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Pressure-controlled synergy between dehydrogenation and densification in TiH₂ sintering

Journal of the European Ceramic Society 2025年第14期45卷

作者： Hu, Tianxiao Lin, Mengting Zou, Ji Wang, Weimin Ji, Wei Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Titanium hydride (TiH2) ceramics have become key high-performance hydrogen storage materials. However, the sintering of TiH2 faces significant challenges due to the low temperature of dehydrogenation reaction (300–80... 详细信息

Titanium hydride (TiH₂) ceramics have become key high-performance hydrogen storage materials. However, the sintering of TiH₂ faces significant challenges due to the low temperature of dehydrogenation reaction (300–800 °C). In this study, high-pressure spark plasma sintering (HPSPS) technique was employed to successfully realize low-temperature high-density preparation by suppressing dehydrogenation and regulating densification kinetics under a high pressure (200 MPa). Under the optimized conditions (750 °C, 200 MPa, and 10 min), a fully dense single face-centered cubic (FCC) δ-Ti(H) phase bulk material was fabricated. The initial dehydrogenation temperature of samples fabricated by high-pressure spark plasma sintering (HPSPS) was higher than the dehydrogenation temperature of powder. Mechanistic analyses showed that high pressure inhibited hydrogen escape by compressing pores while promoting particle plastic flow and interfacial bonding. Increasing holding time from 5 to 10 min enhanced diffusion-dominated densification but exacerbated dehydrogenation-induced porosity under low-pressure conditions. The study shows that high pressure compaction can alleviate the contradiction between traditional high temperature densification and low temperature decomposition of TiH₂, and offers a new strategy for the efficient densification of materials for low temperature decomposition. © 2025 Elsevier Ltd

关键词： Dehydrogenation Phase transition Spark plasma sintering Titanium hydride

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Direct Regeneration of Degraded High-Nickel Layered Cathode with a Grain-Growth Inhibitor by Epitaxial Boundaries

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advanced Functional materials 2025年

作者： Chen, Xingye Su, Jun Liu, Weizheng Wang, Juan Liu, Yuxin Li, Dongqi Zhang, Yixin Zeng, Weihao Zhang, Shaojie Li, Zhongpeng Wang, Xuanpeng Mu, Shichun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology Wuhan University of Science and Technology Wuhan430081 China Co. Ltd Zhengzhou45000 China

The direct regeneration of degraded cathode materials for lithium-ion batteries holds significant promise for closed-loop recycling. However, fully recovering the structure and performance of degraded LiNixCoyMnzO2 (NCM) cathodes remains a significant challenge, limiting its practical applications. Here, this study uncovers that the regrowth of primary grains is a critical factor leading to microstructural rearrangement and grain boundary reformation, which compromises the performance of regenerated polycrystalline NCM materials. Therefore, to inhibit excessive grain growth, an epitaxial Li3Ni2NbO6 grain boundary is successfully incorporated into the regenerated NCM (Nb-R-NCM) through a niobium (Nb)-assisted eutectic method, which preserves structural integrity and minimizes cationic disorder. Additionally, the Li3Ni2NbO6 epitaxial layer relieves internal strains of NCM, thereby mitigating the lattice expansion and contraction during charging and discharging processes. All these are conducive to the high-voltage stability of Nb-R-NCM. As expected, it demonstrates a high capacity of 183.13 mAh g⁻¹ at 0.1 C comparable to commercial NCM materials, and even maintains stable cycling with 83.4% retention over 300 cycles at 1C in the voltage range of 3.0–4.5 V. This work presents a constructive approach for the direct regeneration of ternary cathode materials, paving the way for enhanced practicality and performance in sustainable energy applications. © 2025 Wiley-VCH GmbH.

