Review
Chemistry, Applied
Murilo M. Amaral, Raissa Venancio, Alfredo C. Peterlevitz, Hudson Zanin
Summary: Solid-state and quasi-solid-state electrolytes have gained attention for their advantages in leakage prevention, safety, and flexibility. Quasi-solid-state electrolytes show higher energy and power densities due to better ionic conductivity. Organic quasi-solid-state electrolytes with a working voltage window greater than 2.5 V require more attention, while aqueous-based solid-state electrolytes offer easier handling, greater ionic conductivity, and capacitance. Recent developments in water-in-salt polymer-electrolytes have exhibited stability up to 2 V, encouraging further research in aqueous-based quasi-solid-state electrolytes. These electrolytes have potential application in flexible and bendable devices, promoting advancements in portable electronics and wearables.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Energy & Fuels
Abbas Ali Hor, Neetu Yadav, S. A. Hashmi
Summary: Enhancing interfacial redox activities by introducing a redox-active species in electrolytes is a latest strategy to enhance the performance characteristics of supercapacitors. In this study, an aqueous redox-active gel polymer electrolyte (R-GPE) is synthesized using a redox-active salt (trimethyl-sulfoxonium iodide, TMSI) added into an ionic liquid (1-ethyl-3-methylimidazolium chloride, EMICl), entrapped in a host polymer poly(vinyl alcohol). The R-GPE film exhibits high flexibility and excellent electrochemical properties, making it suitable for supercapacitor applications. Two supercapacitors are fabricated using R-GPE with and without TMSI, respectively, showing significantly improved performance with higher specific capacitance (-613 F g-1) and specific energy (-69 Wh kg-1) compared to the device without TMSI. The R-GPE-based supercapacitor demonstrates a moderate rate capability and good cycling stability.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Jijian Zhang, Jing Li, Danying Zuo, Jin Xu, Hongwei Zhang
Summary: By using a ternary deep eutectic solvent to prepare eutectogels, the problems of carbon-based supercapacitors, such as low operating potential window and energy density, can be addressed. The optimized eutectogels show high ionic conductivity and good stretchability and twistability, making the quasi-solid-state supercapacitors with eutectogels exhibit stable voltage window, high energy density, and excellent cycling stability.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Chemical
Jia Yang, Xiaoyi Hu, Xiaohan Fang, Lidan Fan, Gang Qin, Ziyue Zhang, Jingyi Xu, Ye Liang, Qiang Chen
Summary: A physically cross-linked double network alkaline gel polymer electrolyte (AGPE) membrane based on PVA and kappa-carrageenan was developed for practical application requirements of flexible supercapacitors. The AGPE membrane exhibited improved ionic conductivity and mechanical properties. By introducing a redox-active mediator, the fabricated supercapacitor achieved high electrode specific capacitance and energy density with excellent flexibility and low temperature resistance. This investigation offers a strategy for preparing gel polymer electrolyte membranes with potential applications in flexible, portable, and wearable electronics.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Energy & Fuels
Shrishti Sharma, M. Dinachandra Singh, Anshuman Dalvi
Summary: This study reports the fabrication and characterization of all-solid-state supercapacitors utilizing a conductive filler dispersed solid polymer electrolyte. The research demonstrates that the electrical conductivity of the CSPE membranes is closely related to the EDLC performance, with the LATP content in the membranes playing a crucial role in enhancing capacitance. Additionally, EDLC cells with LATP dispersed CSPE exhibit improved stability during thermal cycling between 40 degrees C and 80 degrees C.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Teja M. Patil, Aravind H. Patil, Mokurala Krishnaiah, Dhananjay Mishra, Ajit Kumar, Niraj Kumar, Vijay D. Chavan, Deok-Kee Kim, Sushant B. Patil, Shivaji B. Sadale, Raviraja T. Patil, Vijay J. Fulari, Sung Hun Jin, Vibhavari P. Malekar
Summary: The addition of a redox additive, potassium ferricyanide, to an aqueous gel electrolyte has been found to improve the electrochemical performance of CuCo2O4 nanowire arrays based solid state symmetric supercapacitors. The addition of potassium ferricyanide significantly increases the areal capacitance and energy density, and the CuCo2O4 exhibits good cyclic stability. These findings demonstrate the promising potential of adding redox substances in aqueous electrolytes for energy storage systems.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Karsimran Singh, Raj Kumar, Amarjeet Kaur
Summary: In this study, citrus limetta pulp-derived activated carbon electrodes were used in high-performance symmetric electrical double-layer capacitors. Different amounts of activating agent (KHCO3) were used to activate dried leftover limetta pulp, resulting in various activated carbons. The structure and porosity of the synthesized activated carbons were characterized, and it was found that adding NH4+-salt significantly improved the electrochemical properties of the gel polymer electrolyte system.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Baek Heon Lim, Ju Min Kim, Van-Tam Nguyen, Hyungi Kim, Chan Won Park, Jae Keun Lee, Chang-Hoon Lee, Jaeseop Yoo, Bok Ki Min, Seong K. Kim
Summary: In this study, an environmentally friendly fluorine-free quasi-solid polymer electrolyte is synthesized and applied in various electrochemical devices, demonstrating high conductivity, optical transparency and mechanical flexibility. The cellulose-based supercapacitor also exhibits excellent stability. This work opens a path to the development of environmentally friendly materials for sustainable applications.
