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地方高校实验室安全管理提升策略探索

西部学刊 2024年第6期 119-122页

作者：牛娟李念强李孝峰苏州大学苏州215006 大连理工大学大连116024

通过调查问卷研究苏州市高校实验室安全管理现状,发现存在安全教育培训不透彻,安全意识有欠缺、管理制度不完善、应急处理能力不足、废弃物品处理不合规以及安全检查有疏漏等问题。针对上述问题,从实验室安全培训和教育、安全管理规章... 详细信息

通过调查问卷研究苏州市高校实验室安全管理现状,发现存在安全教育培训不透彻,安全意识有欠缺、管理制度不完善、应急处理能力不足、废弃物品处理不合规以及安全检查有疏漏等问题。针对上述问题,从实验室安全培训和教育、安全管理规章制度、安全检查与评估、安全应急预案等维度进行分析,并提出了相应的提升高校实验室安全管理策略。

关键词：高校实验室安全管理协同理论

Modulation properties of solitary and optically injected phased-array semiconductor lasers

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Photonics Research 2018年第9期6卷 908-917页

作者： nianqiang li H.SUSANTO B.R.CEMLYN I.D.HENNING M.J.ADAMS School of Computer Science and Electronic Engineering University of Essex Department of Mathematical Sciences University of Essex

We study modulation properties of two-element phased-array semiconductor lasers that can be described by coupled mode theory. We consider four different waveguide structures and modulate the array either in phase or out of phase within the phase-locked regions, guided by stability diagrams obtained from direct numerical simulations. Specifically, we find that out-of-phase modulation allows for bandwidth enhancement if the waveguide structure is properly chosen; for example, for a combination of index antiguiding and gain-guiding, the achievable modulation bandwidth in the case of out-of-phase modulation could be much higher than the one when they are modulated in phase. Proper array design of the coupling, controllable in terms of the laser separation and the frequency offset between the two lasers, is shown to be beneficial to slightly improve the bandwidth but not the resonance frequency, while the inclusion of the frequency offset leads to the appearance of double peak response curves. For comparison, we explore the case of modulating only one element of the phased array and find that double peak response curves are found. To improve the resonance frequency and the modulation bandwidth, we introduce simultaneous external injection into the phased array and modulate the phased array or its master light within the injection locking region. We observe a significant improvement of the modulation properties, and in some cases, by modulating the amplitude of the master light before injection,the resulting 3 dB bandwidths could be enhanced up to 160 GHz. Such a record bandwidth for phased-array modulation could pave the way for various applications, notably optical communications that require high-speed integrated photonic devices.

关键词：半导体激光器发展现状通讯技术技术创新

基于光注入半导体激光器的宽带雷达信号产生及应用

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半导体光电 2022年第1期43卷 12-20页

作者：周沛李念强潘时龙南京航空航天大学电子信息工程学院雷达成像与微波光子技术教育部重点实验室南京211106 苏州大学光电科学与工程学院教育部现代光学技术重点实验室江苏苏州215006

由于具有动力学特性丰富、体积小和易集成等优点,基于半导体激光器的信号产生技术已成为高性能微波光子信号产生的优选方案之一。半导体激光器在合适的外光注入条件下能够工作在单周期振荡态,可突破本征弛豫振荡频率的限制,产生频率大... 详细信息

由于具有动力学特性丰富、体积小和易集成等优点,基于半导体激光器的信号产生技术已成为高性能微波光子信号产生的优选方案之一。半导体激光器在合适的外光注入条件下能够工作在单周期振荡态,可突破本征弛豫振荡频率的限制,产生频率大范围可调的微波信号;进一步动态地控制注入参数,能够生成宽带可重构的微波调频信号,在雷达领域具有重要的应用前景。文章首先介绍了基于光注入半导体激光器的宽带微波信号生成机理并实验产生了大时宽带宽积的微波线性调频信号,其中心频率、带宽、时宽和工作频段均可灵活调谐;然后,构建了延时匹配光电反馈环路,提升了宽带微波调频信号的频谱纯度和梳齿信噪比等性能参数;最后,基于该高性能宽带微波调频信号发生器构建了微波光子雷达验证系统,分析了其在目标探测与成像方面的性能。

关键词：半导体激光器微波光子学光注入线性调频信号雷达

Leaching kinetics of fluorine during the aluminum removal from spent li-ion battery cathode materials

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Journal of Environmental Sciences 2024年第4期138卷 312-325页

