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A Tri-Salt Composite Electrolyte with Temperature Switch Function for Intelligently Temperature-Controlled Lithium Batteries

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ENERGY & ENVIRONMENTAL mat.RIALS 2024年第6期7卷 84-93页

作者： Fu, Ende Wang, Huimin Zhang, Yating Xiao, Zhenxue Zheng. Xiu Hao, Shuai Gao, Xueping Nankai Univ Inst New Energy Mat Chem Sch Mat Sci & Engn Tianjin 300350 Peoples R China

The intense research of lithium-ion batteries has been motivated by their successful applications in mobile devices and electronic vehicles. The emerging of intelligent control in kinds of devices brings new requirements for battery systems. The high-energy lithium batteries are expected to respond or react under different environmental conditions. In this work, a tri-salt composite electrolyte is designed with a temperature switch function for intelligently temperature-controlled lithium batteries. Specifically, the halide Li3YBr6 together with LiTFSI and LiNO3 works as active fillers in a low-melting-point polymer mat.ix (polyethyleneglycol dimethyl ether (PEGDME) and polyethylene oxide (PEO)), which is further filled into the pre-lithiated alumina fiber skeleton. Above 60 degrees C, the composite electrolyte exists in the liquid state and fully contacts with the working electrodes on the liquid-solid interface, effectively minimizing the interfacial resistance and leading to high disch.rge capacity in the cell. The electrolyte is changed into a solid state below 30 degrees C so that the ionic conductivity is significantly reduced and the interface resistance is increased dramat.cally on the solid-solid interface. Therefore, by simply adjusting the temperature, the cell can be turned "ON" or "OFF" intentionally. This novel function of the composite electrolyte has enlightening significance in developing intelligently temperature-controlled lithium batteries. A tri-salt composite electrolyte is developed by adding Li3YBr6, LiTFSI, and LiNO3 into PEGDME/PEO. It reversibly transforms between solid and liquid through adjusting the temperature, with lithium-ion conductivity and interfacial contact dramat.cally changed. Correspondingly, the cells are blocked or conductive as turning "off" and "on" reversibly and flexibly. This switch function shows great potential for developing intelligently temperature-controlled lithium batteries. image

关键词： composite electrolyte halide electrolyte low melting point solid-state battery temperature switch function SOLID POLYMER ELECTROLYTES IONIC-CONDUCTIVITY RECENT PROGRESS COMPATIBILITY INTERFACE NANOWIRES CATHODE SIO2

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Thermocapillary motion of deformable fluid particles in tubes

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Science China mat.emat.cs 2002年第10期45卷 1335-1350页

作者：陈晋南 sch. of chem. eng. and mat. Science Beijing Institute of Technology Beijing 100081 China

The boundary integral technique is used to study the effect of deformat.on on the steady,creeping, thermocapillary migration of a fluid particle under conditions of axisymmetry, negligiblethermal convection and an insulated tube wall. The spherical radius of the fluid particle (i.e. theradius as if the particle were a sphere, a '= (3Vp'/4π)1/3, Vp'is the particle volume) and that ofthe tube are denoted, respectively, by a'and b'. For small capillary number Ca = 0.05, only for alarge fluid particle (a'/b'= 0.8) is deformat.on significant. For a'/b'= 0.8, hydrodynamic stressessqueeze the particle, reduce the interaction of the particle with the wall and thereby increase theterminal velocity. For small particles a'/b'＜ 0.8 and Ca = 0.05 the fluid particles translate asspheres, due to the fact that the fluid particleis too far away from the wall to be subject to distend-ing hydrodynamic stresses. The deformable particle moves faster than a spherical one in thethermocapillary migration. The increase in velocity with capillary number is larger for thermocapil-lary motion than for buoyancy.

关键词： two phase flow, fluid particle, deformable, thermocapillary migration.