MATERIALS TODAY ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Jia Yang, Mengxiao Wang, Tao Chen, Xiang Yu, Gang Qin, Xiaohan Fang, Xiaoxiang Su, Qiang Chen
Summary: To meet the practical needs of flexible and wearable electronic equipment, a novel multifunctional gel polymer electrolyte (GPE) was developed for supercapacitors, which exhibited toughness, self-healing, and high specific capacitance. The GPE, composed of polyvinyl alcohol (PVA)-sodium alginate (SA)-K-3[Fe(CN)](6)-Na2SO4, utilized K-3[Fe(CN)](6) as a carrier donor, ionic crosslinking agent, and redox-active mediator, effectively balancing the conductivity and mechanical properties. The resulting supercapacitor showed outstanding bending and stretching stabilities, self-healing capability, and anti-freezing properties, making it promising for use in complex service conditions of flexible and wearable electronic equipment.
SCIENCE CHINA-MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yu-Jiao Zhang, Zhen-Yu Xing, Wen-Peng Wang, Ning Gao, Jie Zhao, Wen-Ce Yue, Xue Li, Yi-Bo Gao, Sen Xin, Bao Li, Bao Wang
Summary: Improving the kinetics of sulfur species by decorating Mo2C nanoparticles on carbon nanotubes; using gel polymer electrolytes (GPEs) derived from in situ polymerization of DOL to enhance the stability of Li stripping/plating; obtaining LSBs with higher energy density and improved durability by combining CNT/Mo2C/S cathodes and GPEs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Qifan Liu, Jianhui Qiu, Chao Yang, Limin Zang, Guohong Zhang, Eiichi Sakai, Hong Wu, Shaoyun Guo
Summary: The flexible supercapacitor is a promising energy storage device with high energy density, stable energy supply, interchangeable electrodes, and robust flexibility, demonstrating excellent electrochemical and mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Abbas Ali Hor, Neetu Yadav, S. A. Hashmi
Summary: Introducing redox-active species into the electrolyte component allows for additional pseudocapacitive redox activities at the electrode-electrolyte interfaces, improving the energy density of carbon supercapacitors. In this study, a quasisolid-state supercapacitor was developed using activated carbon electrodes and a redox-active gel polymer electrolyte (R-GPE) incorporated with an ionic liquid and a redox-additive IL, entrapped in a polymer matrix. The R-GPE showed excellent mechanical stability, wide thermal stability range, and high electrochemical properties, making it a promising substitute for liquid electrolytes in supercapacitors. The quasisolid-state supercapacitor demonstrated enhanced specific capacitance, specific energy, and maximum power due to the redox activities at the interfaces. It also exhibited good cycling performance with minimal fading in specific capacitance and high Coulombic efficiency.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Qiyu Wang, Xiangqun Xu, Bo Hong, Maohui Bai, Jie Li, Zhian Zhang, Yanqing Lai
Summary: Quasi-solid-state lithium metal batteries with gel polymer electrolyte exhibit high ionic conductivity and stability towards Li metal anode, allowing for long cycling life with capacity retention. The design of the polymer skeleton provides new insights for solid-state battery optimization different from intrinsic properties of electrolyte, offering new opportunities for practical manufacturing of lithium metal batteries.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Nanoscience & Nanotechnology
Thushani De Silva, Cole Damery, Rana Alkhaldi, Robinson Karunanithy, Dinuka H. Gallaba, Prasanna D. Patil, Milinda Wasala, Poopalasingam Sivakumar, Aldo Migone, Saikat Talapatra
Summary: This study presents the development of all solid-state flexible electrochemical double-layer capacitors using aligned multiwalled carbon nanotubes and a PVA/H3PO4 polymer gel. The devices exhibit high areal specific capacitance and energy density, and can withstand multiple mechanical bending cycles while maintaining stable performance. Various strategies for enhancing capacitive charge storage are also demonstrated, showing promise for robust, stackable, and flexible supercapacitors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Amit Kumar Das, Bhimanaboina Ramulu, Edugulla Girija Shankar, Jae Su Yu
Summary: By employing rational surface engineering, a novel nanostructured CuS@PEDOT hybrid negative electrode was successfully constructed on a flexible conducting carbon cloth (CC) substrate, demonstrating high areal capacity and long-lasting electrochemical cycling stability.
CHEMICAL ENGINEERING JOURNAL
(2022)