Enhanced High-Temperature Energy Storage Performance of All-Organic Composite Dielectric via Constructing Fiber-Re in forced Structure

Optimizing the high-temperature energy storage characteristics of energy storage dielectrics is of great significance for the development of pulsed power devices and power control systems.Selecting a polymer with a higher glass transition temperature(T_(g))as the matrix is one of the effective ways to increase the upper limit of the polymer operating temperature.However,current high-T_(g)polymers have limitations,and it is difficult to meet the demand for high-temperature energy storage dielectrics with only one polymer.For example,polyetherimide has high-energy storage efficiency,but low breakdown strength at high temperatures.Polyimide has high corona resistance,but low high-temperature energy storage efficiency.In this work,combining the advantages of two polymer,a novel high-T_(g)polymer fiber-reinforced microstructure is designed.Polyimide is designed as extremely fine fibers distributed in the composite dielectric,which will facilitate the reduction of high-temperature conductivity loss for polyimide.At the same time,due to the high-temperature resistance and corona resistance of polyimide,the high-temperature breakdown strength of the composite dielectric is enhanced.After the polyimide content with the best high-temperature energy storage characteristics is determined,molecular semiconductors(ITIC)are blended into the polyimide fibers to further improve the high-temperature efficiency.Ultimately,excellent high-temperature energy storage properties are obtained.The 0.25 vol%ITIC-polyimide/polyetherimide composite exhibits high-energy density and high discharge efficiency at 150℃(2.9 J cm^(-3),90%)and 180℃(2.16 J cm^(-3),90%).This work provides a scalable design idea for high-performance all-organic high-temperature energy storage dielectrics.

Ultraviolet‑Irradiated All‑Organic Nanocomposites with Polymer Dots for High‑Temperature Capacitive Energy Storage

Polymer dielectrics capable of operating efficiently at high electric fields and elevated temperatures are urgently demanded by next-generation electronics and electrical power systems.While inorganic fillers have been extensively utilized to improved high-temperature capacitive performance of dielectric polymers,the presence of thermodynamically incompatible organic and inorganic components may lead to concern about the long-term stability and also complicate film processing.Herein,zero-dimensional polymer dots with high electron affinity are introduced into photoactive allyl-containing poly(aryl ether sulfone)to form the all-organic polymer composites for hightemperature capacitive energy storage.Upon ultraviolet irradiation,the crosslinked polymer composites with polymer dots are efficient in suppressing electrical conduction at high electric fields and elevated temperatures,which significantly reduces the high-field energy loss of the composites at 200℃.Accordingly,the ultraviolet-irradiated composite film exhibits a discharged energy density of 4.2 J cm^(−3)at 200℃.Along with outstanding cyclic stability of capacitive performance at 200℃,this work provides a promising class of dielectric materials for robust high-performance all-organic dielectric nanocomposites.

Natural Lignin:A Sustainable and Cost-Effective Electrode Material for High-Temperature Na-Ion Battery

Rechargeable sodium-ion batteries usually suffer from accelerated electrode destruction at high temperatures and high synthesis costs of electrode materials.Therefore,it is highly desirable to explore novel organic electrodes considering their cost-effectiveness and large adaptability to volume changes.Herein,natural biomass,pristine lignin,is employed as the sodium-ion battery anodes,and their sodium storage performance is investigated at room temperature and 60℃.The lignin anodes exhibit excellent high-temperature sodium-ion battery performance.This mainly results from the generation of abundant reactive sites(C=O)due to the high temperature-induced homogeneous cleavage of the C_(β)-O bond in the lignin macromolecule.This work can inspire researchers to explore other natural organic materials for large-scale applications and high-value utilization in advanced energy storage devices.

