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Recent progress in visualization and digitization of coherent transformation structures and application in high-strength steel

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1298-1310页

作者： xuelin wang Zhenjia Xie Xiucheng li Chengjia shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China

High-strength steels are mainly composed of medium-or low-temperature microstructures,such as bainite or martensite,with coherent transformation *** type of microstructure has a high density of dislocations and fine crystallographic structural units,which ease the coordinated matching of high strength,toughness,and ***,given its excellent welding perform-ance,high-strength steel has been widely used in major engineering constructions,such as pipelines,ships,and ***,visual-ization and digitization of the effective units of these coherent transformation structures using traditional methods(optical microscopy and scanning electron microscopy)is difficult due to their complex ***,the establishment of quantitative relationships with macroscopic mechanical properties and key process parameters presents additional *** article reviews the latest progress in microstructural visualization and digitization of high-strength steel,with a focus on the application of crystallographic methods in the development of high-strength steel plates and *** obtained the crystallographic data(Euler angle)of the transformed microstruc-tures through electron back-scattering diffraction and combined them with the calculation of inverse transformation from bainite or martensite to austenite to determine the reconstruction of high-temperature parent austenite and orientation relationship(OR)during con-tinuous cooling ***,visualization of crystallographic packets,blocks,and variants based on actual OR and digit-ization of various grain boundaries can be effectively completed to establish quantitative relationships with alloy composition and key process parameters,thereby providing reverse design guidance for the development of high-strength steel.

关键词： high-strength steel microstructure visualization digitization quantification mechanical properties

Homogenous coating of li^(+)conductive li_(5)AlO_(4)on single-crystalline nonstoichiometric li_(1.04)Ni_(0.92)Al_(0.04)O_(2)for rechargeable lithium-ion batteries

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Journal of Energy Chemistry 2024年第8期95卷 651-659,I0014页

作者： Guoyu ding Shizhou wang Jinhan li Ziyan wu Jiayu Chen Jiayong Du Xinhui Huang Kuiming liu Yudong Zhang Zhonghan wu Yiyang Peng Qiancheng Zhao Meng Yu Fangyi Cheng Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Engineering Research Center of High-efficiency Energy Storage(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Advanced Chemical Power Sources Nankai UniversityTianjin 300071China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Cobalt-free,nickel-rich liNi_(1-x)Al_(x)O_(2)(x≤0.1)is an attractive cathode material because of high energy density and low cost but suffers from severe structural degradation and poor rate *** this study,we propose a molten salt-assisted synthesis in combination with a li-refeeding induced aluminum segregation strategy to prepare li_(5)AlO_(4)-coated single-crystalline slightly li-rich li_(1.04)Ni_(0.92)Al_(0.04)O_(2).The symbiotic formation of li_(5)AlO_(4)from reaction between molten lithium hydroxide and doped aluminum in the bulk ensures a high lattice matching between the Ni-rich oxide and the homogenous conductive li_(5)AlO_(4)that permits high li^(+)*** from mitigated undesirable side reactions and phase evolution,the li_(5)AlO_(4)-coated single-crystalline li_(1.04)Ni_(0.92)Al_(0.04)O_(2)delivers a high specific capacity of220.2 mA h g^(-1)at 0.1 C and considerable rate capability(182.5 mA h g^(-1)at 10 C).Besides,superior capacity retention of 90.8%is obtained at 1/3 C after 100 cycles in a 498.1 mA h pouch full ***,the particulate morphology of li_(1.04)Ni_(0.92)Al_(0.04)O_(2)remains intact after cycling at a cutoff voltage of 4.3 V,whereas slightly li-deficient li_(0.98)Ni_(0.97)Al_(0.05)O_(2)features intragranular cracks and irreversible lattice *** results highlight the value of molten salt-assisted synthesis and li-refeeding induced elemental segregation strategy to upgrade Ni-based layered oxide cathode materials for advanced li-ion batteries.

关键词： Aluminum segregation Surface coating Nonstoichiometric oxides Molten synthesis Cathode materials

Boosting the performance of liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) electrode by uniform li_(3)PO_(4) coating via atomic layer deposition

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Chinese Chemical Letters 2024年第5期35卷 499-503页

作者： Mingjiao Lu Zhixing wang Gui Luo Huajun Guo Xinhai li Guochun Yan Qihou li Xianglin li ding wang Jiexi wang School of Metallurgy and Environment Central South UniversityChangsha 410083China BASF shanshan Battery Materials Co. Ltd.Changsha 410006China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China National and Local Joint Engineering Laboratory for lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

Ultra-high nickel material is considered to be a promising cathode ***,with the increase of nickel content,the interfacial side reactions between the cathode and electrolyte become increasingly ***,an atomically controllable ionic conductor li_(3)PO_(4)(LPO)coating is deposited on the liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2)(NCM9064)based electrode by the atomic layer deposition *** results shows that the LPO coating is uniformly and densely covered on the surface of secondary particles of NCM9064,helping to prevent the direct contact between the electrolyte and cathode during the chargingdischarging *** addition,the coating layer is electrochemically *** a result,the interfacial side reactions during the long cycle are effectively suppressed,and the solid electrolyte interphase layer at the interface is *** electrode with 20 layers of LPO deposition(ALD-LPO-20)exhibits an excellent capacity retention of 81%after 200 cycles in 2.8-4.3 V at 25℃,which is 18%higher than the unmodified material(ALD-LPO-0).Besides,the moderate LPO coating improves the rate capability and high temperature cycling performance of *** study provides a method for the modification of ultra-high nickel cathode materials and corresponding electrodes.

