Supercapacitors - Theoretical and Practical Solutions最新文献

Toward High-Voltage/Energy Symmetric Supercapacitors via Interface Engineering 基于界面工程的高压/能量对称超级电容器

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2018-06-27 DOI: 10.5772/INTECHOPEN.73131

Ya-Qin Wang, Guoxin Zhang

引用次数: 3

Direct Laser Writing of Supercapacitors 超级电容器的直接激光写入

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2018-06-27 DOI: 10.5772/INTECHOPEN.73000

L. Thekkekara

引用次数: 1

Supercapacitor-Based Hybrid Energy Harvesting for Low-Voltage System 基于超级电容器的低压系统混合能量收集

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2018-06-27 DOI: 10.5772/INTECHOPEN.71565

S. Khan, R. Rajkumar, Wong YeeWan, A. Syed

引用次数: 2

Enhancing Pseudocapacitive Process for Energy Storage Devices: Analyzing the Charge Transport Using Electro-kinetic Study and Numerical Modeling 增强储能器件的赝电容过程:利用电动力学研究和数值模拟分析电荷输运

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2018-06-27 DOI: 10.5772/INTECHOPEN.73680

Fenghua Guo, N. Gupta, Xiaowei Teng

{"title":"Enhancing Pseudocapacitive Process for Energy Storage Devices: Analyzing the Charge Transport Using Electro-kinetic Study and Numerical Modeling","authors":"Fenghua Guo, N. Gupta, Xiaowei Teng","doi":"10.5772/INTECHOPEN.73680","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.73680","url":null,"abstract":"Supercapacitors are a class of energy storage devices that store energy by either ionic adsorption via an electrochemical double layer capacitive process or fast surface redox reaction via a pseudocapacitive process. Supercapacitors display fast charging and discharging performance and excellent chemical stability, which fill the gap between high energy density batteries and high-power-density electrostatic capacitors. In this book chapter, the authors have presented the current studies on improving the capacitive storage capacity of various electrode materials for supercapacitors, mainly focusing on the metal oxide electrode materials. In particular, the approaches that mathematically simulate the behavior of interaction between electrode materials and charge carriers subject to potentiodynamic conditions (e.g., cyclic voltammetry) have been described. These include a general relationship between current and voltage to describe overall electrokinetics during the charge transfer process and a more comprehensive numerical modeling that studies ionic transport and electrokinetics within a spherical solid particle. The two aforementioned types of mathematical analyses can provide fundamental understanding of the parameters governing the electrode reaction and mass transfer in the electrode material, and thus shed light on how to improve the storage capacity of supercapacitors.","PeriodicalId":369044,"journal":{"name":"Supercapacitors - Theoretical and Practical Solutions","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121430414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Classical Density Functional Theory Insights for Supercapacitors 经典密度泛函理论对超级电容器的见解

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2018-06-27 DOI: 10.5772/INTECHOPEN.76339

Cheng Lian, Honglai Liu

{"title":"Classical Density Functional Theory Insights for Supercapacitors","authors":"Cheng Lian, Honglai Liu","doi":"10.5772/INTECHOPEN.76339","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.76339","url":null,"abstract":"The most urgent issue for supercapacitor is to improve their energy density so that they can better compete with batteries. To design materials and interfaces for supercapacitor with higher energy density requires a deeper understanding of the factors and contributions affecting the total capacitance. In our recent works, the classical density functional theory (CDFT) was developed and applied to study the electrode/electrolyte interface behaviors, to understand capacitive energy storage. For porous electrode materials, we studied the pore size effect, curvature effect, and the surface modification of porous materials on the capaci- tance. Thought CDFT, we have found that the curvature effects on convex and concave EDLs are drastically different and that materials with extensive convex surfaces will lead to maximized capacitance; CDFT also predicts oscillatory variation of capacitance with pore size, but the oscillatory behavior is magnified as the curvature increases; an increase in the ionophobicity of the nanopores leads to a higher capacity for energy storage, and a pore-like impurity can enter the pore, makes the pore ionophobic and storage more energy. We also find the mixture effect, which makes more counterions pack on and more co-ions leave from the electrode surface, leads to an increase of the counterion density within the EDL and thus a larger capacitance.","PeriodicalId":369044,"journal":{"name":"Supercapacitors - Theoretical and Practical Solutions","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124948683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Ionic Liquid for High Voltage Supercapacitor 高压超级电容器用离子液体

