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Fabrication of electrospun bilayer separators for lithium-sulfur batteries:A surface and structure dual modification strategy

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Science China(Technological Sciences) 2022年第12期65卷 3029-3038页

作者： XU Ming ZHANG XiaoQing YUAN Wei HUANG HongLin wu yaopeng WAN ZhenPing LU LongSheng TANG Yong School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640China

The severe shuttle effect problem of soluble polysulfides greatly hinders the development of long-life lithium-sulfur(Li-S)batteries,which can be improved by separator *** study develops a bilayer separator based on an effective surface and structure dual modification *** bilayer separator(named as TCNFs/SPNFs)is constructed by the integration of a carbon-based nanofiber layer(surface modification layer)with a polymer-based nanofiber layer(structure modification layer)through a facile electrospinning *** excellent electrolyte wettability of the nanofibers accelerates lithium-ion migration,while the good electronic conductivity of the carbon layer facilitates fast electron *** TiO_(2)and SiO_(2)nanoparticles embedded in the separator provide abundant active sites for immobilizing the *** to these synergistic effects,this multi-functional separator helps inhibit the shuttling problem and thus enhances the active sulfur *** as-prepared battery with the TCNFs/SPNFs separator delivers significantly enhanced the electrochemical performances,producing a low capacity decay rate of 0.061%per cycle at 1 C over 1000 cycles and an admirable rate capacity of 886.7 mAh g^(-1)at 2 *** with a high sulfur loading of 4.8 mg cm^(-2),a remarkable areal capacity of 6.0 mAh cm^(-2)is *** work is believed to provide a promising strategy to develop novel separators for high-performance Li-S batteries.

关键词： lithium-sulfur battery bilayer separator surface and structure dual modification strategy electrospinning nanofiber

High-Performance All-Printed Flexible Micro-Supercapacitors with Hierarchical Encapsulation

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Energy & Environmental Materials 2024年第4期7卷 262-268页

作者： Yuhang Yuan Wei Yuan yaopeng wu Xuyang wu Xiaoqing Zhang Simin Jiang Bote Zhao Yu Chen Chenghao Yang Liangxin Ding Zhenghua Tang Yingxi Xie Yong Tang School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640China School of Environment and Energy South China University of TechnologyGuangzhou 510006China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510006China

Printed micro-supercapacitors(MSCs)have shown broad prospect in flexible and wearable *** of previous studies focused on printing the electrochemically active materials paying less attention to other key components like current collectors and *** study presents an allprinting strategy to fabricate in-plane flexible and substrate-free MSCs with hierarchical *** new type of“all-in-one”MSC is constructed by encapsulating the in-plane interdigital current collectors and electrodes within the polyvinyl-alcohol-based hydrogel electrolyte via sequential *** bottom electrolyte layer of this fully printed MSCs helps protect the device from the limitation of conventional substrate,showing excellent *** MSCs maintain a high capacitance retention of 96.84%even in a completely folded *** optimal electrochemical performance can be achieved by providing ample and shorter transport paths for *** MSCs using commercial activated carbon as the active material are endowed with a high specific areal capacitance of 1892.90 mF cm^(-2)at a current density of 0.3 mA cm^(-2),and an outstanding volumetric energy density of 9.20 mWh cm^(-3)at a volumetric power density of 6.89 mW cm^(-3).For demonstration,a thermo-hygrometer is stably powered by five MSCs which are connected in series and wrapped onto a glass *** low-cost and versatile all-printing strategy is believed to diversify the application fields of MSCs with high capacitance and excellent flexibility.

关键词： all-printing flexible hierarchical encapsulation micro-supercapacitors substrate-free

Challenges and recent progress in thermal management with heat pipes for lithium-ion power batteries in electric vehicles

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Science China(Technological Sciences) 2021年第5期64卷 919-956页

作者： HUANG Yao TANG Yong YUAN Wei FANG GuoYun YANG Yang ZHANG XiaoQing wu yaopeng YUAN YuHang WANG Chun LI JinGuang School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640China

Electric vehicles(EVs)are globally undergoing rapid developments,and have great potentials to replace the traditional vehicles based on fossil ***-type lithium-ion batteries(LIBs)have been widely used for EVs,owing to high power densities,good charge/discharge stability,and long cycle *** driving ranges and acceleration performances are gaining increasing concerns from customers,which depend highly on the power level of *** the increase in power outputs,rising heat generation significantly affects the battery performances,and in particular operation ***,the cold-start performance is still an intractable problem under extreme *** challenges put forward higher requirements for a dedicated battery thermal management system(BTMS).Compared to traditional BTMSs in EVs,the heat pipe-based BTMS has great application prospects owing to its compact structure,flexibility,low cost,and especially high thermal *** this topic,this review first introduces heat generation phenomena and temperature characteristics of *** abuse conditions and thermal runaway issues are described *** cooling and preheating methods for designing a BTMS are also *** emphasis on this review is put on the use of various heat pipes for BTMSs to enhance the thermal performances of *** lack of wide application in actual EVs,more efforts should be made to extend the use of heat pipes for constructing an energy-efficient,cost-effective,and reliable BTMS to improve the performances and safety of EVs.