关键词： Ultra-high nickel material liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) Atomic layer deposition li_(3)PO_(4) Ionic conductor

Regulating surface electron structure of PtNi nanoalloy via boron doping for high‐current‐density li‐O2 batteries with low overpotential and long‐life cyclability

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SmartMat 2024年第1期5卷 110-120页

作者： Yajun ding Yuanchao Huang Yuejiao li Tao Zhang Zhong‐Shuai wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhouChina Institute of Advanced Semiconductors Hangzhou Innovation CenterZhejiang UniversityHangzhouChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalianChina

The realization of high‐efficiency,reversible,stable,and safe li‐O2 batteries is severely hindered by the large overpotential and side reactions,especially at high rate ***,rational design of cathode catalysts with high activity and stability is crucial to overcome the terrible issues at high current ***,we report a surface engineering strategy to adjust the surface electron structure of boron(B)‐doped PtNi nanoalloy on carbon nanotubes(PtNiB@CNTs)as an efficient bifunctional cathodic catalyst for high‐rate and long‐life li‐O2 ***,the li‐O2 batteries assembled with as‐prepared PtNiB@CNT catalyst exhibit ultrahigh discharge capacity of 20510 mA·h/g and extremely low overpotential of 0.48 V at a high current density of 1000 mA/g,both of which outperform the most reported Pt‐based catalysts ***,our li‐O2 batteries offer excellent rate capability and ultra‐long cycling life of up to 210 cycles at 1000 mA/g under a fixed capacity of 1000 mA·h/g,which is two times longer than those of Pt@CNTs and PtNi@***,it is revealed that surface engineering of PtNi nanoalloy via B doping can efficiently tailor the electron structure of nanoalloy and optimize the adsorption of oxygen species,consequently delivering excellent li‐O2 battery ***,this strategy of regulating the nanoalloy by doping nonmetallic elements will pave an avenue for the design of high‐performance catalysts for metal‐oxygen batteries.

关键词： B doping bifunctional catalyst li‐O2 battery low charge overpotential PtNi nanoalloy

Peculiarity of transcriptional and H3K27me3 dynamics during peach bud dormancy

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Horticultural Plant Journal 2024年第1期10卷 38-50页

作者： yalin Zhao Yong li Ke Cao Weichao Fang Changwen Chen Xinwei wang Jinlong wu Wenwu Guo lirong wang The Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(Fruit Tree Breeding Technology) Ministry of AgricultureZhengzhou Fruit Research InstituteChinese Academy of Agricultural SciencesZhengzhouHenan 450009China Western Research Institute Chinese Academy of Agricultural SciencesChangjiXinjiang 831100China College of Horticulture and Forestry Science Huazhong Agricultural UniversityWuhanHubei 430070China

Bud dormancy facilitates the survival of meristems under harsh environmental *** elucidate how molecular responses to chilling accumulation controlling dormancy in peach buds,chromatin immunoprecipitation sequencing to identify the H3K27me3 modifications and RNA sequencing of two peach cultivars with pronounced differences in chilling requirement were carried out,the results showed that genes associated with abscisic acid and gibberellic acid signal pathways play key roles in dormancy *** results demonstrated that peach flower bud differentiation occurred continuously in both cultivars during chilling accumulation,which was correlated with the transcript abundance of key genes involved in phytohormone metabolism and flower bud development under adverse *** more increased strength in high chillingrequirement cultivar along with the chilling accumulation at the genome-wide *** function of the dormancy-associated MADS-box gene PpDAM6 was identified,which is involved in leaf bud break in peach and flower development in transgenic Nicotiana tabacum(NC89).In addition,PpDAM6 was positively regulated by PpCBF,and the genes of putative dormancy-related and associated with metabolic pathways were *** together,these results constituted a theoretical basis for elucidating the regulation of peach bud dormancy transition.