High-temperature BaTiO_(3) -based ceramic capacitors by entropy engineering design

High-performance BaTiO_(3)(BTO)-based dielectric ceramics have great potential for high-power energy storagedevices. However, its poor temperature reliability and stability due to its low Curie temperature impedes the development ofmost electronic applications. Herein, a series of BTO-based ceramics are designed and prepared on the basis of entropyengineering. Owing to the incorporation of Bi(Mg_(0.5)Ti_(0.5))O_(3), relaxation behavior and low dielectric loss at high temperatureshave been achieved. Moreover, the high-entropy strategy also promotes lattice distortion, grain refinement and excellentresistance, which together increase the breakdown field strength. These simultaneous effects result in outstanding energystorage performance, ultimately achieving stable energy density (U_(e)) of 5.76 J·cm^(−3) and efficiency ( η) of 89%. Mostimportantly, the outstanding temperature stability makes high-entropy BTO-based ceramics realize a significant energystorage density of 4.90 0.14 J·cm^(−3) with the efficiency above 89%, spanning a wide temperature range of 25–250 ℃, aswell as cycling reliability with negligible performance deterioration after 3 105 cycles at 300 kV∙cm^(−1) and 200 ℃. Thisresearch presents an effective method for designing temperature-stable and reliable dielectrics with comprehensive energystorage performance.

A High-Temperature β-Phase NaMnO2 Stabilized by Cu Doping and Its Na Storage Properties

The high-temperature β-phase NaMnO2 is a promising material for Na-ion batteries（NIBs） due to its high capacity and abundant resources. However, the synthesis of phase-pure -NaMnO2 is burdensome and costineffective because it needs to be sintered under oxygen atmosphere at high temperature and followed by a quenching procedure. Here we first report that the pure β phase can be stabilized by Cu-doping and easily synthesized by replacing a proportion of Mn with Cu via a simplified process including sintering in air and cooling to room temperature naturally. Based on the first-principle calculations, the band gap decreases from 0.7 eV to 0.3 eV, which indicates that the electronic conductivity can be improved by Cu-doping. The designed -NaCu（0.1）Mn（0.9）O2 is applied as cathode in NIBs, exhibiting an energy density of 419 Wh/kg and better performance in terms of rate capability and cycling stability than those in the undoped case.

Preparation and Thermal Shock Resistance of Mullite Ceramics for High Temperature Solar Thermal Storage

Mullite thermal storage ceramics were prepared by low-cost calcined bauxite and kaolin.The phase composition,microstructure,high temperature resistance and thermophysical properties were characterized by modern testing techniques.The experimental results indicate that sample A3(bauxite/kaolin ratio of 5:5)sintered at 1620℃has the optimum comprehensive properties,with bulk density of 2.83 g·cm^(-3)and bending strength of 155.44 MPa.After 30 thermal shocks(1000℃-room temperature,air cooling),the bending strength of sample A3 increases to 166.15 MPa with an enhancement rate of 6.89%,the corresponding thermal conductivity and specific heat capacity are 3.54 W·(m·K)^(-1)and 1.39 kJ·(kg·K)^(-1)at 800℃,and the thermal storage density is 1096 kJ·kg^(-1)(25-800 mullite ceramics;sintering properties;high-temperature thermal storage;thermal shock resistance).Mullite forms a dense and continuous interlaced network microstructure,which endows the samples high thermal storage density and high bending strength,but the decrease of bauxite/kaolin ratio leads to the decrease of mullite content,which reduces the properties of the samples.

Germination pretreatment and storage behavior of Terminalia laxiflora seed

Terminalia laxiflora Engl.&Diels.is an important indigenous and multi-purpose species in Ethiopia.However threatened due to low germination and its storage behavior is unknown.In this study,we aimed to(1)test pretreatments for breaking the dormancy of T.laxiflora seed and(2)determine its storage behavior.Seeds were subjected to four pretreatments such as soaking,scarification,high-temperature,and control.Experiments were done before storage and after 2 years of dry storage at cold temperature(-10℃)based on randomized design with four replicates.The first round of experimental results showed that T.laxiflora seeds with high temperature treatments at 78℃for 10 min showed significantly higher germination percentage(80%).In the second round experiment,high-temperature treatment at 78℃for15 min,cold water soaking,high-temperature treatment at78℃for 10 min,hot water soaking,and high-temperature treatment at 78℃for 5 min showed significantly higher germination percentage from the remaining treatments(75,64,58,56,and 53%,respectively).To break the dormancy of T.laxiflora seed and attain good germination result,seeds should be pretreated with high-temperature at 78℃for 10 min to test the initial germination before storage and should be pretreated with high-temperature(at 78℃for15,10,or 5 min),soaked in cold,or hot water for 24 h to monitor the germination after storage.The two experiments show that T.laxiflora produces orthodox seed.

