Article
Chemistry, Physical
Tomoki Omori, Masahiro Nakanishi, Daisuke Tashima
Summary: The study found that at high temperatures, the impedance of the capacitors increased while the capacitance decreased, leading to rapid degradation. Residual voltage was identified as a key factor influencing this rapid degradation.
Article
Chemistry, Physical
L. Koeps, F. A. Kreth, A. Bothe, A. Balducci
Summary: This manuscript explores the application of 1,1-dimethylpyrrolidinium tetrafluoroborate as a conducting salt for EDLCs, demonstrating increased performance and stability of the capacitors.
ENERGY STORAGE MATERIALS
(2022)
Article
Electrochemistry
Anis Allagui, Mohammed E. Fouda
Summary: This study explores the computation of capacitance from time-domain data, utilizing definitions of capacitance and frequency-domain data analysis. Experimental results demonstrate the effectiveness of the capacitance calculation method in different scenarios.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Chemical
Yi-Han Su, Chun-Yan Shih, Chi-huai Su, Yuh-Lang Lee, Chien-Te Hsieh, Hsisheng Teng
Summary: The study develops a gel polymer electrolyte with graphene oxide (GO)-decorated polymer blend, which exhibits low flammability and high ionic conductivity under harsh conditions. Compared to conventional capacitors, the electrolyte shows improved capacitance, rate capability, and cycling stability. The research also demonstrates excellent performance of the capacitor at extreme temperatures due to the dissociation of solvent-ion clusters and low dielectric loss.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Physical
Cheng-Chia Chen, Fu-Ming Sutarsis, Jagabandhu Patra, Fu-Ming Wang, Jeng-Yu Lin, Quan-Feng Dong, Yu-Sheng Su, Jeng-Kuei Chang
Summary: Self-discharge is a crucial issue for supercapacitors, which results in voltage depression and limits their charge storage performance. A cost-effective and facile strategy for addressing self-discharge is developed in this work. It is found that self-discharge is closely associated with the pore size distribution of activated carbon electrodes, and this can be controlled by the binder type. The effects of binder selection on the self-discharge and reliability of supercapacitors are investigated.
Article
Chemistry, Physical
Yu Zhang, Lianming Zhao, Xuyang Wang, Xiaoning Wang, Honglin Li, Han Hu, Zhuangjun Fan, Wei Xing, Zifeng Yan
Summary: By modifying the carbon surface with fluorine-containing functional groups, the voltage window of EDLC can be increased, leading to improved cycling stability and energy density.
Article
Energy & Fuels
Masatoshi Uno, Ziyan Lin, Kakeru Koyama
Summary: This study investigated the voltage variation of electric double-layer capacitor (EDLC) modules and proposed a novel reconfigurable EDLC module with cell voltage equalization capability to improve energy utilization ratio.
Article
Chemistry, Multidisciplinary
Songming Yang, Youer Deng, Shiqi Zhou
Summary: The aim of this paper is to investigate the possible use of the dipole dimer water model in describing the electrical double layer capacitor capacitance behaviors. It is confirmed that the dipole dimer water model enables the reproduction of various experimental phenomena, such as the negative correlation between capacitance and temperature, insensitivity to electrolyte concentration, and the shape of the capacitance-voltage curve. The paper emphasizes the indispensable role of the electric dipole in reproducing the confirmed capacitance behaviors and highlights the potential of the dipole dimer water model.
Article
Chemistry, Multidisciplinary
Ju-Hwan Kim, Hye-Min Lee, Sang-Chul Jung, Dong-Chul Chung, Byung-Joo Kim
Summary: A mesoporous activated carbon (PB-AC) was prepared from bamboo, with modifications using phosphoric acid and steam activation to tune the crystal structure and pore characteristics. The PB-AC exhibited high specific surface area and mesopore-rich nature, making it a suitable electrode material for EDLCs.
Article
Chemistry, Physical
Muhammad Hamza, Jingyu Li, Wentao Zhang, Zhengxing Zuo, Ridong Liao, Bing-Ang Mei
Summary: This study proposes a multi-scale electrochemical thermal model for Electric Double Layer Capacitors (EDLCs) to study the heat generation and temperature profiles. The model predicts well with experimental results and can be used to investigate the effect of nanoparticle phenomena on commercial EDLC devices.
