title: Improved Li storage performance in SnO2 nanocrystals by a synergetic doping.
abstract: Tin dioxide (SnO2) is a widely investigated lithium (Li) storage material because of its easy preparation, two-step storage mechanism and high specific capacity for lithium-ion batteries (LIBs). In this contribution, a phase-pure cobalt-doped SnO2 (Co/SnO2) and a cobalt and nitrogen co-doped SnO2 (Co-N/SnO2) nanocrystals are prepared to explore their Li storage behaviors. It is found that the morphology, specific surface area, and electrochemical properties could be largely modulated in the doped and co-doped SnO2 nanocrystals. Gavalnostatic cycling results indicate that the Co-N/SnO2 electrode delivers a specific capacity as high as 716 mAh g(-1) after 50 cycles, and the same outstanding rate performance can be observed in subsequent cycles due to the ionic/electronic conductivity enhancement by co-doping effect. Further, microstructure observation indicates the existence of intermediate phase of Li3N with high ionic conductivity upon cycling, which probably accounts for the improvements of Co-N/SnO2 electrodes. The method of synergetic doping into SnO2 with Co and N, with which the electrochemical performances is enhanced remarkably, undoubtedly, will have an important influence on the material itself and community of LIBs as well.
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics &Electronics, Henan University, Kaifeng 475004, PR China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wan
authors.affiliation: Materials Engineering, McGill University, Montréal (Québec) H3A 0C5, Canada.
authors.forename: Xia
authors.initials: X
authors.lastname: Lu
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Yuesheng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics &Electronics, Henan University, Kaifeng 475004, PR China.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics &Electronics, Henan University, Kaifeng 475004, PR China.|Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Hu
authors.affiliation: Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: Sheng
authors.initials: S
authors.lastname: Dai