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https://www.readbyqxmd.com/read/29045068/coaxial-carbon-mno2-hollow-nanofibers-as-sulfur-hosts-for-high-performance-lithium-sulfur-batteries
#1
Lubin Ni, Ganjin Zhao, Yanting Wang, Zhen Wu, Wei Wang, Yunyun Liao, Guang Yang, Guowang Diao
Lithium-sulfur (Li-S) batteries have recently attracted a large amount of attention as promising candidates for next-generation high-power energy storage devices because of their high theoretical capacity and energy density. However, the shuttle effect of polysulfides and poor conductivity of sulfur are still vital issues that constrain their specific capacity and cyclic stability. Here, we design coaxial MnO2-graphitic carbon hollow nanofibers as sulfur hosts for high-performance lithium-sulfur batteries. The hollow C/MnO2 coaxial nanofibers are synthesized via electrospinning and carbonization of the carbon nanofibers (CNFs), followed by an in situ redox reaction to grow MnO2 nanosheets on the surface of CNFs...
October 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29043341/the-facile-synthesis-of-layered-ti2c-mxene-carbon-nanotube-composite-paper-with-enhanced-electrochemical-properties
#2
Longfei Li, Fen Wang, Jianfeng Zhu, Wenling Wu
Ti2AlC has been investigated for several decades, but much less attention has been paid to its delamination and potential energy storage applications, mainly due to the difficulty of delamination and its oxidation features. Herein, a new path to enhance exfoliation and delamination of two-dimensional (2D) Ti2CTx MXene is used. By using an etchant of HCl + LiF, multilayer Ti2CTx is easy to obtain. With only the assistance of mild sonication for 1.5 h without any additional intercalation, two-dimensional (2D) Ti2CTx flake suspensions are produced...
October 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29041441/impact-of-carbon-ion-implantation-on-the-nonlinear-optical-susceptibility-of-linbo3
#3
Kai J Spychala, Gerhard Berth, Alex Widhalm, Michael Rüsing, Lei Wang, Simone Sanna, Artur Zrenner
In this work we study the impact of ion implantation on the nonlinear optical properties in MgO:LiNbO3 via confocal second-harmonic microscopy. In detail, we spatially characterize the nonlinear susceptibility in carbon-ion implanted lithium niobate planar waveguides for different implantation energies and fluences, as well as the effect of annealing. In a further step, a computational simulation is used to calculate the implantation range of carbon-ions and the corresponding defect density distribution. A comparison between the simulation and the experimental data indicates that the depth profile of the second-order effective nonlinear coefficient is directly connected to the defect density that is induced by the ion irradiation...
September 4, 2017: Optics Express
https://www.readbyqxmd.com/read/29039955/critical-role-of-ultrathin-graphene-films-with-tunable-thickness-in-enabling-highly-stable-sodium-metal-anodes
#4
Huan Wang, Chuanlong Wang, Edward Matios, Weiyang Li
Sodium (Na) metal has shown great promise as an anode material for the next-generation energy storage systems owing to its high theoretical capacity, low cost and high earth abundance. However, the extremely high reactivity of Na metal with organic electrolyte leads to the formation of unstable solid electrolyte interphase (SEI) and growth of Na dendrites upon repeated electrochemical stripping/plating, causing poor cycling performance and serious safety issues. Herein, we present highly stable and dendrite-free Na metal anodes over a wide current range and long-term cycling via directly applying free-standing graphene films with tunable thickness on Na metal surface...
October 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29039678/electrochemical-properties-of-sulfurized-polyacrylonitrile-cathode-for-lithium-sulfur-batteries-effect-of-polyacrylic-acid-binder-and-fluoroethylene-carbonate-additive
#5
Hee Min Kim, Jang-Yeon Hwang, Doron Aurbach, Yang-Kook Sun
Sulfurized carbonized polyacrylonitrile (S-CPAN) is a promising cathode material for Li-S batteries owing to the absence of polysulfide dissolution phenomena in the electrolyte solutions and thus the lack of detrimental shuttle mechanism. However, challenges remain in achieving high performance at practical loading because of large volume expansion of S-CPAN electrodes and lithium anodes degradation at high current densities. In order to mitigate this problem, we propose a novel cell design including polyacrylic acid (PAA) binder for improved integrity of the composite electrodes and fluoroethylene carbonate (FEC) as additive in the electrolyte solutions for stabilizing the lithium metal surface...
