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零伏存储对钠离子电池衰退行为的性能影响

电源技术 2024年第7期48卷 1318-1326页

作者：陆雨晗温浩伟杨斌乔志军阮殿波宁波大学机械工程与力学学院浙江宁波315211 宁波大学先进储能技术与装备研究院浙江宁波315211 合盛新能(宁波)科技有限公司浙江宁波315040

储能安全对推动国民经济有重要支撑作用,钠离子电池因钠资源丰富、低成本以及高安全性等优势成为目前储能技术的研究热点。重点介绍了零伏存储后钠离子电池的稳定性,并通过电化学性能分析、物化特性分析的方法探究了零伏存储时间对钠离... 详细信息

储能安全对推动国民经济有重要支撑作用,钠离子电池因钠资源丰富、低成本以及高安全性等优势成为目前储能技术的研究热点。重点介绍了零伏存储后钠离子电池的稳定性,并通过电化学性能分析、物化特性分析的方法探究了零伏存储时间对钠离子电池和锂离子电池的影响以及衰减机理的差异性。实验结果表明:零伏存储后的钠离子电池容量可恢复性较强,在零伏存储120 d后达到了98.66%,但钠离子电池的Rs增加显著,最大变化率达到4595.89%,并且正极活性物质结构也受到了一定程度的损伤,最终导致钠离子电池寿命衰减。相较于锂离子电池,钠离子电池具有较好的零伏稳定性。

关键词：钠离子电池锂离子电池零伏存储稳定性衰减机理

Structural Changes of Activated Carbon Electrodes for EDLCs in the Manufacturing Process

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Transactions of Tianjin University 2020年第5期26卷 391-398页

作者： Bin Yang dianbo ruan Yang Zhang Chengyang Wang Zhijun Qiao Key Laboratory for Green Chemical Technology of MOE School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Institute of Supercapacitor Ningbo CRRC New Energy Technology Co.LtdNingbo 315112China Faculty of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315112China

Supercapacitors,or electric double-layer capacitors(EDLCs),are the new generation of energy storage devices to store electrical charges and provide high power densities and long cyclic life compared to other storage *** mainly consists of activated carbon electrodes and an electrolyte,and the performance of EDLC depends on the activated carbon *** this work,the structural changes of activated carbon electrodes are analyzed using commercial 2.7 V/9500F EDLCs in its manufacturing *** is found that there is no significant change in morphology and crystal structure of the activated carbon,but its specific surface area(SSA)reduced *** SSA of activated carbon was decreased by 23%after they were manufactured or converted into electrodes and finally retained only 40%of SSA after the capacitance ***,the SSA of the positive electrodes was found to decrease critically than that of the negative *** SSA of the external positive electrodes is only 14.3%after fl oating test at 65℃.

关键词： Electrode EDLCs Pore structure Activated carbon Structural change

Regulating charge heterogeneity of lithium-ion battery via tab design toward maximizing extreme fast-charging performance

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Progress in Natural Science:Materials International 2023年第5期33卷 660-667页

作者： Jun Yang Yuzuo Wang Yanqing Hu Dengfeng Liu Bin Yang dianbo ruan Zhijun Qiao Faculty of Mechanical Engineering and Mechanics Ningbo University Institute of Advanced Energy Storage Technology and Equipment Ningbo University Hesheng Alternative Energy Technology Co. Ltd.

Construction of high-throughput electrical transmission structure via tab design is an effective way of developing high-power lithium-ion batteries(LIBs). In this paper, five types of 18650-cylindrical LIBs with different tab structures were prepared to analyze the mechanism of the effects of tab structure on battery performance,including internal resistance, C-rate performance, thermal and cycle. Research showed that the number of tabs and position were important factors, which strongly decided the internal resistance of battery. By adjusting tab structure, an extremely fast charging performance surpassing 10C can be achieved. Besides, the battery showed excellent cycle stability of more than 3000 cycles at 6C, which was proved to be due to optimizing the Li-ion concentration distribution of electrodes. The work also emphasized that excessive tabs contributed to no significant improvement in electrochemical performances at normal charging/discharging rates(<1C) for 18650 *** relationship between the operation conditions and tab design is established to further guide the manufacturing.

关键词： High-power lithium-ion batteries Tab structure Tabless electrolyte potential

Revisiting Electrolyte Kinetics Differences in Sodium Ion Battery:Are Esters Really Inferior to Ethers?

