TY - JOUR
T1 - Hexafluorophosphate-Bis(trifluoromethanesulfonyl)imide anion co-intercalation for increased performance of dual-carbon battery using mixed salt electrolyte
AU - Madrid Madrid, Jose C.
AU - Nakamura, Kotaro
AU - Inda, Keisuke
AU - Haneke, Lukas
AU - Heckmann, Andreas
AU - Frerichs, Joop Enno
AU - Hansen, Michael Ryan
AU - Placke, Tobias
AU - Winter, Martin
AU - Watanabe, Motonori
AU - Takagaki, Atsushi
AU - Akbay, Taner
AU - Ishihara, Tatsumi
N1 - Funding Information:
TI and TA are grateful for the support of the New Energy and Industrial Technology Development Organization (NEDO) Japan . The support of the International Institute for Carbon Neutral Energy Research (WPI−I 2 CNER) sponsored by MEXT is also acknowledged. The support by the Federal Ministry of Education and Research of Germany ( BMBF ) for funding of this work within the project “Dual-Carb” (03XP0118) is gratefully acknowledged. The support under the International Fellowship for Outstanding Researchers Programme ( TÜBİTAK 2232 ) of the Scientific and Technological Research Council of Turkey is also acknowledged.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - Co-intercalation of Hexafluorophosphate(PF6ˉ) and Bis(trifluoromethane sulfonyl)imide (TFSIˉ) anions as a result of the use of a mixed salt of LiPF6 and LiTFSI is studied for the increased performance of a dual-carbon battery (DCB). Unlike the fluorine- or the imide-based anions (e.g., PF6ˉ and TFSIˉ), the cluster formation between co-intercalated PF6ˉ and TFSIˉ in the positive electrode of a DCB results in achieving high discharge capacities with significantly increased cycle properties. A reversible discharge capacity of 85 mAh/g-cathode over 350 cycles with no significant degradation is presented. The Coulombic efficiency of almost 100% is reached after the initial 10 cycles and suitable rate property is also observed. F NMR analysis on graphitic carbon intercalated with PF6ˉ and TFSIˉ suggests the interaction between two anions and ratio of intercalated PF6− and TFSI− was changed by applied voltage, resulting in the increased stability of the intercalated structure which is also supported by the first principles calculations.
AB - Co-intercalation of Hexafluorophosphate(PF6ˉ) and Bis(trifluoromethane sulfonyl)imide (TFSIˉ) anions as a result of the use of a mixed salt of LiPF6 and LiTFSI is studied for the increased performance of a dual-carbon battery (DCB). Unlike the fluorine- or the imide-based anions (e.g., PF6ˉ and TFSIˉ), the cluster formation between co-intercalated PF6ˉ and TFSIˉ in the positive electrode of a DCB results in achieving high discharge capacities with significantly increased cycle properties. A reversible discharge capacity of 85 mAh/g-cathode over 350 cycles with no significant degradation is presented. The Coulombic efficiency of almost 100% is reached after the initial 10 cycles and suitable rate property is also observed. F NMR analysis on graphitic carbon intercalated with PF6ˉ and TFSIˉ suggests the interaction between two anions and ratio of intercalated PF6− and TFSI− was changed by applied voltage, resulting in the increased stability of the intercalated structure which is also supported by the first principles calculations.
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U2 - 10.1016/j.jpowsour.2020.229084
DO - 10.1016/j.jpowsour.2020.229084
M3 - Article
AN - SCOPUS:85094193217
SN - 0378-7753
VL - 479
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 229084
ER -