JOURNAL OF POWER SOURCES
(2022)
Article
Forestry
Nutthira Pakkang, Shiori Suzuki, Kengo Shigetomi, Yasumitsu Uraki
Summary: This study aimed to assemble a high-performance electric double-layer capacitor (EDLC) using a hardwood kraft lignin (HKL)-based separator and HKL-based electrodes. Different approaches were used to fabricate the electrodes, resulting in EDLCs with high energy and power densities.
Review
Chemistry, Physical
Jinjue Zeng, Chenyang Xu, Tian Gao, Xiangfen Jiang, Xue-Bin Wang
Summary: This review discusses the integration of two-dimensional nanosheets into three-dimensional porous monoliths, creating 3D graphene structures that prevent aggregation or restacking of individual graphene sheets and provide pathways for electron/phonon transport and mass transfer. The synthesis methodology and applications of 3D graphene for electric double-layer capacitors are highlighted, along with current challenges and future prospects for manufacturing and application.
Article
Chemistry, Physical
Hyeonji Jang, Yeon Hu Park, Min-Ha Kim, Jungmok You, Jae-Heung Ko, Jung Tae Lee
Summary: Studies have shown that by altering the chemical composition of biomass, it is possible to increase the surface area and oxygen functional groups of porous carbon materials, thereby improving their electrochemical performance.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Keiko Ideta, Doo-Won Kim, Taegon Kim, Koji Nakabayashi, Jin Miyawaki, Joo-Il Park, Seong-Ho Yoon
Summary: The study investigated the effect of pore size on the response characteristic of an electric double layer capacitor (EDLC), and found that samples with the largest pore size showed superior capacitance and response frequency characteristics. The presence of micropores and mesopores in the activated carbon facilitated low electrolyte-diffusion resistance during the formation of the electric double layer, leading to fast and stable response frequency.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Thermodynamics
Yeongcheol Park, Jaehoon Kim, Changho Kim, Seung-Mo Lee, Chul Kang, Jae Hun Seol
Summary: The thermal properties of aqueous electric double layer capacitors (EDLCs) with KOH electrolytes were measured and monitored during charge and discharge operations. The results showed that the voltage and KOH concentration have significant effects on the effective heat capacity of the electrodes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Thuy Duong Pham, Abdullah Bin Faheem, So Yeon Chun, Jung-Rae Rho, Kyungwon Kwak, Kyung-Koo Lee
Summary: This study shows the potential for enhancing the performance of lithium metal batteries (LMBs) by modulating the ion solvation structures in the electrolyte through mixing different salts. A highly promising electrolyte system with improved conductivity, Coulombic efficiency, and stability of solid-electrolyte interface layer is proposed, offering a new avenue towards commercial LMBs.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Abdullah Bin Faheem, Jong-Yun Kim, Sang-Eun Bae, Kyung-Koo Lee
Summary: This study presents an automated fitting method for van der Waals parameters based on genetic algorithm, which can fit all terms simultaneously without manual intervention. Successfully applied to solvents like acetonitrile, it can reproduce various properties accurately at different temperatures.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Thuy Duong Pham, Abdullah Bin Faheem, Kyung-Koo Lee
Summary: A highly concentrated LiFSI-THF electrolyte system has been introduced, allowing for high CE cycling of lithium metal anodes without dendrite growth. The excellent charge-discharge performance is attributed to the increased cation-anion associated complexes in the electrolyte.
Article
Chemistry, Multidisciplinary
Thuy Duong Pham, Abdullah Bin Faheem, Junam Kim, Hye Min Oh, Kyung-Koo Lee
Summary: This study develops a high concentration electrolyte (HCE) that effectively suppresses dendrites and enhances stability in Li metal batteries. The HCE shows good performance under high current density and has potential for applications in high-voltage Li metal batteries and anode-free batteries.