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Energy & Environmental Materials 2023年第4期6卷 203-210页

作者： Lei Yan Guifang Zhang Jing Wang Qingjuan Ren Linlin Fan Binhua Liu Yujia Wang Wenhua Lei dianbo ruan Qingyin Zhang Zhiqiang Shi Tianjin Key Laboratory of Advanced Fibers and Energy Storage School of Materials Science and EngineeringTiangong UniversityTianjin 300387China Institute of Advanced Energy Storage Technology and Equipment Ningbo UniversityNingbo Zhejiang 315211China School of Chemical Engineering and Technology Tiangong UniversityTianjin 300387China

The ether electrolytes usually outperform ester electrolytes by evaluating sodium-ion batteries(SIBs)rate performance,which is a near-unanimous conclusion of previous studies based on an essential configuration of the half-cell ***,here we find that contrary to consensus,the ester electrolyte shows better Na storage capability than the ether electrolyte in full *** in-depth analysis of three-electrode,symmetric cell,and in situ XRD tests indicates that traditional half-cell test results are unreliable due to interference from Na *** particular,Na electrodes show a huge stability difference in ester and ether electrolytes,and ester electrolytes suffer more severe interference than ether electrolytes,resulting in the belief that esters are far inferior to ether *** seriously,the more accurate three-electrode test would also suffer from Na electrode ***,a“corrected half-cell test”protocol is developed to shield the Na electrode interference,revealing the very close super rate capability of hard carbon in ester and ether *** work breaks the inherent perception that the kinetic properties of ester electrolytes are inferior to ethers in sodium-ion batteries,reveals the pitfalls of half-cell tests,and proposes a new test protocol for reliable results,greatly accelerating the commercialization of sodium-ion batteries.

关键词： corrected half-cell test electrolyte kinetic data hard carbon Na electrode interference sodium-ion batteries

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超临界工况下水在换热表面传热特性研究进展

徐州工程学院学报（自然科学版） 2024年第2期39卷 9-17页

作者：任潞周浩杰殷晶晶丁降雪阮殿波所新坤宁波大学机械工程与力学学院浙江宁波315100 徐州工程学院电气与控制工程学院江苏徐州221018

对于超临界水传热特性的研究,自21世纪初以来呈快速增长的态势发展.该文总结了近年来国内外学者对于超临界水换热性能的研究,系统分析了浮升力、壁面热流密度、质量流速、压力等因素对其流动换热特性的影响.众多结果表明:浮升效应引起... 详细信息

对于超临界水传热特性的研究,自21世纪初以来呈快速增长的态势发展.该文总结了近年来国内外学者对于超临界水换热性能的研究,系统分析了浮升力、壁面热流密度、质量流速、压力等因素对其流动换热特性的影响.众多结果表明:浮升效应引起的剪切应力和径向流速的变化会导致传热恶化;通过减小热流密度,提高质量流速能有效改善传热.目前研究中给出了超临界水一般传热关系式,但其适用精度还需进一步提升.

关键词：超临界水换热浮升力热流密度质量流速

Stress-assisted design of stiffened graphene electrode structure toward compact energy storage

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Journal of Energy Chemistry 2022年第8期31卷 478-487,I0013页

作者： Yuzuo Wang Jing Chen Huasong Qin Ke Chen Zhuangnan Li Yan Chen Juan Li Tianzhao Hu Shaorui Chen Zhijun Qiao dianbo ruan Quanhong Yang Yilun Liu Feng Li Ningbo University Institute of Advanced Energy Storage Technology and EquipmentNingbo 315211ZhejiangChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Ningbo CRRC New Energy Technology Co. LtdNingbo 315112ZhejiangChina Laboratory for Multiscale Mechanics and Medical Science School of AerospaceXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Department of Materials Science and Metallurgy University of CambridgeCB30FSUnited Kingdom Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012JilinChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

The low spatial charge-storage density of porous carbons greatly limits volumetric performance in electrochemical *** increase of charge-storage density requires structural refinements to balance the trade-offs between the porosity and density of materials,but the limited mechanical properties of carbons usually fail to withstand effective densifying processes and obtain an ideal pore ***,we design the stiffened graphene of superior bending rigidity,enabling the fine adjustments of pore structure to maximize the volumetric capacitance for the graphene-based *** inplane crumples on graphene sheets are found to contribute largely to the bending rigidity,which is useful to control the structural evolution and maintain sufficient ion-accessible surface area during the assembling *** makes the capacitance of stiffening activated graphene keep 98%when the electrode density increases by 769%to reach 1.13 g cm^(-3) after mechanical pressure,an excellent volumetric energy density of 98.7 Wh L^(-1) in an ionic-liquid electrolyte is *** results demonstrate the role of intrinsic material properties on the performance of carbon-based electrodes for capacitive energy storage.

