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One-time sintering process to modify xLi2MnO3(1-x)LiMO2 hollow architecture and studying their enhanced electrochemical performances

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Journal of Energy Chemistry 2020年第11期29卷 271-279页

作者： Renheng Wang Yiling Sun Kaishuai Yang Junchao Zheng Yan Li zhengfang qian Zhenjiang He Shengkui Zhong College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060GuangdongChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina School of Marine Science and Technology Hainan Tropical Ocean UniversitySanya 572000HainanChina College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

To solve the critical problems of lithium rich cathode materials, e.g., structure instability and short cycle life, we have successfully prepared a ZrO2-coated and Zr-doping xLi2MnO3·(1–x)LiMO2 hollow architecture via one-time sintering process. The modified structural materials as lithium-ion cathodes present good structural stability and superior cycle performance in LIBs. The discharge capacity of the ZrO2-coated and Zr-doped hollow pristine is 220 mAh g-1 at the 20th cycle at 0.2 C(discharge capacity loss, 2.7%)and 150 m Ah g-1 at the 100 th cycle at 1 C(discharge capacity loss, 17.7%), respectively. However, hollow pristine electrode only delivers 203 m Ah g-1 at the 20 th cycle at 0.2 C and 124 mAh g-1 at the 100 th cycle at 1 C, respectively, and the corresponding to capacity retention is 92.2% and 72.8%, *** coefficients of modified hollow pristine electrode are much higher than that of hollow pristine electrode after 100 cycles(approach to 1.4 times). In addition, we simulate the adsorption reaction of HF on the surface of ZrO2-coated layer by the first-principles theory. The calculations prove that the adsorption energy of HF on the surface of ZrO2-coated layer is about-1.699 e V, and the ZrO2-coated layer could protect the hollow spherical xLi2MnO3·(1–x)LiMO2 from erosion by HF. Our results would be applicable for systematic amelioration of high-performance lithium rich material for anode with the respect of practical application.

关键词： Lithium rich cathode materials One-time sintering process Coated and doped Electrochemical performances First-principles calculations

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Facile and scalable fabrication of lithiophilic Cu_(x)O enables stable lithium metal anode

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Journal of Energy Chemistry 2022年第12期75卷 285-292,I0007页

作者： Yanmei Nie Xiangyu Dai Jiexi Wang zhengfang qian Zhixing Wang Huajun Guo Guochun Yan Dongting Jiang Renheng Wang Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060GuangdongChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

Equipped with highest-energy density anode,lithium metal batteries are of great interests for the nextgeneration energy storage ***,the existing problems like uneven Li deposition,large volume expansion and short cycling lifespan severely retard the implementation of Li metal ***,we report an in-situ formed Cu_(x)O nanofiber network synthesized by facile and scalable calcination process and employ as stable lithium metal *** CuO/Cu_(2)O ratio in the lithiophilic Cu_(x)O network can be adjusted through an optimal annealing time,thus guiding the homogeneous distribution of Li atoms and regulating the repeated plating/stripping *** a result,Li@Cu_(x)O 3D scaffold displays an ultralow overpotential of 7.7 mV,long cycling life for more than 1000 h in symmetric cell,and exceptional stability for LiFePO_(4)//Li full *** work provides guidelines for the design and fabrication of lithiophilic 3D matrixes and advances the practical use of lithium metal batteries.

关键词： Lithium metal batteries 3D collectors Lithiophilic modification

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Influence of non-uniform electric field distribution on the atmospheric pressure air dielectric barrier discharge

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Plasma Science and Technology 2021年第7期23卷 78-84页

作者： Weisheng CUI Shuai ZHAO zhengfang qian Yiling SUN Mahmoud AL-SALIHI Xiangquan DENG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094People’s Republic of China

The dielectric barrier discharge(DBD)in air at atmospheric pressure is not suitable for industrial applications due to its randomly distributed discharge *** this paper,the influence of the electric field distribution on the uniformity of DBD is theoretically analyzed and experimentally *** is found that a certain degree of uneven electric field distributions can control the development of electron avalanches and regulate their transition to streamers in the *** discharge phenomena and electrical characteristics prove that an enhanced Townsend discharge can be formed in atmospheric-pressure air with a curved-plate *** spectral analysis further confirms that the gas temperature of the plasma produced by the curved-plate electrode is close to room temperature,which is beneficial for industrial *** paper presents the relationship between the electron avalanche transition and the formation of a uniform DBD,which can provide some references for the development and applications of the DBD in the future.

