TY - JOUR
T1 - Solvated Structure of Hybrid Tetraglyme-Aqueous Electrolyte Dissolving High-Concentration LiTFSI-LiFSI for Dual-Ion Battery
AU - Yang, Dengyao
AU - Li, Huan
AU - Shen, Xiaofeng
AU - Watanabe, Motonori
AU - Ishihara, Tatsumi
N1 - Funding Information:
This study was financially supported by Grant‐in‐Aid for Scientific Research (A), No. 21H04700 from The Ministry of Education, Culture, Sports, Science and Technology (MEXT) through Japan Society for the Promotion of Science (JSPS).
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022
Y1 - 2022
N2 - The solvated structure of a highly concentrated hybrid tetraglyme (G4)-water electrolyte was studied for an increasing cycle stability and performance of a KS6 used dual-ion battery. Hybrid solvent of G4 and water with a weight ratio of 2 to 8 was able to dissolve 9LiFSI-1LiTFSI supporting salts up to 37 mol kg−1 (37 mol kg−1 G2W8). In spite of such high concentration of supporting salts, reasonable charge and discharge performance of dual-ion battery (discharge capacity of ≈40 mAh g−1 and coulombic efficiency of 90 %) were exhibited over 300 cycles. This was attributed to the decreased hydrogen evolution reaction (HER) potential to −1.05 V vs. Ag/AgCl by addition of G4. From Fourier-transform infrared, nuclear magnetic resonance, and Raman spectroscopies, G4 molecules were more strongly coordinated to Li+ to form ion pairs of [Li(G4)x(H2O)y]+ complex in hybrid G4-water electrolyte. Co-intercalation of bis(trifluoromethanesulfonyl)imide (TFSI−) and bis(fluorosulfonyl)imide (FSI−) into graphitic carbon KS6 cathode was confirmed in hybrid aqueous electrolyte.
AB - The solvated structure of a highly concentrated hybrid tetraglyme (G4)-water electrolyte was studied for an increasing cycle stability and performance of a KS6 used dual-ion battery. Hybrid solvent of G4 and water with a weight ratio of 2 to 8 was able to dissolve 9LiFSI-1LiTFSI supporting salts up to 37 mol kg−1 (37 mol kg−1 G2W8). In spite of such high concentration of supporting salts, reasonable charge and discharge performance of dual-ion battery (discharge capacity of ≈40 mAh g−1 and coulombic efficiency of 90 %) were exhibited over 300 cycles. This was attributed to the decreased hydrogen evolution reaction (HER) potential to −1.05 V vs. Ag/AgCl by addition of G4. From Fourier-transform infrared, nuclear magnetic resonance, and Raman spectroscopies, G4 molecules were more strongly coordinated to Li+ to form ion pairs of [Li(G4)x(H2O)y]+ complex in hybrid G4-water electrolyte. Co-intercalation of bis(trifluoromethanesulfonyl)imide (TFSI−) and bis(fluorosulfonyl)imide (FSI−) into graphitic carbon KS6 cathode was confirmed in hybrid aqueous electrolyte.
UR - http://www.scopus.com/inward/record.url?scp=85143513844&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85143513844&partnerID=8YFLogxK
U2 - 10.1002/cssc.202201805
DO - 10.1002/cssc.202201805
M3 - Article
AN - SCOPUS:85143513844
JO - ChemSusChem
JF - ChemSusChem
SN - 1864-5631
ER -