Solid-state polymer electrolytes(SPEs)are candidate schemes for meeting the safety and energy density needs of advanced lithium-based battery because of their improved mechanical and electrochemical stability compared...Solid-state polymer electrolytes(SPEs)are candidate schemes for meeting the safety and energy density needs of advanced lithium-based battery because of their improved mechanical and electrochemical stability compared to traditional liquid electrolytes.However,low ionic conductivity and side reactions occurring in traditional high-voltage lithium metal batteries(LMBs)hinder their practical applications.Here,amino-modified metal-organic frameworks(UiO-66-NH_(2))with abundant defects as multifunctional fillers in the polyurethane based SPEs achieve the collaborative promotion of the mechanical strength and room temperature ionic conductivity.The surface modified amino groups serve as anchoring points for oxygen atoms of polymer chains,forming a firmly hydrogen-bond interface with polycarbonate-based polyurethane frameworks.The rich interfaces between UiO-66-NH_(2) and polymers dramatically decrease the crystallization of polymer chains and reduce ion transport impedance,which markedly boosted the ionic conductivity to 2.1×10^(−4) S·cm^(−1) with a high Li+transference numbers of 0.71.As a result,LiFePO4∣SPEs∣Li cells exhibit prominent cyclability for 700 cycles under 0.5 C with 96.5%capacity retention.The LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)∣SPEs∣Li cells deliver excellent long-term lifespan for 260 cycles with a high capacity retention of 91.9%and high average Coulombic efficiency(98.5%)under ambient conditions.This simple and effective hybrid SPE design strategy sheds a milestone significance light for high-voltage Li-metal batteries.展开更多
In order to ensure the reliability and accuracy of low voltage differential signaling(LVDS)used in remote test system serial data transmission,a(7,4)linear block code is proposed.At the expense of a certain effective ...In order to ensure the reliability and accuracy of low voltage differential signaling(LVDS)used in remote test system serial data transmission,a(7,4)linear block code is proposed.At the expense of a certain effective bandwidth,the bit error rate of data transmission is greatly reduced,and the reliability of data transmission is improved by adding monitoring symbols.The driver CLC001 and the adaptive equalizer CLC012 are used as hardwares to compensate the attenuation of the signal in the long line transmission,improve the signal integrity and ensure the reliability of data transmission.Proved by simulation on a shielded twisted pair cable with a total length of 100 m,this system realizes zero bit error transmission of the serial data at the rate of 240 Mbit/s.展开更多
This study focuses on modeling the effects of deep hole traps, mainly the effect of the substrate（backgating effect） in a GaAs transistor MESFT. This effect is explained by the existence, at the interface, of a spac...This study focuses on modeling the effects of deep hole traps, mainly the effect of the substrate（backgating effect） in a GaAs transistor MESFT. This effect is explained by the existence, at the interface, of a space charge zone. Any modulation in this area leads to response levels trapping the holes therein to the operating temperature. We subsequently developed a model treating the channel substrate interface as an N–P junction, allowing us to deduce the time dependence of the component parameters of the total resistance R ds, the pinch-off voltage V P, channel resistance, fully open R co and the parasitic series resistance R S to bind the effect trap holes H1and H0. When compared with the experimental results, the values of the R DS（t S/ model for both traps show that there is an agreement between theory and experiment; it has inferred parameter traps, namely the density and the time constant of the trap. This means that a space charge region exists at the channel–substrate interface and that the properties can be approximated to an N–P junction.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52202236 and 5202780089)China Postdoctoral Science Foundation(Nos.2024T170300 and 2022M711232).
文摘Solid-state polymer electrolytes(SPEs)are candidate schemes for meeting the safety and energy density needs of advanced lithium-based battery because of their improved mechanical and electrochemical stability compared to traditional liquid electrolytes.However,low ionic conductivity and side reactions occurring in traditional high-voltage lithium metal batteries(LMBs)hinder their practical applications.Here,amino-modified metal-organic frameworks(UiO-66-NH_(2))with abundant defects as multifunctional fillers in the polyurethane based SPEs achieve the collaborative promotion of the mechanical strength and room temperature ionic conductivity.The surface modified amino groups serve as anchoring points for oxygen atoms of polymer chains,forming a firmly hydrogen-bond interface with polycarbonate-based polyurethane frameworks.The rich interfaces between UiO-66-NH_(2) and polymers dramatically decrease the crystallization of polymer chains and reduce ion transport impedance,which markedly boosted the ionic conductivity to 2.1×10^(−4) S·cm^(−1) with a high Li+transference numbers of 0.71.As a result,LiFePO4∣SPEs∣Li cells exhibit prominent cyclability for 700 cycles under 0.5 C with 96.5%capacity retention.The LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)∣SPEs∣Li cells deliver excellent long-term lifespan for 260 cycles with a high capacity retention of 91.9%and high average Coulombic efficiency(98.5%)under ambient conditions.This simple and effective hybrid SPE design strategy sheds a milestone significance light for high-voltage Li-metal batteries.
文摘In order to ensure the reliability and accuracy of low voltage differential signaling(LVDS)used in remote test system serial data transmission,a(7,4)linear block code is proposed.At the expense of a certain effective bandwidth,the bit error rate of data transmission is greatly reduced,and the reliability of data transmission is improved by adding monitoring symbols.The driver CLC001 and the adaptive equalizer CLC012 are used as hardwares to compensate the attenuation of the signal in the long line transmission,improve the signal integrity and ensure the reliability of data transmission.Proved by simulation on a shielded twisted pair cable with a total length of 100 m,this system realizes zero bit error transmission of the serial data at the rate of 240 Mbit/s.
文摘This study focuses on modeling the effects of deep hole traps, mainly the effect of the substrate（backgating effect） in a GaAs transistor MESFT. This effect is explained by the existence, at the interface, of a space charge zone. Any modulation in this area leads to response levels trapping the holes therein to the operating temperature. We subsequently developed a model treating the channel substrate interface as an N–P junction, allowing us to deduce the time dependence of the component parameters of the total resistance R ds, the pinch-off voltage V P, channel resistance, fully open R co and the parasitic series resistance R S to bind the effect trap holes H1and H0. When compared with the experimental results, the values of the R DS（t S/ model for both traps show that there is an agreement between theory and experiment; it has inferred parameter traps, namely the density and the time constant of the trap. This means that a space charge region exists at the channel–substrate interface and that the properties can be approximated to an N–P junction.
