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Bifunctional Liquid Metals Allow Electrical Insulating phase change materials to Dual-Mode Thermal Manage the Li-Ion Batteries

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Nano-Micro Letters 2022年第12期14卷 224-238页

作者： Cong Guo Lu He Yihang Yao Weizhi Lin Yongzheng Zhang Qin Zhang Kai Wu Qiang Fu College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China Department of Polymer Science and Engineering School of Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094People’s Republic of China

phase change materials(PCMs)are expected to achieve dual-mode thermal management for heating and cooling Li-ion batteries(LIBs)according to real-time thermal conditions,guaranteeing the reliable operation of LIBs in both cold and hot ***,we report a liquid metal(LM)modified polyethylene glycol/LM/boron nitride PCM,capable of dual-mode thermal managing the LIBs through photothermal effect and passive thermal *** geometrical conformation and thermal pathways fabricated through ice-template strategy are conformable to the LIB’s structure and heat-conduction ***,soft and deformable LMs are modified on the boron nitride surface,serving as thermal bridges to reduce the contact thermal resistance among adjacent fillers to realize high thermal conductivity of 8.8 and 7.6 W m^(−1) K^(−1) in the vertical and in-plane directions,*** addition,LM with excellent photothermal performance provides the PCM with efficient battery heating capability if employing a controllable lighting *** a proof-of-concept,this PCM is manifested to heat battery to an appropriate temperature range in a cold environment and lower the working temperature of the LIBs by more than 10℃ at high charging/discharging rate,opening opportunities for LIBs with durable working performance and evitable risk of thermal runaway.

关键词： phase change materials Liquid metal Thermal conductivity Photothermal conversion Battery thermal management

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The regulation mechanism and heat transfer enhancement of composite mixed paraffin and copper foam phase change materials

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Science China(Technological Sciences) 2023年第8期66卷 2346-2360页

作者： YANG HanXue ZHANG GuanHua DOU BinLin CUI GuoMin YAN XiaoYu LU Wei WANG ZiLong School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Environment and Sustainability Institute University of ExeterPenrynCornwall TR109FEUK

phase change materials(PCMs)have remarkable energy storage capacity and promising applications in the field of thermal control of electronic *** problem of thermal property improvement and heat transfer of PCMs in metal-foam heatsinks is an important task for thermal management of electronic *** paraffin samples were prepared by mixing appropriate proportions of paraffin(mass)at various *** scanning calorimetry analysis revealed that the maximum enthalpy of 206.3 J/g is obtained by mixing 20%of 17°C liquid paraffin and 80%of 29℃ solid *** and cooling cycling tests revealed that mixed paraffin exhibits excellent thermal stability and that the regulation method marginally affects thermal ***,composites were prepared by embedding PCM into a copper foam by melt *** thermal conductivity of the composites increased to 4.35 W/(m K),corresponding to 20 times its original *** addition,density functional theory and experimental results were in good agreement,indicating that the regulation method is practical and effective.

关键词： phase change materials regulation mechanism temperature dependence thermal conductivity heat transfer enhancement

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Crystal structure and thermochemical properties of bis(1-octylammonium) tetrachlorochromate phase change materials

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Chinese Physics B 2012年第8期21卷 126-133页

作者：卢冬飞邸友莹何东华 Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology College of Chemistry and Chemical EngineeringLiaocheng University

A new crystalline complex （C8H17NH3）2CdCI4（s）（abbreviated as CsCd（s）） is synthesized by liquid phase reaction. The crystal structure and composition of the complex are determined by single crystal X-ray diffraction, chemical analysis, and elementary analysis. It is triclinic, the space group is P-1 and Z = 2. The lattice potential energy of the title complex is calculated to be UpoT （CsCd（s））=978.83 ***^-1 from crystallographic data. Low-temperature heat capacities of the complex are measured by using a precision automatic adiabatic calorimeter over a temperature range from 78 K to 384 K. The temperature, molar enthalpy, and entropy of the phase transition for the complex are determined to be 307.3±0.15 K, 10.15±0.23 ***^-1, and 33.054-0.78 J.K^-***^-1 respectively for the endothermic peak. Two polynomial equations of the heat capacities each as a function of temperature are fitted by using the leastsquare method. Smoothed heat capacity and thermodynamic functions of the complex are calculated based on the fitted polynomials.

