Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 35, Issue 1, Pages 79-85Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201600634
Keywords
sodium titanate; electrospinnig method; nanofiber; sodium-ion battery
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Funding
- National Natural Science Foundation of China [21473022, 51502032, 21673033, 11234013]
- Science and Technology Bureau of Sichuan Province of China [2015HH0033]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [Sklpme2016-4-23]
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To overcome the sluggish kinetics in sodium-ion batteries, sodium titanate/carbon (Na2Ti3O7/C) composite nanofibers as anode materials have successfully been synthesized via a simple electrospinning method. After calcination at 800 degrees C for 3h, the obtained Na2Ti3O7 nanoparticles are randomly dispersed in the matrix of in situ pyrolized carbon nanofiber. The Na2Ti3O7/C hybrid nanofiber obtained with 2.5wt% of poly (vinylpyrrolidone) additive in the precursor solution has the smallest diameter of similar to 120nm and the finest particle size of similar to 40nm, exhibiting the best rate performance of 101 mAh center dot g(-1) at 4 C and excellent capacity retention of 82% at 1 C after 100 cycles. Furthermore, this composite nanofiber also demonstrates good cycling performance under low current density of 0.1 C, which is attributed to the formation of stable solid electrolyte interface (SEI) film induced by small volume expansion/contraction of the fine Na2Ti3O7 nanoparticles during the charge/discharge process.
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