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2018-06-27 DOI: 10.5772/INTECHOPEN.73053

Jeeyoung Yoo

{"title":"Ionic Liquid for High Voltage Supercapacitor","authors":"Jeeyoung Yoo","doi":"10.5772/INTECHOPEN.73053","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.73053","url":null,"abstract":"Pure ionic liquids (ILs) and IL mixtures in organic solvents have been investigated for higher operating voltages around 3.0–4.0 V. ILs have design flexibility due to the numerous possible combinations of anions and cations. Current research on ILs as electrolytes has focused on several ILs, including imidazolium and pyrrolidinium. At early stages, various ILs have been studied as salts of electrolyte with organic solvents like acetonitrile and propylene carbonate. Neat ILs have been applied for high-performance electrolyte, and some of them have been used as electrolyte (1-ethyl 3-methylimidazolium tetrafluoroborate). These liquid electrolytes need additional encapsulation; therefore, SCs applied ILs face difficulty in integration and manufacturing flexible devices. These drawbacks can be solved by adopting a polymer electrolyte because the ILs maintain the conductivity even when solidified, unlike a typical organic electrolyte. Common polymer matrixes such as PVdF, PMMA, and PVA have been suggested to embed ILs. Poly(ionic liquid) (PIL) is also studied. PIL is a polymer electrolyte containing a polymer backbone and an IL species in the monomer repeat unit. PIL-based polymer electrolytes have high ionic conductivity, wide electrochemical windows, and high thermal stability.","PeriodicalId":369044,"journal":{"name":"Supercapacitors - Theoretical and Practical Solutions","volume":"4 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128975052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Performance of Aqueous Ion Solution/Tube-Super Dielectric Material-Based Capacitors as a Function of Discharge Time 基于水离子溶液/管-超级介电材料的电容器性能与放电时间的关系

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71003

S. Lombardo, J. Phillips

{"title":"Performance of Aqueous Ion Solution/Tube-Super Dielectric Material-Based Capacitors as a Function of Discharge Time","authors":"S. Lombardo, J. Phillips","doi":"10.5772/INTECHOPEN.71003","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.71003","url":null,"abstract":"The discharge time dependence of key parameters of electrostatic capacitors employing a dielectric composed of the oxide film formed on titanium via anodization, saturated with various aqueous ion solutions, that is tube-super dielectric materials (T-SDM), was thoroughly documented for the first time. The capacitance, dielectric constant, and energy density of novel paradigm supercapacitors (NPS) based on T-SDM saturated with various concentrations of NaNO 3 , NH 4 Cl, or KOH were all found to roll-off with decreasing dis- charge time in a fashion well described by simple power law relations. In contrast, power density, also well described by a simple power law, was found to increase with decreasing discharge time, in fact nearly reaching 100 W/cm 3 for both 30 wt% KOH and NaNO 3 solu-tion-based capacitors at 0.01 s, excellent performance for pulsed power. For all capacitors, the dielectric constant was tested, which was greater than 10 5 for discharge times >0.01 s, confirming the materials are in fact T-SDM. The energy density for most of the capacitors was greater than 80 J/cm 3 of dielectric at a discharge time of 100 s, once again demonstrating that these capacitors are competitive for energy storage not only with existing com- mercial supercapacitors but also with the best prototype carbon-based supercapacitors.","PeriodicalId":369044,"journal":{"name":"Supercapacitors - Theoretical and Practical Solutions","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129629234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Electrochemical Capacitor Performance: Influence of Aqueous Electrolytes 电化学电容器性能:水性电解质的影响

Supercapacitors - Theoretical and Practical Solutions Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.70694

R. Ramachandran, Fei Wang

引用次数: 44