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High-energy-density lithium manganese iron phosphate for lithium-ion batteries: Progresses, challenges, and prospects

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Journal of Energy Chemistry 2025年第1期100卷 1-17页

作者： Bokun Zhang Xiaoyun Wang Shuai Wang Yan Li Libo Chen Handong Jiao Zhijing Yu Jiguo Tu State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic University Institute of Advanced Structure technology Beijing Institute of Technology

The soaring demand for smart portable electronics and electric vehicles is propelling the advancements in high-energy–density lithium-ion *** manganese iron phosphate (LiMnxFe1-xPO4) has garnered significant attention as a promising positive electrode material for lithium-ion batteries due to its advantages of low cost,high safety,long cycle life,high voltage,good high-temperature performance,and high energy *** LiMnxFe1-xPO4has made significant breakthroughs in the past few decades,there are still facing great challenges in poor electronic conductivity and Li-ion diffusion,manganese dissolution affecting battery cycling performance,as well as low tap *** review systematically summarizes the reaction mechanisms,various synthesis methods,and electrochemical properties of LiMnxFe1-xPO4to analyze reaction processes accurately and guide material ***,the main challenges currently faced are concluded,and the corresponding various modification strategies are discussed to enhance the reaction kinetics and electrochemical performance of LiMnxFe1-xPO4,including multi-scale particle regulation,heteroatom doping,surface coating,as well as microscopic morphology ***,in view of the current research challenges faced by intrinsic reaction processes,kinetics,and energy storage applications,the promising research directions are *** importantly,it is expected to provide key insights into the development of high-performance and stable LiMnxFe1-xPO4materials,to achieve practical energy storage requirements.

关键词： Lithium manganese iron phosphate High energy density Lithium-ion batteries Reaction mechanism Tap density

Multi-layer multi-pass friction rolling additive manufacturing of Al alloy:Toward complex large-scale high-performance components

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International Journal of Minerals,Metallurgy and materials 2025年第2期32卷 425-438页

作者： Haibin Liu Run Hou Chenghao Wu Ruishan Xie Shujun Chen college of Mechanical&Energy Engineering Beijing University of TechnologyBeijing 100124China Chongqing Research Institute of beijing University of technology Chongqing 401121China

At present,the emerging solid-phase friction-based additive manufacturing technology,including friction rolling additive man-ufacturing(FRAM),can only manufacture simple single-pass *** this study,multi-layer multi-pass FRAM-deposited alumin-um alloy samples were successfully prepared using a non-shoulder tool *** material flow behavior and microstructure of the over-lapped zone between adjacent layers and passes during multi-layer multi-pass FRAM deposition were studied using the hybrid 6061 and 5052 aluminum *** results showed that a mechanical interlocking structure was formed between the adjacent layers and the adja-cent passes in the overlapped center *** friction and rolling of the tool head led to different degrees of lateral flow and plastic deformation of the materials in the overlapped zone,which made the recrystallization degree in the left and right edge zones of the over-lapped zone the highest,followed by the overlapped center zone and the non-overlapped *** tensile strength of the overlapped zone exceeded 90%of that of the single-pass deposition *** is proved that although there are uneven grooves on the surface of the over-lapping area during multi-layer and multi-pass deposition,they can be filled by the flow of materials during the deposition of the next lay-er,thus ensuring the dense microstructure and excellent mechanical properties of the overlapping *** multi-layer multi-pass FRAM deposition overcomes the limitation of deposition width and lays the foundation for the future deposition of large-scale high-performance components.

关键词： aluminum alloy additive manufacturing solid-state friction stir welding multi-layer multi-pass

Research status and prospects of the fractal analysis of metal material surfaces and interfaces

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe Cui beijing Advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China beijing Laboratory of Metallic materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

The Mechanism of Heating Rate on the Secondary Recrystallization Evolution in Grain Oriented Silicon Steel

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Journal of Wuhan University of technology(materials Science) 2025年第1期 275-282页

作者：高倩 LI Jun WANG Xianhui CAO Laifu GONG Jian LI Bo Central Iron and Steel Research Institute Group Shougang Zhixin Electromagnetic material R&D (beijing) co. Ltd. beijing Shougang co. Ltd.