关键词： Lithium-ion batteries

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Large-scale manufacturing sulfide superionic conductor for advancing all-solid-state batteries

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Matter 2025年

作者： Wang, Shuo Lou, Chenjie Wu, Xinbin Lin, Jing Gautam, Ajay Li, Shenghao Huang, Jielei Cheng, Zhu Zhang, Shengnan Zhang, Xin Strauss, Florian Brezesinski, Torsten Luo, Guoqiang Tang, Mingxue Shen, Yang Lin, Yuanhua Nan, Ce-Wen Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Kaiserstr. 12 Karlsruhe76131 Germany Department of Radiation Science and Technology Delft University of Technology JB Delft2629 Netherlands

Lithium argyrodites with high ionic conductivities are favorable solid electrolytes (SEs) for all-solid-state batteries (ASSBs). However, their low preparation efficiency and poor cycling performance hinder their large-scale applications. In this work, we demonstrate successful large-scale production (over 1 kg per batch for the first time) of Li5.5PS4.5Cl0.75Br0.75 (LPSCB) by fast dry mixing followed by annealing, which presents high room temperature ionic conductivities of 13 mS cm−1 for cold-pressed and 25 mS cm−1 for sintered pellets. Combining neutron powder diffraction and 6Li → 7Li tracer-exchange nuclear magnetic resonance (NMR) spectroscopy measurements, we show that intercage jumps frequently occur through the 48h-16e-48h pathway in LPSCB, promoting the overall lithium conduction. The assembled ASSBs using LPSCB and a LiNi0.83Co0.11Mn0.06O2 electrode can be cycled for over 2,500 cycles at a 0.5 C rate and 1,800 cycles at a 2 C rate without any capacity degradation. Our results will accelerate the commercialization of sulfide SE for ASSBs. © 2025 Elsevier Inc.

关键词： Neutron powder diffraction

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Effects of AlN addition on the reactive sintering behavior and comprehensive properties of h-BN/ZrO2 composites prepared by spark plasma sintering

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materials and Design 2025年 254卷

作者： Qu, Yuannong Zou, Ji Wang, Weimin Ji, Wei Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The h-BN/ZrO2 composites for preparing ceramic side sealing plate were obtained with spark plasma sintering (SPS) at 1700 °C for 10 min in the study. By varying AlN content from 0 to 20 wt%, we systematically explored its influence on sintering behavior, microstructure evolution, mechanical performance, and corrosion mechanism at1600 °C. Results show that the rapid heating and uniaxial pressure during SPS and the in-situ reactions between AlN and ZrO2 promoted the densification of composites. The main reaction products were ZrN, which acted as an effective oxygen scavenger, consuming dissolved oxygen ([O]) and converting into ZrO2. These newly formed ZrO2 particles filled residual porosity within the matrix and nucleated around pre-existing ZrO2 grains, progressively coalescing into continuous Zr-rich barrier *** preventing molten steel from further penetrating into the matrix. The corrosion depth of the composite with 5 wt% AlN content in molten steel at 1600 °C after 2 h was only 69 μm. Meanwhile, it showed a thermal conductivity of 25 W m−1 K−1 and a coefficient of thermal expansion of 3.7 × 10-6 K−1, demonstrating excellent thermal shock resistance. The composites are expected to be used to manufacture side sealing plates for the novel continuous casting of thin strip. © 2025 The Authors

关键词： Thermooxidation

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Harnessing the enol/keto-form emission of ESIPT: mechanochromism, multi-channel imaging, and detection of a chemical warfare agent mimic

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Science China materials 2025年第2期68卷 448-454页

作者： Kangmin Wang Min Zhang Danni Yang Liqiu Wan Shouxin Zhang Liang Yan Ke Yang Bijin Li Chongqing Key Laboratory of Natural Product Synthesis and Drug Research School of Pharmaceutical Sciences&Department of Medical LaboratoryShapingba Hospital Affiliated to Chongqing UniversityChongqing UniversityChongqing 401331China State Key Laboratory of NBC Protection for Civilian Beijing 100191China Jiangsu Key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China

Reported herein is the first time mechanochromicmaterials based on sole enol-form emission of 2-(2’-hydroxyphenyl)azoles containing one triphenylamine (TPA).Three different single crystals were obtained and representpristine, intermediate, and ground states, respectively. The 2-(2’-hydroxyphenyl)azoles containing two TPA exhibit balanced dual-emission and could be used in multi-channelimaging, and selectivity accumulated in mitochondria of livingcells. In addition, we developed the first example of excitedstate intramolecular proton transfer (ESIPT) materials withsole enol-form emission and balanced dual-emission to detectchemical warfare agents (CWAs) mimic diethyl chlorophosphate (DCP) with good selectivity, highly sensitive, and fastresponsive.

