Li-ion batteries hold an important place in the field of high power batteries because of their high open circuit voltage and associated high energy density. However, the safety is less satisfactory; therefore, the study of the factors that affect the safety of Li-ion batteries has much meaning to the safety design. In this paper, a set of apparatus was developed for in situ measurements, and several commercial materials including electrolyte, separator and electrode materials for Li-ion batteries were investigated by the in situ method. The results showed: 1) The electrolyte vapor pressure is influenced significantly by the component with low boiling point and increases rapidly with the increasing of temperature; 2) the shutdown of separator occurs at around 135℃ and the impedance increases approximately by two orders of magnitude; 3) carbon anode materials affect the most the volume changes of the cell, and the change for a graphite anode is much greater than that of a glassy carbon anode.
To supply the cathode high voltage for the four gyrotrons ( 68GHz/500kW/ls) of the ECRH system on HL-2A, the star-point control high voltage power supply ( HVPS) with rated output of60kV/120A has been built. The filtering inductors in the HVPS are on the primary side of the rectifier transformers, so the required insulation level of the inductors to local earth is much smaller than that they are on the secondary side of the rectifier transformers. The output voltage can be modulated by changing the excitation current of the rectifier transformers. The high voltage pulse modulators based on tetrode vacuum tube ( TM-703FB) are also applied in the power supply to realize the fast rising and falling of the output voltage. The over-current protection and voltage overshoot are executed by the star-point
A one-dimensional (1D) Ni(II) coordination polymer, { [Ni-(oba)(1,3-bix)(H 2 O)]⋅H 2 O} n (1), where H 2 oba = 4,4'-oxybis(benzoic acid) and 1,3-bis(imidazol-l-yl-methyl)benzene = 1,3-bix, was hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis, single-crystal Xray diffraction, and Hirshfeld surface analyses. X-ray diffraction structural analysis has revealed that the oba and 1,3-bix ligands connects the Ni(II) atoms to form a square-wave 1D chain, which is further extended into 2D supramolecular layers through OÀ H⋅⋅⋅O hydrogen bonds and π⋅⋅⋅π stacking interactions. 1 shows intense luminescence in H 2 O and exhibits a selectivity and detection for Fe 3 + ions through the fluorescence quenching effect at room temperature.
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