作者： Shengjie li Jianxin Zhu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The high content of aluminum(Al)impurity in the recycled cathode powder seriously affects the extraction efficiency of Nickel,Cobalt,Manganese,and lithium resources and the actual commercial value of recycled materials,so Al removal is crucially important to conform to the industrial standard of spent li-ion battery cathode *** this work,we systematically investigated the leaching process and optimum conditions associated with Al removal from the cathode powder materials collected in a wet cathode-powder peeling and recycling production line of spent li-ion batteries(liBs).Moreover,we specifically studied the leaching of fluorine(F)synergistically happened along with the removal process of Al,which was not concerned about in other studies,but one of the key factors affecting pollution prevention in the recovery *** mechanism of the whole process including the leaching of Al and F from the cathode powder was indicated by using NMR,FTIR,and XPS,and a defluoridation process was preliminarily investigated in this *** leaching kinetics of Al could be successfully described by the shrinking core model,controlled by the diffusion process and the activation energy was 11.14 kJ/***,the leaching of F was attributed to the dissolution of liPF6and decomposition of PVDF,and the kinetics associated was described by Avrami *** interaction of Al and F is advantageous to realize the defluoridation to some *** is expected that our investigation will provide theoretical support for the large-scale recycling of spent liBs.

关键词： Al removal F leaching Cathode powder Heating alkali leaching Leaching kinetics

Additives strategies to improving cycling stability of li metal batteries by modifying electrode electrolyte interphases

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Progress in Natural Science:Materials International 2024年第2期34卷 338-344页

作者： Yuan li Pengfei Huang Chunyu Cui Xiaoyuan Ma li Chen Zekun li linhai li Yuhong Tian School of Biological and Chemical Engineering Guangxi University of Science and Technology School of College of Chemistry and Chemical Engineering Hunan University Isky Future Energy Institute

li metal batteries（LMBs） have attracted much attention due to the ultra-high theoretical capacity of the li metal anode（LMA）.However,the uncontrollable dendrites growth and low coulombic efficiency hinder their practical ***,we explore 3,5-difluoropyridine（2F-BD） as a novel electrolyte additive to enable highperformance *** 2F-BD additive participates in and modifies the solvation structure of li ions by reducing the coordinated number of PF6-at the electrode surface,leading to the formation of a liF and li3N-rich solid electrolyte interphase（SEI）.The liF component increases the robustness of SEI and suppresses the formation of li dendrites,while the li3N component facilitates the transportation and reaction kinetics of li *** a result,the li‖li symmetric cell presents a stable cycling performance of up to 500 h at a current density of 1 mA *** coupling with liFePO4cathode,the obtained full cell achieves high specific capacities of 106.06 mA h g-1and 84.98 mA h g-1at 2.55 mA cm-2and 5.10 mA cm-2,respectively,and maintains a high capacity retention of84.0% after 1000 cycles at 0.13 mA cm-2,with an average cycling CE of 99.58%.

关键词： Electrolyte additive li dendrites li metal batteries liF and li3N-Rich electrode-electrolyte interphase liFePO4 cathode

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基于电吸收调制激光器的双功能微波光子系统

光子学报 2023年第1期52卷 99-105页

作者：江芝东谢溢锋周沛唐志刚李念强苏州大学光电科学与工程学院苏州215006 苏州大学教育部现代光学技术重点实验室苏州215006

提出了一种基于电吸收调制激光器的双功能系统,可以同时实现微波信号的产生和其相位噪声的测量。该系统由基于电吸收调制激光器的光电振荡器模块和基于光延时线技术的相位噪声测量模块构成。通过使用单个电吸收调制激光器代替激光源和... 详细信息

提出了一种基于电吸收调制激光器的双功能系统,可以同时实现微波信号的产生和其相位噪声的测量。该系统由基于电吸收调制激光器的光电振荡器模块和基于光延时线技术的相位噪声测量模块构成。通过使用单个电吸收调制激光器代替激光源和强度调制器,所提出的双功能系统不仅成本低廉、结构简单,而且性能表现优异;有利于在基于OEO的射频系统,特别是信号产生系统的研制、优化与工作过程中,及时评估信号源的质量并作出相应的参数调整以优化其性能,为光电振荡器的相位噪声测试提供了简单的解决方案。实验结果表明,由光电振荡器生成的9.952 GHz信号的边模抑制比为66dB,相位噪声为-116.53dBc/Hz@10kHz。此外,相位噪声测量系统的相位噪声基底达-133.71 dBc/Hz@10 kHz,其测量灵敏度优于商用信号分析仪R&S FSV40。

关键词：相位噪声测量微波信号产生微波光子光电振荡器电吸收调制激光器

SEI/dead li-turning capacity loss for high-performance anode-free solid-state lithium batteries

