Park, Seong-Jin Hwang, Jang-Yeon Yoon, Chong S. Jung, Hun-Gi Sun, Yang-Kook 2024-01-19T22:34:06Z 2024-01-19T22:34:06Z 2021-09-03 2018-05-30 1944-8244 https://pubs.kist.re.kr/handle/201004/121355 Lithium (Li) metals have been considered most promising candidates as an anode to increase the energy density of Li-ion batteries because of their ultrahigh specific capacity (3860 mA h g(-1)) and lowest redox potential (-3.040 V vs standard hydrogen electrode). However, unstable dendritic electrodeposition, low Coulombic efficiency, and infinite volume changes severely hinder their practical uses. Herein, we report that ethyl methyl carbonate (EMC)- and fluoroethylene carbonate (FEC)-based electrolytes significantly enhance the energy density and cycling stability of Li-metal batteries (LMBs). In LMBs, using commercialized Ni-rich Li[Ni0.6Co0.2Mn0.2]O-2 (NCM622) and 1 M LiPF6 in EMC/FEC = 3:1 electrolyte exhibits a high initial capacity of 1.8 mA h cm(-2) with superior cycling stability and high Coulombic efficiency above 99.8% for 500 cycles while delivering a unprecedented energy density. The present work also highlights a significant improvement in scaled-up pouch-type Li/NCM622 cells. Moreover, the postmortem characterization of the cycled cathodes, separators, and Li-metal anodes collected from the pouch-type Li/NCM622 cells helped identifying the improvement or degradation mechanisms behind the observed electrochemical cycling. English American Chemical Society FLUOROETHYLENE CARBONATE ELECTROCHEMICAL PROPERTIES ION BATTERIES LI ANODE POLYSULFIDE DEPOSITION CATHODES SOLVENT Stabilization of Lithium-Metal Batteries Based on the in Situ Formation of a Stable Solid Electrolyte Interphase Layer Article 10.1021/acsami.8b04592 1 ACS Applied Materials & Interfaces, v.10, no.21, pp.17985 - 17993 ACS Applied Materials & Interfaces 10 21 17985 17993 scie scopus 000434101200049 2-s2.0-85046532270 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article FLUOROETHYLENE CARBONATE ELECTROCHEMICAL PROPERTIES ION BATTERIES LI ANODE POLYSULFIDE DEPOSITION CATHODES SOLVENT Li-metal battery high-energy density NCM 622 fluoroethylene carbonate LiF-rich SEI layer