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Stabilized Nickel-Rich-Layered Oxide Electrodes for High-Performance Lithium-Ion Batteries

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ENERGY & ENVIRONMENTAL mat.RIALS 2024年第6期7卷 60-73页

作者： Ahaliabadeh, Zahra Miikkulainen, Ville Mantymaki, Miia Colalongo, mat.ia Mousavihashemi, Seyedabolfazl Yao, Lide Jiang, Hua Lahtinen, Jouko Kankaanpaa, Timo Kallio, Tanja Aalto Univ Sch Chem Engn Dept Chem & Mat Sci CMAT Espoo 02150 Finland Univ Helsinki Dept Chem Helsinki 00014 Finland Aalto Univ Sch Sci Dept Appl Phys Espoo 02150 Finland Umicore Finland Oy Kokkola 67101 Finland

Next-generation Li-ion batteries are expected to exhibit superior energy and power density, along with extended cycle life. Ni-rich high-capacity layered nickel manganese cobalt oxide electrode mat.rials (NMC) hold promise in achieving these objectives, despite facing challeng.s such as capacity fade due to various degradation modes. Crack format.on within NMC-based cathode secondary particles, leading to parasitic reactions and the format.on of inactive crystal structures, is a critical degradation mechanism. Mechanical and chem.cal degradation further deteriorate capacity and lifetime. To mitigate these issues, an artificial cathode electrolyte interphase can be applied to the active mat.rial before battery cycling. While atomic layer deposition (ALD) has been extensively explored for active mat.rial coatings, molecular layer deposition (MLD) offers a complementary approach. When combined with ALD, MLD enables the deposition of flexible hybrid coatings that can accommodate electrode mat.rial volume changes during battery operation. This study focuses on depositing TiO2$$ {\mat.rm{TiO}}_2 $$-titanium terephthalate thin films on a LiNi0.8Mn0.1Co0.1O2$$ {\mat.rm{LiNi}}_{0.8}{\mat.rm{Mn}}_{0.1}{\mat.rm{Co}}_{0.1}{\mat.rm{O}}_2 $$ electrode via ALD-MLD. The electrochem.cal evaluation demonstrates favorable lithium-ion kinetics and reduced electrolyte decomposition. Overall, the films deposited through ALD-MLD exhibit promising features as flexible and protective coatings for high-energy lithium-ion battery electrodes, offering potential contributions to the enhancement of advanced battery technologies and supporting the growth of the EV and stationary battery industries. Ni-rich NMC811 electrodes in lithium-ion batteries face aging challeng.s with capacity loss and crack format.on. To counteract, TiO2$$ {\mat.rm{TiO}}_2 $$-titanium terephthalate films, via atomic/molecular layer deposition, enhance structural stability. The flexible organic component improves lithium d

关键词： degradation mechanisms electrolyte decomposition hybrid coatings lithium-ion battery lithium-ion kinetics molecular layer deposition NMC811 HIGH-ENERGY DENSITY CATHODE mat.RIALS DEPOSITION SURFACE

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An Excellent Gas Chromat.graphic Stationary Phase for Separation of Phenol and Cresol Isomers--Heptakis(2,6-di-O-pentyl-3-O-allyl)-β-Cyclodextrin

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Chinese chem.cal Letters 2000年第3期11卷 265-266页

作者： Yue Qin ZHANG, Xue Yan SHI, Ruo Nong FU (sch.ol of chem.cal eng.neering and mat.rials Science. Beijing Institute of Technology, Beijing 10008) sch. of chem. eng. and mat. Science Beijing Institute of Technology Beijing 100081 China

Heptakis(2.6-di-O-pentyl-3-O-ally)-β-cyclodextrin as an excellent gas chromat.graphic stationary phase separating phenol and cresol isomers is described.

关键词： Gas chromat.graphic stationary phase phenol and cresol isomers heptakis(2.6-di-Opentyl-3-O-allyl)-β-cyclodextrin.

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Hybrid HMX multi-level assembled under the constraint of 2D mat.rials with efficiently reduced sensitivity and optimized thermal stability

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DEFENCE TECHNOLOGY 2024年第9期39卷 123-132页

作者： Song, Xiaomin Huang, Longjin Peng. Rufang Huang, Qi Xu, Jinjiang Sun, Jie China Acad eng. Phys Inst Chem Mat Mianyang 621900 Peoples R China Southwest Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Environm Friendly Energy Mat Mianyang 621010 Peoples R China

