Effect Of Operating Voltage Research Articles

Effect of operation voltage on the practical performance of high-energy-density LiCoO2/artificial graphite pouch cells at various temperatures

To achieve wide applications of LiCoO 2 -based high-voltage lithium-ion batteries, three questions remain to be answered: how to stabilize the cathode/electrolyte interphase upon cycling, what is the practical performance at the pouch cell level and various temperatures, and why the charge cutoff voltage is limited at 4.4 V. Thus, an ~3 Ah LiCoO 2 /artificial graphite pouch cell has been developed, whose performances at different temperatures and voltages have been studied. It is observed that the cell at 4.5 V exhibits ultrahigh area capacity and energy-density, good discharge abilities at high rates and at − 20 °C, and high cyclic stability. Investigation reveals that the bulk structure and interface of LiCoO 2 are stabilized by using LiCoO 2 , which is composed of monocrystalline and polycrystalline powders, and a combination of multiple electrolyte additives. We also find that the real barriers for a commercial application are the inferior high-rate charge ability due to the aggravated electrochemical polarization and poor storage stability at 60 °C caused by the side reactions. Undoubtedly, this work will deepen the understanding of the overall performance of LiCoO 2 -based high-energy-density pouch cells and direct further optimization of LiCoO 2 . • A ~3 Ah LiCoO 2 /artificial graphite pouch cell with high area capacity and energy-density is developed. • The practical cell performances at different voltages and temperatures are studied. • High capacity retention of 85.0% after cycled at 3.0 − 4.5 V for 1000 cycles is realized. • The variations of internal and interface structures upon cycling at different voltages are researched.

Effect of Operating Voltage and Grounding Method on the Internal Charging Characteristics of Polyimide

In this paper, a 3-D evaluation method for internal charging in dielectrics is established and verified by experimental data. The effects of the grounding method and the operating voltage on the internal electric field of polyimide are studied. The results show that the grounding method determines the grounding area and the maximum transmission distance of the deposited charge, increasing the grounding area and reducing the transmission distance can effectively reduce the internal electric field. In addition, when the operating voltage increases from 100 to 5000 V, the maximum electric field decreases gradually in case B (Grounded-Vs) and increases gradually in case D (Vs-Grounded). If the working voltage needs to be increased, the Grounded-Vs mode seems to be a good choice. When increasing the operating voltage, the key is to evaluate the influence of the external electric field on the transfer performance of the deposited charge.

Effect of Operating Voltage on Performance of Air Ionizer Used in Inspection Processes for Electronic Devices

Effect of Operating Voltage on Performance of Air Ionizer Used in Inspection Processes for Electronic Devices

Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Polyimide

Space Solar Power Station (SSPS) will operate in geosynchronous orbit. Its operating environment is rather complicated, including space plasma, energetic particles radiation, extreme temperature, and cosmic rays. To reduce power loss, SSPS has to apply high-voltage (HV) power generation and transmission technique. Deep dielectric charging will be a major problem in the design of insulation structure in SSPS. In this paper, the hopping conductivity of polyimide was studied. Hopping distance and hopping barrier height were obtained from surface potential decay analysis. Second, a deep dielectric charging model of polyimide under FLUMIC spectrum electron irradiation was established, in which the hopping conductivity parameters were applied. The effects of electron flux enhancement and operating voltage on the charging characteristics were discussed in four cases, i.e., A) suspended-HV; B) HV-suspended; C) grounded-HV; and D) HV-grounded. When the electron flux enhancement increases, the influence on case A is much larger than the other three cases. When the operating voltage increases, the influence on cases A and B is small, whereas the influence on cases C and D increases fast. Thus, when designing the SSPS, the effect of operating voltage and electron flux enhancement on the insulation system must be carefully considered.

Electrical and kinetical aspects of homogeneous dielectric-barrier discharge in xenon for excimer lamps

A pulsed dielectric-barrier discharge in xenon has been simulated for operating conditions typical to excimer lamps, in which the discharge is considered spatially homogeneous. The computer model developed is based on the xenon plasma chemistry, the circuit, and the Boltzmann equations. First, the validity of the physical model was checked and compared to experimental and theoretical works, and then the model is applied in the case of a sinusoidal voltage at period frequencies in the range of 50 kHz–2 MHz. The results obtained with the present description are in good agreement with experimental measurements and one-dimensional fluid prediction in terms of electrical characteristics and vacuum ultraviolet (vuv) emission. The effect of operation voltage, power source frequency, dielectric capacitance, as well as gas pressure on the discharge efficiency and the 172, 150, and 147 nm photon generation, under the typical experimental operating conditions and for the case of a sinusoidal applied voltage, have been investigated and discussed. Calculations suggest that the overall conversion efficiency from electrical energy to vuv emission in the lamp is greater than 38%, and it will be very affected at high power source frequency and high gas pressure with a significant dependence on the dielectric capacitance.