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Electrospinning-hot pressing technique for the fabrication of thermal and electrical storage membranes and its applications

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 1945-1964页

作者： Panpan Che Baoshan Xie Penghui Cao Youfu Lv Daifei liu Huali Zhu Xianwen Wu Zhangxing He Jian Chen chuanchang li Key Laboratory of Renewable Energy Electric-Technology of Hunan Province School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410114China State Key Laboratory of Disaster Prevention&Reduction for Power Grid Changsha University of Science and TechnologyChangsha 410114China School of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China

The combination of electrospinning and hot pressing,namely the electrospinning-hot pressing technique(EHPT),is an efficient and convenient method for preparing nanofibrous composite materials with good energy storage *** emerging composite membrane prepared by EHPT,which exhibits the advantages of large surface area,controllable morphology,and compact structure,has attracted immense *** this paper,the conduction mechanism of composite membranes in thermal and electrical energy storage and the performance enhancement method based on the fabrication process of EHPT are systematically ***,the state-of-the-art applications of composite membranes in these two fields are *** particular,in the field of thermal energy storage,EHPT-prepared membranes have longitudinal and transverse nanofibers,which generate unique thermal conductivity pathways;also,these nanofibers offer enough space for the filling of functional ***,EHPT-prepared membranes are beneficial in thermal management systems,building energy conservation,and electrical energy storage,e.g.,improving the electrochemical properties of the separators as well as their mechanical and thermal *** application of electrospinning-hot pressing membranes on capacitors,lithium-ion batteries(liBs),fuel cells,sodium-ion batteries(SIBs),and hydrogen bromine flow batteries(HBFBs)still requires *** the future,EHPT is expected to make the field more exciting through its own technological breakthroughs or be combined with other technologies to produce intelligent materials.

关键词： electrospinning-hot pressing technique thermal storage electrical storage composite membranes nanofiber

Modified sepiolite stabilized stearic acid as a form-stable phase change material for thermal energy storage

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International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1835-1845页

作者： chuanchang li Xinke Peng Jianjun He Jian Chen Key Laboratory of Renewable Energy Electric-Technology of Hunan Province School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha 410114China

Sepiolite(ST) was used as a supporting matrix in compiste phase change materials(PCMs) due to its unique microstructure, good thermal stability, and other raw material advantages. In this paper, microwave acid treatment were innovatively used for the modification of sepiolite. The modified sepiolite(ST_(m)) obtained in different hydrochloric acid concentrations(0.25, 0.5, 0.75, and 1.0 mol·L^(-1)) was added to stearic acid(SA) via vacuum impregnation method. The thermophysical properties of the composites were changed by varying the hydrochloric acid concentration. The SA-ST_(m0.5)obtained by microwave acid treatment at 0.5 mol·L^(-1)hydrochloric acid concentration showed a higher loading capacity(82.63%) than other composites according to the differential scanning calorimeter(DSC) analysis. The melting and freezing enthalpies of SA-ST_(m0.5)were of 152.30 and 148.90 J·g^(-1), respectively. The thermal conductivity of SA-ST_(m0.5)was as high as 1.52 times that of pure SA. In addition, the crystal structure, surface morphology, and microporous structure of ST_(m)were studied, and the mechanism of SAST_(m0.5)performance enhancement was further revealed by Brunauere Emmett Teller(BET) analysis. Leakage experiment showed that SAST_(m0.5)had a good morphological stability. These results demostrate that SA-ST_(m0.5)has a potential application in thermal energy storage.

关键词： sepiolite stearic acid phase change materials thermal energy storage

Emerging low-density polyethylene/paraffin wax/aluminum composite as a form-stable phase change thermal interface material

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 772-781页

作者： chuanchang li Weixuan Wang Xiaoliang Zeng Chunxuan liu Rong Sun School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Hunan Xiangtou light Material Technology Co. Ltd.Changsha 410012China

Thermal interface materials(TIMs) play a vital role in the thermal management of electronic devices and can significantly reduce thermal contact resistance(TCR). The TCR between the solid–liquid contact surface is much smaller than that of the solid–solid contact surface, but conventional solid–liquid phase change materials are likely to cause serious leakage. Therefore, this work has prepared a new formstable phase change thermal interface material. Through the melt blending of paraffin wax(PW) and low-density polyethylene(LDPE), the stability is improved and it has an excellent coating effect on PW. The addition of aluminum(Al) powder improves the low thermal conductivity of PW/LDPE, and the addition of 15wt% Al powder improves the thermal conductivity of the internal structure of the matrix by 67%. In addition, the influence of the addition of Al powder on the internal structure, thermal properties, and phase change behavior of the PW/LDPE matrix was systematically studied. The results confirmed that the addition of Al powder improved the thermal conductivity of the material without a significant impact on other properties, and the thermal conductivity increased with the increase of Al addition. Therefore, morphologically stable PW/LDPE/Al is an important development direction for TIMs.