The interfacial interaction between HMX molecules and coating mat.rials is the key to the safety performance of explosives and has received extensive attention. However, screening suitable coating agents to enhance the interfacial effect to obtain high-energy and low-sensitivity explosives has long been a major challeng.. In this work, HMX-PEI/rGO/g-C3N4 (HPrGC) composites were innovatively prepared by a multi-level coating strategy of two-dimensional graphite rGO and g-C3N4. The g-C3N4 used for desensitization has a rich pi-conjugated system and shows outstanding ability in reducing friction sensitivity. The hierarchical structure of HPrGC formed by electrostatic self-assembly and pi-pi stacking can effectively dissipate energy accumulation under heat and mechanical stimulation through structural evolution, thus exhibiting a prominent synergistic desensitization effect on HMX. The results show that rGO/g-C3N4 coating has no effect on the crystal structure and chem.cal structure of HMX. More importantly, the perfect combination of g-C3N4 and rGO endows HPrGC with enhanced thermal stability and ideal mechanical sensitivity (IS: 21 J, FS: 216 N). Obviously, the new fabrication of HPrGC enriches the variety of desensitizer mat.rials and helps to deepen the understanding of the interaction between explosives and coatings. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi CommunicationsCo. Ltd. This is an open access article under the CC BY-NC-ND license

关键词： HMX-PEI/rGO/g-C 3 N 4 Electrostatic self-assembly p stacking Synergistic desensitization GRAPHENE OXIDE CRYSTALS NANOCOMPOSITES COMPOSITES DENSITY IMPACT

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Preparation of a Novel Micro/nano Tubes via Electrospun Fiber as a Template

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Journal of mat.rials Science & Technology 2004年第5期20卷 613-616页

作者： Taiqi LIUsch.ol of mat.rials and chem.cal eng.neering, Beijing Institute of Petro-chem.cal Technology, Beijing 102617, China sch. of mat. and chem. eng. Beijing Inst. of Petrochem. Technol. Beijing 102617 China

Poly (para-xylylene) hollow fibers with inner diameters can be prepared via template fibers electrospun from solutions. The PPX is deposited from the vapor phase and the template fiber is selectively removed by heat treatment or solvent extraction. The PPX is partially crystalline and the crystal modification depending on the route is used to extract the template fiber. The thermal stability of the hollow fibers is only slightly reduced relative to the bulk mat.rial and the same holds for the UV-stability.

关键词： Electrospinning Fiber chem.cal vapor deposition Physical vapor deposition Crystal Conductivity

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The transition to turbulent fluidization in a gas-solid fluidized bed operating from ambient temperature to 1600 °C

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PARTICUOLOGY 2024年第10期93卷 111-124页

作者： Zhang, Qingjin Fu, Liangliang Xu, Guangwen Bai, Dingrong Shenyang Univ chem.Technol Key Lab Resources Chem & Mat Minist Educ Shenyang 110142 Peoples R China Shenyang Univ Technol Sch Mat Sci & Engn Shenyang 110142 Peoples R China Ordos Lab Ordos 017010 Peoples R China

Turbulent fluidized bed proves effective in industrial processes due to superior heat and mass transfer and chem.cal reaction performance. However, understanding the transition to turbulent fluidization remains limited, especially at temperatures exceeding 1000 degrees C, making it challeng.ng to develop hightemperature fluidized bed applications. This paper presents an experimental investigation on the turbulent fluidization onset velocity (Uc), measured in a 30 mm diameter bed using corundum particles with average diameters from 0.68 mm to 1.58 mm in temperatures from ambient to 1600 degrees C. Experimental results reveal that Uc increases with temperature up to 600 degrees C, stabilizes within the 600-1200 degrees C range, and then decreases above 1200 degrees C, demonstrating the varying relative significance of hydrodynamic and interparticle forces at different temperatures. To help design and operate high-temperature applications of turbulent fluidization, we developed Uc correlations based on experimental data from both literature sources and this study, covering temperatures of up to 1600 degrees C and particles of Groups A to D.

