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Plating current density distribution of lithium metal anodes in pouch cells

Journal of Energy Chemistry 2022年第6期31卷 70-75,I0003页

作者： Shi-Jie Yang Xin Shen Xin-Bing Cheng Feng-Ni Jiang Rui Zhang He Liu Lei Liu Hong Yuan School of Materials Science&Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 211189JiangsuChina School of Chemistry and Materials Science Nanjing University of Information Science&TechnologyNanjing 210044JiangsuChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

The uniformity of current density distribution upon electrodes is one of the most important factors determining the lithium dendrites growth and cycling performance of lithium metal batteries(LMBs). Herein,current density distributions of lithium metal anodes induced by various engineering factors, consisting of uneven cathode, electrolyte distribution, and different tab positions, and their effects on the electrochemical performance are investigated theoretically and experimentally in pouch cells. The deviation of current density in lithium metal anodes ranges from 2.47% to 196.18% due to the different levels of uneven cathode materials. However, the deviation is just 13.60% for different electrolyte thicknesses between cathodes and anodes, even a ten-layer separator in some positions. The maximum deviation for variational tab positions is only 0.17%. The nonuniformity in current density distribution results in severe dendrite growth issues and poor electrochemical performance of LMBs. This work not only confirms the direct correlation between the uneven current density distribution and lithium deposition behaviors, but also points out the decisive effects of cathode surface roughness on current distribution of anodes, to which more attentions should be paid in practical applications of LMBs.

关键词： Pouch cell Lithium metal anode Dendrite Current density distribution Safety

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Nonvolatile bistable planar Hall effects in a natural two-dimensional metal–antiferromagnet heterostructure

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Physical Review B 2025年第15期111卷 155437-155437页

作者： Minjie Zhang Xinxi Liu Yuqiang Huang Qifeng Hu Jiayi Lu Hui Xing Dawei Shen Bin Lu Yunhao Lu Kenji Watanabe Takashi Taniguchi Guang-Han Cao Yi Zheng School of Physics and State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou 310027 China Key Laboratory of Artificial Structures and Quantum Control and Shanghai Center for Complex Physics School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Antiferromagnetic materials with van der Waals (vdW) layered structures hold great promises for developing the next generation of electronic and optoelectronic devices, providing unique combinations of terahertz spin dynamics, ultrastability against magnetic fields disturbance, and low power consumption. Here, we demonstrate unconventional nonvolatile bistable planar Hall effect (PHE) in few-layer GdTe3, a natural vdW heterostructure consisting of metallic Te layers and antiferromagnetic (AFM) GdTe bilayers. By fully unfolding the magnetic phase diagram of few-layer GdTe3 utilizing temperature- and angle-dependent magnetotransport measurements, we identify that the nonvolatile switching of bistable PHE states is rooted in the fourfold Néel vector flipping between two perpendicular in-plane magnetocrystalline anisotropy axes, each flipping reverses the signs of the PHE state. The efficient magnetic field (H) write-in and zero-field read out of the PHE memory pave the way for 2D AFM-based spintronics such as nonvolatile information storage and logic operations.

关键词： Antiferromagnetic materials

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Nature of CoCrFeMnNi/Fe and CoCrFeMnNi/Al Solid/Solid interface

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1483-1491页

作者： Zhongtao Li Weidong Zhang Zhenggang Wu College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

