Journal
JOURNAL OF POWER SOURCES
Volume 354, Issue -, Pages 10-15Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.04.027
Keywords
Sodium secondary battery; Negative electrode; Na2Ti3O7/C; Ionic liquid electrolyte; Charge-discharge characteristics
Funding
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST) [3428]
- Elements Strategy for Catalysts and Batteries (ESICB) program of the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT)
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In this study, carbon-coated Na2Ti3O7 (Na2Ti3O7/C) is synthesized by a solid-state reaction method, and its charge-discharge characteristics as a negative electrode material in an ionic liquid electrolyte, Na [FSA]-[C(3)C(1)pyrr][FSA] (FSA = bis(fluorosulfonyl)amide; C(3)C(1)pyrr = N-methyl-N-propylpyrrolidinium), are investigated at 363 K. The Na2Ti3O7/C negative electrode shows an initial discharge capacity of 215 mAh (g-Na2Ti3O7/C)(-1) at a current rate of 20 mA (g-Na2Ti3O7/C)(-1) in the voltage range 0.01-2.5 V. The high discharge capacity of the Na2Ti3O7/C negative electrode is attributed to the high operation temperature in the Na[FSA]-[C(3)C(1)pyrr][FSA] ionic liquid electrolyte. Although high discharge capacity is achieved, the Na2Ti3O7/C negative electrode shows relatively poor cycle performance because of the irreversible insertion of some Na ions and the formation of cracks. (C) 2017 Elsevier B.V. All rights reserved.
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