关键词： bis(1-octylammonium) tetrachlorochromate X-ray crystallography phase change materials low-temperature heat capacity solid-solid phase transition

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From octahedral structure motif to sub-nanosecond phase transitions in phase change materials for data storage

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Science China(Information Sciences) 2018年第8期61卷 132-146页

作者： Zhitang SONG Sannian SONG Min ZHU Liangcai WU Kun REN Wenxiong SONG Songling FENG State Key Laboratory of Functional materials for Informatics Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences

phase change random access memory(PCRAM) has been successfully applied in the computer storage architecture, as storage class memory, to bridge the performance gap between DRAM and Flashbased solid-state drive due to its good scalability, 3 D-integration ability, fast operation speed and compatible with CMOS technology. Focusing on phase change materials and PCRAM for decades, we have successfully developed 128 Mb embedded PCRAM chips, which can meet the requirements of most embedded systems.3 D Xpoint(3 D PCRAM), invented by Intel and Micron, has been regarded as a new breakthrough in the last 25 years since the application of NAND in 1989, which represents state-of-the-art memory *** technology has some remarkable features, such as the confined device structure with 20 nm size, the metal crossbar electrodes to reduce the resistance variations in PCRAM arrays, and the ovonic threshold switching selector that can provide a high drive current and a low leakage current. A good understanding of phase change mechanism is of great help to design new phase change materials with fast operation speed,low power consumption and long-lifetime. In this paper, we firstly review the development of PCRAM and different understandings on phase change mechanisms in recent years, and then propose a new view on the mechanism, which is based on the octahedral structure motifs and vacancies. Octahedral structure motifs are generally found in both amorphous and crystalline phase change materials. They are considered to be the basic units during phase transition, which are severely defective in the amorphous phase. These configurations turn into more ordered ones after minor local rearrangements, the growth of which results in the crystallization of rocksalt(RS) phase with a large amount of vacancies in the cation sites. Further driven by thermodynamic driving force, these vacancies move and layer along certain directions; consequently, the metastable RS structure transforms in

关键词： phase change memory phase change materials octahedral structure motif fast crystallization speed phase change mechanism

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Solid-liquid phase change materials microcapsules: Synthesis strategies,thermal storage and beyond

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Progress in Natural Science:materials International 2024年第4期34卷 615-631页

作者： Yan Gao Huan Liu Haoguan Gui Chao Yao Guolin Zhang Fuxin Liang Jiangsu Key Laboratory of Advanced Catalytic materials and Technology School of Petrochemical Engineering Changzhou University Department of Chemical Engineering Tsinghua University Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced materials Liaoning University

Thermal energy storage is crucial in the context of achieving carbon neutrality. phase change latent heat stands out among various thermal storage methods due to the high energy density of phase change materials(PCMs).PCMs possess unique characteristics such as tunable thermal storage or/and release processes, constant phasetransition temperatures, and changes in physical state. However, solid-liquid PCMs cannot be directly utilized due to the liquid leakage in their melted state. The encapsulation of PCM microcapsules(PCMMs) is essential for overcoming limitations and optimizing functionalities of the PCMs. Encapsulation strategies play a key role in considering factors like morphology, structure, physicochemical properties, and specific applications. Furthermore, PCMMs can expand their potential applications by incorporating functional nano-materials within their shells or introducing specific components into their cores during the synthesis process. This review examines various encapsulation strategies for PCMMs, including physical, physicochemical, and chemical methods. Various applications of PCMMs are summarized and analyzed with regards to the characteristics of PCMs in thermal storage, temperature control, and state transformation. Furthermore, the reinforcement strategies or/and design considerations of PCMMs are crucial for meeting specific requirements, such as conventional latent heat storage,thermal protection, and thermal-triggered intelligent materials. Finally, it discusses current challenges, proposed solutions, and future research directions in the field of PCMMs, particularly Janus particle modified PCMMs.

关键词： phase change materials Microcapsule Controllable synthesis Programmable mechanical behavior Controlled payload release

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Sugarcane derived carbon@CuS-octadecanol composite phase change materials for efficient solar thermal storage

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Progress in Natural Science:materials International 2024年第4期34卷 803-813页

作者： Shu-Yao Li Ying-Jie Huo Ting Yan Wei-Guo Pan College of Energy and Mechanical Engineering Shanghai University of Electric Power Key Laboratory of Clean Power Generation and Environmental Protection Technology in Mechanical Industry

Biomass carbon has the advantage of a wide spectral absorption range, which makes it great potential for solar thermal utilization. In this study, porous skeleton support materials of sugarcane-derived carbon were prepared by freeze-drying-high-temperature carbonization method using natural sugarcane as raw material, and the characterization results demonstrate that the porous skeleton of sugarcane-derived carbon has outstanding porous support properties. By combining CuS with sugarcane-derived carbon, a porous material with outstanding photothermal conversion performance was synthesized. Four photo-thermal composite phase change materials（CPCMs） were prepared, the maximum loading mass of the support material C600 to the phase change materials（PCMs） reached 79.77 %. The C600-CuS-OC had excellent thermal storage properties with an enthalpy of melting of 276.3 J/g and a thermal conductivity of 0.61 W·m-1·K-1. The photo-thermal conversion efficiency of C600-CuS-OC was 83.2 %. Sugarcane carbon-based CPCMs are a low-cost and high-efficiency solar thermal storage material, which has great potential for applications in solar thermal storage, biomass utilization, and thermal management.