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing, in which the evolution of magnetic properties, grain orientations and precipitates were studied. To illustrate the Zener factor, the diameter and number density of precipitates of interrupted testing samples were statistically calculated. The effect of precipitate ripening on the Goss texture and magnetic property was investigated. Data indicated that the trend of Zener factor was similar under different heating rates, first increasing and then decreasing, and that the precipitate maturing was greatly inhibited as the heating rate increased. Secondary recrystallization was developed at the temperature of 1 010 ℃ when a heating rate of 5 ℃/h was used, resulting in Goss, Brass and {110} oriented grains growing abnormally and a magnetic induction intensity of 1.90T. Furthermore, increasing the heating rate to 20 ℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss texture. However, when the heating rate was extremely fast, such as 40 ℃/h, poor secondary recrystallization was developed with many island grains, corresponding to a decrease in magnetic induction intensity to 1.87 T. At a suitable heating rate of 20 ℃/h, the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1 020 ℃ were found among the experimental variables in this study. The heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates, leading to the deviation and dispersion of Goss texture, thereby reducing the magnetic properties.

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Application of AlGaInP with Sb Incorporation in Lattice-Matched 5-Junction Tandem Solar Cells

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Chinese Physics Letters 2017年第2期34卷 126-130页

作者： Yang Zhang Qing Wang Xiao-Bin Zhang Na Peng Zhen-Qi Liu Bing-Zhen Chen Shan-Shan Huang Zhi-Yong Wang Institute of Laser Engineering Beijing University of TechnologyBeijing 100022 Redsolar New Energy technology co.ltd. Zhongshan 528437

It is well known that conventional CalnP/GMnAs/Ce three-junction （3J） solar cells are difficult to continue to ascend when the effieiencies reach 32% and 42% under AMO and AM1.5D concentrated, respectively. In AlCaInP/AiGMnAs/CalnAs/CalnNAs/Ce five-junction （5,/） solar cells, the performance of the AlGaInP, Al- CalnAs and CalnNAs sub cell is the key factor for conversion efficiency of the 5J solar cell. We investigate the AlCaInP/AlCaInAs/Ge 3J solar cell. By incorporating surfactant trimthylantimony into the AlGaInP material, the crystal quality of AICalnP is improved and the spectrum absorption range of AICalnAs is extended. The current density of each sub cell exceeds ll.3mA/cm2 as is desired. Then we apply this 3J structure to grow the lattice-matched 5J solar ceil and obtain the short circuit current of 134.96 mA, open circuit voltage of 4399.6 m V, fill factor of 81.7% and conversion efficiency of 29.87%.

关键词： Application of AlGaInP with Sb Incorporation in Lattice-Matched 5-Junction Tandem Solar Cells Sb

The nature of irreversible phase transformation propagation in nickel-rich layered cathode for lithium-ion batteries

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Journal of Energy Chemistry 2021年第11期30卷 351-358,I0008页

作者： Feng Wu Na Liu Lai Chen Ning Li Jinyang Dong Yun Lu Guoqiang Tan Mingzhe Xu Duanyun Cao Yafei Liu Yanbin Chen Yuefeng Su School of materials Science and Engineering Beijing Institute of TechnologyBeijing Key Laboratory of Environmental Science and EngineeringNational Development Center of High Technology Green MaterialsBeijing 100081China beijing Institute of technology Chongqing Innovation Center Chongqing 401120China beijing Easpring material technology co.ltd. Beijing 102628China

Ni-rich layered cathode is regarded as one of the most promising candidates to achieve lithium-ion batteries (LIBs) with high energy density. However, due to the irreversible phase transformation (IPT) and its eventual propagation from surface to the bulk of the material, Ni-rich layered cathode typically suffers from severe capacity fading, structure failure, and thermal instability, which greatly hinders its mass adoption. Hence, achieving an in-depth understanding of the IPT propagation mechanism in Ni-rich layered cathode is crucial in addressing these issues. Herein, the triggering factor of IPT propagation in Ni-rich cathode is verified to be the initial surface disordered cation mixing domain covered by a thin rock-salt phase, instead of the rock-salt phase itself. According to the density functional theory (DFT) results, it is further illustrated that the metastable cation mixing domain possesses a lower Ni migration energy barrier, which facilitates the migration of Ni ions towards the Li slab, and thus driving the propagation of IPT from surface to the bulk of the material. This finding clarifies a prevailing debate regarding the surface impurity phases of Ni-rich cathode material and reveals the origin of IPT propagation, which implies the principle and its effectiveness of tuning the surface microstructure to address the structural and thermal instability issue of Ni-rich layered cathode materials.