基于智能感官和气相色谱-离子迁移谱分析贮藏年限对酱香型白酒的影响

该研究以采集自河北省邯郸市永不分梨酒业股份有限公司的第四轮次基酒为主要研究对象,基于智能感官和气相色谱-离子迁移谱(gas chromatography-ion mobility spectrometry,GC-IMS)技术,探究了储藏年限对酱香型白酒感官品质和风味特征的影响。结果表明,不同贮藏年限酱香型白酒中酸酯总量和总酯含量分别在74.16~85.40 mmol/L和2.89~3.64 g/L,且随着白酒贮藏年限的增加,酒体中酸酯总量、总酯含量、鲜味、有机硫化物和萜类物质含量呈明显下降趋势,而酒体的明亮度、酸味和芳香类物质含量则明显升高。通过GC-IMS共定性了49种挥发性化合物,可以有效区分不同储藏年限酱香型白酒。筛选出18种变量投影重要性(variable importance in the projection,VIP)值>1且P<0.05的关键差异化合物,并从中挑选出6个相对气味活度值(relative odor activity value,ROAV)>1的香气化合物,其中3-甲基丁酸乙酯和2-甲基丁酸乙酯在贮藏10年的酱香型白酒中ROAV显著偏高(P<0.05),且其对白酒的明亮度、酸味、苦味、涩味、咸味和芳香风味等感官品质具有积极作用。因此,贮藏10年的酱香型白酒品质更佳,该研究为酱香型白酒选择合适的贮藏时间提供了理论依据。

Dielectric nanocomposites with superb high-temperature capacitive performance based on high intrinsic dielectric constant polymer

Advancements in power electronics necessitate dielectric polymer films capable of operating at high temperatures and possessing high energy density.Although significant strides have been achieved by integrating inorganic fillers into high-temperature polymer matrices,the inherently low dielectric constants of these matrices have tempered the magnitude of success.In this work,we report an innovative nanocomposite based on sulfonylated polyimide(SPI),distinguished by the incorporation of sulfonyl groups within the SPI backbone and the inclusion of wide bandgap hafnium dioxide(HfO_(2))nanofillers.The nanocomposite has demonstrated notable enhancements in thermal stability,dielectric properties,and capacitive performance at elevated temperatures.Detailed simulations at both molecular and mesoscopic levels have elucidated the mechanisms behind these improvements,which could be attributed to confined segmental motion,an optimized electronic band structure,and a diminished incidence of dielectric breakdown ascribed to the presence of sulfonyl groups.Remarkably,the SPI-HfO_(2)nanocomposite demonstrates a high charge-discharge efficiency of 95.7%at an elevated temperature of 150℃and an applied electric field of 200 MV/m.Furthermore,it achieves a maximum discharged energy density of 2.71 J/cm^(3),signalling its substantial potential for energy storage applications under extreme conditions.

Advanced solid-solid phase change thermal storage material

The practicality of conventional solid-liquid phase change materials(PCMs)is adversely restricted by liquid phase leakage,large volume expansion,shape instability,and severe corrosion in high-temperature thermal management systems.This highlight presents the latest development to resolve these challenges by designing ultrahigh-performance high-temperature Ni-Mn-Ti solid-solid PCMs using martensitic phase transition strategy,offering a new paradigm to develop advanced wide-temperature high-temperature metallic solid-solid phase change thermal storage materials.