关键词： dielectric barrier discharge electric field distribution electron avalanche Townsend discharge

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Switchable hidden spin polarization and negative Poisson's ratio in two-dimensional antiferroelectric wurtzite crystals

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Journal of Semiconductors 2023年第12期44卷 72-80页

作者： Zhuang Ma Jingwen Jiang Gui Wang Peng Zhang Yiling Sun zhengfang qian Jiaxin Zheng Wen Xiong Fei Wang Xiuwen Zhang Pu Huang Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Advanced Materials Peking UniversityShenzhen Graduate SchoolShenzhen 518055China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Renewable and Sustainable Energy Institute University of ColoradoBoulderColorado 80309USA

Two-dimensional(2D)antiferroelectric materials have raised great research interest over the last ***,we reveal a type of 2D antiferroelectric(AFE)crystal where the AFE polarization direction can be switched by a certain degree in the 2D *** 2D functional materials are realized by stacking the exfoliated wurtzite(wz)monolayers with“self-healable”nature,which host strongly coupled ferroelasticity/antiferroelectricity and benign *** AFE candidates,i.e.,Zn X and Cd X(X=S,Se,Te),are all semiconductors with direct bandgap atΓpoint,which harbors switchable antiferroelectricity and ferroelasticity with low transition barriers,hidden spin polarization,as well as giant in-plane negative Poisson's ratio(NPR),enabling the co-tunability of hidden spin characteristics and auxetic magnitudes via AFE *** 2D AFE wz crystals provide a platform to probe the interplay of 2D antiferroelectricity,ferroelasticity,NPR,and spin effects,shedding new light on the rich physics and device design in wz semiconductors.

关键词： wurtzite crystal multiferroics hidden spin polarization negative Poisson's ratio

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Influence of Ti_(3)C_(2)T_(x)(MXene)on the generation of dielectric barrier discharge in air

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Plasma Science and Technology 2021年第11期23卷 66-73页

作者： Weisheng CUI Qiaolu LIN Hongbo LI Shuai ZHAO Yunge ZHANG Yifan HUANG Shuting FAN Yiling SUN zhengfang qian Renheng WANG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094People's Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055People's Republic of China

The formation of homogeneous dielectric barrier discharge(DBD)in air is a key scientific problem and core technical problem to be solved for the application of ***,we report the effect of two-dimensional(2D)nanomaterial Ti_(3)C_(2)T_(x)(Tx=-F,-O and/or-OH)on regulating the electrical discharge *** field emission and weak bound state property of Ti_(3)C_(2)T_(x)can effectively increase the seed electrons and contribute to the generation of atmospheric pressure homogeneous air *** electron avalanche development for the uneven electrode structure is calculated,and the discharge mode transition is *** comparative analyses of discharge phenomena validate the regulation of Ti_(3)C_(2)T_(x)on the discharge characteristics of *** light emission capture and the voltage and current waveforms verify that the transition of Townsend discharge to streamer discharge is effectively *** optical emission spectra are used to characterize the plasma and confirm that it is in a non-equilibrium state and the gas temperature is at room *** is the first exploration of Ti_(3)C_(2)T_(x)on the regulation of electrical discharge characteristics as far as we *** work proves the feasibility of Ti_(3)C_(2)T_(x)as a source of seed electrons to form homogeneous DBD,establishing a preliminary foundation for promoting the application of atmospheric pressure non-equilibrium plasma.

关键词： atmospheric pressure air plasma Townsend discharge seed electron Ti_(3)C_(2)T_(x)

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Terahertz topological photonic waveguide switch for on-chip communication

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Photonics Research 2022年第4期10卷 1090-1096页

作者： Xudong Liu Jialiang Huang Hao Chen zhengfang qian JlNGWEN Ma Xiankai Sun Shuting Fan Yiwen Sun Department of Biomedical Engineering School of MedicineShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Terahertz(THz)topological photonic structures are promising for last-centimeter communication in intra/interchip communication systems because they support bit-error-free THz signal transmission with topological *** and dynamically tunable THz topological photonic components have not yet been experimentally ***,we experimentally demonstrate a THz topological switch(270-290 GHz)based on a valley Hall photonic crystal structured high-resistivity silicon substrate,in which the THz waves can be dynamically turned on/off by an external 447 nm continuous-wave *** device exhibited an on/off ratio of 19 dB under a pumping light intensity of 240 mW/mm^(2).The 3 dB switching bandwidth was〜60 kHz.