Article
Chemistry, Multidisciplinary
Asmat Ullah, Keun Hyeong Park, YoungWan Lee, Sujung Park, Abdullah Bin Faheem, Hieu Dinh Nguyen, Yasir Siddique, Kyung-Koo Lee, Yimhyun Jo, Chi-Hwan Han, SeJin Ahn, Inyoung Jeong, Shinuk Cho, BongSoo Kim, Young S. Park, Sungjun Hong
Summary: Inverted perovskite solar cells offer advantages such as easy processing and high stability, but face challenges in achieving high power conversion efficiency. This study introduces excellent hole-selective materials for inverted PSCs and demonstrates the potential of engineered self-assembled monolayers (SAMs) in achieving high-performance solar cells. The Se-containing SAM shows the strongest interaction with the perovskite absorber and achieves a PCE of 22.73%.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Abdullah Bin Faheem, Kyung-Koo Lee
Summary: In the field of green energy production, molten salts have gained significant attention over the last few decades. Classical molecular dynamics (CMD) is a useful method for discovering and optimizing desirable molten salts, but the absence of CMD force fields that can accurately reproduce experimental physical properties poses a challenge. In this study, non-polarizable rigid ion models (RIMs) for widely used LiCl, KCl, and LiCl-KCl molten salts were developed using genetic algorithms (GAs). The results show that GAs are effective in optimizing force field parameters and the developed RIM force fields can reasonably reproduce experimental physical properties, providing microstructural characteristics similar to first-principles MD and improved overall performance at a lower computational cost. The developed atomwise RIM force fields with mixing rules for interactions between ions of different types reduce the total number of optimizable terms and enable transferability between different molten salt systems.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Hoai Van Thi Nguyen, Abdullah Bin Faheem, Junam Kim, Juyeoung Lee, Qing Jin, Bonyong Koo, Woong Kim, Kyung-Koo Lee
Summary: Finding a viable electrolyte is crucial for developing high power and energy densities supercapacitors. In this study, we synthesized a conducting salt, tetramethylphosphonium tetrafluoroborate (TMPBF4), and compared its electrochemical characteristics with 1,1-dimethylpyrrolidinium tetrafluoroborate (DMPBF4). The results showed that supercapacitors with TMPBF4 exhibited lower capacitance at low current density but higher capacitance at high current density, providing insights for designing electrolytes for supercapacitors.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jae-ik Lee, Abdullah Bin Faheem, Won Joon Jang, Kyung Mi Kim, Jin Seong Cha, Noh-Uk Seo, Hansung Kim, Kyung-Koo Lee, Jung Hoon Yang
Summary: This study provides a clear definition of state-of-charge (SoC) in zinc-polyiodide flow batteries (ZIFB) based on thermodynamic relationships. It also proposes two effective strategies to extend the maximum SoC. By adding triethylene glycol (tri-EG) to the electrolyte, the formation constant of I-3(-) can be increased, and higher-order polyiodides such as I-5(-) can be promoted, resulting in a significant enhancement of the maximum attainable SoC. This SoC extension effect is confirmed in ZIFB flow cells with stable charge-discharge cycling.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Thuy Duong Pham, Abdullah Bin Faheem, Junam Kim, Kyungwon Kwak, Kyung-Koo Lee
Summary: A sulfite-based electrolyte has been proposed to inhibit the growth of lithium dendrites and improve the Coulombic efficiency and stability of lithium metal batteries. Molecular dynamics simulations have revealed a direct correlation between the proportion of cation-anion complexes and the contact angle between the electrolyte and separator. This study presents an effective approach to enhance lithium metal batteries with sulfite-based electrolytes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Electrochemistry
Thuy Duong Pham, Abdullah Bin Faheem, Junam Kim, Kyungwon Kwak, Kyung-Koo Lee
Summary: Non-flammable electrolyte (NF-LiNO3/GBL) consisting of LiNO3 in gamma-butyrolactone (GBL) with flame retardant and SEI/CEI-forming additives was proposed. It was found that the NF-LiNO3/GBL electrolyte can form SEI/CEI layers rich in conductive inorganic species, enhancing the interfacial stability at the anode/cathode. The Li||Cu cells using NF-LiNO3/GBL electrolyte exhibited a high Coulombic efficiency of 98.3% and Li||LiNi0.6-Co0.2Mn0.2O2 (4.3 V) cell maintained excellent capacity retention of 90% after 200 cycles.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Hoai Van Thi Nguyen, Abdullah Bin Faheem, Junam Kim, Juyeoung Lee, Qing Jin, Bonyong Koo, Woong Kim, Kyung-Koo Lee
Summary: Finding a viable electrolyte is crucial for developing supercapacitors with high power and energy densities. The study compared the electrochemical characteristics of supercapacitor devices containing two different salts and found that the salt with smaller ions and solvation shells showed higher capacitance at high current density, indicating its potential for high power applications.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Electrochemistry
Hieu Dinh Nguyen, Thuy Duong Duong Pham, Abdullah Bin Faheem, Hye Min Oh, Kyung-Koo Lee
Summary: This study introduces a novel electrolyte that improves the performance of high-voltage Li metal batteries. The electrolyte exhibits excellent stability and effectively protects both electrodes, leading to a high capacity retention during long-term cycling.