低度瓶装固态法、调香白酒贮存期的变化

低度白酒产品的贮存期稳定性是产品质量的一个关键性指标,通过试验对比分析,初步探讨了不同生产方式(固态法、调香白酒)的低度瓶装白酒在相同贮存期内主要香味物质的变化规律。以32度、38度产品为试验对象,研究了总酸、总酯、有机酸、酯类等香味物质成分的贮存期变化情况。

赊店浓香型原酒在不同贮存条件下的变化规律探讨

新酒经一定时间的贮存后,酒体会变得比较协调,风味也有所改进。采用感官品评、理化分析和气相色谱分析方法,对原酒贮存过程中,酒质与贮存容器、贮存时间、贮存环境的关系进行了研究。结果发现,短时间内,露天罐区贮存比陶坛罐贮存的老熟作用更明显,高温贮存比常温贮存的老熟效果快;贮存1年后原酒酒质山体洞藏>马蹄窖藏>露天不锈钢罐区,结合贮存规律调整适当合理的贮存方式不仅可以使酒体变得丰满,还能给勾调工作带来方便。

浓香型白酒在贮存过程中主要风味物质变化规律的研究

采用气相色谱法、常规分析法对不同酒度的浓香型白酒在贮存过程中主要风味物质的变化规律进行分析研究。结果显示,不同酒度的浓香型白酒在贮存过程中,己酸乙酯、乳酸乙酯、乙酸乙酯、丁酸乙酯以及酒精度均呈现下降的趋势,只有总酸呈现上升的趋势。通过研究不同酒度的浓香型白酒主要理化指标的变化规律,可为浓香型白酒的贮存提供一定的科学依据和参考价值。

High-temperature treatment induced carbon anode with ultrahigh Na storage capacity at low-voltage plateau

Sodium-ion batteries （NIBs） show great prospect on the energy storage applications benefiting from thei low cost and the abundant Na resources despite the expected lower energy density compared wit lithium-ion batteries （LIBs）. To further enhance the competitive advantage, especially in energy densit3 developing the high-capacity carbon anode materials can be one of the effective approaches to realiz this goal. Herein, we report a novel carbon anode made from charcoal with a high capacity of ~400 Ah g i, wherein about 85% （〉330 mAh g^-1） of its total capacity is derived from the long plateau regio below ~0.1 V. which differs fiom those of typical hard carbon materials （~300 mAh g^-l） in NIBs but i similar to the graphite anode in LIBs. When coupled with air-stable Nao.gCuo.22Feo.3oMno.4802 oxid cathode, a high-energy density of ~240 Wh kg^-1 is achieved with good rate capability and cyclin stability. The discovery of this promising carbon anode is expected to further improve the energy densit of NIBs towards large-scale electrical energy storage.

Structure and high-temperature electrochemical properties of La_(0.60)Nd_(0.15)Mg_(0.25)Ni_(3.3)Si_(0.10) hydrogen storage alloys

The structure and high-temperature electrochemical properties of the as-cast and annealed （940 °C, 8 h） La0.60Nd0.15Mg0.25Ni3.3Si0.10 hydrogen storage alloys were investigated. The X-ray diffraction revealed that the multiphase structure of the as-cast alloy with LaNi5 phase as the main phase was converted into a double-phase structure with La2Ni7 phase as the main phase after annealing. The surface morphology studied by scanning electronic microscope （SEM） showed that the annealed alloy had a much higher anti-corrosion ability than the as-cast alloy. Both alloys presented excellent activation characteristics at all test temperatures. The maximum discharge capacity of the as-cast alloy decreased when the test temperature increased, while the temperature almost had no effect on the annealed alloy. As the test temperature increased, the cyclic stability and charge retention of both alloys decreased, and these properties were improved significantly by annealing.

