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    Lithium Amount Effect of Li-Inserted Ultra-Surface Area-Activated Carbon and Improvement of the Electrochemical Performance with Magnetic Field for Li-Ion Capacitors
    (2022-12-27)
    Otgonbayar, Zambaga
    ;
    Areerob, Yonrapach
    ;
    Yang, Sunhye
    ;
    Kim, Ick Jun
    ;
    Oh, Won Chun
    It is possible that controlling the lithium-ion amount may relate to the high energy and the specific capacitance of active materials into a single device. As the cathode for Li-ion capacitors (LICs) using nonaqueous electrolytes, we investigated surface functionalization of ultra-surface area-activated carbon (UAC) powder. An increase in capacitance was observed, from 1.25 × 104 to 8.10 × 104 F/g with controlling of lithium amount, as well as an increase in the area explicit capacitance per BET surface region from 657.57 to 1605.25 m2/g, which indicates that redox responses and their remarkable potential might enhance the capacitance for LICs. The pseudocapacitive redox reaction at C=O destinations is mostly attributed to capacitance enhancement. As with the improvement in capacitance, it was discovered that the arrangement of the electrolytes depends on the wetting behavior and particle size that can be adjusted. This study suggests the way for a low-cost and widely used UAC powder with controlling of lithium amount and a magnetic field for LICs. The 6LUAC samples treated with a magnetic field showed excellent specific capacity and energy density compared to samples not treated with a magnetic field under the same test conditions. Finally, we expect that this method may contribute to improvement of the electrochemical performance of materials.
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    Vibration analysis based on magnetic field balancing technique
    (2018-08-13)
    Sriratana, Witsarut
    ;
    Saithong, Pasut
    ;
    Sriratana, Lerdlekha
    This paper presents the design of a vibration measurement system according to ISO 10816-1 standard. In this study, a vibration measuring device was applied the magnetic field balancing technique. For study, the vibration generated for experiment was from a vibration of the motor which taking load in various conditions. The operation and performance analysis of the motor in terms of balance and unbalance position of load can be determined by dividing the experiment into four conditions: Balance position, 25% of unbalance position, 50% of unbalance position and 75% of unbalance position. The magnetic field method influenced by the permanent magnets was applied and the Hall Effect sensor was used as a sensor. The results of the experiment were then compared to those from output voltage of the Hall Effect sensor as well as those from the magnetic field density for analysis the vibration and the effectiveness of motor. The results of the experiment can be considered in terms of torque, frequency and the output voltage of Hall Effect sensor. It was found that the output voltage of Hall Effect sensor at balance position, 25% of unbalance position, 50% of unbalance position and 75% of unbalance position were equal to 2.54 V, 2.67 V, 2.77 V and 2.86 V, respectively while the average of process error was 0.34%.