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Fast thermal responsive separators toward long-life and safe lithium metal batteries

Nano Research 2024年第4期17卷 2746-2754页

作者： Pingan Li Zhifang Liu Yitong Peng Shanshan Yang Tao Meng Yunhuan Hu yingjun jiang Hao Sun Qi Li Xianluo Hu State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Lithium metal batteries(LMBs)have been extensively investigated during the past decades because of their ultrahigh energy densities.With the increasing demand for energy density,however,the safety issue of LMBs has become a significant challenge.In particular,localized areas of increased temperature(namely,hotspots)may be induced and even exacerbated within LMBs by uneven current distribution,internal short circuits,or inadequate heat dissipation,which significantly sacrifices battery safety and cycle life.Here,we report the rational design and fabrication of a fast thermal responsive separator capable of inhibiting the growth of lithium dendrites and mitigating thermal propagation,thereby reducing the risk of thermal runaway.The as-achieved separator comprises both an electrospun membrane using a phase change material with superior thermal-storage ability and a thermally conductive modification layer of hexagonal boron nitride nanosheets with a fast heat-transfer feature.It is demonstrated that such a unique integration of heat conduction and heat storage enables the functional separator with attractive abilities to mitigate hotspots and inhibit the growth of lithium dendrites upon the cycling of LMBs.Moreover,pouch cells with the thermal-responsive separator,as well as numerical simulations,verify much enhanced safety and cycle life of LMBs.This work may offer a new conceptual design of intelligent separators that acts as a functional unit encapsulated within a single cell to boost in-situ thermal management,which will help to develop high-safety and energy-dense LMBs.

关键词： lithium metal batteries separators hotspots safety thermal management

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A monotone finite volume method for time fractional Fokker-Planck equations

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Science China Mathematics 2019年第4期62卷 783-794页

作者： yingjun jiang Xuejun Xu School of Mathematics and Statistics Changsha University of Science and Technology Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences School of Mathematical Sciences Tongji University

We develop a monotone ?nite volume method for the time fractional Fokker-Planck equations and theoretically prove its unconditional stability. We show that the convergence rate of this method is of order 1 in the space and if the space grid becomes suffciently ?ne, the convergence rate can be improved to order 2.Numerical results are given to support our theoretical ?ndings. One characteristic of our method is that it has monotone property such that it keeps the nonnegativity of some physical variables such as density, concentration,etc.

关键词： time fractional Fokker-Planck equations finite volume methods monotone convergence

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Dual surface/bulk engineering of Nb_(2)O_(5) for high-rate sodium storage

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Electron 2023年第2期1卷 73-81页

作者： yingjun jiang Xianluo Hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Orthorhombic Nb_(2)O_(5) is a highly promising fast-charging anode material for sodium-ion capacitors.However,its poor intrinsic electronic/ionic conductivity limits its performance.Here,we developed a one-step heat treatment method to create an N-doped carbon coating on the outside and S-doped Nb_(2)O_(5) on the inside(CN-SCN).Ionic liquids are used as the source of C/N/S,which synergistically enhance the surface and bulk electronic/ionic conductivity.The N-doped carbon coating on the surface exhibits excellent electronic conductivity and a low ion-diffusion barrier,thanks to the high nitrogen ratio and extremely low content(<2 wt%).Auger electron spectroscopy analysis confirms that S atoms detach from the carbon chain of the ionic liquids and enter the bulk Nb_(2)O_(5),resulting in S-doped Nb_(2)O_(5),significantly facilitating reaction kinetics.The CN-SCN electrodes exhibit outstanding rate capability,achieving a capacity of up to 94 mAh g^(−1) even at a high current rate of 50 C.When paired with activated carbon as the positive electrode,the sodium-ion capacitor with the CN-SCN anode exhibits a high-energy density of up to 59 Wh kg^(−1) and a long cycle life with 73%capacity retention after 10,000 cycles.This work opens up possibilities for low-cost and large-scale production of high-rate Nb_(2)O_(5) for sodium-storage applications.

关键词： fast reaction kinetics ionic liquids orthorhombic Nb_(2)O_(5) sodium-ion capacitors

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ON A MOVING MESH METHOD FOR SOLVING PARTIAL INTEGRO-DIFFERENTIAL EQUATIONS

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Journal of Computational Mathematics 2009年第6期27卷 713-728页

作者： Jingtang Ma yingjun jiang Kaili Xiang School of Economic Mathematics Southwestern University of Finance and Economics Chengdu 610074 China Department of Mathematics and Scientific Computing Changsha University of Science and Technology Changsha 410076 China

This paper develops and analyzes a moving mesh finite difference method for solving partial integro-differential equations. First, the time-dependent mapping of the coordinate transformation is approximated by a a piecewise linear function in time. Then, piecewise quadratic polynomial in space and an efficient method to discretize the memory term of the equation is designed using the moving mesh approach. In each time slice, a simple piecewise constant approximation of the integrand is used, and thus a quadrature is constructed for the memory term. The central finite difference scheme for space and the backward Euler scheme for time are used. The paper proves that the accumulation of the quadrature error is uniformly bounded and that the convergence of the method is second order in space and first order in time. Numerical experiments are carried out to confirm the theoretical predictions.

