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double-kill contribution of high-roughness high-density porous carbon electrodes to mechanically self-sensing supercapacitors

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Nano Research 2024年第7期17卷 6157-6167页

作者： Jue Huang Pengyu Liu Yiqun Wang Keren Dai qingyun dou Yajiang Yin Xiaofeng Wang Zheng You Department of Precision Instrument Tsinghua UniversityBeijing 100084China State Key Laboratory of Precision Measurement Technology and Instruments Beijing 100084China Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China ZNDY of Ministerial Key Laboratory School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing 210094China Qiyuan Laboratory Beijing 100095China

Impact detecting and counting are fundamental functions of fuses used in hard target penetration ***,detection failure caused by battery breakdown in high-g acceleration environments poses a vulnerability for such *** paper introduces a novel supercapacitor that combines energy storage and high-g impact detection,called self-sensing *** deliberately inducing a transient soft short-circuit during shock in the supercapacitor,it is possible to detect external impact by its transient voltage *** realize this concept,firstly,by introducing the contact theory and force-induced percolation model,the electrode strength and roughness are found to have key impacts on the formation of soft ***,to meet the needs for sensitivity and capacity,a high-density porous carbon(HDPC)that combines high mechanical strength and porosity,is selected as a suitable candidate based on the analysis ***,a two-step curing method is proposed to prepare the high-roughness HDPC(HRHDPC)electrode and to assemble the self-sensing *** to the rich specific surface of the electrodes and the high surface strength and roughness conducive to the formation of transient soft short circuits,the self-sensing supercapacitor not only possesses an excellent specific capacitance(171 F/g at 0.5 A/g)but also generates significant voltage response signals when subjected to high-g impacts ranging from 8000g to 31,***,the self-sensing supercapacitor is applied to compose a successive high-g impact counting system and compared to traditional solutions(sensors and tantalum capacitors)in the military *** results show that the self-sensing supercapacitor-based system exhibits advantages in terms of size,power consumption,and counting accuracy.

关键词： supercapacitor self-sensing soft short-circuit impact sensing

Flexible planar micro supercapacitor diode

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Journal of Energy Chemistry 2024年第6期93卷 429-435,I0011页

作者： Yihui Ma Pei Tang Zhenyuan Miao Wuyang Tan Qijun Wang Yuecong Chen Guosheng Li qingyun dou Xingbin Yan Lingling Shui Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and Engineering&South China Academy of Advanced OptoelectronicsGuangzhou 510006GuangdongChina Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275GuangdongChina College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004GuangxiChina

Supercapacitor diode is a novel ion device that performs both supercapacitor energy storage and ion diode rectification ***,previously reported devices are limited by their large size and complex *** this work,we demonstrate a screen-printed micro supercapacitor diode(MCAPode)that based on the insertion of a finger mode with spinel ZnCo_(2)O_(4) as cathode and activated carbon as anode for the first time,and featuring an excellent area specific capacitance(1.21 mF cm^(-2)at 10 mV s^(-1))and high rectification characteristics(rectification ratioⅠof 11.99 at 40 mV s^(-1)).Taking advantage of the ionic gel electrolyte,which provides excellent stability during repeated flexing and at high *** addition,MCAPode exhibits excellent electrochemical performance and rectification capability in"AND"and"OR"logic *** findings provide practical solutions for future expansion of micro supercapacitor diode applications.

关键词： Micro devices Supercapacitor diodes Screen-printing Rectification Logic gates

Establishing a new testing protocol of the electrochemical stability window for electric double-layer capacitors

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Science China Chemistry 2024年

作者： Ruilin Hou Xiaoxi Zhao Tingting Liang qingyun dou Shan Xu Xingbin Yan School of Materials Science and Engineering Sun Yat-sen University Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences College of Engineering and Applied Sciences Nanjing University Center of Industrial Analysis and Testing Guangdong Academy of Science

The electrochemical stability window (ESW) is crucial for determining the energy density of electric double-layer capacitors(EDLCs).However,current ESW testing protocols of EDLCs are strongly affected by artificial factors,thereby leading to unreliable *** solve this problem,we first identify the key shortcomings of the traditional protocols by analyzing their test ***,taking an aqueous carbon-based EDLC as an example,we design a side reaction descriptor to represent the response difference in the charging capacitance to side reactions between the cyclic voltammetry and galvanostatic chargedischarge *** the aid of this descriptor,we propose a new ESW testing protocol,which is not only able to completely avoid the adverse influence of subjective factors but also fully consider the operating condition *** protocol can be extended from the single electrode to the full *** work proposes a more rigorous definition of ESW and provides a reliable protocol for evaluating the ESW of EDLCs.

