LiNi0.78 Co0.2 Al0.02O2 cathode materials were prepared with a novel co-precipitation method followed by heat-treating. The properties of the materials were characterized. XRD patterns showed that no secondary phase a...LiNi0.78 Co0.2 Al0.02O2 cathode materials were prepared with a novel co-precipitation method followed by heat-treating. The properties of the materials were characterized. XRD patterns showed that no secondary phase appeared and the hexagonal lattice parameter c of LiNi0.rsCoo.2AI^0202 was larger than that of LiNi0.8Co0.2O2. The SEM images indicated that the powders of the material were submicron size. The results of the ICP-AES analysis proved that elemental compositions of the material were similar to those of the targeted one. Cyclic voltammetry （3.0- 4. 2 V） illustrated that the new material had good lithium-ion intercalation/de-intercalation performance. The results of galvanostatic cycling showed that the initial specific discharge capacity of the prepared material was 181.4 mAh/g, and the specific discharge capacity was 177.3 mAh/g after 100 cycles （0. 2C, 3.0 - 4. 2 V, vs. Li^＋/Li） with the capacity retention ratio of 97.7%.展开更多
Organisms of delta form unique ecosystem consist of organisms of endemic, ocean and transition waters. Both Porong and Solo Deltas of East Java have a unique morphological characteristic because they were formed by di...Organisms of delta form unique ecosystem consist of organisms of endemic, ocean and transition waters. Both Porong and Solo Deltas of East Java have a unique morphological characteristic because they were formed by different sediments. During the study on foraminifera in the two deltas, agglutinated foraminifera were given special attention since there were so few records on the occurrence of this group from Indonesia. Agglutinated foraminifera characterized by their shell （test） formed materials that consisting of attachment of foreign materials and cemented by CaCO3 and SiO3. This study was conducted on November 2007 and showed the relatively similar result on Porong and Solo Deltas in term of species. But the number of collected specimens is significantly different, which was recorded more than doubled. Of the 15 stations studied in each delta, 19 species were collected from the Porong Delta and 21 species were in all 15 stations of the Solo Delta. The stations which located close to the mouth of the river contain more number of individuals than that away from it, especially Ammobaculites agglutinans and Textularia pseudogramen. Generally, the number of collected agglutinated foraminifera of Porong Delta was more abundant than Solo Delta.展开更多
Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency,tunable transport properties,high elemental abundance and low toxicity.In this review,we sum...Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency,tunable transport properties,high elemental abundance and low toxicity.In this review,we summarize the recent research progress on this large family compounds covering diamond-like chalcogenides and liquid-like Cu2X (X=S,Se,Te)binary compounds as well as their multinary derivatives.These materials have the general features of two sublattices to decouple electron and phonon transport properties.On the one hand,the complex crystal structure and the disordered or even liquid-like sublattice bring about an intrinsically low lattice thermal conductivity.On the other hand, the rigid sublattice constitutes the charge-transport network, maintaining a decent electrical performance.For specific material systems,we demonstrate their unique structural features and outline the structure-performance correlation. Various design strategies including doping,alloying,band engineering and nanostructure architecture,covering nearly all the material scale,are also presented.Finally,the potential of the application of Cu-based chalcogenides as high-performance thermoelectric materials is briefly discussed from material design to device development.展开更多
基金the Natural Science Foundation of Heilongjiang, China(Grant No.E2004-24).
文摘LiNi0.78 Co0.2 Al0.02O2 cathode materials were prepared with a novel co-precipitation method followed by heat-treating. The properties of the materials were characterized. XRD patterns showed that no secondary phase appeared and the hexagonal lattice parameter c of LiNi0.rsCoo.2AI^0202 was larger than that of LiNi0.8Co0.2O2. The SEM images indicated that the powders of the material were submicron size. The results of the ICP-AES analysis proved that elemental compositions of the material were similar to those of the targeted one. Cyclic voltammetry （3.0- 4. 2 V） illustrated that the new material had good lithium-ion intercalation/de-intercalation performance. The results of galvanostatic cycling showed that the initial specific discharge capacity of the prepared material was 181.4 mAh/g, and the specific discharge capacity was 177.3 mAh/g after 100 cycles （0. 2C, 3.0 - 4. 2 V, vs. Li^＋/Li） with the capacity retention ratio of 97.7%.
文摘Organisms of delta form unique ecosystem consist of organisms of endemic, ocean and transition waters. Both Porong and Solo Deltas of East Java have a unique morphological characteristic because they were formed by different sediments. During the study on foraminifera in the two deltas, agglutinated foraminifera were given special attention since there were so few records on the occurrence of this group from Indonesia. Agglutinated foraminifera characterized by their shell （test） formed materials that consisting of attachment of foreign materials and cemented by CaCO3 and SiO3. This study was conducted on November 2007 and showed the relatively similar result on Porong and Solo Deltas in term of species. But the number of collected specimens is significantly different, which was recorded more than doubled. Of the 15 stations studied in each delta, 19 species were collected from the Porong Delta and 21 species were in all 15 stations of the Solo Delta. The stations which located close to the mouth of the river contain more number of individuals than that away from it, especially Ammobaculites agglutinans and Textularia pseudogramen. Generally, the number of collected agglutinated foraminifera of Porong Delta was more abundant than Solo Delta.
基金supported by the National Key Research and Development Program of China (2018YFB0703600)the National Natural Science Foundation of China (51625205)+3 种基金 the Key Research Program of Chinese Academy of Sciences (KFZD-SW-421)Program of Shanghai Subject Chief Scientist (16XD1403900)Youth Innovation Promotion Association, CAS (2016232)Shanghai Sailing Program (18YF1426700).
文摘Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency,tunable transport properties,high elemental abundance and low toxicity.In this review,we summarize the recent research progress on this large family compounds covering diamond-like chalcogenides and liquid-like Cu2X (X=S,Se,Te)binary compounds as well as their multinary derivatives.These materials have the general features of two sublattices to decouple electron and phonon transport properties.On the one hand,the complex crystal structure and the disordered or even liquid-like sublattice bring about an intrinsically low lattice thermal conductivity.On the other hand, the rigid sublattice constitutes the charge-transport network, maintaining a decent electrical performance.For specific material systems,we demonstrate their unique structural features and outline the structure-performance correlation. Various design strategies including doping,alloying,band engineering and nanostructure architecture,covering nearly all the material scale,are also presented.Finally,the potential of the application of Cu-based chalcogenides as high-performance thermoelectric materials is briefly discussed from material design to device development.
