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https://www.readbyqxmd.com/read/28724265/facile-synthesis-of-sio2-c-nanoparticles-anchored-on-mwnt-as-high-performance-anode-materials-for-li-ion-batteries
#1
Yan Zhao, Zhengjun Liu, Yongguang Zhang, Almagul Mentbayeva, Xin Wang, M Yu Maximov, Baoxi Liu, Zhumabay Bakenov, Fuxing Yin
Carbon-coated silica nanoparticles anchored on multi-walled carbon nanotubes (SiO2@C/MWNT composite) were synthesized via a simple and facile sol-gel method followed by heat treatment. Scanning and transmission electron microscopy (SEM and TEM) studies confirmed densely anchoring the carbon-coated SiO2 nanoparticles onto a flexible MWNT conductive network, which facilitated fast electron and lithium-ion transport and improved structural stability of the composite. As prepared, ternary composite anode showed superior cyclability and rate capability compared to a carbon-coated silica counterpart without MWNT (SiO2@C)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28722318/porous-carbon-nanofibers-encapsulated-with-peapod-like-hematite-nanoparticles-for-high-rate-and-long-life-battery-anodes
#2
Guanglin Xia, Qili Gao, Dalin Sun, Xuebin Yu
Fe2 O3 is regarded as a promising anode material for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its high specific capacity. The large volume change during discharge and charge processes, however, induces significant cracking of the Fe2 O3 anodes, leading to rapid fading of the capacity. Herein, a novel peapod-like nanostructured material, consisting of Fe2 O3 nanoparticles homogeneously encapsulated in the hollow interior of N-doped porous carbon nanofibers, as a high-performance anode material is reported...
July 19, 2017: Small
https://www.readbyqxmd.com/read/28722257/mesoporous-tin-based-oxide-nanospheres-and-graphene-composites-as-advanced-anodes-for-lithium-ion-half-full-and-sodium-ion-batteries
#3
Yanyan He, Aihua Li, Caifu Dong, Chuanchuan Li, Liqiang Xu
The large volume variations of tin-based oxides hinder their extensive applications in the field of lithium ion batteries (LIBs). In this study, structure design, hybrid fabrication and carbon coating approaches have been simultaneously adopted to relieve these weaknesses. Therefore, uniform mesoporous NiO/SnO2@rGO, Ni-Sn oxide@rGO and SnO2@rGO nanosphere composites have been selectively fabricated. Among them, the obtained NiO/SnO2@rGO composite exhibits high capacity 800 mAh g-1 at 1000 mA g-1 after 400 cycles...
July 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28722045/3d-free-standing-hierarchical-cuco2o4-nanowire-cathodes-for-rechargeable-lithium-oxygen-batteries
#4
Wang Sun, Yan Wang, Haitao Wu, Zhenhua Wang, David Rooney, Kening Sun
A carbon and binder-free cathode for use in Li-O2 cells which is based on free-standing CuCo2O4 nanowires supported on a nickel foam was synthesized by an efficient hydrothermal method. The resulting hierarchical porous and umbrella structures of the hybrid CuCo2O4@Ni foam cathodes present an excellent rate capability and cycle performance.
July 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28721729/impact-of-cl-doping-on-electrochemical-performance-in-orthosilicate-li2fesio4-a-dft-supported-experimental-approach
#5
Shivani Singh, Anish K Raj, Raja Sen, Priya Johari, Sagar Mitra
Safe and high capacity cathode materials are a long quest for commercial lithium-ion battery development. Among various searched cathode materials, Li2FeSiO4 has taken the attention due to optimal working voltage, high elemental abundance, and low toxicity. However, as per our understanding and observation, the electrochemical performance of this material is significantly limited by the intrinsic low electronic conductivity and slow lithium-ion diffusion, which limits the practical capacity (theoretical ~ 330 mAh g-1)...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714098/rational-design-of-three-layered-tio2-carbon-mos2-hierarchical-nanotubes-for-enhanced-lithium-storage
#6
Sibo Wang, Bu Yuan Guan, Le Yu, Xiong Wen David Lou
Here we demonstrate the rational design and synthesis of three-layered TiO2 @carbon@MoS2 hierarchical nanotubes for anode applications in lithium-ion batteries (LIBs). Through an efficient step-by-step strategy, ultrathin MoS2 nanosheets are grown on nitrogen-doped carbon (NC) coated TiO2 nanotubes to achieve the TiO2 @NC@MoS2 tubular nanostructures. This smart design can effectively shorten the diffusion length of Li(+) ions, increase electric conductivity of the electrode, relax volume variation of electrode materials upon cycling, and provide more active sites for electrochemical reactions...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28709340/correlation-and-transport-properties-for-mixtures-at-constant-pressure-and-temperature
#7
Alexander J White, Lee A Collins, Joel D Kress, Christopher Ticknor, Jean Clérouin, Philippe Arnault, Nicolas Desbiens