To shed light into the application potential of high-entropy alloys as"interlayer"materials for Al-steel solid-state joining,we investigated the nature of the CoCrFeMnNi/Fe and CoCrFeMnNi/Al solid/solid interfaces,focusing on the bonding behavior and phase *** metallurgical bonding without the formation of hard and brittle IMC can be achieved for CoCrFeMnNi/Fe solid/solid *** contrast to the formation of Al5 Fe2 phase at the Fe/Al interface,Al13Fe4-type IMC,in which the Fe site is co-occupied equally by Co,Cr,Fe,Mn and Ni,dominates the CoCrFeMnNi/Al *** the formation of IMC at the CoCrFeMnNi/Al interface is not avoidable,the thickness and hardness of the Al13(CoCrFeMnNi)4 phase formed at the CoCrFeMnNi/Al interface are significantly lower than the Al5 Fe2 phase formed at the Fe/Al *** activation energies for the interdiffusion of Fe/Al and CoCrFeMnNi/Al static diffusion couple are 341.6 kJ/mol and 329.5 kJ/mol,*** this similarity,under identical static annealing condition,the interdiffusion coe fficient of the CoCrFeMnNi/Al diffusion couple is significantly lower than that of the Fe/Al diffusion *** is thus mainly a result of the reduced atomic mobility/diffusivity caused by the compositional complexity in CoCrFeMnNi high-entropy alloy.

关键词： High-entropy alloy Microstructure Metallurgical bonding interface

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Microwave-accelerated direct regeneration of LiCoO_(2)cathodes for Li-ion batteries

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science China Chemistry 2024年第7期67卷 2181-2189页

作者： Xueshan Hu Yun-Chao Yin Chao Li Lihui Zhou Lin Yang Yitian Feng Daxian Zuo Chenhui Ning Das Soham Sheng Dai Longbin Qiu Lin Zeng Haw Jiunn Woo Jiayu Wan Future Battery Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Centre for Ionics University of Malaya Department of PhysicsFaculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Department of Natural and Applied Sciences Duke Kunshan UniversityKunshan 215316China

Recycling spent lithium-ion batteries is integral to today's low-carbon environmental protection *** concept of direct regeneration,acknowledged for its environmental sustainability,economic viability,and consistent performance of recycled materials,is gaining *** study presents an efficient and nondestructive approach by utilizing an ultrafast microwave technology to directly regenerate spent lithium cobaltate(LCO)cathode *** contrast to conventional furnacebased processes,this method significantly reduces the regeneration *** subjecting the spent LCO mixed with lithium sources to three microwave heating cycles(at approximately 1,350 K),LCO regeneration is achieved,yielding a specific capacity of 140.8 mAh g^(-1)(0.2 C)with a robust cycle *** further environmental and economic benefits,the ultrafast microwave technology holds scientific promise for directly regenerating cathode materials,while establishing competitiveness for industrial applications.

关键词： battery recycling spent lithium cobaltate microwave directly regeneration cathode materials

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Synergistic engineering of phosphaphenanthrene and ionic liquids for unlocking flame retardant multifunctional epoxy resin with high performances

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Polymer Degradation and Stability 2025年 239卷

作者： Wang, Hao Wang, Yadong Gao, Jingjing Zhu, Zongmin Xiao, Fei College of Materials Science and Engineering Hubei Key Laboratory for New Textile Materials and Applications Wuhan Textile University Wuhan430200 China State Key Laboratory of Advanced Polymeric Materials College of Polymer Science and Engineering Sichuan University Chengdu610064 China School of Safety Science and Emergency Management Wuhan University of Technology Wuhan430070 China

Herein, we presented a multifunctional epoxy resin (EP) composite prepared by the synergistic combination of DOPO and ionic liquids (ILs). The optimized EP-DOPO/ILs system demonstrated exceptional flame retardancy, with only 3 wt% of flame retardant (DOPO/ILs) added to achieve UL-94 V-0 grade for EP and a limiting oxygen index (LOI) of 33.4 %. Cone calorimeter test revealed 32.2 % and 26.7 % reductions in peak of heat release rate (pHRR) and total smoke production (TSP), respectively, compared to neat EP. Notably, the designed rigid-flexible epoxy network simultaneously enhanced tensile strength to 75.7 MPa (+15.7 %) and impact strength to 24.8 kJ m-2 (+136.3 %), outperforming conventional EP thermosets. Furthermore, the EP composites retained 90 % visible light transmittance while exhibiting ultraviolet (UV) shielding efficiency and intrinsic fluorescence. This multi-component collaborative system provides an important experimental foundation for developing high-performance multifunctional polymeric materials. © 2025 Elsevier Ltd