关键词： lithium-ion power battery heat pipe battery thermal management system thermal performance thermal design thermal runaway

Direct mask-free fabrication of patterned hierarchical graphene electrode for on-chip micro-supercapacitors

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Journal of Materials Science & Technology 2023年第12期143卷 12-19页

作者： yaopeng wu Jinghong Chen Wei Yuan Xiaoqing Zhang Shigen Bai Yu Chen Bote Zhao Xuyang wu Chun Wang Honglin Huang Yong Tang Zhenping Wan Shiwei Zhang Yingxi Xie School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China Intelligent Perception Institute Zhejiang LabHangzhou 311100China School of Environment and Energy South China University of TechnologyGuangzhou 510006China

Graphene-based electrodes with rational structural design have shown extraordinary prospect for en-hanced electrical double-layer capacitance of micro-supercapacitors(MSCs).Herein,a facile fabrication method for flexible planar MSCs based on hierarchical graphene was demonstrated by using a laser-treated membrane for electrode patterning,complemented with hierarchical electrode configuration tak-ing full advantages of size-determined functional *** in-plane interdigital shape of MSCs was defined through vacuum filtration with the assistance of the functionalized polypropylene(PP)*** hierarchical graphene films were built by macroscopic assembly based on size effect of differ-ent lateral sized graphene sheets(rGO-LSL).The sample of MSCs based on rGO-L SL(MSCs-LSL)exhibited excellent volumetric capacitance of 6.7 F cm^(−3) and high energy density of 0.37 mWh cm−*** MSCs-LSL presented superb flexibility and cycling stability with no capacitance deteroriated after 2000 *** newly developed fabrication strategy is of good scalability and designability to manufacture flexible elec-trode for MSCs with customized shapes,while the construction of hierarchical graphene can enlighten the structural design of analogous two-dimensional materials for potential advanced electronics.

关键词： On-chip micro-supercapacitors Mask-free fabrication Macroscopic assembly Patterned graphene film Hierarchical structure

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直接空冷体系挡风墙体型系数研究

西安建筑科技大学学报（自然科学版） 2014年第6期46卷 805-809页

作者：吴耀鹏白国良西安建筑科技大学土木工程学院陕西西安710055

空冷凝汽器是我国大型火力发电厂采用的新型冷却水装置.以国内某大型火电厂直接空冷体系为原形,应用Fluent软件建立数值模型,研究并确定挡风墙的体型系数,并将数值结果与试验结果进行对比分析.结果表明,数值结果与试验结果较接近,变化... 详细信息

空冷凝汽器是我国大型火力发电厂采用的新型冷却水装置.以国内某大型火电厂直接空冷体系为原形,应用Fluent软件建立数值模型,研究并确定挡风墙的体型系数,并将数值结果与试验结果进行对比分析.结果表明,数值结果与试验结果较接近,变化趋势相同,基本满足工程要求.另外,研究表明设置挡风墙是直接空冷体系有效的防风措施,且挡风墙越高散热越有利.研究结果可以为直接空冷体系的抗风设计提供依据和参考.

关键词：直接空冷体系体型系数挡风墙数值模拟

大掺量粉煤灰再生混凝土高温后的抗冲击性能与抗渗性研究

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建筑结构学报 2022年第4期43卷 124-133页

作者：吴耀鹏姜磊张旭王永辉西安建筑科技大学土木工程学院陕西西安710055

粉煤灰再生混凝土的工程应用具有重要的经济效益和社会效益,但若遭受高温作用,其力学性能和耐久性将有显著降低。通过高温试验、抗冲击试验和抗氯离子渗透试验,研究了粉煤灰掺量(0%、10%、20%、30%、40%、50%)、温度(20、200、400、600... 详细信息

粉煤灰再生混凝土的工程应用具有重要的经济效益和社会效益,但若遭受高温作用,其力学性能和耐久性将有显著降低。通过高温试验、抗冲击试验和抗氯离子渗透试验,研究了粉煤灰掺量(0%、10%、20%、30%、40%、50%)、温度(20、200、400、600℃)和静置时长(0、90 d)对再生混凝土抗冲击性能及抗氯离子渗透性能的影响。结果表明:随着温度和粉煤灰掺量的增加,初裂和终裂的冲击次数逐渐减少。200℃高温后混凝土的抗冲击性能明显下降,其初裂的冲击次数仅为常温混凝土的30%~50%,终裂的冲击次数为常温混凝土的40%~46%。在相同温度下,随着粉煤灰掺量的增加,混凝土的抗氯离子渗透能力增强,并且增加静置时长可大幅增加经历高温后的混凝土抗氯离子渗透能力。常温时,20%和50%粉煤灰掺量混凝土的电通量分别比未掺粉煤灰混凝土的电通量降低44.4%、51.6%。经400℃高温并静置90 d后,混凝土的电通量值比未静置的混凝土降低20%~42%。

