The electrochemical energy storage performance is greatly determined by the charge transfer and ion transportation occurring in the electrode ***,the enhancement of electric conductivity and ionic mobility is vital fo...
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The electrochemical energy storage performance is greatly determined by the charge transfer and ion transportation occurring in the electrode ***,the enhancement of electric conductivity and ionic mobility is vital for high-performing and stable metal ion ***,we report the properties of oxygen vacancies(VO)and carbon co-doped TiO_(2) hollow spheres(HS-TiO_(2))and compared them with fully oxidized white TiO_(2) hollow spheres(W-TiO_(2)).Theoretical calculations and experimental results revealed that the introduction of carbon dopant and VO in anatase TiO_(2) reduced the bandgap and the existence of localized electrons,leading to a lower migration barrier of Li ions that promoted faster ion diffusion kinetics,enabling the HS-TiO_(2) with higher reversibility during the insertion and extraction of Li ions than the W-TiO_(2).This HS-TiO_(2) delivered superior lithium storage properties with a specific discharge capacity of 214.6 mAh g^(-1) for the 100th cycle at 200 mA g^(-1) and 116.3 mAh g^(-1) over 2000 cycles at a high rate of 2 A g^(-1).
Spatial spectrum is an important tool for radar imaging performance analysis. In order to analyze the effect of spatial spectrum filling on the imaging quality of distributed passive radar, the constraints of spatial ...
Spatial spectrum is an important tool for radar imaging performance analysis. In order to analyze the effect of spatial spectrum filling on the imaging quality of distributed passive radar, the constraints of spatial spectrum filling are studied. The imaging model of distributed passive radar is established, the imaging resolution characteristics are analyzed, and the influencing factors of spatial spectrum filling are obtained. The filling rule of spatial spectrum is analyzed, and the constraint conditions for the critical azimuth and arc of filling are given. The validity of the constraint conditions is verified by simulation, which has guiding significance for optimization of radar station layout and imaging quality improvement.
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