关键词： Fire protection

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Intralayer Phonons in Multilayer Graphene Moiré Superlattices

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Research 2022年第3期2022卷 385-395页

作者： Miao-Ling Lin Min Feng Jiang-Bin Wu Fei-Rong Ran Tao Chen Wei-Xia Luo Heng Wu Wen-Peng Han Xin Zhang Xue-Lu Liu Yang Xu Hai Li Yu-Fang Wang Ping-Heng Tan State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering&CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China School of Physics Nankai UniversityTianjin 300071China Key Laboratory of Flexible Electronics and Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech University30 South Puzhu RoadNanjing 211816China School of Micro-nanoelectronics State Key Laboratory of Silicon MaterialsHangzhou Global Scientific and Technological Innovation CenterZJU-UIUC Joint InstituteZhejiang UniversityHangzhou 310027China

Moirépattern in twisted multilayers(tMLs)induces many emergent phenomena by subtle variation of atomic registry to modulate quasiparticles and their interactions,such as superconductivity,moiréexcitons,and moiré*** periodic superlattice potential introduced by moirépattern also underlies patterned interlayer coupling at the interface of *** this arising patterned interfacial coupling is much weaker than in-plane atomic interactions,it is crucial in moirésystems,as captured by the renormalized interlayer phonons in twisted bilayer transitional metal ***,we determine the quantitative relationship between the lattice dynamics of intralayer out-of-plane optical(ZO)phonons and patterned interfacial coupling in multilayer graphene moirésuperlattices(MLG-MS)by the proposed perturbation model,which is previously challenging for MLGs due to their out-of-phase displacements of adjacent atoms in one atomic *** unveil that patterned interfacial coupling introduces profound modulations on Davydov components of nonfolded ZO phonon that are localized within the AB-stacked constituents,while the coupling results in layer-extended vibrations with symmetry of moirépattern for moiréZO *** work brings further degrees of freedom to engineer moiréphysics according to the modulations imprinted on the phonon frequency and wavefunction.

关键词： coupling twisted layer

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Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang Yuefeng Yan Zhen Wang Guansheng Ma Dechang Jia Xiaoxiao Huang Yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching

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Surface-modified MXene/TLCP nanocomposites with enhanced electrical and thermal conductivity via in situ grafting polymerization

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Polymer 2025年 333卷

作者： Dong, Shihang Huang, Shuohan Liang, Yuan Chen, Lingzhe Wang, Ying Chen, Yuhan Ma, Ke Ju, Xueqin Xiang, Guanglei Wan, Hai Jin, Wenbin Wang, Yanping He, Yong Wei, Peng Xia, Yumin State Key Laboratory of Advanced Fiber Materials Key Laboratory of High Performance Fibers & Products Engineering Research Center of Technical Textiles Ministry of Education College of Materials Science and Engineering College of Physics Innovation Center for Textile Science and Technology in Donghua University Shanghai China College of Textiles Henan Key Laboratory of Functional Textile Materials Zhongyuan University of Technology Zhengzhou China

MXenes, an emerging class of two-dimensional transition metal carbides and nitrides, have garnered significant attention due to their exceptional electrical, thermal, and mechanical properties. However, achieving uniform dispersion of hydrophilic MXene nanosheets within a hydrophobic thermotropic liquid crystal polyester (TLCP) matrix presents a formidable challenge that limits their practical applications. In this study, we address this challenge through a direct surface modification approach to enhance the interfacial interaction between MXene and TLCP. The effects of modified MXene on TLCP performance were investigated through comprehensive material characterization. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses reveal that 6-aminohexanoic acid effectively mediates the interfacial interaction between MXene and TLCP molecules, preventing the aggregation of MXene nanosheets and facilitating their uniform dispersion throughout the TLCP matrix. The incorporation of modified MXene (Am-MXene) significantly enhances the thermal stability of the resulting nanocomposites, with the Am-50 %MXene/TLCP demonstrating a 27 C increase in the 5 % weight loss temperature compared to pristine TLCP. The nanocomposite achieves a notable electrical conductivity of 5.99 S/m while preserving the TLCP's intrinsic microstructure. Moreover, MXene incorporation enhances the orderliness and alignment of liquid crystal textures. The nanocomposite exhibits substantial improvements in thermal diffusivity (67 %), thermal conductivity (25 %), dielectric constant (318 %), and photothermal conversion temperature (84 %). These findings advance our understanding of designing multifunctional composite materials with enhanced performance characteristics. © 2025 Elsevier Ltd

