Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 6, Pages 4458-4465Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5002053
Keywords
lithium-ion battery; anatase titanium dioxide; N doping; rate capability; electrochemical kinetic properties
Funding
- National Natural Science Foundation of China [51272088]
- National Found for Fostering Talents of Basic Science [J1103202]
- Research Fund for the Doctoral Program of Higher Education of China [20110061130006]
- Research Fund for High Technology Development of Jilin Province [20120310]
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Pure anatase TiO2 and N-doped TiO2 nanoparticles were prepared by a solvothermal method. X-ray photoelectron spectroscopy showed that the surface of the doped material was dominated by interstitial N, while interstitial and substitutional N coexisted in the material bulk. Both materials showed superior cycle stability. In addition, the N-doped material exhibited much better rate capability than pure TiO2. A discharge capacity of 45 mAh g(-1) was obtained at the 15 C rate, which was 80% higher than that of pure TiO2. The electrochemical kinetic properties of the materials were studied by a galvanostatic intermittent titration technique and electrochemical impedance spectroscopy. The charge-transfer resistance of TiO2 was decreased by N doping. Meanwhile, the minimum lithium diffusion coefficient was increased to 2.14 X 10(-11) cm(2) s(-1), which is 13 times higher than that of pure TiO2. This indicates that the electrochemical kinetic properties of TiO2 were improved by N doping, which substantially improved the specific capacity and rate capability of TiO2.
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