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Polymer electrolyte

Yipeng Sun, Yang Zhao, Jiwei Wang, Jianneng Liang, Changhong Wang, Qian Sun, Xiaoting Lin, Keegan R Adair, Jing Luo, Dawei Wang, Ruying Li, Mei Cai, Tsun-Kong Sham, Xueliang Sun
Metallic Li is considered as one of the most promising anode materials for next-generation batteries due to its high theoretical capacity and low electrochemical potential. However, its commercialization has been impeded by the severe safety issues associated with Li-dendrite growth. Non-uniform Li-ion flux on the Li-metal surface and the formation of unstable solid electrolyte interphase (SEI) during the Li plating/stripping process lead to the growth of dendritic and mossy Li structures that deteriorate the cycling performance and can cause short-circuits...
December 5, 2018: Advanced Materials
Weidong Zhou, Zhaoxu Wang, Yuan Pu, Yutao Li, Sen Xin, Xiaofang Li, Jianfeng Chen, John B Goodenough
No single polymer or liquid electrolyte has a large enough energy gap between the empty and occupied electronic states for both dendrite-free plating of a lithium-metal anode and a Li+ extraction from an oxide host cathode without electrolyte oxidation in a high-voltage cell during the charge process. Therefore, a double-layer polymer electrolyte is investigated, in which one polymer provides dendrite-free plating of a Li-metal anode and the other allows a Li+ extraction from an oxide host cathode without oxidation of the electrolyte in a 4 V cell over a stable charge/discharge cycling at 65 °C; a poly(ethylene oxide) polymer contacts the lithium-metal anode and a poly(N-methyl-malonic amide) contacts the cathode...
December 5, 2018: Advanced Materials
Stephen Munoz, Steven Greenbaum
Current and future demands for increasing the energy density of batteries without sacrificing safety has led to intensive worldwide research on all solid state Li-based batteries. Given the physical limitations on inorganic ceramic or glassy solid electrolytes, development of polymer electrolytes continues to be a high priority. This brief review covers several recent alternative approaches to polymer electrolytes based solely on poly(ethylene oxide) (PEO) and the use of nuclear magnetic resonance (NMR) to elucidate structure and ion transport properties in these materials...
November 30, 2018: Membranes
Yao Huang, Yanyan Gong, Jingchun Tang, Siyu Xia
A novel thiol-functionalized graphene oxide/Fe-Mn (SGO/Fe-Mn) was investigated for aqueous Hg2+ and CH3 Hg+ removal. Mercury were removed mainly through ligand exchange and surface complexation with surface active sites (i.e., -SH, OH, OCO, CC, SiO, and ππ bond). SH had the strongest binding ability with mercury, forming sulfur-containing organic matter or polymers with Hg2+ , and sulfur-containing organometallic compounds or thiolate-like species with CH3 Hg+ . The BET sorption isotherm model well simulated the sorption isotherm data of Hg2+ (R2 =0...
November 18, 2018: Journal of Hazardous Materials
Robert K Thomas, Jeffrey Penfold
A full comparison of results from binding isotherms and surface tension (ST) measurements on polyelectrolyte (PE)-surfactant (S) mixtures, especially the polymer dependence, shows up clear distinctions between the behaviour of two representative PE-S systems, poly(sodium styrenesulfonate) (NaPSS) with dodecyltrimethylammonium bromide (C12 TAB) and poly(dimethyl-diallyl-ammonium chloride) (PDMDAAC) with sodium dodecylsulfate (SDS) in 100 mM NaCl. The surfactant-monomer binding constant in NaPSS-C12 TAB is an order of magnitude greater than that in the PDMDAAC-SDS system...
December 4, 2018: Journal of Physical Chemistry. B
V Parameswaran, E R Nagarajan
Solid polymer blend electrolytes are widely studied due to their extensive applications particularly in electrochemical devices. Blending polymer electrolytes make thermal stability and higher mechanical strength and enhance the ionic conductivity while incorporate inorganic salt. In these studies, 50% polyvinyl alcohol (PVA), 50% poly(N-vinyl pyrrolidone) (PVP) and 10% ammonium bromide (NH₄Br) doped with different molecular weight percentage (M.Wt.%) of cobalt sulfide nanoparticles (CoS-NPs) as nano filler is synthesized using solution casting technique...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Jingjing Ma, Guangri Xu, Yuanchao Li, Chuangye Ge, Xiaobo Li
An in situ chemically and physically confined sulfur-polymer composite (denoted as SPANI) is synthesized by sulfurizing PANI through a one-step thermal treatment. The SPANI cathode exhibits excellent cycling stability in commercial carbonate-based electrolytes. It offers a new insight into sulfur cathode design for high performance Li-S batteries.