BATTERIES & SUPERCAPS
(2023)
Article
Chemistry, Physical
Thuy Duong Pham, Abdullah Bin Faheem, Hieu Dinh Nguyen, Hye Min Oh, Kyung-Koo Lee
Summary: In this work, a low concentration bisalt electrolyte is proposed for practical Li-metal batteries, which can provide stable and conductive solid/cathode electrolyte interphase layers. The electrolyte improves safety, coulombic efficiency, and suppresses lithium dendrite growth. The results demonstrate the benefits of this electrolyte for the industrial application of Li-metal batteries.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Tianyu Chen, Zhibin Lu, Guangjin Zeng, Yongmin Xie, Jie Xiao, Zhifeng Xu
Summary: The study introduces a high-performance LSGM electrolyte-supported tubular DC-SOFC stack for portable applications, which shows great potential in developing into high-performing, efficient, and environmentally friendly portable power sources for distributed applications.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Wenbin Tong, Yili Chen, Shijie Gong, Shaokun Zhu, Jie Tian, Jiaqian Qin, Wenyong Chen, Shuanghong Chen
Summary: In this study, a three-dimensional porous NiO interface layer with enhanced anode dynamics is fabricated, forming a Schottky contact with the zinc substrate, allowing rapid and uniform zinc plating both inside and below the interface layer. The resulting NiO@Zn exhibits exceptional stability and high capacity retention.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yafeng Bai, Kaidi Li, Liying Wang, Yang Gao, Xuesong Li, Xijia Yang, Wei Lu
Summary: In this study, a flexible zinc ion supercapacitor with gel electrolytes, porous alpha-MnO2@reduced graphene oxide cathode, and activated carbon/carbon cloth anode was developed. The device exhibits excellent electrochemical performance and stability, even at low temperatures, with a high cycle retention rate after 5000 cycles.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Anmol Jnawali, Matt D. R. Kok, Francesco Iacoviello, Daniel J. L. Brett, Paul R. Shearing
Summary: This article presents the results of a systematic study on the electrochemical performance and mechanical changes in two types of commercial batteries with different anode chemistry. The study reveals that the swelling of anode layers in batteries with silicon-based components causes deformations in the jelly roll structure, but the presence of a small percentage of silicon does not significantly impact the cycling performance of the cells within the relevant state-of-health range for electric vehicles (EVs). The research suggests that there is room for improving the cell capacities by increasing the silicon loading in composite anodes to meet the increasing demands on EVs.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yohandys A. Zulueta, My Phuong Pham-Ho, Minh Tho Nguyen
Summary: Advanced atomistic simulations were used to study ion transport in the Na- and K-doped lithium disilicate Li2Si2O5. The results showed that Na and K doping significantly enhanced Li ion diffusion and conduction in the material.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Zongying Han, Hui Dong, Yanru Yang, Hao Yu, Zhibin Yang
Summary: An efficient phase inversion-impregnation approach is developed to fabricate BaO-decorated Ni8 mol% YSZ anode-supported tubular solid oxide fuel cells (SOFCs) with anti-coking properties. BaO nanoislands are successfully introduced inside the Ni-YSZ anode, leading to higher peak power densities and improved stability in methane fuel. Density functional theory calculations suggest that the loading of BaO nanoislands facilitates carbon elimination by capturing and dissociating H2O molecules to generate OH.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Suresh Mamidi, Dan Na, Baeksang Yoon, Henu Sharma, Anil D. Pathak, Kisor Kumar Sahu, Dae Young Lee, Cheul-Ro Lee, Inseok Seo
Summary: Li-CO2 batteries, which utilize CO2 and have a high energy density, are hindered in practical applications due to slow kinetics and safety hazards. This study introduces a stable and highly conductive ceramic-based solid electrolyte and a metal-organic framework catalyst to improve the safety and performance of Li-CO2 batteries. The optimized Li-CO2 cell shows outstanding specific capacity and cycle life, and the post-cycling analysis reveals the degradation mechanism of the electrodes. First-principles calculations based on density functional theory are also performed to understand the interactions between the catalyst and the host electrode. This research demonstrates the potential of MOF cathode catalyst for stable operation in Li-CO2 batteries.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Ganghua Xiang, Zhihuan Qiu, Huilong Fei, Zhigang Liu, Shuangfeng Yin, Yuen Wu
