation, so called Li dendrite, Li metal has been hindered for the successful implementation in a practical battery system. Recenltly, we demonstrated the effect of mechanical surface modification on the performance of Li metal foil electrodes in a systematic manner. Unfortunately, however, the surface-patterned Li metal still suffers from uncontrolled Li formation at high-current operating conditions. This consumes excess amounts of electrolytes during repeated cyclings, which severely degrade the cycle performance of surface-patterned Li metal. To improve this, we introduce surface treatment techniques such as protection layers and functional electrolyte additives for surface-patterned Li metal. Uncontrolled Li plating has been significantly inhibited, resulting in superior cycle performance improvement.
유명현,한영달,이제남,이동진,박정기 한국전기화학회 2008 한국전기화학회지 Vol.11 No.3
The multilayered membrane for lithium rechargeable batteries based on poly (vinylidene fluoride) (PVdF) is prepared with the coated layer containing nano-sized filler. The prepared membranes were subjected to studies of mechanical strength, morphology, interfacial stability, impedance spectroscopy, ionic conductivity, and cycle performance. The localized inorganic filler in the PVdF composite membrane rendered mechanical strength much reduced because of its low stretching ratio and it results in around half value of the mechanical strength of highly stretched PVdF membrane. In order to achieve high ionic conductivity and interfacial stability without sacrificing high mechanical strength, coating layer with nano-filler was newly introduced to PVdF membrane. The ionic conductivity of the coated membrane was 1.03 mS/cm, and the interface between the coating layer and PVdF membrane was stable when the membrane was immersed into liquid electrolyte. The discharge capacity of the cell based on nano-filler coated PVdF membrane was around 91% of the initial discharge capacity after 250 cycles, which is an improvement in cycle performance compared to the case for the non-coated PVdF membrane