Conversion-type anode materials of transition metal oxides,sulfides and selenides M_(a)X_(b)(M=transition metal,X=O,S,and Se)are being heavily studied in the fields of alkali-ion batteries,including Li-,Na-,and Kion b...Conversion-type anode materials of transition metal oxides,sulfides and selenides M_(a)X_(b)(M=transition metal,X=O,S,and Se)are being heavily studied in the fields of alkali-ion batteries,including Li-,Na-,and Kion batteries(LIBs,NIBs,and KIBs).This is because the conversion reaction of a MaXb anode is a redox process of multielectron transfer per formula,generating a large capacity and potentially leading to a high energy density of battery cells.展开更多
A second harmonic generation system with two type II KDP crystals in quadrature is optimized for the nanosecond chirp pulse. The acceptance bandwidth of this optimizing scheme is close to 10 nm by using two crystals w...A second harmonic generation system with two type II KDP crystals in quadrature is optimized for the nanosecond chirp pulse. The acceptance bandwidth of this optimizing scheme is close to 10 nm by using two crystals with slightly opposite angular detuning from phase matching and the conversion efficiency can reach 70% for top-hat chirp pulse at -2 GW/cm^2 in theory. The preliminary experimental results are obtained on the 9th beam of Shen Guang Ⅱ SGⅡ laser system, and the performance of optimization is partially verified.展开更多
A floating type pendulum wave energy converter(FPWEC) with a rotary vane pump as the power take-off system was proposed by Watabe et al.in 1998.They showed that this device had high energy conversion efficiency.In the...A floating type pendulum wave energy converter(FPWEC) with a rotary vane pump as the power take-off system was proposed by Watabe et al.in 1998.They showed that this device had high energy conversion efficiency.In the previous research,the authors conducted 2D wave tank tests in regular waves to evaluate the generating efficiency of FPWEC with a power take-off system composed of pulleys,belts and a generator.As a result,the influence of the electrical load on the generating efficiency was shown.Continuously,the load characteristics of FPWEC are pursued experimentally by using the servo motors to change the damping coefficient in this paper.In a later part of this paper,the motions of the model with the servo motors are compared with that of the case with the same power take-off system as the previous research.From the above experiment,it may be concluded that the maximum primary conversion efficiency is achieved as high as 98%at the optimal load.展开更多
CONSPECTUS:The success of lithium-ion batteries(LIBs)has driven the vigorous development of mobile electronic devices and electric vehicles.As a key component of LIBs,the energy density of traditional cathode material...CONSPECTUS:The success of lithium-ion batteries(LIBs)has driven the vigorous development of mobile electronic devices and electric vehicles.As a key component of LIBs,the energy density of traditional cathode materials has approached the theoretical limit,and the scarce transition metal elements have significantly increased the cost of batteries.In pursuit of cheap,abundant,and high-capacity materials,more attention is being focused on conversion-type cathodes.Sulfur(S),as a competitive nonmetallic element with extremely high theoretical capacity,has been widely studied in recent years.展开更多
基金support of the Engineering and Physical Sciences Research Council(EP/V000152/1,EP/X000087/1)Leverhulme Trust(RPG-2021-138)+4 种基金Royal Society(IEC\NSFC\223016)the support of the Education Department of Liaoning Province(JYTQN2023285)the Shenyang University of Technology(QNPY202209-4)the Key Laboratory of Functional Inorganic Material Chemistry(Heilongjiang University)the School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering(KF202405).
文摘Conversion-type anode materials of transition metal oxides,sulfides and selenides M_(a)X_(b)(M=transition metal,X=O,S,and Se)are being heavily studied in the fields of alkali-ion batteries,including Li-,Na-,and Kion batteries(LIBs,NIBs,and KIBs).This is because the conversion reaction of a MaXb anode is a redox process of multielectron transfer per formula,generating a large capacity and potentially leading to a high energy density of battery cells.
基金supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China under Grant No.1229241A00
文摘A second harmonic generation system with two type II KDP crystals in quadrature is optimized for the nanosecond chirp pulse. The acceptance bandwidth of this optimizing scheme is close to 10 nm by using two crystals with slightly opposite angular detuning from phase matching and the conversion efficiency can reach 70% for top-hat chirp pulse at -2 GW/cm^2 in theory. The preliminary experimental results are obtained on the 9th beam of Shen Guang Ⅱ SGⅡ laser system, and the performance of optimization is partially verified.
文摘A floating type pendulum wave energy converter(FPWEC) with a rotary vane pump as the power take-off system was proposed by Watabe et al.in 1998.They showed that this device had high energy conversion efficiency.In the previous research,the authors conducted 2D wave tank tests in regular waves to evaluate the generating efficiency of FPWEC with a power take-off system composed of pulleys,belts and a generator.As a result,the influence of the electrical load on the generating efficiency was shown.Continuously,the load characteristics of FPWEC are pursued experimentally by using the servo motors to change the damping coefficient in this paper.In a later part of this paper,the motions of the model with the servo motors are compared with that of the case with the same power take-off system as the previous research.From the above experiment,it may be concluded that the maximum primary conversion efficiency is achieved as high as 98%at the optimal load.
基金supported by and the National Natural Science Foundation of China(grant nos.22350710185,22179120,and 21975225)the National Key Research and Development Program of China(2022YFB2402200).
文摘CONSPECTUS:The success of lithium-ion batteries(LIBs)has driven the vigorous development of mobile electronic devices and electric vehicles.As a key component of LIBs,the energy density of traditional cathode materials has approached the theoretical limit,and the scarce transition metal elements have significantly increased the cost of batteries.In pursuit of cheap,abundant,and high-capacity materials,more attention is being focused on conversion-type cathodes.Sulfur(S),as a competitive nonmetallic element with extremely high theoretical capacity,has been widely studied in recent years.