关键词： paraffin wax low-density polyethylene phase change materials thermal interface materials form stability

Mica-stabilized polyethylene glycol composite phase change materials for thermal energy storage

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 168-176页

作者： Dongyao Zhang chuanchang li Niangzhi lin Baoshan Xie Jian Chen School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China

Mica was used as a supporting matrix for composite phase change materials(PCMs)in this work because of its distinctive morphology and *** PCMs were prepared using the vacuum impregnation method,in which mica served as the supporting material and polyethylene glycol(PEG)served as the *** transform infrared and X-ray diffraction analysis confirmed that the addition of PEG had no effect on the crystal structure of ***,no chemical reaction occurred between PEG and mica during the vacuum impregnation process,and no new substance was *** maximum load of mica-stabilized PEG was 46.24%,the phase change temperature of M_(400)/PEG was 46.03℃,and the latent heat values of melting and cooling were 77.75 and 77.73 J·g^(−1),*** thermal conductivity of M_(400)/PEG was 2.4 times that of pure *** thermal infrared images indicated that the thermal response of M_(400)/PEG improved relative to that of pure *** leakage test confirmed that mica could stabilize PEG and that M_(400)/PEG had great form-stabilized *** results demonstrate that M_(400)/PEG has potential in the field of building energy conservation.

关键词： mica polyethylene glycol phase change materials thermal energy storage

Multiple structure graphite stabilized stearic acid as composite phase change materials for thermal energy storage

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International Journal of Mining Science and Technology 2022年第6期32卷 1419-1428页

作者： Xinbo Zhao chuanchang li Kaihao Bai Baoshan Xie Jian Chen Qingxia liu School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China Julong College Shenzhen Technology UniversityShenzhen 518118China

This paper used 3 types of graphite with different physical structures as the porous matrix to prepare composite phase change materials(PCMs),and investigated their photo-thermal conversion performance and application in battery thermal *** structure graphite minerals,including microcrystalline graphite(MG),scale graphite(SG),and expanded graphite(EG)were used as porous matrix,while stearic acid(SA)acts as the phase change *** vacuum impregnation method was applied to prepare SA/MG,SA/SG,SA/EG,and SA/MG1,and SA/EG1was/were prepared by the ethyl alcohol *** show that the thermal conductivities of all composite phase change materials were 10.82 to 22.06 times higher than that of the pure ***(TG)analysis showed that the loadages of SA were 43.61%,18.74%,and 92.66%for SA/MG,SA/SG,and SA/EG *** load rates of SA were 18.98%and 18.88%for SA/MG1 and SA/EG1,*** the 3 types of graphite materials of different dimensions,the BET(Brunauer,Emmett,and Teller)surface area determines the maximum load of *** Fourier-transform infrared(FTIR)and X-ray diffraction(XRD)results indicated that there was good compatibility between the SA and the *** SA/EG1 has better thermophysical properties in heat energy storage and release *** thermal infrared images show that SA/EG1 has higher sensitivity to the temperature ***/EG1 has better photo-heat conversion performance than SA/SG and SA/MG1 attributed to the multilayer structure of ***/EG has better thermal management performance in the li-ion batteries discharge process.

关键词： Phase change material Microcrystalline graphite Scale graphite Expanded graphite Photo-thermal conversion Thermal management

激光选区熔化成形316不锈钢增材制造研究进展

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上海工程技术大学学报 2024年第2期38卷 158-164页

作者：张海波刘延辉张慧研沈子昊李传昌上海工程技术大学机械与汽车工程学院上海201620 上海工程技术大学材料科学与工程学院上海201620

激光选区熔化(selective laser melting,SLM)技术在航天汽车等金属增材制造领域具有广阔的应用前景。总结SLM316不锈钢材料在工艺、组织、性能和应用等方面的研究进展,分析探讨存在的问题与解决方法。分析SLM生产加工过程中生产工艺、... 详细信息

激光选区熔化(selective laser melting,SLM)技术在航天汽车等金属增材制造领域具有广阔的应用前景。总结SLM316不锈钢材料在工艺、组织、性能和应用等方面的研究进展,分析探讨存在的问题与解决方法。分析SLM生产加工过程中生产工艺、产品质量和性能稳定性及后处理工艺等流程中存在的问题,进一步研究316不锈钢增材显微组织和力学特性,分析工艺过程对组织和性能的影响,合理控制激光增材制造成形过程,为技术在产业应用提供支撑。