关键词： Peach bud Dormancy RNA-seq H3K27me3 Chilling requirement

Boosting reversible charging of li-ion batteries at low temperatures by a synergy of propylene carbonate-based electrolyte and defective graphite

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Nano Research 2024年第3期17卷 1491-1499页

作者： Yingqiang wu Jiao Zhang Jinli liu li Sheng Bo Zhang limin wang Siqi Shi li wang Hong Xu Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences(CAS)Changchun 130022China China National Quality Supervision and Inspection Center for Industrial Explosive Materials Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Materials Genome InstituteShanghai UniversityShanghai 200444China

Propylene carbonate(PC)-based electrolytes have exhibited significant advantages in boosting the low-temperature discharging of graphite-based li-ion ***,it is still unclear whether they can improve the charging property and suppress lithium *** this topic is challenging due to the problem of electrochemical *** overcome this issue,we introduced graphite with phase *** results show that the pouch-type full batteries using PC-based electrolyte exhibit steady performance over 500 cycles and can be reversibly charged over 30 times at-20℃ with an average Coulombic efficiency of 99.95%,while the corresponding value for the conventional ethylene carbonate(EC)-based electrolyte sample is only 31.20%.This indicates that the use of PC-based electrolyte significantly suppresses lithium plating during low-temperature *** further demonstrate that the improved performance is mainly attributed to the unique solvation structure,where PF-6more anions participate in solvation,leading to the formation of a stable F-rich solid state electrolyte interface on the graphite surface and a lower reduction tendency of li+*** work inspires new ideas for the design of PC-based electrolytes for low-temperature charging and fast-charging batteries.

关键词： lithium-ion batteries graphite propylene carbonate low-temperature charging

Tuning li/Ni mixing by reactive coating to boost the stability of cobalt-free Ni-rich cathode

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Journal of Energy Chemistry 2024年第10期97卷 20-29页

作者： Fanghui Du Xitong Zhang Yingchao wang Lei ding Pengfang Zhang lingyang liu Dong wang Jianzong Man Yuling Chen Yunwu li shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology and School of Chemistry and Chemical Engineering Liaocheng University School of Materials Science and Engineering Yancheng Institute of Technology

Cobalt-free cathode materials are attractive for their high capacity and low cost,yet they still encounter issues with structural and surface ***4,in particular,has garnered attention as an effective stabilizer for bulk and ***,the impact of interfacial reactions and elemental interdiffusion between AlPO4and liNi0.95Mn0.05O2upon sintering on the bulk and surface remains *** this study,we demonstrate that during the heat treatment process,AlPO4decomposes,resulting in Al doping into the bulk of the cathode through elemental ***,PO43-reacts with the surface li of material to form a li3PO4coating,inducing lithium deficiency,thereby increasing li/Ni *** suitable li/Ni mixing,previously overlooked in AlPO4modification,plays a pivotal role in stabilizing the bulk and surface,exceeding the synergy of Al doping and *** presence of Ni2+ions in the lithium layers contributes to the stabilization of the delithiated structure via a structural pillar ***,suitable li/Ni mixing can stabilize the lattice oxygen and electrode-electrolyte interface by increasing oxygen removal energy and reducing the overlap between the Ni3+/4+egand O2-2p *** findings offer new perspectives for the design of stable cobalt-free cathode materials.

关键词： Al doping Cobalt-free Ni-rich cathode li/Ni mixing li3PO4 coating lithium-ion batteries

Advanced System-Level Model Reduction Method for Multi-Converter DC Power Systems

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1550-1562页

作者： lin Zhu Xueshen Zhao Xialin li li Guo Bo Zhao Zhanfeng Deng Hao Lu chengshan wang the Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China the Research Institute of State Grid Zhejiang Electric Power Co. Ltd.Hangzhou 310014China the State Grid Global Energy Interconnection Research Institute Beijing 102209China

For dynamic stability analysis and instability mechanism understanding of multi-converter medium voltage DC power systems with droop-based double-loop control,an advanced system-level model reduction method is *** this method,mathematical relationships of control parameters(e.g.,current and voltage control parameters)between the system and its equivalent reduced-order model are ***,open-loop and closed-loop equivalent reduced-order models of current control loop considering dynamic interaction among converters are *** instability mechanism(e.g.,unreasonable current control parameters)of the system can be revealed *** guidance for adjustment of current control parameters can also be ***,considering dynamic interaction of current control among converters,open-loop and closed-loop equivalent reduced-order models of voltage control loop are *** frequency and damping factor of DC bus voltage in a wide oscillation frequency range(e.g.,10–50 Hz)can be evaluated *** importantly,accuracy of advanced system-level model reduction method is not compromised,even for MVDC power systems with inconsistent control parameters and different number of ***,experiments in RT-BOX hardware-in-the-loop experimental platform are conducted to validate the advanced system-level model reduction method.

关键词： Closed-loop reduced-order model instability mechanism open-loop reduced-order model stability analysis system-level model reduction method

Distribution of polarization squeezed light through a 20 km fiber channel

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Science China(Information Sciences) 2024年第5期67卷 343-344页

作者： Chao li Siyu REN Yanru YAN yalin li Meihong wang Xiaolong SU State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

Polarization squeezed light plays a key role in quantum memory by transferring quantum information between atoms and photons [1], and has potential applications in quantum precision measurement [2]. For polarization squeezed light, the quantum variance of at least one Stokes operator is smaller than that of the coherent *** with the quadrature squeezed state, polarization squeezed light has the following advantages: one is that it is a bright beam, and the other is that it can be measured directly without using a local oscillator.

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