关键词： Supercapacitor Activated graphene Bending rigidity Volumetric capacitance Pore structure

3D-honeycomb carbons for high performance electrical double layer capacitors electrodes

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储能科学与技术 2016年第4期5卷 527-531页

作者： qiao zhijun ruan dianbo yuan jun fu guansheng yang bin Institute of Supercapacitors Ningbo CRRC New Energy Technology Co.Ltd.Ningbo 315112ZhejiangChina

Sodium fulvic acid based hierarchical porous carbons(SFA-HPCs) with a specific surface area of 1919 m^2·g^(–1) and total volume of 1.7 cm^3·g^(–1) has been synthesized by a simple self-template method. The carbon skeleton can be formatted by the decomposition process of sodium fulvic acid(SFA) in a N_2 atmosphere. The sodium compund in SFA is used as a self-template to create the hierarchical porous structure. The unique hierarchical structure of SFA-HPCs provides an efficient pathway for electrolyte ions to be diffused into the internal surfaces of bulk electrode particles. It results in a high charge storage capacitance of 186 F·g^(–1) at current load of 40 A·g^(–1). The capacitance of 230 F·g^(–1) at 0.05 A·g^(–1) and 186 F·g^(–1) at 40 A·g^(–1) show its good rate capability. Besides, it also achieves desirable cycling stability, 99.4% capacitance remained after 10000 cycles at 40 A·g^(–1).

关键词： sodium fulvic acid hierarchical porous carbons self-template method high rate capability

电化学阴极沉积制备氧化镍/碳纳米管复合电极的准电容特性(英文)

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Chinese Journal of Chemical Physics 2005年第3期18卷 421-427页

作者：王晓峰阮殿波梁吉清华大学精密仪器与机械学系北京100084 清华大学机械系北京100084

采用催化裂解的方法制备了碳纳米管,其比容量为12F/g.采用碳纳米管作为电极基体,采用阴极电化学还原Ni(NO3)2的方法在碳纳米管基体表面均匀的沉积了纳米氧化镍颗粒并由此制备了氧化镍碳纳米管复合电极材料.采用循环伏安、恒流充放电、... 详细信息

采用催化裂解的方法制备了碳纳米管,其比容量为12F/g.采用碳纳米管作为电极基体,采用阴极电化学还原Ni(NO3)2的方法在碳纳米管基体表面均匀的沉积了纳米氧化镍颗粒并由此制备了氧化镍碳纳米管复合电极材料.采用循环伏安、恒流充放电、交流阻抗及扫描电镜等方法考察了复合电极材料的容量特性、阻抗特性、自放电特性以及电极表观特征.实验表明复合电极具有良好的电化学特性,碳纳米管基体在明显降低氧化镍材料的阻抗的同时还提高了电极材料的电化学容量并拓宽了电极材料的有效工作电位窗,复合电极在6mol/LKOH电解液中比容量达到25F/g且表现了良好的电化学可逆性.与碳纳米管基电容器相比,采用氧化镍复合电极材料组装的电容器具有较低的自放电率.

关键词：氧化镍碳纳米管超电容器纳米复合电极阴极沉积

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聚苯胺在电化学电容器中的应用

Chinese Journal of Chemical Physics 2005年第4期18卷 635-640页

作者：王晓峰尤政阮殿波清华大学精密仪器与机械学系北京100084

采用化学氧化聚和法制备了聚苯胺电极材料,所制备的聚苯胺具有高于420F/g的法拉第赝电容和良好的电化学特性.分别采用聚苯胺作为正极材料,高比容量活性碳作为负极,38%硫酸作为电解液制备了复合型电化学电容器.复合型电容器工作电压达到1... 详细信息

采用化学氧化聚和法制备了聚苯胺电极材料,所制备的聚苯胺具有高于420F/g的法拉第赝电容和良好的电化学特性.分别采用聚苯胺作为正极材料,高比容量活性碳作为负极,38%硫酸作为电解液制备了复合型电化学电容器.复合型电容器工作电压达到1.4V,最大电容器比容量达到57F/g,最大比能量达到15.5Wh/kg.电容器200mA/cm2放电条件下真实功率达到2.8W/g,峰值比功率达到20.4W/g.循环工作寿命超过1000次.

关键词：聚苯胺活性碳复合型电化学电容器赝电容器双电层电容器