@article{oai:repository.lib.tottori-u.ac.jp:00007281,
 author = {Usui, Hiroyuki and Usui, Hiroyuki and Domi, Yasuhiro and Domi, Yasuhiro and Shimizu, Masahiro and Imoto, Akinobu and Yamaguchi, Kazuki and Sakaguchi, Hiroki and Sakaguchi, Hiroki and Shimizu, Masahiro and Imoto, Akinobu and Yamaguchi, Kazuki},
 journal = {Journal of power sources, Journal of power sources},
 month = {Oct},
 note = {The anode properties of Nb-doped rutile TiO2 electrodes were investigated in an ionic liquid electrolyte comprised of N-methyl-N-propylpyrrolidinium cation and bis(fluorosulfonyl)amide anion for use in a safe Na-ion battery. Although the electrolyte’s conductivity was lower than that of a conventional organic electrolyte at 30 oC, it showed high conductivity comparable to that of the organic electrolyte at 60 oC. The Nb-doped TiO2 electrode showed excellent cyclability in the ionic liquid electrolyte at 60 oC: a high capacity retention of 97% was observed even at the 350th cycle, which is comparable to value in the organic electrolyte (91%). In a non-flammability test in a closed system, no ignition was observed with the ionic liquid electrolyte even at 300 oC. These results indicate that combination of a Nb-doped TiO2 anode and ionic liquid electrolyte gives not only an excellent cyclability but also high safety for a Na-ion battery operating at a temperature below the sodium’s melting point of 98 oC.},
 pages = {428--431},
 title = {Niobium-doped titanium oxide anode and ionic liquid electrolyte for a safe sodium-ion battery},
 volume = {329},
 year = {2016}
}