关键词： Partial integro-differential equations Moving mesh methods Stability and convergence.

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Deformation Properties of Remolded Loess Compacted via Vertical Vibration Compaction Method

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Journal of Traffic and Transportation Engineering(English Edition) 2023年

作者： Kejia Yuan yingjun jiang jiangtao Fan Chenfan Bai Wei Zhang Jinshun Xue Key Laboratory for Special Area Highway Engineering of Ministry of Education，Chang’an University Xi’an

To investigate the deformation properties of remolded loess subgrade under long-term cyclic dynamic loading， remolded loess specimens compacted via vertical vibration compaction method were produced and some factors influencing elasticstrain and cumulative plastic strain， which include the number of vibration cycles， depth， and water content， have been investigated. A prediction model for cumulative plastic deformation was established.In addition， the collapsible deformation properties of remolded loess were investigated. Results indicate that the elastic strain and plastic strain are decreased with increasing vibration cycles and depth and finally tend to be stable when the number of vibration cycles is more than 2000 and the depth exceeds 2.5 m. The elastic strain and cumulative plastic strain of compacted loess are increased by 7.2% and 13.0%， respectively， when the water content increases by 1%.The cumulative plastic deformation of remolded loess follows a logarithmic distribution. The elastic deformation and cumulative plastic deformation of loess subgrade are far less than the demands for elastic deformation and post-construction settlement of subgrade.As the compaction coefficient and water content are increased by 1%， the collapsibility coefficient of compacted loess is decreased by an average of 13.7% and 14.5%. Such investigations can prevent subgrade diseases and ensure the safety of subgrade filled with loess soils.

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超大粒径沥青混合料的黏弹特性及温度影响

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建筑材料学报 2024年第4期27卷 327-331,342页

作者：蒋应军易勇田甜张宇范江涛长安大学特殊地区公路工程教育部重点实验室陕西西安710064 长安大学公路学院陕西西安710064

为精准表征超大粒径沥青混合料(LSAM-50)柔性基层路面的动态黏弹力学响应,对LSAM-50进行动态模量试验,分析了温度对LSAM-50黏弹参数的影响,构建了基于广义对数Sigmoidal模型的黏弹参数主曲线以及基于广义Maxwell模型的黏弹性本构关系.... 详细信息

为精准表征超大粒径沥青混合料(LSAM-50)柔性基层路面的动态黏弹力学响应,对LSAM-50进行动态模量试验,分析了温度对LSAM-50黏弹参数的影响,构建了基于广义对数Sigmoidal模型的黏弹参数主曲线以及基于广义Maxwell模型的黏弹性本构关系.结果表明:温度对LSAM-50黏弹参数的影响显著,温度升高后LSAM-50模量的变化由集料嵌挤力主导,动态模量与存储模量随着温度的升高逐渐降低后趋于稳定;由于LSAM-50具有更大的粒径和集料嵌挤力,其高温抗变形能力比AC-20和AC-13更强;可用广义Maxwell模型构建LSAM-50的黏弹本构关系,其相关性不低于0.99.

关键词：超大粒径沥青混合料动态模量主曲线线黏弹性

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Highly efficient H-bonding charge-transfer complex for microsupercapacitors under extreme conditions of low temperatures

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Journal of Energy Chemistry 2020年第12期29卷 182-189页

作者： Libin Wang Ting Shu Songtao Guo Shi Chen yingjun jiang Xianluo Hu State Key Laboratory of Materials Processing and Die Sf Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Owing to sluggish ionic mobility at low temperatures, supercapacitors, as well as other energy-storage devices, always suffer from severe capacity decay and even failure under extreme low-temperature circumstances. Solar-thermal-enabled self-heating promises an attractive approach to overcome this issue.Here, we report a unique H-bonding charge-transfer complex with a high photothermal conversion efficiency of 79.5% at 405 nm based on chloranilic acid and albendazole. Integrated with a microsupercapacitor, the chloranilic acid-albendazole complex(CAC) film prompts an apparent temperature increase of 22.7 °C under 1 sun illumination at-32.6 °C, effectively elevating the working temperature of devices.As a result, the rate capability of the microsupercapacitor has been significantly improved with a 17-fold increase in capacitance at a current density of 60 μA cm^(-2), leading to outstanding low-temperature performances. Importantly, the integrated device is capable of working at a low temperature of-30 °C in the open air, which demonstrates the potential of CAC in practical applications for low-temperature ultracapacitive energy-storage devices.

