Lithium-sulfur battery(LSB)has brought much attention and concern because of high theoretical specific capacity and energy density as one of main competitors for next-generation energy storage systems.The widely comme...Lithium-sulfur battery(LSB)has brought much attention and concern because of high theoretical specific capacity and energy density as one of main competitors for next-generation energy storage systems.The widely commercial application and development of LSB is mainly hindered by serious“shuttle effect”of lithium polysulfides(Li PSs),slow reaction kinetics,notorious lithium dendrites,etc.In various structures of LSB materials,array structured materials,possessing the composition of ordered micro units with the same or similar characteristics of each unit,present excellent application potential for various secondary cells due to some merits such as immobilization of active substances,high specific surface area,appropriate pore sizes,easy modification of functional material surface,accommodated huge volume change,enough facilitated transportation for electrons/lithium ions,and special functional groups strongly adsorbing Li PSs.Thus many novel array structured materials are applied to battery for tackling thorny problems mentioned above.In this review,recent progresses and developments on array structured materials applied in LSBs including preparation ways,collaborative structural designs based on array structures,and action mechanism analyses in improving electrochemical performance and safety are summarized.Meanwhile,we also have detailed discussion for array structured materials in LSBs and constructed the structure-function relationships between array structured materials and battery performances.Lastly,some directions and prospects about preparation ways,functional modifications,and practical applications of array structured materials in LSBs are generalized.We hope the review can attract more researchers'attention and bring more studying on array structured materials for other secondary batteries including LSB.展开更多
射频收发信机是射频识别系统中的一个重要组成部分。为了加深对EPC Class 1 Generation 2协议的理解、完成链路预算及一些指标测试,该文利用ADS(Advanced Design System)仿真软件、89601 VSA(Vector Signal Analyzer)软件以及Agilent公...射频收发信机是射频识别系统中的一个重要组成部分。为了加深对EPC Class 1 Generation 2协议的理解、完成链路预算及一些指标测试,该文利用ADS(Advanced Design System)仿真软件、89601 VSA(Vector Signal Analyzer)软件以及Agilent公司的各种仪器,外加一个真实的UHF频段的射频标签,来构成一个链路信号测试环境,这种新颖且相当具有实用价值的方案是对RFID(Radio Frequency Identification)阅读器及标签研发的一个强有力补充。通过仿真,深刻理解EPC Class1 Generation 2协议,完成了RFID链路的各种性能测试,为将来实际阅读器研发提供指导。展开更多
设计了一个S波段1∶4Wilkinson正交功率分配器。该功率分配器由3个1∶2 Wilkinson功率分配器二级级联构成,加入λ/4微带传输线,形成正交网络,同时对功率分配器进行了增益均衡设计,应用微波仿真软件ADS对电路进行了优化设计,给出了S参数...设计了一个S波段1∶4Wilkinson正交功率分配器。该功率分配器由3个1∶2 Wilkinson功率分配器二级级联构成,加入λ/4微带传输线,形成正交网络,同时对功率分配器进行了增益均衡设计,应用微波仿真软件ADS对电路进行了优化设计,给出了S参数仿真结果、电路版图及实物图,测试结果表明,在2.7-2.9 GHz工作频率范围内,输入输出端的驻波比〈1.3,隔离度〈-24 d B,插入损耗≤0.3 d B,相位偏差小于5°（相对于标准相位）。展开更多
基金This work was supported by the National Natural Science Foundation of China(52203066,51973157,61904123)the Tianjin Natural Science Foundation(18JCQNJC02900)+3 种基金the National innovation and entrepreneurship training program for college students(202310058007)the Tianjin Municipal college students’innovation and entrepreneurship training program(202310058088)the Science&Technology Development Fund of Tianjin Education Commission for Higher Education(Grant No.2018KJ196)the State Key Laboratory of Membrane and Membrane Separation,Tiangong University.
文摘Lithium-sulfur battery(LSB)has brought much attention and concern because of high theoretical specific capacity and energy density as one of main competitors for next-generation energy storage systems.The widely commercial application and development of LSB is mainly hindered by serious“shuttle effect”of lithium polysulfides(Li PSs),slow reaction kinetics,notorious lithium dendrites,etc.In various structures of LSB materials,array structured materials,possessing the composition of ordered micro units with the same or similar characteristics of each unit,present excellent application potential for various secondary cells due to some merits such as immobilization of active substances,high specific surface area,appropriate pore sizes,easy modification of functional material surface,accommodated huge volume change,enough facilitated transportation for electrons/lithium ions,and special functional groups strongly adsorbing Li PSs.Thus many novel array structured materials are applied to battery for tackling thorny problems mentioned above.In this review,recent progresses and developments on array structured materials applied in LSBs including preparation ways,collaborative structural designs based on array structures,and action mechanism analyses in improving electrochemical performance and safety are summarized.Meanwhile,we also have detailed discussion for array structured materials in LSBs and constructed the structure-function relationships between array structured materials and battery performances.Lastly,some directions and prospects about preparation ways,functional modifications,and practical applications of array structured materials in LSBs are generalized.We hope the review can attract more researchers'attention and bring more studying on array structured materials for other secondary batteries including LSB.
文摘射频收发信机是射频识别系统中的一个重要组成部分。为了加深对EPC Class 1 Generation 2协议的理解、完成链路预算及一些指标测试,该文利用ADS(Advanced Design System)仿真软件、89601 VSA(Vector Signal Analyzer)软件以及Agilent公司的各种仪器,外加一个真实的UHF频段的射频标签,来构成一个链路信号测试环境,这种新颖且相当具有实用价值的方案是对RFID(Radio Frequency Identification)阅读器及标签研发的一个强有力补充。通过仿真,深刻理解EPC Class1 Generation 2协议,完成了RFID链路的各种性能测试,为将来实际阅读器研发提供指导。
文摘设计了一个S波段1∶4Wilkinson正交功率分配器。该功率分配器由3个1∶2 Wilkinson功率分配器二级级联构成,加入λ/4微带传输线,形成正交网络,同时对功率分配器进行了增益均衡设计,应用微波仿真软件ADS对电路进行了优化设计,给出了S参数仿真结果、电路版图及实物图,测试结果表明,在2.7-2.9 GHz工作频率范围内,输入输出端的驻波比〈1.3,隔离度〈-24 d B,插入损耗≤0.3 d B,相位偏差小于5°（相对于标准相位）。