关键词： Lithium-ion battery Nickel-rich layered cathode Phase transformation propagation Cation-mixing domain Rock-salt phase

Large reversible magnetocaloric effect induced by metamagnetic transition in antiferromagnetic HoNiGa compound

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Chinese Physics B 2016年第12期25卷 398-402页

作者：王一旭张虎吴美玲陶坤李亚伟颜天宝龙克文龙腾庞铮龙毅 School of materials Science and Engineering University of Science and Technology of Beijing Chuan Dong Magnetic Electronic co.ltd.

The magnetic properties and magnetocaloric effects （MCE） of HoNiGa compound are investigated systematically. The HoNiGa exhibits a weak antiferromagnetic （AFM） ground state below the Neel temperature TN of 10 K, and the AFM ordering could be converted into ferromagnetic （FM） ordering by external magnetic field. Moreover, the fie/d-induced FM phase exhibits a high saturation magnetic moment and a large change of magnetization around the transition temperature, which then result in a large MCE. A large -△SM of 22.0 J/kg K and a high RC value of 279 J/kg without magnetic hysteresis are obtained for a magnetic field change of 5 T, which are comparable to or even larger than those of some other magnetic refrigerant materials in the same temperature range. Besides, the μ0H2/3 dependence of ｜△SPKM｜ well follows the linear fitting according to the mean-field approximation, suggesting the nature of second-order FM-PM magnetic transition under high magnetic fields. The large reversible MCE induced by metamagnetic transition suggests that HoNiGa compound could be a promising material for magnetic refrigeration in low temperature range.

关键词： rare-earth compound magnetocaloric effect metamagnetic transition

One step sintering of homogenized bauxite raw material and kinetic study

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International Journal of Minerals,Metallurgy and materials 2016年第10期23卷 1231-1238页

作者： Chang-he Gao Peng Jiang Yong Li Jia-lin Sun Jun-jie Zhang Huan-ying Yang School of material Science and Engineering University of Science and Technology Beijing Gongyi Tongda Zhongyuan Refractory technology co. Ltd.

A one-step sintering process of bauxite raw material from direct mining was completed, and the kinetics of this process was analyzed thoroughly. The results show that the sintering kinetics of bauxite raw material exhibits the liquid-phase sintering behavior. A small portion of impurities existed in the raw material act as a liquid phase. After X-ray diffraction analyses, scanning electron microscopy observations, and kinetics calculations, sintering temperature and heating duration were determined as the two major factors contributing to the sintering process and densification of bauxite ore. An elevated heating temperature and longer duration favor the densification process. The major obstacle for the densification of bauxite material is attributed to the formation of the enclosed blowhole during liquid-phase sintering.

关键词： bauxite refractory materials liquid phase sintering sintering kinetic studies

Stimuli-responsive microcarriers and their application in tissue repair: A review of magnetic and electroactive microcarrier

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Bioactive materials 2024年第9期39卷 147-162页

作者： LiYang Zhang Mengjiao Ma Junfei Li Kun Qiao Yajie Xie Yudong Zheng School of material Science and Engineering University of Science and Technology BeijingBeijingChina beijing Wanjie Medical Device co. LtdBeijingChina beijing Gerecov technology company ltd. BeijingChina

Microcarrier applications have made great advances in tissue engineering in recent years, which can load cells,drugs, and bioactive factors. These microcarriers can be minimally injected into the defect to help reconstruct agood microenvironment for tissue repair. In order to achieve more ideal performance and face more complextissue damage, an increasing amount of effort has been focused on microcarriers that can actively respond toexternal stimuli. These microcarriers have the functions of directional movement, targeted enrichment, materialrelease control, and providing signals conducive to tissue repair. Given the high controllability and designabilityof magnetic and electroactive microcarriers, the research progress of these microcarriers is highlighted in thisreview. Their structure, function and applications, potential tissue repair mechanisms, and challenges are *** summary, through the design with clinical translation ability, meaningful and comprehensiveexperimental characterization, and in-depth study and application of tissue repair mechanisms, stimuliresponsivemicrocarriers have great potential in tissue repair.

关键词： Stimuli-responsiveness Magnetic microcarrier Electroactive microcarrier Tissue repair