TY - JOUR
T1 - Synergistic Effects on Lithium Metal Batteries by Preferential Ionic Interactions in Concentrated Bisalt Electrolytes
AU - Pham, Thuy Duong
AU - Bin Faheem, Abdullah
AU - Chun, So Yeon
AU - Rho, Jung Rae
AU - Kwak, Kyungwon
AU - Lee, Kyung Koo
N1 - Funding Information:
T.D.P. and A.B.F. contributed equally to this work. This research was supported by the mid‐ and long‐term nuclear research and development program through the National Research Foundation of Korea (NRF‐2017M2A8A5014716) funded by the Korean Ministry of Science and ICT and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF‐2019R1A4A102980111 and NRF‐2020R1I1A3066503).
Funding Information:
T.D.P. and A.B.F. contributed equally to this work. This research was supported by the mid- and long-term nuclear research and development program through the National Research Foundation of Korea (NRF-2017M2A8A5014716) funded by the Korean Ministry of Science and ICT and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2019R1A4A102980111 and NRF-2020R1I1A3066503).
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2021/3/18
Y1 - 2021/3/18
N2 - Lithium metal batteries (LMBs) have the potential to deliver a greater specific capacity than any commercially used lithium battery. However, excessive dendrite growth and low Coulombic efficiencies (CEs) are major hurdles preventing the commercialization of LMBs. In this study, two different salts, lithium difluorophosphate (LiDFP) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), are chosen for use in concentrated electrolytic systems. By mixing salts with vastly different cation–anion interaction energies, the ion solvation structures in the electrolyte can be modulated to enhance the physical/electrochemical properties and suppress Li dendrite growth in LMBs. Among the investigated electrolyte systems, 2.2 m LiDFP + 1.23 m LiTFSI in 1,2-dimethoxyethane is proposed as a highly promising electrolyte system because of its high conductivity (6.57 mS cm−1), CE (98.3%), and the formation of an extremely stable solid–electrolyte interface layer. The bisalt electrolyte presented herein, as well as the associated concepts, provide a new avenue toward commercial LMBs.
AB - Lithium metal batteries (LMBs) have the potential to deliver a greater specific capacity than any commercially used lithium battery. However, excessive dendrite growth and low Coulombic efficiencies (CEs) are major hurdles preventing the commercialization of LMBs. In this study, two different salts, lithium difluorophosphate (LiDFP) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), are chosen for use in concentrated electrolytic systems. By mixing salts with vastly different cation–anion interaction energies, the ion solvation structures in the electrolyte can be modulated to enhance the physical/electrochemical properties and suppress Li dendrite growth in LMBs. Among the investigated electrolyte systems, 2.2 m LiDFP + 1.23 m LiTFSI in 1,2-dimethoxyethane is proposed as a highly promising electrolyte system because of its high conductivity (6.57 mS cm−1), CE (98.3%), and the formation of an extremely stable solid–electrolyte interface layer. The bisalt electrolyte presented herein, as well as the associated concepts, provide a new avenue toward commercial LMBs.
KW - bisalt electrolytes
KW - concentrated electrolytes
KW - high ionic conductivity
KW - lithium dendrites
KW - lithium metal batteries
KW - preferential ionic interactions
UR - http://www.scopus.com/inward/record.url?scp=85100741157&partnerID=8YFLogxK
U2 - 10.1002/aenm.202003520
DO - 10.1002/aenm.202003520
M3 - Article
AN - SCOPUS:85100741157
SN - 1614-6832
VL - 11
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 11
M1 - 2003520
ER -