November 29, 2018: Chemical Communications: Chem Comm
Onnuri Kim, Kyoungwook Kim, U Hyeok Choi, Moon Jeong Park
The synthesis of high-conductivity solid-state electrolyte materials with eliminated polarization loss is a great challenge. Here we show a promising potential of single-ion block copolymers with crystalline protogenic channels as efficient proton conductors. Through the self-organization of zwitterion, imidazole, and polystyrene sulfonate with controlled dipolar interactions therein, the distance between neighboring proton donors and acceptors in ionic crystals, as well as the dipolar orientation in nanoscale ionic phases was precisely tuned...
November 28, 2018: Nature Communications
Wonjun Jang, Hyun A Cho, Kyungwho Choi, Yong Tae Park
Recently, with the miniaturization of electronic devices, problems with regard to the size and capacity of batteries have arisen. Energy harvesting is receiving significant attention to solve these problems. In particular, the thermoelectric generator (TEG) is being studied for its ability to harvest waste heat energy. However, studies on organic TEGs conducted thus far have mostly used conductive polymers, making the application range of TEGs relatively narrow. In this study, we fabricated organic TEGs using carbonaceous nanomaterials (i...
November 28, 2018: Micromachines
Ali Ehsani, Ali Akbar Heidari, Hamid Mohammad Shiri
This review gives an overview of the synthesis, surface and electrochemical investigations over ternary nanocomposite of conductive polymers in the development of new supercapacitors. They utilize both Faradaic and non-Faradaic procedures to store charge, leading to higher specific capacitance and energy density, higher cell voltage, longer life cycle and moderated power density. Owing to a unique combination of features such as superb electrical conductivity, corrosion resistance in aqueous electrolytes, highly modifiable nanostructures, long cycle life and the large theoretical specific-surface area, the use of ternary nanocomposites as a supercapacitor electrode material has become the focus of a significant amount of current scientific researches in the field of energy storage devices...
November 27, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Shaoyang Wang, Fei Li, Alexandra D Easley, Jodie L Lutkenhaus
Organic radical polymers for batteries represent some of the fastest-charging redox active materials available. Electron transport and charge storage must be accompanied by ion transport and doping for charge neutrality, but the nature of this process in organic radical polymers is not well understood. This is difficult to intuitively predict because the pendant radical group distinguishes organic radical polymers from conjugated, charged or polar polymers. Here we show for the first time a quantitative view of in situ ion transport and doping in organic radical polymers during the redox process...
November 26, 2018: Nature Materials
Andr Eacute Olean-Oliveira, Tiago Olean-Oliveira, Ana Moreno, Patricia Seraphim, Marcos Teixeira
In the present study, a chemiresistor sensor based on a poly (Bismarck Brown Y)-reduced graphene oxide nanocomposite was developed to analyze the respiratory capacity of the constituent complexes of the electron transport chain. The sensorial platform was characterized using electrochemical impedance spectroscopy, and oxygen detection was accomplished by measuring the resistive properties of the sensor at fixed AC frequency. The impedance decreased significantly in response to small variations of the O2 concentrations tested up to saturation of the electrolyte solution with molecular oxygen...
November 26, 2018: ACS Sensors
Sujin Yoon, Taewook Ryu, Kyungchul Kim, Sabuj Sutradhar Chandra, Faiz Ahmed, Hanmo Yang, Seungchan Lee, Jaewoong Kim, Whangi Kim
Polymer containing isatin was synthesized by super acid-catalyzed carbon-carbon coupling reaction. Propylsulfonic acid was grafted on isatin unit by substitution reaction with potassium salt of 3-bromo-1-propanesulfonic acid. The sulfonic acid composition was regulated at 25~80 mol% of propylsulfonic acid in order to achieve expected ion exchange capacity of maximum 2.0 meq/g. The copolymers were of high molecular weight (inherent viscosity, η inh = 1.2 dL/g) to afford a tough membrane by solution casting...
March 1, 2019: Journal of Nanoscience and Nanotechnology
Quan Pang, Laidong Zhou, Linda F Nazar
Lithium metal batteries are capable of revolutionizing the battery marketplace for electrical vehicles, owing to the high capacity and low voltage offered by Li metal. Current exploitation of Li metal electrodes, however, is plagued by their exhaustive parasitic reactions with liquid electrolytes and dendritic growth, which pose concerns to both cell performance and safety. We demonstrate that a hybrid membrane, both elastic and Li+ -ion percolating, can stabilize Li plating/stripping with high Coulombic efficiency...