October 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29035057/freeze-dried-sulfur-graphene-oxide-carbon-nanotube-nano-composite-for-high-sulfur-loading-lithium-sulfur-cells
#6
Yoon Hwa, Hyeon Kook Seo, Jong Min Yuk, Elton J Cairns
The ambient-temperature rechargeable lithium/sulfur (Li/S) cell is a strong candidate for the beyond lithium ion cell, since significant progress on developing advanced sulfur electrodes with high sulfur loading has been made. Here we report on a new sulfur electrode active material consisting of a cetyltrimethylammonium bromide-modified sulfur-graphene oxide-carbon nanotube (S-GO-CTA-CNT) nano-composite prepared by freeze drying. We show the real-time formation of nano-crystalline lithium sulfide (Li2S) at the interface between the S-GO-CTA-CNT nano-composite and the liquid electrolyte by in situ TEM observation of the reaction...
October 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/29035034/ultrasmall-mno-nanoparticles-supported-on-nitrogen-doped-carbon-nanotubes-as-efficient-anode-materials-for-sodium-ion-batteries
#7
Yanzhen He, Ping Xu, Bin Zhang, Yunchen Du, Song Bo, Xijiang Han, Huisheng Peng
Sodium ion batteries (SIBs) have attracted increasing attentions as promising alternatives to lithium ion batteries (LIBs). Herein, we design and synthesize ultrasmall MnO nanoparticles (~4 nm) supported on nitrogen-doped carbon nanotubes (NDCT@MnO) as promising anode materials of SIBs. It is revealed that the carbonization temperature can greatly influence the structural features and thus the Na-storage behavior of the NDCT@MnO nanocomposites. The synergetic interaction between MnO and NDCT in the NDCT@MnO nanocomposites provides high rate capability and long-term cycling life due to high surface area, electrical conductivity, enhanced diffusion rate of Na+ ions, and prevent-ed agglomeration and high stability of MnO nanoparticles...
October 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29035030/effective-trapping-of-lithium-polysulfides-using-a-functionalized-carbon-nanotube-coated-separator-for-lithium-sulfur-cells-with-enhanced-cycling-stability
#8
Rubha Ponraj, Aravindaraj Govindaraj Kannan, Jun Hwan Ahn, Jae Hee Lee, Joonhee Kang, Byungchan Han, Dong-Won Kim
The critical issues that hinder the practical applications of lithium-sulfur batteries, such as dissolution and migration of lithium polysulfides, poor electronic conductivity of sulfur and its discharge products and low loading of sulfur, have been addressed by designing a functional separator modified using hydroxyl-functionalized carbon nanotubes (CNTOH). Density functional theory (DFT) calculations and experimental results demonstrate that the hydroxyl groups in the CNTOH provoked strong interaction with lithium polysulfides and resulted in effective trapping of lithium polysulfides within the sulfur cathode side...
October 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29034947/revealing-the-electronic-character-of-the-positive-electrode-electrolyte-interface-in-lithium-ion-batteries
#9
Giorgia Zampardi, Rafael Trocoli, Wolfgang Schuhmann, Fabio La Mantia
High voltage operating active materials are among the most promising components for positive electrodes of future high energy lithium-ion batteries. However, the operating potential range of such materials often exceeds anodically the thermodynamic stability window of the electrolyte. A surface layer is therefore formed, which is supposed to be one of the reasons for the high irreversible charge loss of these electrodes. The electronic character of such a surface layer formed at the electrode/electrolyte interface of LiNi0...
October 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29033637/cognitive-functioning-in-euthymic-bipolar-patients-on-monotherapy-with-novel-antipsychotics-or-mood-stabilizers
#10
Vesile Şentürk Cankorur, Hilal Demirel, Cem Atbaşoğlu
INTRODUCTION: Bipolar disorder is associated with cognitive dysfunction in several domains. Medication effect is a potential confounder that can only be statistically controlled in many studies. The cognitive profile in bipolar disorder during remission on maintenance antipsychotics or mood stabilizers medication has not been compared before. METHODS: We compared the cognitive profile of bipolar disorder patients euthymic for 2 month or more on monotherapy with novel antipsychotics (AP) (n=16), lithium carbonate (Li) (n=25) or valproic acid (VPA; n=26)...
September 2017: Noro Psikiyatri Arsivi
https://www.readbyqxmd.com/read/29027560/recovered-spinel-mnco2o4-from-spent-lithium-ion-batteries-for-enhanced-electrocatalytic-oxygen-evolution-in-alkaline-medium
#11
Subramanian Natarajan, S Anantharaj, Rajesh J Tayade, Hari C Bajaj, Subrata Kundu
A facile way of recovering 3d transition metals of industrial importance from spent lithium-ion batteries (LIBs) without using any surfactants has been developed. Mn- and Co-rich spent LIBs were chosen as sustainable sources for recovering the oxides of the respective elements. The physical dismantling of Li-ion batteries, chemical leaching with 2 M acetic acid, precipitation with ammonium carbonate, hydrothermal conditioning and calcination at 650 °C led to the facile formation of spherical spinel MnCo2O4 with very high morphological selectivity...