关键词： fluorescent materials enol-form emission keto-form emission ESIPT chemical warfare agents

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Effects of depth of discharge on the electrochemical performance of LiFePO4-graphite pouch cells

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Solid state Ionics 2025年 427卷

作者： Qiao, Xin Mu, Yahao Peng, Jian Pei, Bo Wang, Shuo Wuhan Institute of Marine Electric Propulsion Wuhan430064 China Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China

Lithium iron phosphate-graphite (LFP-C) batteries are widely used in energy storage and electric vehicles due to their high safety and good cycling stability. However, there is still a lack of in-depth research to investigate the impact of depth of discharge (DOD) on LFP-C pouch cells. In this work, we systematically investigate the influence of DOD (2.5 V and 1.5 V) on the cycling performance of LFP-C pouch cells, and the evolution of the cathode–electrolyte interphase (CEI) and solid electrolyte interphase (SEI) layers. In comparison to a DOD of 2.5 V, the cell with a DOD of 1.5 V exhibits a rapid capacity degradation after 50 cycles. Combined with comprehensive characterizations, the mechanism of battery decay has been revealed. A deeper discharge to 1.5 V results in an increase in the disorder of graphite. Additionally, the organic components in the SEI layer decreases, while the Li2CO3, LiF, and Li3PO4 inorganic products enrich due to the continued decomposition of electrolyte. Meanwhile, the pouch cells generate a considerable quantity of H2 and minor CH4 gases. This study will pave the way to understand the effects of overdischarge on the electrochemical performance of commercial pouch cells and the evolution mechanism of CEI/SEI layers. © 2025 Elsevier B.V.

关键词： Battery Pack

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Simultaneous Enhancement of Electron and Phonon Transport Properties via Magnetism Phase Transition in FexCo2-xTiGe Heusler Alloy

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Small 2025年第21期21卷 e2500154页

作者： Li, Yongqiang Wang, Hanwen Cui, Wenjun Lin, Weixiao Sun, Yue Zhao, Wen Sang, Xiahan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Shenzhen Institute Shenzhen518000 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China Shandong Qingdao266580 China

Magnetism offers an additional degree of freedom to control the electron and phonon transport properties of thermoelectric materials through various thermoelectromagnetic effects. To better understand the interplay among spin, carriers, and phonons, it is important to design material systems with intrinsic magnetic and thermoelectric properties. Here, it is demonstrated that Fe doping of the full Heusler alloy Co2TiGe simultaneously enhances its magnetic and thermoelectric performance. Aberration-corrected scanning transmission electron microscopy (STEM) reveals that Fe atoms preferentially substitute for Co atoms within the Co2TiGe lattice, leading to increased saturation magnetization and a higher Curie temperature. This Fe substitution reduces the carrier concentration, enhancing the Seebeck coefficient and power factor, while also increasing magnetic scattering due to spin fluctuations during the ferromagnetic-paramagnetic phase transition. Furthermore, the thermal conductivity is significantly reduced by enhanced phonon scattering from secondary phases and point defects. Consequently, a maximum ZT value of 0.066 is achieved at 600 K for Fe0.4Co1.6TiGe, representing a 663% increase compared to the undoped Co2TiGe. © 2025 Wiley-VCH GmbH.

