| 2 | Characterization and Electrochemical Properties of Nanostructured Zr-Doped Anatase TiO_2 Tubes Synthesized by Sol–Gel Template Route显示文摘A series of nanostructured Zr-doped anatase TiO_2 tubes with the Zr/Ti molar ratio of 0.01, 0.02, 0.03, and0.09 were prepared by a sol–gel technology on a carbon fiber template. The electrochemical performance of Zr-doped anatase TiO_2 as anodes for rechargeable lithium batteries was investigated and compared with undoped titania. Tests represented that after 35-fold charge/discharge cycling at C/10 the reversible capacity of Zr-doped titania(Zr/Ti = 0.03) reaches 135 m A h g^(-1), while the capacity of undoped titania(Zr/Ti = 0) yielded only 50 m A h g^(-1). Based on the results of the physicochemical investigation, three reasons of improving electrochemical performance of Zr-doped titania were suggested. According to the scanning electron microscopy and transmission electron microscopy, Zr^(4+) doping induces a decrease in nanoparticle size, which facilitates the Li+diffusion. The Raman investigations show the more open structure of Zr-doped TiO_2 as compared to undoped titania due to changing of the unit cell parameters, that significantly affects on the reversibility of the insertion/extraction process. The electrochemical impedance spectroscopy results indicate that substitution of Zr^(4+) for Ti^(4+) into anatase TiO_2 has favorable effects on the conductivity. | Denis P.Opra Sergey V.Gnedenkov Sergey L.Sinebryukhov Elena I.Voit Alexander A.Sokolov Evgeny B.Modin Anatoly B.Podgorbunsky Yury V.Sushkov Veniamin V.Zheleznov | 2017 | Journal of Materials Science & Technology2017，33，6： | 1 |
| 4 | Zr4+/F– co-doped TiO2(anatase) as high performance anode material for lithium-ion battery显示文摘Zr^(4+) and F~– co-doped TiO_2 with the formula of Ti_(0.97)Zr_(0.03)O_(1.98)F_(0.02) was facilely synthesized by a sol-gel template route.The crystal structure,morphology,composition,surface area,and conductivity were characterized by Raman spectroscopy,energy-dispersive X-ray analysis,scanning electron microscopy,Brunauer-Emmett-Teller measurements,X-ray photoelectron spectroscopy,and electrochemical impedance spectroscopy.The results demonstrate that Zr^(4+)and F~–homogeneously incorporated into TiO_2,forming solid solution with an anatase structure.Ti_(0.97)Zr_(0.03)O_(1.98)F_(0.02)shows outstanding electrochemical properties as Li-ion battery anode in comparison with Ti_(0.97)Zr_(0.03)O_2.In particular,upon 35-fold cycling at 1C-rate Zr^(4+)/F~–co-doped TiO_2delivers a reversible capacity of 163 mAh g^(–1),whereas Zr^(4+)-doped TiO_2gives only 34 mA h g^(–1).Additionally,Zr^(4+)/F~–co-doped TiO_2retains a capacity of 138 mA h g^(–1)during cycling even at 10 C.The enhance performance originates from improved conductivity of Zr^(4+)/F~–co-doped TiO_2material through generation of Ti^(3+)(serving as electron donors)into the crystal lattice and,possibly,due to F-doping blocked the anode surface from attack of HF formed as electrolyte decomposition product. | Denis P.Opra Sergey V.Gnedenkov Sergey L.Sinebryukhov Elena I.Voit Alexander A.Sokolov Alexander Yu.Ustinov Veniamin V.Zheleznov | 2018 | Progress in Natural Science:Materials International2018，28，5： | 0 |
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