October 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29024860/facile-synthesis-n-doped-hollow-carbon-spheres-from-spherical-solid-silica
#12
K Wenelska, A Ottmann, D Moszyński, P Schneider, R Klingeler, E Mijowska
Nitrogen-doped core/shell carbon nanospheres (NHCS are prepared and their capability as an anode material in lithium-ion batteries is investigated. The synthesis methodology is based on a fast template route. The resulting molecular nanostructures are characterized by X-ray diffraction, transmission electron microscopy, thermal analysis, and nitrogen adsorption/desorption measurement as well as by cyclic voltammetry and galvanostatic cycling. The core/shell structure provides a rapid lithium transport pathway and boasts a highly reversible capacity...
October 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29024100/an-all-integrated-anode-via-interlinked-chemical-bonding-between-double-shelled-yolk-structured-silicon-and-binder-for-lithium-ion-batteries
#13
Yajie Liu, Zhixin Tai, Tengfei Zhou, Vitor Sencadas, Jian Zhang, Lei Zhang, Konstantin Konstantinov, Zaiping Guo, Hua Kun Liu
The concept of an all-integrated design with multifunctionalization is widely employed in optoelectronic devices, sensors, resonator systems, and microfluidic devices, resulting in benefits for many ongoing research projects. Here, maintaining structural/electrode stability against large volume change by means of an all-integrated design is realized for silicon anodes. An all-integrated silicon anode is achieved via multicomponent interlinking among carbon@void@silica@silicon (CVSS) nanospheres and cross-linked carboxymethyl cellulose and citric acid polymer binder (c-CMC-CA)...
October 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29022694/enhancing-distorted-metal-organic-framework-derived-zno-as-anode-material-for-lithium-storage-by-the-addition-of-ag2s-quantum-dots
#14
Weixin Song, Rowena Brugge, Ioannis G Theodorou, Alvin Lukai Lim, Yuchen Yang, Tingting Zhao, Claire H Burgess, Ian D Johnson, A Aguadero, Paul R Shearing, Dan J L Brett, Fang Xie, D Jason Riley
The lithium storage properties of the distorted metal-organic framework (MOF) derived nanosized ZnO@C are significantly improved by the introduction of Ag2S quantum dots (QDs) during the processing of the material. In the thermal treatment, the Ag2S QDs react to produce Ag nanoparticles and ZnS. The metal nanoparticles act to shorten electron pathways and improve the connectivity of the matrix and the partial sulfidation of the ZnO surface improves the cycling stability of the material. The electrochemical properties of ZnO@C, Ag2S QDs treated ZnO@C and the amorphous carbon in ZnO@C have been compared...
October 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28994847/one-step-synthesis-of-snco-nanoconfined-in-hierarchical-carbon-nanostructures-for-lithium-ion-battery-anode
#15
Jian Qin, Dongye Liu, Xiang Zhang, Naiqin Zhao, Chunsheng Shi, En-Zuo Liu, Fang He, Liying Ma, Qunying Li, Jiajun Li, Chunnian He
A new strategy for the one-step synthesis of a 0D SnCo nanoparticles-1D carbon nanotubes-3D hollow carbon submicrocube cluster (denoted as SnCo@CNT-3DC) hierarchical nanostructured material was developed via a simple chemical vapor deposition (CVD) process with the assistance of a water-soluble salt (NaCl). The adopted NaCl not only acted as a cubic template for inducing the formation of the 3D hollow carbon submicrocube cluster but also provides a substrate for the SnCo catalysts impregnation and CNT growth, ultimately leading to the successful construction of the unique 0D-1D-3D structured SnCo@CNT-3DC during the CVD of C2H2...