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超级电容器电解液的离子调控

科学通报 2024年第20期69卷 2910-2922页

作者：景鹏玮窦青云阎兴斌中山大学材料科学与工程学院广州510006 中国科学院兰州化学物理研究所兰州730000

与二次电池相比,超级电容器具有充/放电速度快、功率密度高和循环寿命长的特点,但实际应用受限于较低的能量密度.电解液作为超级电容器的重要组成部分,对其进行设计开发有助于推动超级电容器以性能和功能为导向的应用.本文从电解液离子... 详细信息

与二次电池相比,超级电容器具有充/放电速度快、功率密度高和循环寿命长的特点,但实际应用受限于较低的能量密度.电解液作为超级电容器的重要组成部分,对其进行设计开发有助于推动超级电容器以性能和功能为导向的应用.本文从电解液离子调控的角度出发,讨论了超级电容器的储能机制阐释、电化学性能提升和新颖功能开发.首先讨论了电解液离子对双电层电容材料和赝电容材料电化学行为的影响.接着从工作电压和比容量角度讨论了提升超级电容器能量密度的策略,包括拓宽电解液的电化学稳定窗口、充分利用有效电压范围、合理匹配离子尺寸与材料结构、引入额外法拉第贡献,以及促进溶剂化离子的体相传输和界面去溶剂化动力学等.然后,介绍了功能型超级电容器,重点讨论了超级电容器二极管的研究进展.最后,提出了我们对该领域当前挑战和未来方向的看法.

关键词：超级电容器电解液离子调控储能机制能量密度超级电容器二极管

Perspective on High-Energy Carbon-Based Supercapacitors

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Energy & Environmental Materials 2020年第3期3卷 286-305页

作者： qingyun dou Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea

Supercapacitors based on carbon materials have advantages such as high power density,fast charging/discharging capability,and long lifetime stability,playing a vital role in the field of electrochemical energy storage *** further expand the practical applications of carbon-based supercapacitors,their energy density,which is essentially determined by the specific capacitance and operating voltage,should be *** review provides fundamental knowledge on achieving high energy density of *** first address the relationship of the features of carbon materials,such as the surface area,pore size distribution,and surface functional groups,with their electrochemical performances,such as the gravimetric and volumetric capacitance,surface pseudocapacitance,and operating ***,we discuss the properties of electrolytes from nonaqueous and aqueous to hybrid one from the thermodynamic and kinetic aspects,and present their effects on capacitance and operating ***,we illustrate different cell design strategies and their basic principles for increasing operating *** also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.

关键词： carbon material cell design electrolyte energy density supercapacitors

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基于序列混合整数凸优化的变体导弹轨迹规划

战术导弹技术 2024年第4期 53-63页

作者：窦青赟王研李雅轩刘新福北京理工大学宇航学院北京100081

针对变后掠角导弹俯冲段的轨迹规划问题,提出一种基于序列混合整数凸优化的轨迹规划方法。提出使用升阻力系数可达集代替攻角约束、后掠角约束和气动代理模型作为导弹控制约束,避免在轨迹规划问题中直接处理强非线性的气动代理模型。注... 详细信息

针对变后掠角导弹俯冲段的轨迹规划问题,提出一种基于序列混合整数凸优化的轨迹规划方法。提出使用升阻力系数可达集代替攻角约束、后掠角约束和气动代理模型作为导弹控制约束,避免在轨迹规划问题中直接处理强非线性的气动代理模型。注意到可达集由两个区域组成,这使其无法被简单的解析函数描述,故提出使用整数变量来表征对可达集区域的选择,将升阻力系数可达集约束转换成解析的形式。建立变体导弹轨迹规划的最优控制问题,通过重新设计控制量、部分线性化、凹凸分解等方法将其转化为仅含凸约束的最优控制问题,并使用序列混合整数凸优化算法对该问题进行求解。仿真结果表明,提出的算法能可靠地求解出严格满足各类约束的最优飞行轨迹,且变体导弹的终端速度相较于标准构型导弹显著提升。

关键词：变体导弹轨迹规划最优控制序列凸优化混合整数规划凹凸分解控制分配

Bifunctional fluoropyridinium-based cationic electrolyte additive for dendrite-free Li metal anode

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Nano Research 2023年第7期16卷 9530-9537页

作者： Kunyao Peng Pei Tang Qianqian Yao qingyun dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China