关键词： Charge-transfer complexes Solar-thermal conversion Extreme conditions Microsupercapacitors Low temperature

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A numerical test method of California bearing ratio on graded crushed rocks using particle flow modeling

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Journal of Traffic and Transportation Engineering(English Edition) 2015年第2期2卷 107-115页

作者： yingjun jiang Louis Ngai Yuen Wong Jiaolong Ren Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an University School of Civil and Environmental Engineering Nanyang Technological University School of Transportation Southeast University

In order to better understand the mechanical properties of graded crushed rocks （GCRs） and to optimize the relevant design, a numerical test method based on the particle flow modeling technique PFC2D is developed for the California bearing ratio （CBR） test on GGRs. The effects of different testing conditions and micro-mechanical parameters used in the model on the CBR numerical results have been systematically studied. The reliability of the numerical technique is verified. The numerical results suggest that the influences of the loading rate and Poisson＇s ratio on the CBR numerical test results are not significant. As such, a loading rate of 1.0-3.0 mm/min, a piston diameter of 5 cm, a specimen height of 15 cm and a specimen diameter of 15 cm are adopted for the CBR numerical test. The numerical results reveal that the GBR values increase with the friction coefficient at the contact and shear modulus of the rocks, while the influence of Poisson＇s ratio on the GBR values is insignificant. The close agreement between the CBR numerical results and experimental results suggests that the numerical simulation of the CBR values is promising to help assess the mechanical properties of GGRs and to optimize the grading design. Be- sides, the numerical study can provide useful insights on the mesoscopic mechanism.

关键词： Graded crushed rocks Particle flow modeling California bearing ratio Numerical test Micro-mechanical parametersMesoscopic mechanism

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Safer Lithium-Ion Batteries from the Separator Aspect:Development and Future Perspectives

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Energy & Environmental Materials 2021年第3期4卷 336-362页

作者： Zhifang Liu yingjun jiang Qiaomei Hu Songtao Guo Le Yu Qi Li Qing Liu Xianluo Hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

With the rapid development of lithium-ion batteries(LIBs),safety problems are the great obstacles that restrict large-scale applications of LIBs,especially for the high-energy-density electric vehicle industry.Developing component materials(e.g.,cathode,anode,electrolyte,and separator)with high thermal stability and intrinsic safety is the ultimate solution to improve the safety of LIBs.Separators are crucial components that do not directly participate in electrochemical reactions during charging/discharging processes,but play a vital role in determining the electrochemical performance and safety of LIBs.In this review,the recent advances on traditional separators modified with ceramic materials and multifunctional separators ranging from the prevention of the thermal runaway to the flame retardant are summarized.The component–structure–performance relationship of separators and their effect on the comprehensive performance of LIBs are discussed in detail.Furthermore,the research challenges and future directions toward the advancement in separators for high-safety LIBs are also proposed.

关键词： energy storage high safety lithium-ion batteries separators thermal stability

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Lithium-ion insertion kinetics of Na-doped Li2TiSiO5 as anode materials for lithium-ion batteries

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Journal of Materials Science & Technology 2020年第22期54卷 18-25页

作者： Yueni Mei Yuyu Li Fuyun Li Yaqian Li yingjun jiang Xiwei Lan Songtao Guo Xianluo Hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Li2TiSiO5 receives much interest recently in lithium-ion battery anodes because of its attractive Liinsertion/extraction potential at 0.28 V(vs. Li+/Li), which bridges the potential gap between graphite and Li4 Ti5 O12. However, Li2TiSiO5 suffers from the low intrinsic electronic conductivity and sluggish Liion transfer kinetics. In this work, we report lithium-ion insertion kinetics of Li2TiSiO5 by Na doping,achieving high-rate capability. Rietveld refinement of X-ray diffraction results reveals that Na doping can enlarge the space of Li slabs, thus reducing the Li-ion transfer barrier and enhancing the Li-ion diffusion kinetics. According to first-principles calculations, Na doping can tune the band structure of Li2TiSiO5 from indirect to direct band, leading to improved electronic conductivity and electrochemical performance. In particular, the Na-doped Li2TiSiO5(Li1.95 Na(0.05)TiSiO5) electrode exhibits outstanding rate capability with a high capacity of 101 m A h g^(-1) at 5 A g^(-1) and superior cyclability with a reversible capacity of 137 m A h g^(-1) under 0.5 A g^(-1) over 150 cycles.

关键词： Lithium-ion batteries Li2TiSiO5 Anode Lithium-ion diffusion Na doping

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