ORALS

SESSION: BatteryMonAM-R9	5th Intl. Symp. on Sustainable Secondary Battery Manufacturing and Recycling
Mon Nov, 5 2018 / Room: Asian (60/3rd)
Session Chairs: Vasant Kumar; Miles Freeman; Session Monitor: TBA

12:35: [BatteryMonAM04] Invited
Development of Nanostructured Electrode Materials for High Performance Secondary Batteries Using Ammonium Fluoride
Jinyoung Chun¹ ; ¹Korea Institute of Ceramic Engineering & Technology (KICET), Jinju, Republic of South Korea;
Paper Id: 371 [Abstract]

The development of advanced electrode materials for secondary Li batteries is essential to meet the increased energy demands posed by portable electronic devices and the rapid growth of electrical vehicles and energy storage systems.[1] In order to replace the intercalation reaction-based materials that have capacity limitations, many researchers have focused on new electrode materials reacting through conversion or alloying reactions, which can take up multiple Li-ions per unit formula.[2] In this study, using ammonium fluoride (NH₄F), we developed a new synthetic route to fabricate metal fluoride (MF_x) nanocomposites for conversion reaction-based high capacity cathodes and nanostructured silicon (Si) for alloying reaction-based high capacity anodes. At first, we discovered that various anhydrous MF_x can be obtained through simple heat treatment of metal precursors with NH₄F under an inert atmosphere. Based on this process, MF_x/mesoporous carbon nanocomposites were successfully synthesized.[3] From the reaction mechanism of this synthetic method, we expected that residual impurities in the raw Si materials, such as SiO₂, could be easily removed using NH₄F. Interestingly, the reaction of raw Si materials with NH₄F not only removed residual SiO₂, but also generated nanopores on Si. When used as electrodes in Li batteries, the MF_x nanocomposites and nanostructured Si showed noticeable improvements in electrochemical performance. It is expected that this study will motivate further research into the synthesis of advanced electrode materials for secondary batteries using NH₄F.

References:
[1] J. B. Goodenough, Y. Kim, Chem. Mater., 2010, 22, 587-603\n[2] J. Cabana et al., Adv. Mater., 2010, 22, E170-E192\n[3] J. Chun et al., ACS Appl. Mater. Interfaces, 2016, 8, 35180-35190