关键词： Saturation magnetization

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Ablation behavior and mechanism of MoSi2/mica/HSM modified CF/BPR composites during prolonged ablation of oxyacetylene flame

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Ceramics International 2025年

作者： Zhang, Shiquan Zhang, Jian Hu, Sheng Zhang, Ruizhi Li, Junguo Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Xiangyang441000 China School of Chemical and Environment Engineering Hubei Minzu University Enshi445000 China

Ablative thermal protection materials are widely used in entry and re-entry vehicles which benefit from their strong adaptability. However, long-term ablation has been a limitation due to the consumption of the matrix of the ablative materials. In this work, the microstructure evolution and ablation properties of the MoSi2/mica-modified CF/BPR composites with and without hollow silicate glass microspheres (HSMs) under protracted ablation have been investigated. The mass ablation rates decreased while the linear ablation rates increased when the ablation times were prolonged. The composites with 30 vol.% HSMs have good insulation properties, shown by a lower backside temperature of 240.9 °C after 100 s of ablation. The decrease in thermal conductivity limited heat transfer in both the axial and horizontal directions. This led to heat concentration and severe ablation at the central surface. The three-dimensional porous and the ladder structure formed in the transfer region, and the features gradually disappeared while extending the ablation times because of the flame erosion and formed liquid phases. The heat diffusion and concentration within the matrix established a gradient temperature field, which determined the ablation behavior and mechanism, providing valuable insights for the development of advanced ablative thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicates

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Chemical homogeneity enables long-term stability of cobalt-free high-voltage spinel cathode materials

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Chemical Engineering Journal 2025年 515卷

作者： Zeng, Chunlin Chen, Guanjun Zhang, Qian Li, Yan Dai, Chengzhi Zhao, Ruotong Mu, Shichun Zeng, Weihao Yang, Jinlong Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Energy Electrocatalytic Materials College of Materials Science and Engineering Shenzhen University Shenzhen518060 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Cobalt-free LiNi0.5Mn1.5O4 (LNMO) is a highly competitive spinel cathode material due to the Ni2+/4+ redox couple, which alleviates Jahn-Teller distortion and offers a high redox potential near 5 V. However, its limited cycling life remains a major obstacle to large-scale application, primarily due to severe interfacial instability. Here, we identify chemical inhomogeneity as a limiting factor contributing to this instability, which leads to increased oxygen vacancies and rock-salt phase formation on the particle surface, resulting in poor cycling stability. In contrast, we demonstrate that chemically homogeneous LNMO (CH-LNMO), synthesized via a polyvinylpyrrolidone (PVP)-assisted solid-state method, exhibits a uniform Ni/Mn distribution and improved interfacial stability, which achieves excellent cycling performance, with a capacity retention of 90.32 % after 1000 cycles at 2C. We further reveal that chemical homogeneity enhances Ni/Mn ordering in the structure and decreases the Jahn-Teller effect of Mn3+, thereby mitigating interfacial reactions and transition metal ion dissolution. This work underscores the critical role of chemical homogeneity in large-scale synthesis and provides a viable approach for improving the long-term cycling stability of cathode materials. © 2025

关键词： Jahn-Teller effect

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Dioxole-contained perfluorosulfonated ionomers with different equivalent weights as catalyst binder and proton conductor for proton exchange membrane fuel cells

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Fuel 2025年 399卷

作者： Wang, Cairong Tong, Yao Wang, Yadong Tang, Haolin Zhang, Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Nr. 122 Luoshi Rd. Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China Hubei Key Laboratory of Fuel Cell Wuhan University of Technology Hubei Wuhan430070 China

Improving the oxygen transport ability without sacrificing proton conductivity in cathode catalyst layer is an essential way to increase the performance, thereby reducing platinum usage of proton exchange membrane fuel cells (PEMFCs). Herein, we report the influence of equivalent weight of dioxole-contained highly oxygen permeable perfluorosulfonic acid ionomers as catalyst binder and proton conductor in cathode catalyst layer on the performance of PEMFC. The results reveal that the increase in the fraction of dioxole segments leads to the enhanced oxygen permeation but the decreased proton conductivity in catalyst layer. With optimization of equivalent weight of the synthesized ionomers, the accordingly assembled cell with platinum loading of 0.125 mg cm−2 for both anode and cathode exhibits an improved concentration polarization, leading to an increased peak power density by 166 mW cm−2 at current density of 2900 mA cm−2 compared to Nafion ionomer-based PEMFC at 2800 mA cm−2 using hydrogen and air as reactant gases. © 2025 Elsevier Ltd

关键词： Oxygen permeable membranes

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