November 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
Bo Zhang, Min Chen, Changbin Zhang, Hong He
An all-solid cell with a solid polymer electrolyte was applied to electrochemical oxidation of low-concentration indoor gaseous aromatic pollution. Antimony-doped tin dioxide nanocoatings deposited on a titanium foam substrate (Ti/Sb-SnO2 ) with different Sb/Sn ratios (4.8-14.0 mol%) and loading weight of Sb-SnO2 (4.4-7.7 mg cm- 2 ) were used as dimensionally stable anodes. Sn and Sb were homogeneously dispersed on the substrate, and a crack-free nanocoating was built when the loading of nanocoating was increased to 6...
November 10, 2018: Chemosphere
Pradeep Kumar, Yahya E Choonara, Lisa C du Toit, Neha Singh, Viness Pillay
This study aimed to develop a prolonged-release device for the potential site-specific delivery of a neuroprotective agent (nicotine). The device was formulated as a novel reinforced crosslinked composite polymeric system with the potential for intrastriatal implantation in Parkinson's disease interventions. Polymers with biocompatible and bioerodible characteristics were selected to incorporate nicotine within electrolyte-crosslinked alginate-hydroxyethylcellulose gelispheres compressed within a release rate-modulating external polymeric matrix, comprising either hydroxypropylmethylcellulose (HPMC), polyethylene oxide (PEO), or poly(lactic- co -glycolic) acid (PLGA) to prolong nicotine release...
November 15, 2018: Pharmaceutics
Yinghui Shang, Junjie Wei, Chu Wu, Qigang Wang
Polymer gel electrolytes (PGEs) have been considered as one of the most promising candidates to solve safety and flexibility issues in wearable devices. To supply energy for the daily-used epidermal electronic systems, biaxial stretchability and temperature tolerance are essential for energy storage units. However, the limited choices of PGEs, including fragile poly(vinyl alcohol) and uniaxial stretchable polyacrylamide hydrogel, lag far behind the requirement of wearable supercapacitors. Herein, an adhesive organohydrogel with a water/ethylene glycol binary solvent is tailored as the electrolyte of an all-climate, biaxially stretchable pseudocapacitor...
November 30, 2018: ACS Applied Materials & Interfaces
Mohammadjavad Eslamian, Martin Antensteiner, Mohammad Reza Abidian
Nanostructured Conducting polymer (CP) actuators are promising materials for biomedical applications such as drug release systems. However, understanding the actuation behavior at the nano-scale has not yet been explored. In this work, poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(pyrrole) (PPy) nanotubes doped with a large counter ion (i.e. poly(styrene sodium sulfonate) (PSS)) were fabricated using electrochemical deposition of PEDOT and PPy around poly(L-lactide) (PLLA) nanofiber templates, followed by template removal in chloroform...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Yun Ling, Xiatian Zhuang, Zheng Xu, Yunchao Xie, Xiaoyu Zhu, Yadong Xu, Bohan Sun, Jian Lin, Yihui Zhang, Zheng Yan
Three-dimensional (3D) cellular graphene structures have wide applications in energy storage, catalysis, polymer composites, electromagnetic shielding, and many others. However, the current strategies to form cellular graphene are only able to realize limited structure control and are hard to achieve the construction of 3D hierarchical architectures with complex, programmed configurations, limiting the design capabilities to satisfy various next-generation device applications. In addition, cellular graphene usually exhibits limited electromechanical properties, and its electrical and electrochemical performances are dramatically affected by mechanical deformations, constraining its applications in emerging wearable electronics and energy devices...
November 19, 2018: ACS Nano
Xian-Zong Wang, Hong Luo, Triratna Muneshwar, Hong-Qiang Fan, Ken Cadien, Jing-Li Luo
Developing a corrosion-resistant and electrically conductive coating on metallic bipolar plates is essential to mitigate the performance degradation induced by the high cathodic transient potentials (CTPs) in the start-up/shut-down (SU/SD) processes of polymer electrolyte membrane fuel cells (PEMFCs). Herein, a zirconium oxynitride (Zr2 N2 O) coating prepared by atomic layer deposition was used to improve the corrosion resistance of 304 stainless steel (304 SS) toward anodic dissolution at various CTPs. Triangular potential pulses were applied to the specimens to simulate potential variations at the cathode side of the PEMFCs at SU/SD stages...
November 21, 2018: ACS Applied Materials & Interfaces
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