배터리소재 연구실(Battery Materials Laboratory (BML))

Under harsh or abnormal operating conditions, current lithium-ion batteries (LIBs) with flammable liquid electrolytes suffer from significant performance degradation and are at risk of catching fire or exploding. All-solid-state batteries (ASSBs) constitute energy storage technology that can overcome the safety and reliability issues of LIBs. Furthermore, a bipolar design of ASSBs has the potential to increase the energy density, while reducing material and fabrication costs. The Li-metal anode has attracted much attention as an alternative to graphite because it can improve the energy density of batteries. However, its commercial viability is hindered by the uncontrollable growth of Li dendrites and large volume changes during repeated cycling. Considerable effort is being made to mitigate the dendritic growth of metallic Li, including metallic Li storage in three-dimensional (3D) framework electrodes. The 3D framework electrodes with large surface areas and high porosities have the ability to confine metallic Li within their porous architectures, which should result in reduced local (effective) current densities and increased tolerance to volume variation. Charging time is regarded as a critical factor influencing customer willingness to adopt electric vehicles; however, the realization of fast-charging LIBs with long cycle lifetimes is hindered by the uncontrollable plating of metallic Li on the graphite anode during high-rate charging. In addition to inducing a significant capacity loss during high-rate cycling, dendritic Li plating can cause short-circuiting and thus result in LIB ignition or even explosion. Furthermore, extensive efforts have been devoted to design and develop advanced cathode materials with high capacity and high operating voltages. In recent yea