关键词： Solar energy Biomass carbon Photo-thermal conversion Thermal storage Thermal management phase change materials

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Multifunctional HDPE/CNTs/PW composite phase change materials with excellent thermal and electrical conductivities

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Journal of materials Science & Technology 2021年第27期86卷 171-179页

作者： Xiaolong Li Xinxin Sheng Yongqiang Guo Xiang Lu Hao Wu Ying Chen Li Zhang Junwei Gu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education School of Chemistry and Chemical EngineeringHuazhong University of Science&TechnologyWuhan430074China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science&TechnologyWuhan430074China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an710072China School of materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China

The risk of leakage and low thermal conductivity severely hinder the wide application of phase change materials(PCMs).In this work,the high-density polyethylene/carbon nanotubes(HDPE/CNTs)porous scaffolds were successfully fabricated via a sacrificial template method followed by the general melt blending and water solvent ***,a series of paraffin wax HDPE/CNTs/PW composite PCMs were obtained combined with the simple vacuum impregnation *** obtained HDPE/CNTs porous scaffolds can effectively avoid the leakage of PW,meanwhile,the thermal conductivity and electrical conductivity of HDPE/CNTs/PW-3:7 are increased by 2.94 times and 13 orders of magnitude compared with the HDPE/PW-3:7 respectively,also,it exhibits high phase change enthalpy(153.95 J/g for melting enthalpy and 152.82 J/g for crystallization enthalpy).From the above perspectives,the HDPE/CNTs/PW-3:7 has promising potential value in the application of light-to-thermal conversion,electro-to-thermal conversion and thermal energy storage.

关键词： Paraffin wax HDPE/CNTs porous scaffolds phase change materials Thermal energy storage

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Exergy Analysis of Charge and Discharge Processes of Thermal Energy Storage System with Various phase change materials:A Comprehensive Comparison

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Journal of Thermal Science 2024年第2期33卷 509-521页

作者： Mojtaba TAHERI Fathollah POURFAYAZ Roghayeh HABIBI Akbar MALEKI Department of Renewable Energies and Environment Faculty of New Sciences and TechnologiesUniversity of TehranTehran***Iran Faculty of Mechanical Engineering Shahrood University of TechnologyShahrood***Iran

Thermal energy storage(TES) is of great importance in solving the mismatch between energy production and *** this regard,choosing type of phase change materials(PCMs) which are widely used to control heat in latent thermal energy storage systems,plays a vital role as a means of TES ***,this field suffers from lack of a comprehensive investigation on the impact of various PCMs in terms of *** address this issue,in this study,in addition to indicating the melting temperature and latent heat of various PCMs,the exergy destruction and exergy efficiency of each material are estimated and compared with each ***,in the present work the impact of PCMs mass and ambient temperature on the exergy efficiency is *** results proved that higher latent heat does not necessarily lead to higher exergy ***,to obtain a suitable exergy efficiency,the specific heat capacity and melting temperature of the PCMs must also be *** to the results,LiF-CaF_(2)(80.5%:19.5%,mass ratio) mixture led to better performance with satisfactory exergy efficiency(98.84%) and notably lower required mass compared to other ***,the highest and lowest exergy destruction are belonged to GR25 and LiF-CaF_(2)(80.5:19.5) mixture,respectively.

关键词： exergy analysis phase change materials thermal energy storage exergy efficiency

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From sawdust waste to high-value hierarchical ceramics-based phase change materials: Efficient dual functional thermal and solar energy storage

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Science China(Technological Sciences) 2023年第9期66卷 2625-2636页

作者： LIU XiangLei WEI PeiDong LUO QingYang XU Qiao WANG JianGuo LV ShuShan TIAN Yang YAO HaiChen XUAN YiMin School of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Integrated Energy Institute Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Latent heat thermal energy storage(LHTES) technology is gaining extensive attention due to its capability to balance supply and demand mismatch in solar energy utilization. However, phase change material as the core of storing latent heat still suffers from low thermal conductivity and poor shape stability, which severely restricts its practical application. Here, an eco-friendly strategy for achieving high-performance dual functional thermal and solar energy storage is proposed via turning wood processing waste into high-value hierarchical porous SiC ceramic-based composite phase change materials. The porosity of prepared porous SiC skeletons is highly adjustable from 59.4% to 90.2%, overcoming low porosity limitations of traditional wood materials and enabling tunable energy storage density for various applications. High thermal conductivity is achieved by benefiting from large grains and continuous skeletons with a value up to 37.93 and 1.87 W/(m K) for porosity of 59.4% and 90.2%, *** stabilities are demonstrated with only slight decreases of thermal conductivity and energy storage density over 1000 cycles and good anti-leakage properties are confirmed due to capillary adsorption forces induced by hierarchical pores. Benefiting from high thermal conductivity and high solar absorptance, fast and efficient solar thermal energy storage is successfully demonstrated. This work provides a new strategy for the high-value utilization of wood processing waste and efficient thermal/solar energy storage.

关键词： sawdust waste silicon carbide ceramics phase change materials thermal energy storage solar energy

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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

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