关键词： High-temperature fluidized beds Turbulent fluidization Transition velocity Pressure fluctuations Hydrodynamic forces Interparticle forces REGIME TRANSITION HYDRODYNAMICS PRESSURE VELOCITIES SIZE

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Superior Anodic Lithium Storage in Core-Shell Heterostructures Composed of Carbon Nanotubes and sch.ff-Base Covalent Organic Frameworks

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ENERGY & ENVIRONMENTAL mat.RIALS 2024年第6期7卷 150-157页

作者： Jiang, Nan Qi, Meng.ei Jiang, Yalong Fan, Yin Jin, Shiwei Yang, Yingkui South Cent Minzu Univ Sch Chem & Mat Sci Wuhan 430074 Peoples R China Wuhan Text Univ State Key Lab New Text Mat & Adv Proc Technol Wuhan 430200 Peoples R China

Covalent organic frameworks (COFs) after undergoing the superlithiation process promise high-capacity anodes while suffering from sluggish reaction kinetics and low electrochem.cal utilization of redox-active sites. Herein, integrating carbon nanotubes (CNTs) with imine-linked covalent organic frameworks (COFs) was rationally executed by in-situ sch.ff-base condensation between 1,1 '-biphenyl]-3,3 ',5,5 '-tetracarbaldehyde and 1,4-diaminobenzene in the presence of CNTs to produce core-shell heterostructured composites (CNT@COF). Accordingly, the redox-active shell of COF nanoparticles around one-dimensional conductive CNTs synergistically creates robust three-dimensional hybrid architectures with high specific surface area, thus promoting electron transport and affording abundant active functional groups accessible for electrochem.cal utilization throughout the whole electrode. Remarkably, upon the full activation with a superlithiation process, the as-fabricated CNT@COF anode achieves a specific capacity of 2324 mAh g-1, which is the highest specific capacity among organic electrode mat.rials reported so far. Meanwhile, the superior rate capability and excellent cycling stability are also obtained. The redox reaction mechanisms for the COF moiety were further revealed by Fourier-transform infrared spectroscopy in conjunction with X-ray photoelectron spectroscopy, involving the reversible redox reactions between lithium ions and C=N groups and gradual electrochem.cal activation of the unsaturated C=C bonds within COFs. Coupling conductive carbon nanotubes with redox-active imine-linked covalent organic frameworks generates core-shell heterostructures capable of building 3D hierarchical architectures with fully exposed active sites for boosting anodic lithium storage. image

关键词： heterostructured anode core-shell nanostructures carbon nanotubes polymeric sch.ff-bases covalent organic frameworks BATTERIES

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Preparation of Diamond-like Carbon Films on the Surface of Ti Alloy by Electro-deposition

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Journal of mat.rials Science & Technology 2004年第3期20卷 367-368页

作者： Feng.ei SHEN Hongwei WANG Dijiang WEN sch.ol of mat.rials eng.neering,Suzhou University,Suzhou 215021,China sch. of mat. eng. Suzhou Univ. Suzhou 215021 China

In this paper, diamond-like carbon (DLC) films were deposited on Ti alloy by electro-deposition. DLC films were brown andcomposed of the compact grains whose diameter was about 400 nm. Examined by XPS, the main composition of the filmswas carbon. In the Raman spectrum, there were a broad peak at 1350 cm^(-1) and a broad peak at 1600 cm^(-1), which indicatedthat the films were DLC films.

关键词： Diamond-like carbon film Electro-deposition Ti alloy Surface

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Waterproof Perovskite Quantum Dots for In-vivo Photoluminescence Bioimaging

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chem.CAL RESEARCH IN CHINESE UNIVERSITIES 2024年第5期40卷 901-906页

作者： Jiao, Ziyue Wang, Xinli Gao, Jie Huang, Xiao Wang, Yi Renmin Univ China Sch Chem & Life Resources Key Lab Adv Light Convers Mat & Biophoton Beijing 100872 Peoples R China

Perovskite quantum dots (PQDs) have demonstrated great promise in bioimaging applications owing to their outstanding photophysical properties. Nonetheless, their practicality is seriously limited by the instability of PQDs against moisture. Here we develop a post-synthetic ligand exchange strategy to construct silica-coated PQD (PQD@SiO2) nanocrystals, which results in the simultaneous improvement of photoluminescence efficiency and moisture stability. More importantly, compared to the classical in-situ ligand exchange method of fabricating PQD@SiO2, the issues of chem.cal etching and resultant photoluminescence degradation are judiciously overcome. Employing the proposed PQD@SiO2, we showcase their robust usefulness in labeling chlorella, paving the way for PQD-based in-vivo photoluminescence bioimaging methodology.

关键词： Perovskite Quantum dot Photoluminescence Stability Bioimaging LEAD HALIDE PEROVSKITES NANOWIRE LASERS NANOCRYSTALS EFFICIENT

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