Summary: In this study, a CeFeOx-supported Pt single atoms and subnanometric clusters catalyst was developed, which exhibits enhanced catalytic activity and stability for the preferential oxidation of CO in H2-rich stream through synergistic effect.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Dimitrios Chatzogiannakis, Marcus Fehse, Maria Angeles Cabanero, Natalia Romano, Ashley Black, Damien Saurel, M. Rosa Palacin, Montse Casas-Cabanas
Summary: By coupling electrochemical testing to operando synchrotron based X-ray absorption and powder diffraction experiments, blended positive electrodes consisting of LiMn2O4 spinel (LMO) and layered LiNi0.5Mn0.3Co0.2O2 (NMC) were studied to understand their redox mechanism. It was found that blending NMC with LMO can enhance energy density at high rates, with the blend containing 25% LMO showing the best performance. Testing with a special electrochemical setup revealed that the effective current load on each blend component can vary significantly from the nominal rate and also changes with SoC. Operando studies allowed monitoring of the oxidation state evolution and changes in crystal structure, in line with the expected behavior of individual components considering their electrochemical current loads.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Chiara Cementon, Daniel Dewar, Thrinathreddy Ramireddy, Michael Brennan, Alexey M. Glushenkov
Summary: This Perspective discusses the specific power and power density of lithium-ion capacitors, highlighting the fact that their power characteristics are often underestimated. Through analysis, it is found that lithium-ion capacitors can usually achieve power densities superior to electrochemical supercapacitors, making them excellent alternatives to supercapacitors.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Weihao Wang, Hao Yu, Li Ma, Youquan Zhang, Yuejiao Chen, Libao Chen, Guichao Kuang, Liangjun Zhou, Weifeng Wei
Summary: This study achieved an improved electrolyte with excellent low-temperature and high-voltage performance by regulating the Li+ solvation structure and highly concentrating it. The electrolyte exhibited outstanding oxidation potential and high ionic conductivity under low temperature and high voltage conditions, providing a promising approach for the practical application of high-voltage LIBs.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Martin Bures, Dan Gotz, Jiri Charvat, Milos Svoboda, Jaromir Pocedic, Juraj Kosek, Alexandr Zubov, Petr Mazur
Summary: Vanadium redox flow battery is a promising energy storage solution with long-term durability, non-flammability, and high overall efficiency. Researchers have developed a mathematical model to simulate the charge-discharge cycling of the battery, and found that hydraulic connection of electrolyte tanks is the most effective strategy to reduce capacity losses, achieving a 69% reduction.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
M. Rodriguez-Gomez, J. Campo, A. Orera, F. de La Fuente, J. Valenciano, H. Fricke, D. S. Hussey, Y. Chen, D. Yu, K. An, A. Larrea
Summary: In this study, we analysed the operando performance of industrial lead cells using neutron diffraction experiments. The experiments revealed the evolution of different phases in the positive electrode, showed significant inhomogeneity of phase distribution inside the electrode, and estimated the energy efficiency of the cells.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Jiawei Liu, Chenpeng Wang, Yue Yao, Hao Ye, Yinglong Liu, Yingli Liu, Xiaoru Xu, Zhicong Chen, Huazheng Yang, Gang Wu, Libin Lei, Chao Wang, Bo Liang
Summary: The study focuses on utilizing double conductive Ni-pads as anode collectors in micro-tubular solid oxide fuel cells. The simulation results show excellent performance and stability of DCNPs, and also highlight the potential applications in various fields.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yang Wang, Kangjie Zhou, Lang Cui, Jiabing Mei, Shengnan Li, Le Li, Wei Fan, Longsheng Zhang, Tianxi Liu
Summary: This study presents a polyimide sandwiched separator (s-PIF) for improving the cycling stability of Li-metal batteries. The s-PIF separator exhibits superior mechanical property, electrolyte adsorption/retention and ion conductivity, and enables dendrite-free Li plating/stripping process.
JOURNAL OF POWER SOURCES
(2024)
