Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of...Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives. This study investigated the capacity fading mechanism of all-solid-state lithium–sulfur(Li–S) batteries using Li4(BH4)3I solid electrolytes by analyzing the cathode microstructure. Crosssectional scanning electron microscopy observations after 100 discharge–charge cycles revealed crack formation in the Li4(BH4)3I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li4(BH4)3I solid electrolyte occurred at a constant rate during the cycling tests.To combat these effects, the cycle life of Li–S batteries was improved by increasing the amount of solid electrolyte in the cathode.展开更多
A facile method for removing copper from guanyl-0-alkylisourea copper complex was found by using electrolysis.The complex was electrolyzed at a copper cathode in dilute hydrochloric or nitric acid to give guanyl-O- al...A facile method for removing copper from guanyl-0-alkylisourea copper complex was found by using electrolysis.The complex was electrolyzed at a copper cathode in dilute hydrochloric or nitric acid to give guanyl-O- alkylisourea salt in high yield and current efficiency.展开更多
Solid-state potassium metal batteries have increasingly gained attention as promising alternatives in largescale energy storage due to their safety and low cost.However,these batteries usually suffer from a lack of su...Solid-state potassium metal batteries have increasingly gained attention as promising alternatives in largescale energy storage due to their safety and low cost.However,these batteries usually suffer from a lack of suitable K^(+)conducting solid electrolytes.Herein,a new KB_(11)H_(14)·2Me_(3)NBH_(3) complex electrolyte with high ionic conductivity and relative stability against K metal is reported.The crystal structure was solved as a monoclinic P2_(1)/c lattice.Density functional theory(DFT)calculations confirm significantly enhanced K-ion diffusion in the structure.High K-ion conductivities of 2.63×10^(-6) S cm^(-1) at 25℃ and 3.25×10^(-4) S cm^(-1) at 75℃ are achieved,putting it among the leading K^(+)solid conductors.Moreover,it shows favorable interfacial stability against the K metal anode precoated with NH_(3)B_(3)H_(7).Batteries coupling the TiS_(2) cathode deliver long-term cycling stability.This work provides a new group of K-ion solid-state electrolytes for safe potassium metal batteries.展开更多
In this study, we report an efficient CdTe-SnOquantum dot（QD） solar cell fabricated by heat-assisted drop-casting of hydrothermally synthesized CdTe QDs on electrospun SnOnanofibers. The as-prepared QDs and SnOnanof...In this study, we report an efficient CdTe-SnOquantum dot（QD） solar cell fabricated by heat-assisted drop-casting of hydrothermally synthesized CdTe QDs on electrospun SnOnanofibers. The as-prepared QDs and SnOnanofibers were characterized by dynamic light scattering（DLS）, UV–Vis spectroscopy,photoluminescence（PL） spectra, X-ray diffraction（XRD） and transmission electron microscopy（TEM）. The SnOnanofibers deposited on fluorine-doped tin oxide（SnO） and sensitized with the CdTe QDs were assembled into a solar cell by sandwiching against a platinum（Pt） counter electrode in presence of cobalt electrolyte. The efficiency of cells was investigated by anchoring QDs of varying sizes on SnO. The best photovoltaic performance of an overall power conversion efficiency of 1.10%, an open-circuit voltage（Voc）of 0.80 V, and a photocurrent density（JSC） of 3.70 m A/cmwere obtained for cells with SnOthickness of5–6 μm and cell area of 0.25 cmunder standard 1 Sun illumination（100 m W/cm）. The efficiency was investigated for the same systems under polysulfide electrolyte as well for a comparison.展开更多
基金JSPS KAKENHI(Early-Career Scientists[grant numbers 19K15305,19K15666]Grants-in-Aid for Scientific Research on Innovative Areas“Hydrogenomics”[grant number JP18H05513])supported by the Core Research Clusters for Materials Science and Advanced Target Project–2 of WPI–AIMR,from Tohoku University。
文摘Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives. This study investigated the capacity fading mechanism of all-solid-state lithium–sulfur(Li–S) batteries using Li4(BH4)3I solid electrolytes by analyzing the cathode microstructure. Crosssectional scanning electron microscopy observations after 100 discharge–charge cycles revealed crack formation in the Li4(BH4)3I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li4(BH4)3I solid electrolyte occurred at a constant rate during the cycling tests.To combat these effects, the cycle life of Li–S batteries was improved by increasing the amount of solid electrolyte in the cathode.
文摘A facile method for removing copper from guanyl-0-alkylisourea copper complex was found by using electrolysis.The complex was electrolyzed at a copper cathode in dilute hydrochloric or nitric acid to give guanyl-O- alkylisourea salt in high yield and current efficiency.
基金supported by the National Natural Science Foundation of China(Grant No.U18042532,U23A2078,22171246,92261203,and 22273053)。
文摘Solid-state potassium metal batteries have increasingly gained attention as promising alternatives in largescale energy storage due to their safety and low cost.However,these batteries usually suffer from a lack of suitable K^(+)conducting solid electrolytes.Herein,a new KB_(11)H_(14)·2Me_(3)NBH_(3) complex electrolyte with high ionic conductivity and relative stability against K metal is reported.The crystal structure was solved as a monoclinic P2_(1)/c lattice.Density functional theory(DFT)calculations confirm significantly enhanced K-ion diffusion in the structure.High K-ion conductivities of 2.63×10^(-6) S cm^(-1) at 25℃ and 3.25×10^(-4) S cm^(-1) at 75℃ are achieved,putting it among the leading K^(+)solid conductors.Moreover,it shows favorable interfacial stability against the K metal anode precoated with NH_(3)B_(3)H_(7).Batteries coupling the TiS_(2) cathode deliver long-term cycling stability.This work provides a new group of K-ion solid-state electrolytes for safe potassium metal batteries.
基金supported by Solar Energy Research Initiative(SERI)of Department of Science and Technology(DST),Govt.of India
文摘In this study, we report an efficient CdTe-SnOquantum dot（QD） solar cell fabricated by heat-assisted drop-casting of hydrothermally synthesized CdTe QDs on electrospun SnOnanofibers. The as-prepared QDs and SnOnanofibers were characterized by dynamic light scattering（DLS）, UV–Vis spectroscopy,photoluminescence（PL） spectra, X-ray diffraction（XRD） and transmission electron microscopy（TEM）. The SnOnanofibers deposited on fluorine-doped tin oxide（SnO） and sensitized with the CdTe QDs were assembled into a solar cell by sandwiching against a platinum（Pt） counter electrode in presence of cobalt electrolyte. The efficiency of cells was investigated by anchoring QDs of varying sizes on SnO. The best photovoltaic performance of an overall power conversion efficiency of 1.10%, an open-circuit voltage（Voc）of 0.80 V, and a photocurrent density（JSC） of 3.70 m A/cmwere obtained for cells with SnOthickness of5–6 μm and cell area of 0.25 cmunder standard 1 Sun illumination（100 m W/cm）. The efficiency was investigated for the same systems under polysulfide electrolyte as well for a comparison.
