TY - JOUR
T1 - Electrochemical performance of 0.5Li2MnO3-0.5Li(Mn0.375Ni0.375Co0.25)O2 composite cathode in pyrrolidinium-based ionic liquid electrolytes
AU - Patra, Jagabandhu
AU - Dahiya, Prem Prakash
AU - Tseng, Chung Jen
AU - Fang, Jason
AU - Lin, Yu Wei
AU - Basu, S.
AU - Majumder, S. B.
AU - Chang, Jeng Kuei
N1 - Funding Information:
The financial support of this work by the Ministry of Science and Technology of Taiwan (under grants 102-2923-E-008-002-MY3 and 103-ET-E-008-004-ET ) is gratefully appreciated. The financial support from DST, Government of India (under a grant GITA/DST/TWN/P-46/2013 , dated 10-07-2013) is gratefully acknowledged. One of the authors (S. Basu) wishes to acknowledge the partial support for this research obtained from a DST WOS-A fellowship. S.B. Majumder gratefully acknowledges the partial support from SGIRG grant awarded by IIT Kharagpur.
PY - 2015/6/20
Y1 - 2015/6/20
N2 - High-energy-density 0.5Li2MnO3-0.5Li(Mn0.375Ni0.375Co0.25)O2 composite cathodes for lithium rechargeable batteries are synthesized using an auto-combustion method. The electrode charge-discharge properties are studied at 25 and 50 °C in Li+-containing N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) and N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMP-TFSI) ionic liquid (IL) electrolytes. The IL electrolytes have a high decomposition temperature (∼400 °C) and thus are ideal for high-safety applications. Compared to Li+/BMP-TFSI IL, Li+/PMP-TFSI IL exhibits higher ionic conductivity and lower viscosity. As a result, the composite cathode shows superior electrochemical performance in Li+/PMP-TFSI IL electrolyte. With the increase in cell temperature from 25 to 50 °C, the maximum capacities and rate capabilities of both IL cells improve significantly. Thus at 50 °C, discharge capacities of 304 mAh g-1 (@10 mA g-1) and 223 mAh g-1 (@100 mA g-1) are obtained for the Li+/PMP-TFSI cell. These capacities are superior to those for a control cell made with the same composite cathode and a conventional organic electrolyte. At elevated temperature, the cyclability of the composite cathode in the IL electrolytes is markedly higher than that obtained in a conventional organic electrolyte.
AB - High-energy-density 0.5Li2MnO3-0.5Li(Mn0.375Ni0.375Co0.25)O2 composite cathodes for lithium rechargeable batteries are synthesized using an auto-combustion method. The electrode charge-discharge properties are studied at 25 and 50 °C in Li+-containing N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI) and N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMP-TFSI) ionic liquid (IL) electrolytes. The IL electrolytes have a high decomposition temperature (∼400 °C) and thus are ideal for high-safety applications. Compared to Li+/BMP-TFSI IL, Li+/PMP-TFSI IL exhibits higher ionic conductivity and lower viscosity. As a result, the composite cathode shows superior electrochemical performance in Li+/PMP-TFSI IL electrolyte. With the increase in cell temperature from 25 to 50 °C, the maximum capacities and rate capabilities of both IL cells improve significantly. Thus at 50 °C, discharge capacities of 304 mAh g-1 (@10 mA g-1) and 223 mAh g-1 (@100 mA g-1) are obtained for the Li+/PMP-TFSI cell. These capacities are superior to those for a control cell made with the same composite cathode and a conventional organic electrolyte. At elevated temperature, the cyclability of the composite cathode in the IL electrolytes is markedly higher than that obtained in a conventional organic electrolyte.
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U2 - 10.1016/j.jpowsour.2015.06.035
DO - 10.1016/j.jpowsour.2015.06.035
M3 - Article
AN - SCOPUS:84934939900
SN - 0378-7753
VL - 294
SP - 22
EP - 30
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