October 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28992630/ion-sieving-in-graphene-oxide-membranes-via-cationic-control-of-interlayer-spacing
#16
Liang Chen, Guosheng Shi, Jie Shen, Bingquan Peng, Bowu Zhang, Yuzhu Wang, Fenggang Bian, Jiajun Wang, Deyuan Li, Zhe Qian, Gang Xu, Gongping Liu, Jianrong Zeng, Lijuan Zhang, Yizhou Yang, Guoquan Zhou, Minghong Wu, Wanqin Jin, Jingye Li, Haiping Fang
Graphene oxide membranes-partially oxidized, stacked sheets of graphene-can provide ultrathin, high-flux and energy-efficient membranes for precise ionic and molecular sieving in aqueous solution. These materials have shown potential in a variety of applications, including water desalination and purification, gas and ion separation, biosensors, proton conductors, lithium-based batteries and super-capacitors. Unlike the pores of carbon nanotube membranes, which have fixed sizes, the pores of graphene oxide membranes-that is, the interlayer spacing between graphene oxide sheets (a sheet is a single flake inside the membrane)-are of variable size...
October 9, 2017: Nature
https://www.readbyqxmd.com/read/28990751/mof-derived-zno-nanoparticles-covered-by-n-doped-carbon-layers-and-hybridized-on-carbon-nanotubes-for-lithium-ion-battery-anodes
#17
Hui Zhang, Yunsong Wang, Wenqi Zhao, Mingchu Zou, Yijun Chen, Liusi Yang, Lu Xu, Huaisheng Wu, Anyuan Cao
Metal-organic frameworks (MOFs) have many promising applications in energy and environmental areas such as gas separation, catalysis, supercapacitors and batteries; the key toward those applications is controlled pyrolysis which can tailor the porous structure, improve electrical conductivity and expose metal ions in MOFs. Here, we present a systematic study on the structural evolution of zeolitic imidazolate frameworks hybridized on carbon nanotubes (CNTs) during the carbonization process. We show that a number of typical products can be obtained, depending on the annealing time, including 1) CNTs wrapped by relatively thick carbon layers, 2) CNTs grafted by ZnO nanoparticles which are covered by thin nitrogen-doped carbon layers, and 3) CNTs grafted by aggregated ZnO nanoparticles...
October 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28990604/electrochemically-exfoliated-graphene-as-a-novel-microwave-susceptor-the-ultrafast-microwave-assisted-synthesis-of-carbon-coated-silicon-graphene-film-as-a-lithium-ion-battery-anode
#18
Jong Min Kim, Dongjin Ko, Jiseop Oh, Jeongyeon Lee, Taejin Hwang, Youngmoo Jeon, Wytse Hooch Antink, Yuanzhe Piao
Graphene nanocomposites have attracted much attention in many applications due to their superior properties. However, preparing graphene nanocomposites requires a time-consuming thermal treatment to reduce the graphene or synthesize nanomaterials, in most cases. We present an ultrafast synthesis of a carbon-coated silicon-graphene nanocomposite using a commercial microwave system. Electrochemically exfoliated graphene is used as a novel microwave susceptor to deliver efficient microwave energy conversion. Unlike graphene oxide, it does not require a time-consuming pre-thermal reduction or toxic chemical reduction to absorb microwave radiation efficiently...
October 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28990391/fluorinated-sulfur-rich-covalent-triazine-frameworks-for-enhanced-confinement-of-polysulfides-in-lithium-sulfur-batteries
#19
Fei Xu, Shuhao Yang, Guangshen Jiang, Qian Ye, Bingqing Wei, Hongqiang Wang
Lithium-sulfur battery represents a promising class of energy storage technology owing to its high theoretical energy density and low cost. However, the insulating nature, shuttling of soluble polysulfides and volumetric expansion of sulfur electrodes seriously give rise to the rapid capacity fading and low utilization. In this work, these issues are significantly alleviated by both physically and chemically restricting sulfur species in fluorinated porous triazine-based frameworks (FCTF-S). One-step trimerization of perfluorinated aromatic nitrile monomers with elemental sulfur allows the simultaneous formation of fluorinated triazine-based frameworks, covalent attachment of sulfur and its homogeneous distribution within the pores...
October 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28990143/turning-an-environmental-problem-into-an-opportunity-potential-use-of-biochar-derived-from-a-harmful-marine-biomass-named-cladophora-glomerata-as-anode-electrode-for-li-ion-batteries
#20
Pejman Salimi, Soheila Javadian, Omid Norouzi, Hussein Gharibi
The electrochemical performance of lithium ion battery was enhanced by using biochar derived from Cladophora glomerata (C. glomerata) as widespread green macroalgae in most areas of the Iran's Caspian sea coast. By the utilization of the structure of the biochar, micro-/macro-ordered porous carbon with olive-shaped structure was successfully achieved through pyrolysis at 500 °C, which is the optimal temperature for biofuel production, and was activated with HCl. The biochar and HCl treatment biochar (HTB) were applied as anode electrode in lithium ion batteries...
October 8, 2017: Environmental Science and Pollution Research International
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