Electrochemical insertion/extraction of Li on cathode materials of spinel type LiMn2O4 and ordered rock-salt type LiCo0.5 Ni0.5O2 was measured on samples of which structures were well characterized. On the basis of ex...Electrochemical insertion/extraction of Li on cathode materials of spinel type LiMn2O4 and ordered rock-salt type LiCo0.5 Ni0.5O2 was measured on samples of which structures were well characterized. On the basis of experimental results on structure, morphology and charge-discharge characteristics, the effect of crystallinity of the cathode materiaIs on electrochemical Li insertion/extraction performance was discussed. These two transition metal oxides belong to onegroup that the crystallinity of these oxides affects to the performance.展开更多
Electrochemical insertion/extraction of Li on cathode materials of anatase type TiO_2, quasilayered structure V_2O_5 and layered structure MoO_3 was measured on samples of which structures were well characterized and...Electrochemical insertion/extraction of Li on cathode materials of anatase type TiO_2, quasilayered structure V_2O_5 and layered structure MoO_3 was measured on samples of which structures were well characterized and showed a wide range of crystallinity. On the basis of experimental results on structure, morphology and charge-discharge characteristics, the effect of crystallinity of the cathode materials on electrochemical Li insertion/extraction pedermance was discussed. These three transition metal oxides were classified as one group on the basis of whether the crystallinity of these oxides affects to the performance or not; LiMn_2O_4 and LiCo_(0.5)O_2 belongs to the former group and TiO_2, V_2O_5 and MoO_3 to the latter.展开更多
1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fie...1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fields,especially in展开更多
Lithium(Li)is an essential element in modern energy production and storage devices.Technology to extract Li from seawater,which contains~230 billion tons of Li,offers a solution to the widespread concern regarding qua...Lithium(Li)is an essential element in modern energy production and storage devices.Technology to extract Li from seawater,which contains~230 billion tons of Li,offers a solution to the widespread concern regarding quantitative and geographical limitations of future Li supplies.To obtain green Li from seawater,we propose an unassisted photoelectrochemical(PEC)Li extraction system based on an III-V-based triple-junction(3J)photoelectrode and a Li-ion selective membrane with only sunlight as an input.A light-harvesting/catalysis decoupling scheme yielded a 3J photoelectrode with excellent light-harvesting and catalysis reaction capabilities and superb stability over the 840 h of the extraction process.It allows the system to successfully enrich seawater Li by 4,350 times(i.e.,from 0.18 ppm to 783.56 ppm)after three extraction stages.The overall reaction of the unassisted PEC green Li extraction system achieved 2.08 mg kJ^(−1) of solar-to-Li efficiency and 3.65%of solar-to-hydrogen efficiency.展开更多
文摘Electrochemical insertion/extraction of Li on cathode materials of spinel type LiMn2O4 and ordered rock-salt type LiCo0.5 Ni0.5O2 was measured on samples of which structures were well characterized. On the basis of experimental results on structure, morphology and charge-discharge characteristics, the effect of crystallinity of the cathode materiaIs on electrochemical Li insertion/extraction performance was discussed. These two transition metal oxides belong to onegroup that the crystallinity of these oxides affects to the performance.
文摘Electrochemical insertion/extraction of Li on cathode materials of anatase type TiO_2, quasilayered structure V_2O_5 and layered structure MoO_3 was measured on samples of which structures were well characterized and showed a wide range of crystallinity. On the basis of experimental results on structure, morphology and charge-discharge characteristics, the effect of crystallinity of the cathode materials on electrochemical Li insertion/extraction pedermance was discussed. These three transition metal oxides were classified as one group on the basis of whether the crystallinity of these oxides affects to the performance or not; LiMn_2O_4 and LiCo_(0.5)O_2 belongs to the former group and TiO_2, V_2O_5 and MoO_3 to the latter.
基金Financial support from the National Natural Science Foundation of China (21276194)the Specialized Research Fund for the Doctoral Program of Chinese Higher Education (20101208110003)the Key Pillar Program of Tianjin Municipal Science and Technology (11ZCKGX02800)
文摘1 Introduction As the lightest metal with the unique properties of energy production and storage,lithium is regarded as the new century energy metal.Lithium and its compounds were widely used in various industrial fields,especially in
基金City University of Hong Kong funding(No.9380107).
文摘Lithium(Li)is an essential element in modern energy production and storage devices.Technology to extract Li from seawater,which contains~230 billion tons of Li,offers a solution to the widespread concern regarding quantitative and geographical limitations of future Li supplies.To obtain green Li from seawater,we propose an unassisted photoelectrochemical(PEC)Li extraction system based on an III-V-based triple-junction(3J)photoelectrode and a Li-ion selective membrane with only sunlight as an input.A light-harvesting/catalysis decoupling scheme yielded a 3J photoelectrode with excellent light-harvesting and catalysis reaction capabilities and superb stability over the 840 h of the extraction process.It allows the system to successfully enrich seawater Li by 4,350 times(i.e.,from 0.18 ppm to 783.56 ppm)after three extraction stages.The overall reaction of the unassisted PEC green Li extraction system achieved 2.08 mg kJ^(−1) of solar-to-Li efficiency and 3.65%of solar-to-hydrogen efficiency.