Although lithium metal has become a promising anode material for high-energy batteries owing to its high specific capacity and the lowest reduction potential,the continuous side reactions with electrolyte as well as the safety problem caused by Li dendrite growth restrict Li anode’s practical ***,we demonstrate that N-fluoropyridinium(ArF^(+))bis(trifluoromethane)sulfonimide(TFSI-)as an electrolyte additive can protect the lithium metal by both solid electrolyte interphase(SEI)protection and electrostatic repulsion *** ArF+cations not only participate in forming F,Ncontaining SEI protective layer on Li surface,but also act as a cationic repellent during Li deposition to inhibit Li dendrite *** a result,the cycle performance of Li symmetric cells and Li||LiFePO_(4)full cells were significantly improved by using ArFTFSIadded *** study provides an electrolyte additive strategy for Li anode realizing SEI protection and electrostatic repulsion simultaneously.

关键词： lithium metal anode electrolyte additive solid electrolyte interphase(SEI) electrostatic repulsion lithium metal battery(LMB)

Two-Dimensional Pseudocapacitive Nanomaterials for High-Energy-and High-Power-Oriented Applications of Supercapacitors

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Accounts of Materials Research 2021年第2期2卷 86-96页

作者： Puritut Nakhanivej qingyun dou Peixun Xiong Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan UniversitySuwon-siGyeonggi-do 440-746Republic of Korea School of Chemical Engineering College of Engineering and SKKU Advanced Institute of Nanotechnology(SAINT)College of Engineering

CONSPECTUS:Supercapacitors(SCs)are electrochemical energy storage devices that can fill the gap between batteries and electrolytic ***,the widespread applications of commercialized carbon-based SCs are limited by their energy density,arising from their physical charge storage mechanism,which is by far lower than that of ***,the highpowered applications of SCs are also limited by their kinetics,which are slower than those of electrolytic capacitor due to the diffusion and distribution of ions onto the tortuous porous ***,the energy and power performance of SCs need to be improved to open or further extend their practical *** all atoms of two-dimensional(2D)nanomaterials are located on the surface,the design of surface structure is critical to determining the bulk electrochemical *** a surface-oriented property of 2D nanomaterials is well fitted to control the surface charge storage mechanism of SCs,thereby discovering emerging capacitive materials through the rational design of surface chemistry and multiscale *** Account discusses our recent progress on 2D pseudocapacitive materials for high-energyand high-power-oriented SCs applications and provides our perspective into the rational design of the microstructure,multiscale architecture,and surface *** of 2D nanomaterials include heteroatom-doped graphene,black phosphorus,transition-metal dichalcogenides,and transition-metal carbide/nitrides(MXene).We also highlight the in-depth spectroelectrochemical and computational analyses that can correlate the structures and chemistries of 2D nanomaterials with their charge storage/transport/transfer *** this Account,our design concept of 2D nanomaterials is based on two aspects of charge storage capability and kinetics that can determine the thermodynamic(capacitance)and kinetic(rate)***,chemical strategies,such as atomic incorporation,surface functionaliz

关键词： carbide microstructure kinetics

Understanding Pseudocapacitance Mechanisms by Synchrotron X-ray Analytical Techniques

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Energy & Environmental Materials 2023年第4期6卷 312-331页

作者： Pei Tang Wuyang Tan Guangyang Deng Yunting Zhang Shan Xu Qijun Wang Guosheng Li Jian Zhu qingyun dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China Center of Industrial Analysis and Testing Guangdong Academy of ScienceGuangzhou 510651China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China

Pseudocapacitive materials that store charges via reversible surface or near-surface faradaic reactions are capable of overcoming the capacity limitations of electrical double-layer *** the structure–activity relationship between the microstructural features of pseudocapacitive materials and their electrochemical performance on the atomic scale is the key to build high-performance capacitor-type devices containing ideal pseudocapacitance ***,the high brightness(flux),and spectral and coherent nature of synchrotron X-ray analytical techniques make it a powerful tool for probing the structure–property relationship of pseudocapacitive ***,we report a comprehensive and systematic review of four typical characterization techniques(synchrotron X-ray diffraction,pair distribution function[PDF]analysis,soft X-ray absorption spectroscopy,and hard X-ray absorption spectroscopy)for the study of pseudocapacitance *** addition,we offered significant insights for understanding and identifying pseudocapacitance mechanisms(surface redox pseudocapacitance,intercalation pseudocapacitance,and the extrinsic pseudocapacitance phenomenon in battery materials)by combining in situ hard XAS and electrochemical ***,a perspective for further depth of understanding into the pseudocapacitance mechanism using synchrotron X-ray analytical techniques is proposed.

关键词： in situ experiments pseudocapacitive materials structure-property relationship synchrotron X-ray analytical techniques