期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 169, 期 12, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/acaad1
关键词
-
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) through Japan Society for the Promotion of Science (JSPS)
- [21H04700]
Water-acetonitrile hybrid electrolyte with high concentration of LiTFSI and LiFSI salts is studied for high potential and large capacity dual-ion battery. The hybrid electrolyte shows wide electrochemical stability window and addition of acetonitrile enhances solvation structure of water to lithium ion, improving battery performance.
Water-acetonitrile (AN) hybrid electrolyte with high concentration of bis(trifluoromethanesulfonyl) imide (LiTFSI) and Lithium bis(fluorosulfonyl) imide (LiFSI) (LiTFSI-LiFSI=3:1, molar ratio) supporting salts are studied for the high potential and large capacity rechargeable dual-ion battery. Water-acetonitrile hybrid electrolyte (WA) shows a wide electrochemical stability window of 3.1 V in 20 m aqueous electrolyte and 3.6 V in 20 m 9LiFSI-1LiTFSI in water: AN=1:3 molar ratio electrolyte. In particular, high oxidation potential, which can be assigned to the strong solvated ionic cluster formed between AN, water and LiTFSI-LiFSI supporting salts. The dual-ion battery is assembled using the graphitic carbon (KS6) and the activated carbon (AC) as cathode and anode, respectively, and 20 m LiTFSI-LiFSI in hybrid AN-water as electrolyte. It is found that the reasonably large capacity, coulombic efficiency and cycle stability were achieved. The KS6/AC cell shows 86 mAh g(-1) at the initial cycle and 50 mAh g(-1) at 100th cycle in a voltage range of 0-3.25 V, and the average coulombic efficiency of 85% is sustained over 200 cycles. The solvated structure of water to Li+ is strengthened by addition of AN from ATR-IR and NMR spectrums analysis and this change in the solvated structure is the main reason for the increased performance of the aqueous dual-ion battery.
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