Thermal Performances of High-Temperature Thermal Energy Storage System with Tin Embedded in Copper Matrix by Theoretical Methods

There is a critical need to develop advanced high-temperature thermal storage systems to improve efficiencies and reduce the costs of solar thermal storage system.In this work,two typical systems composed with Cu as matrix and Sn as the phase change material(PCM)are explored,namely,the 3-deimentional(3D)structure system by embedding Sn particles into Cu matrix and the 2-deimentional(2D)structure system by embedding Sn wires into Cu matrix.Given the thermophysical properties of a nanomaterial could be importantly different from that of a bulk one,we thus firstly derive the thermophysical properties of PCM and matrix theoretically,like the thermal conductivity by kinetic method and the specific heat capacity based on Lindemann’s criterion.And then,these properties are utilized to estimate the energy storage ability in both 3D and 2D structure system,and the influence of structure on heat transfer efficiency is theoretically investigated in both 3D and 2D structure system.Results turn out that 3D structure system is a better choice than a 2D structure system,because of larger specific surface area,a larger sensitive heat capacity and a larger thermal conductivity.When the feature size of the PCM decreases to be less than a critical value which is about 500 nm for Sn,the thermal conductivity of the system decreases exponentially while the heat storage capacity increases lineally.Moreover,when the feature size of Sn geometry is less than a critical value,which is 15 nm for 3D structure system and 25 nm for 2D structure,the Cu matrix can’t play a role in improving the effective thermal conductivity of the whole system.

不同储藏环境对铁皮石斛配制酒稳定性的影响

目的探究不同储藏环境对铁皮石斛配制酒(Dendrobium officinale blended liquor,DBL)稳定性的影响。方法通过测定不同储藏环境下DBL外观、风味、功效成分和酒体抗氧化能力等指标,评价其稳定性。结果在12周的储藏期内,低温(-10℃)储藏最有利于保持DBL外观、功效成分含量和酒体抗氧化活性的稳定,并且有助于保留药香、减弱糟味,但谐调感、净爽感有所变差,储藏期内DBL的整体感官变化不明显,风味成分总含量略有下降。高温(45℃)储藏对维持DBL外观、功效成分含量和酒体抗氧化活性的稳定效果较差,但有助于DBL整体感官,特别是谐调、劲爽和陈香方面的提升,风味物质中醛酮类、酯类含量下降,醇类、酸类增加。光照储藏会严重破坏DBL外观、风味、功效成分含量和酒体抗氧化活性,各类风味成分变化趋势与高温储藏相似,但风味成分总含量明显下降。结论在低温(-10℃)储藏最有利于保持DBL的稳定,且有助于保留药香、减弱糟味。本研究为配制酒行业选择合适的储藏环境,进而提高货架期提供了参考。

清香型白酒贮存后变化

实验选取酒样为生产时间范围从2014年2月到2021年12月期间的10个酒样作为分析的样本,探索贮存时间对白酒理化指标的影响。

浅谈清香型白酒食品安全追溯体系建设

白酒食品安全追溯体系建设是通过追踪和记录白酒生产、流转、销售、消费环节的信息和数据,经过数据分析了解生产销售全过程,从而保障白酒的质量和食品安全。阐述了清香型白酒食品安全追溯体系建设的重要意义和必要性,对白酒生产销售各个环节的追溯管理现状进行分析,为白酒生产链全过程追溯体系的建设提供了参考。

基于可持续理念的白酒包装盒设计研究

随着现代社会的快速发展,导致生态环境日益恶化,可持续发展是人类社会发展不可避免的命题。文章以可持续设计的基本理念和内涵为指导,对白酒包装盒现状及存在的主要问题进行调研分析,再结合典型设计案例研究构建白酒包装盒的可持续设计策略,即选择绿色包装材料、轻量化、再利用和以行为为中心,最后创造性地提出酒盒转化为密封储物罐的包装新形式。在白酒包装盒设计之初融入可持续理念,使酒盒利用更充分,不仅能为生态环境保护和生态文明建设提供有力帮助,还能为今后白酒包装盒的可持续设计提供一定的借鉴形式,最终更好地为企业和社会创造价值。