关键词： communication waveguide tunable

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SEVERAL RELIABILITY RELATED ISSUES FOR FLIP-CHIP PACKAGING

SEVERAL RELIABILITY RELATED ISSUES FOR FLIP-CHIP PACKAGING

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1998 5th International Conference on Solid-State and Integrated Circuit Technology

作者： Sheng Liu Jianjun Wang zhengfang qian Electronic Packaging Laboratory Mechanical Engineering Department Wayne State University DetroitMI 48202USA

＜正＞In this paper,several reliability-related mechanics problems in flip-chip packages are *** problems include failure modes（cracking and delamination） and prevention,underfill selection and design,board design,effect of processing induced defects（settling effect,incomplete fill, debonding）,ball pitch effect,solder joint fatigue,and reliability of conductive epoxy.

关键词： flip-chip cracking and delamination fatigue

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Real‑time detection of aging status of methylammonium lead iodide perovskite thin flms by using terahertz time‑domain spectroscopy

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Frontiers of Optoelectronics 2024年第3期17卷 39-50页

作者： Jinzhuo Xu Yinghui Wu Shuting Fan Xudong Liu Zhen Yin Youpeng Yang Renheng Wang zhengfang qian Yiwen Sun Department of Biomedical Engineering School of MedicineShenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Durability for Ocean Civil Engineering College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

The inadequate stability of organic–inorganic hybrid perovskites remains a signifcant barrier to their widespread commercial application in optoelectronic *** phenomena profoundly afect the optoelectronic performance of perovskite-based *** addition to enhancing perovskite stability,the real-time detection of aging status,aimed at monitoring the aging progression,holds paramount importance for both fundamental research and the commercialization of organic–inorganic hybrid *** this study,the aging status of perovskite was real-time investigated by using terahertz time-domain *** analysis consistently revealed a gradual decline in the intensity of the absorption peak at 0.968 THz with increasing perovskite ***,a systematic discussion was conducted on the variations in intensity and position of the terahertz absorption peaks as the perovskite *** fndings facilitate the real-time assessment of perovskite aging,providing a promising method to expedite the commercialization of perovskite-based optoelectronic devices.

关键词： Perovskite Terahertz spectroscopy Ageing Real-time detection

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摆线推进器水动力性能和流场结构预报方法研究

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中国造船 2018年第4期59卷 124-133页

作者：钱正芳胡健张纬康海军工程大学武汉430033 中国海洋开发研究中心北京100161 哈尔滨工程大学哈尔滨150001

为了更深入地探讨摆线推进器的水动力性能和周围流场的细节,采用CFD技术模拟计算摆线推进器的水动力性能。摆线推进器的扰动流场通过雷诺平均(RANS)方程计算,应用重叠网格技术模拟桨叶的转动。对自主设计的摆线推进器计算了给定工况下... 详细信息

为了更深入地探讨摆线推进器的水动力性能和周围流场的细节,采用CFD技术模拟计算摆线推进器的水动力性能。摆线推进器的扰动流场通过雷诺平均(RANS)方程计算,应用重叠网格技术模拟桨叶的转动。对自主设计的摆线推进器计算了给定工况下的水动力性能,并与试验值比较,两者趋势比较一致。在此基础上,进一步分析了桨叶表面的压力分布情况和流场的细节。研究结果表明,偏心率较大时摆线推进器的叶片转速很快,会引起涡结构的显著变化,这是产生推力的主要原因,也是流动不均匀性的主要原因。

关键词：摆线推进器数值模拟重叠网格流场分析

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波浪中水面船舶与拖曳系统耦合运动特性计算方法研究

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中国造船 2022年第5期63卷 71-81页

作者：孙小帅马骋钱正芳姚朝帮中国海洋开发研究中心北京100161 华中科技大学船舶与海洋工程学院武汉430074

针对波浪中水面船舶和拖曳系统的耦合运动特性问题,基于已建立的船体运动计算模型,采用有限差分法求解拖缆动力学方程。通过边界条件与拖体的6自由度运动耦合,建立了波浪中水面船舶与拖曳系统耦合运动特性的时域计算方法,模拟配备拖曳... 详细信息

针对波浪中水面船舶和拖曳系统的耦合运动特性问题,基于已建立的船体运动计算模型,采用有限差分法求解拖缆动力学方程。通过边界条件与拖体的6自由度运动耦合,建立了波浪中水面船舶与拖曳系统耦合运动特性的时域计算方法,模拟配备拖曳阵的水面船舶在规则波中的运动,分析船体和拖曳阵的相互影响。结果表明,拖曳阵对水面船舶耐波性的影响较小,主要原因在于拖缆首端与船体之间的夹角变化很小,导致拖缆首端拖点处的张力在船体垂直方向的分量变化较小。

关键词：拖曳系统耦合运动特性拖缆移动脉动源格林函数

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