关键词：车辆工程激光熔化焊接工艺研究综述

System Energy and Efficiency Analysis of 12.5 W VRFB with Different Flow Rates

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Energy Engineering 2023年第12期120卷 2903-2915页

作者： Kehuan Xie Longhai Yu chuanchang li School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha410114China Hunan Vanadium Valley New Energy Technology Co. Ltd.Changsha410114China Big Pawer Electrical Technology Xiangyang Co. Ltd.Xiangyang441057China

Vanadium redox flow battery(VRFB)is considered one of the most potential large-scale energy storage technolo-gies in the future,and its electrolyte flow rate is an important factor affecting the performance of *** study the effect of electrolyte flow rate on the performance of VRFB,the hydrodynamic model is established and a VRFB system is *** results show that under constant current density,with the increase of electrolyte flow rate,not only the coulombic efficiency,energy efficiency,and voltage efficiency will increase,but also the capacity and energy discharged by VRFB will also *** on the other hand,as the flow rate increases,the power of the pump also increases,resulting in a decrease in system *** energy discharged by the system does not increase with the increase in flow *** the balance between efficiency and pump power loss,it is experimentally proved that 120 mL·min-1 is the optimal working flow rate of the VRFB system,which can maximize the battery performance and discharge more energy.

关键词： Vanadium redox flow battery flow rate system energy efficiency

Stearic Acid/Copper Foam as Composite Phase Change Materials for Thermal Energy Storage

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Journal of Thermal Science 2020年第2期29卷 492-502页

作者： li chuanchang ZHAO Xinbo ZHANG Bo XIE Baoshan HE Zhangxing CHEN Jian HE Jianjun School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China

The application of stearic acid in the latent thermal energy storage(LTES) systems is hindered due to its lower heat transfer rate. Stearic acid(SA) was blended with copper foam(CF) of pore numbers per inch(PPI) of 5, 20, and 40 to prepare composite phase change materials via a molten impregnation method. The thermal physical properties including latent heat, phase change temperature, and thermal energy storage density of composites were characterized. The thermogravimetric analysis indicated that the loadages of SA of SA/CF(5 PPI), SA/CF(20 PPI), and SA/CF(40 PPI) were 74.69%, 71.03%, and 63.54%, respectively;The latent heat of SA/CF(5 PPI), SA/CF(20 PPI), and SA/CF(40 PPI) were determined to 139.9 J·g^-1, 132.7 J·g^-1, and 117.8 J·g^-1, respectively. Meanwhile, the infrared thermal images of SA and SA/CF composites were provided to demonstrate the thermal energy storage and dissipation capability intuitively by the temperature response and surface temperature distribution. The infrared thermal images indicated the addition of CF also reduced the fluidity of liquid SA, and the SA/CF(40 PPI) had better internal heat transfer uniformity and thermal diffusion performance than SA/CF(5 PPI) and SA/CF(20 PPI). All these thermal properties suggested SA/CF(40 PPI) has the potential application in the latent thermal energy storage.

关键词： stearic acid latent thermal energy storage copper foam

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相变储冷技术及其在空调系统中的应用

储能科学与技术 2023年第1期12卷 180-197页

作者：李沐李亚溪李传常长沙理工大学能源与动力工程学院湖南长沙410114

储能是实现“双碳”目标的关键支撑技术之一。相变储能因能实现能量的存储及释放、有效提高能源利用效率,是目前解决能源供需不平衡问题的重要途径。随着人们对冷能需求的增长,相变储冷技术受到了研究者的广泛关注,但与传统相变储热技... 详细信息

储能是实现“双碳”目标的关键支撑技术之一。相变储能因能实现能量的存储及释放、有效提高能源利用效率,是目前解决能源供需不平衡问题的重要途径。随着人们对冷能需求的增长,相变储冷技术受到了研究者的广泛关注,但与传统相变储热技术相比,相变储冷技术这一领域的综述文章还较少。本文梳理了相变储冷技术的基本工作原理和特点,介绍了应用于储冷空调系统相变材料的不同种类、性质及其优缺点,阐述了相变储冷关键技术,包括物性提升关键技术、传热强化关键技术、封装定型关键技术,分析了储冷空调中的不同储冷器件结构(板式、球式、螺旋管式、壳管式)和应用技术。进而总结了相变储冷技术在常规储冷空调系统及冷链运输储冷空调系统中的应用。本文对储冷技术目前的发展现状及前景分别做出了较全面的总结和分析,指出了相变材料性能的改善、储冷器件的传热强化、空调系统的COP和节能率的提升、保持系统的长期稳定运行是今后对储冷空调系统的研究重点。

关键词：储冷技术相变材料储冷器件空调系统