Improved lithium storage properties of electrospun TiO2 with tunable morphology: from porous anatase to necklace rutile.
Three-dimensional TiO2 with tunable morphology and crystalline phase was successfully prepared by the electrospinning technique and subsequent annealing. Porous-shaped anatase TiO2, cluster-shaped anatase TiO2, hierarchical-shaped rutile (minor) TiO2 and nano-necklace rutile (major) TiO2 were achieved at 500, 600, 700 and 800 °C, respectively. The mechanism of the formation of these tailored morphologies and crystallinity was investigated. Lithium insertion properties were evaluated by galvanostatic and potentiostatic modes in half-cell configurations. By combining the large surface area, open mesoporosity and stable crystalline phase, the porous-shaped anatase TiO2 exhibited the highest capacity, best rate and cycling performance among the four samples. The present results demonstrated the usefulness of three-dimensional TiO2 as an anode for lithium storage with improved electrode performance.
Jiangsu Laboratory of Advanced Functional Material, Department of Chemistry, Changshu Institute of Technology, Changshu 215500, China. gyang@cslg.edu.cn.
Yang
Y
Yang
Haiying
H
Wang
Qiwen
Q
Zhou
Mengqi
M
Kong
Haitao
H
Ye
Gang
G
Yang
D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry; D016062:Porosity; D014025:Titanium / Q000737:chemistry*
C009495:titanium dioxide; D008094:Lithium; D014025:Titanium