关键词： Nanocomposites

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Recent progress of fluorescent liquid crystals

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Journal of Molecular Liquids 2025年 432卷

作者： Wang, Naiji Bi, Wenjie Liu, Yingliang Xu, Shengang Wang, Kunlun Cao, Shaokui Henan Key Laboratory of Advanced Nylon Materials and Application School of Materials Science and Engineering Zhengzhou University Henan Province Zhengzhou China Huanghe University of Science and Technology Henan Province Zhengzhou China

Liquid crystals (LCs) are smart soft materials and have attracted great attention for over six decades. In recent years, significant progress has been made in the research of fluorescent liquid crystals (FLCs) in terms of molecular design, performance optimization, and expansion of application fields, which has been regarded as promising candidates not only for organic luminescent materials but also in areas such as sensors, solar cells, and organic optoelectronic devices. In particular, the review focused on two main classes of FLCs, rod-shaped and discotic-shaped LCs. The latest research advances on molecular design and synthesis, mesogenic properties, photophysical properties as well as applications were presented respectively. Further, the challenges and prospectives were discussed, hopefully offering reasonable and useful information to assist future development of this multidisciplinary area. © 2025 Elsevier B.V.

关键词： Photodetectors

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In Situ Coordinated Ultrathin Mof-Polymer Electrolyte Membrane with Vertically Aligned Transfer Channels for Solid Lithium Metal Batteries

SSRN

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SSRN 2024年

作者： Qi, Xinhong Zhang, Shichen Li, Yihang Li, Xiangcun Chu, Fangyi Wang, Xuri Yu, Miao Jiang, Xiaobin Ruan, Xuehua Tu, Jiangping He, Gaohong State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province School of Materials Science and Engineering Zhejiang University Hangzhou310027 China

Metal organic framework (MOF)-polymer composite solid electrolyte membrane with novel microstructure is expected to show attractive prospect for solid state lithium metal batteries. But the reported MOF were usually regarded as an entirety in composite solid electrolyte resulting in tradeoff between ionic conductivity and lithium dendrite inhibition ability. Herein, MOF-polymer composite membrane with vertically aligned channels and ultrathin MOF layer is proposed to decrease lithium ion transportation resistance obtained by simple phase inversion and in situ coordinated growth methods. The vertically aligned highways can decrease tortuous pathways and intensify ion conduction. The embedded ultrathin MOF layer on membrane surface leads to homogeneous plating/stripping of lithium. This novel structured MOF-polymer composite solid electrolyte exhibits improved ionic conductivity of 0.55 mS cm−1 at 22 °C and ion transference number of 0.87. Furthermore, the Li/Li symmetrical cell shows stable lithium plating/stripping performance for 1100 h at 0.1 mA cm−2 and 0.1 mAh cm−2. LiFePO4/MOF-polymer/Li coin battery demonstrates good rate capability and cycling performance with capacity retention of 82% after 100 cycles at 0.2 C and the pouch cell can light up the "DLUT" blue light lamp under folding and cutting states. This work encourages a new avenue to develop composite solid electrolytes with ion transportation highways and uniform distribution plane for solid lithium metal batteries. © 2024, The Authors. All rights reserved.

关键词： Ionic conductivity

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