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Journal of Energy Chemistry 2024年第9期96卷 145-152页

作者： Qianwen Yin Tianyu li Hongzhang Zhang Guiming Zhong Xiaofei Yang Xianfeng li Division of Energy Storage Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Long-Duration and Large-Scale Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Laboratory of Advanced Spectro-Electrochemistry and lithium-Ion Batteries Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Anode-free solid-state lithium metal batteries(AF-SSLBs)have the potential to deliver higher energy density and improved safety beyond lithium-metal ***,the unclear mechanism for the fast capacity decay in AF-SSLBs,either determined by dead li or solid electrolyte interface(SEI),limits the proposal of effective strategies to prolong cycling *** clarify the underlying mechanism,herein,the evolution of SEI and dead li is quantitatively analyzed by a solid-state nuclear magnetic resonance(ss-NMR)technology in a typical liPF6-based polymer *** results show that the initial capacity loss is attributed to the formation of SEI,while the dead li dominates the following capacity loss and the growth rate is 0.141 mA h cm^(−2)cycle−*** reduce the active li loss,the combination of inorganic-rich SEI and self-healing electrostatic shield effect is proposed to improve the reversibility of li deposition/dissolution behavior,which reduces the capacity loss rate for the initial SEI and following dead li generation by 2.3 and 20.1 folds,*** a result,the initial Coulombic efficiency(ICE)and stable CE increase by 15.1%and 15.3%in li-Cu cells,which guides the rational design of high-performance AF-SSLBs.

关键词： Solid-state lithium batteries Solid-state NMR Anode-free SEI Dead li

Synergy effect of regulated li-plating and functional solid electrolyte interphase on graphite anodes

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Nano Research 2024年第9期17卷 8077-8085页

作者： Panpan Wang Baojia Xia Jianling li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 201800China

The growth of li dendrites poses potential safety hazard to lithium-ion batteries(liBs),and eliminating li dendrites thoroughly stills face tough difficulties ***,regulating li-plating is a critical optimization-direction to address the ***,a“graphite-li hybrid”anode with high reversibility is realized under the constant-capacity lithiation(CCL).Within CCL,the uniform distribution of li-plating on the graphite surface is successfully *** evolution in different states of solid electrolyte interphase(SEI)is investigated in detail to study the interaction between the potentials and impedance during the process of liintercalation and *** the potential below 0 V and the state of charge(SOC)of 110%relative to the theoretical capacity,the F-rich SEI with high stability is constructed to hinder the emergency of li dendrites and maintain the intact structure of graphite anode under long *** cell presents more than 100%Coulombic efficiency(CE)with the 900 cycles,demonstrating the reversible li-plating and the utilization of *** the CCL half-cell provides a good cycling performance and specific capacity of 900 cycles at 0.5 C,it is attributed to the synergy effect of stable inorganic-rich SEI and regulated active li-plating.

关键词： "graphite-li hybrid"anode li-plating reversibility solid electrolyte interphase(SEI)

PREPARATION OF Ti-Al BASED NANOPHASE COMPOSITE POWDER BY MECHANICAL ALLOYING

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中国有色金属学会会刊：英文版 1997年第4期7卷 2-5页

作者： Wu nianqiang, Wu Jinming, li Wu , Wang Guangxin, li Zhizhang Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 Hangzhou Institute of Applied Technology

ＰＲＥＰＡＲＡＴＩＯＮＯＦＴｉＡｌＢＡＳＥＤＮＡＮＯＰＨＡＳＥＣＯＭＰＯＳＩＴＥＰＯＷＤＥＲＢＹＭＥＣＨＡＮＩＣＡＬＡＬＬＯＹＩＮＧ①ＷｕＮｉａｎｑｉａｎｇ，ＷｕＪｉｎｍｉｎｇ，ＬｉＷｕ，ＷａｎｇＧｕａｎｇｘｉｎ，... 详细信息

ＰＲＥＰＡＲＡＴＩＯＮＯＦＴｉＡｌＢＡＳＥＤＮＡＮＯＰＨＡＳＥＣＯＭＰＯＳＩＴＥＰＯＷＤＥＲＢＹＭＥＣＨＡＮＩＣＡＬＡＬＬＯＹＩＮＧ①ＷｕＮｉａｎｑｉａｎｇ，ＷｕＪｉｎｍｉｎｇ，ＬｉＷｕ，ＷａｎｇＧｕａｎｇｘｉｎ，ＬｉＺｈｉｚｈａｎｇＤｅｐａｒｔｍ...

关键词： composite Ti Al C system mechanical alloying