关键词：再生混凝土粉煤灰高温抗冲击性能抗氯离子渗透性

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含刚性斜杆的平面有侧移刚架内力计算

力学与实践 2021年第4期43卷 613-616页

作者：吴耀鹏邓远航郭昕西安建筑科技大学土木工程学院西安710055 西安建筑科技大学国家级土木工程实验教学示范中心西安710055

在结构分析中,为简化计算常假定结构体系中某些杆件或杆件沿某个方向为无限刚性,含刚性杆结构的内力分析是结构力学的教学难点。在位移法教学中常涉及有侧移刚架,若刚架中含斜杆和刚性杆件,杆端位移将受到限制,结构体系中必有非独立结... 详细信息

在结构分析中,为简化计算常假定结构体系中某些杆件或杆件沿某个方向为无限刚性,含刚性杆结构的内力分析是结构力学的教学难点。在位移法教学中常涉及有侧移刚架,若刚架中含斜杆和刚性杆件,杆端位移将受到限制,结构体系中必有非独立结点位移出现。本文通过引入刚架中刚性约束的约束方程,获得约束方程的系数矩阵,根据系数矩阵秩的计算确定结构体系的基本未知量。并根据约束方程确定结构体系非独立结点位移与独立结点位移间的关系式,应用位移法分析刚架内力。

关键词：刚性杆斜杆有侧移刚架

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超高速钨合金长杆弹侵彻花岗岩靶的毁伤效应

土木工程学报 2024年第11期57卷 81-91页

作者：吴耀鹏李嘉樾钱秉文张伟邢泽晖西安建筑科技大学陕西西安710055 西北核技术研究院陕西西安710024

为研究钨合金长杆弹超高速侵彻花岗岩靶的毁伤规律,文章选用长径比为10∶1的钨合金长杆弹,应用二级轻气炮平台开展弹体在1.6~3.85km/s弹速下的侵彻花岗岩靶的试验,并基于LS-DYNA软件对超高速侵彻过程进行数值模拟。结果表明:(1)不同弹... 详细信息

为研究钨合金长杆弹超高速侵彻花岗岩靶的毁伤规律,文章选用长径比为10∶1的钨合金长杆弹,应用二级轻气炮平台开展弹体在1.6~3.85km/s弹速下的侵彻花岗岩靶的试验,并基于LS-DYNA软件对超高速侵彻过程进行数值模拟。结果表明:(1)不同弹速下花岗岩靶的成坑模式不同,在相对低速(1.6~1.8km/s)时,呈现两边高中间低的“漏斗形”,在相对高速(1.99km/s及以上)时,呈现中间高两边低的“蘑菇头形”,且弹速越高,蘑菇头越扁平;(2)侵彻深度与弹速呈现“上升—下降—上升”的三段式非正比例形态,在1.99km/s后出现侵彻逆减现象,直到2.32km/s后侵彻深度再次随弹速增加而增加;(3)不同弹速下的裂纹数量和最大裂纹长度随弹速的增加而增加,并不受侵彻机制转变的影响。研究结果可为动能弹打击地下工事花岗岩掩体提供参考,具有十分重要的工程价值。

关键词：侵彻超高速毁伤效应钨合金长杆弹花岗岩

典型受火方式下型钢混凝土异形柱耐火极限研究

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钢结构 2017年第11期32卷 117-122页

作者：吴耀鹏张旭李晓蕾西安建筑科技大学土木工程学院西安710055

应用有限元软件ABAQUS建立型钢混凝土柱数值模型,研究4种典型受火方式下SRC异形柱的耐火性能,探讨各因素对SRC异形柱耐火极限的影响。结果表明:矩形柱耐火性能优于异形柱;对于任意截面的SRC柱,耐火极限均随荷载比的增大而减小,且矩形和L... 详细信息

应用有限元软件ABAQUS建立型钢混凝土柱数值模型,研究4种典型受火方式下SRC异形柱的耐火性能,探讨各因素对SRC异形柱耐火极限的影响。结果表明:矩形柱耐火性能优于异形柱;对于任意截面的SRC柱,耐火极限均随荷载比的增大而减小,且矩形和L形SRC柱在高荷载比时下降更多;荷载比较小时L形柱的耐火性能优于T形柱,荷载比较大时T形柱的耐火性能优于L形柱;实腹式配钢SRC柱的耐火性能优于空腹式。研究结果可为SRC异形柱的抗火设计提供依据和参考。

关键词：型钢混凝土异形柱受火方式耐火极限