Transport properties of mixtures of elements in the dense plasma regime play an important role in natural astrophysical and experimental systems, e.g., inertial confinement fusion. We present a series of orbital-free molecular dynamics simulations on dense plasma mixtures with comparison to a global pseudo ion in jellium model. Hydrogen is mixed with elements of increasingly high atomic number (lithium, carbon, aluminum, copper, and silver) at a fixed temperature of 100 eV and constant pressure set by pure hydrogen at 2g/cm^{3}, namely, 370 Mbars...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28707882/improvement-of-the-cathode-electrolyte-interphase-on-p2-na2-3ni1-3mn2-3o2-by-atomic-layer-deposition
#8
Judith Alvarado, Chuze Ma, Shen Wang, Kimberly Nguyen, Moses Kodur, Ying Shirley Meng
Atomic layer deposition (ALD) is a commonly used coating technique for lithium ion battery electrodes. Recently, it has been applied to sodium ion battery anode materials. ALD is known to improve the cycling performance, coulombic efficiency of batteries, and maintain electrode integrity. Here, the electrochemical performance of uncoated P2-Na2/3Ni1/3Mn2/3O2 electrodes is compared to ALD coated aluminum oxide P2-Na2/3Ni1/3Mn2/3O2 electrodes. Given that ALD coatings are in the early stage of development for NIB cathode materials, little is known on how ALD coatings, in particular aluminum oxide (Al2O3), affect the electrode-electrolyte interface...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28707746/gas-evolution-in-activated-carbon-based-supercapacitors-using-protic-deep-eutectic-solvent-as-electrolyte
#9
Satyajit Phadke, Samia Amara, Meriem Anouti
One of the primary causes of ageing in supercapacitors are the irreversible faradaic reactions occurring near the operating voltage limit which lead to the production of gases resulting in device swelling, increased resistance (ESR), and lowering of the capacitance. In this study, we report a investigation of a protic "Deep Eutectic Solvent" (DES) consisting on mixture of Lithium bis(fluorosulfonyl)imide salt (LiFSI) with formamide (FMD) as H-bond donor (xLiFSI = 0.25 ; C = 2.5 M LiFSI) as electrolyte for AC based EDLC...
July 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28707367/colloidal-synthesis-of-silicon-carbon-composite-materials-for-lithium-ion-batteries
#10
Haiping Su, Alejandro A Barragan, Linxiao Geng, Donghui Long, Licheng Ling, Krassimir N Bozhilov, Lorenzo Mangolini, Juchen Guo
We report colloidal routes to synthesize silicon@carbon composites for the first time. Surface-functionalized Si nanoparticles (SiNPs) dissolved in styrene and hexadecane are used as the dispersed phase in oil-in-water emulsions, from which yolk-shell and dual-shell hollow SiNPs@C composites are produced via polymerization and subsequent carbonization. As anode materials for Li-ion batteries, the SiNPs@C composites demonstrate excellent cycling stability and rate performance, which is ascribed to the uniform distribution of SiNPs within the carbon hosts...
July 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28705736/a-worldwide-experience-of-the-management-of-battery-failures-and-chronic-device-retrieval-of-the-nanostim-leadless-pacemaker
#11
Dhanunjaya Lakkireddy, Reinoud Knops, Brett Atwater, Petr Neuzil, John Ip, Elkin Gonzalez, Paul Friedman, Pascal Defaye, Derek Exner, Kazutaka Aonuma, Rahul Doshi, Johannes Sperzel, Vivek Reddy
BACKGROUND: The Nanostim leadless pacemaker (LP) met the primary endpoints in an IDE trial, and was shown to be fully retrievable percutaneously. In October 2016, St Jude Medical, issued a worldwide alert of a battery malfunction that caused lost pacing output and LP communication. OBJECTIVE: The objective here is to report the battery failure mechanism and incidence and the worldwide patient management including device retrieval experiences. METHODS: The affected LP battery is a custom Lithium-Carbon Monofluoride (Li-CFx) cell...
July 10, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28702622/mechanism-of-ion-transport-in-perfluoropolyether-electrolytes-with-a-lithium-salt
#12
Ksenia Timachova, Mahati Chintapalli, Kevin R Olson, Sue J Mecham, Joseph M DeSimone, Nitash P Balsara
Perfluoropolyethers (PFPEs) are polymer electrolytes with fluorinated carbon backbones that have high flash points and have been shown to exhibit moderate conductivities and high cation transference numbers when mixed with lithium salts. Ion transport in four PFPE electrolytes with different endgroups was characterized by differential scanning calorimetry (DSC), ac impedance, and pulsed-field gradient NMR (PFG-NMR) as a function of salt concentration and temperature. In spite of the chemical similarity of the electrolytes, salt diffusion coefficients measured by PFG-NMR and the glass transition temperature measured by DSC appear to be uncorrelated to ionic conductivity measured by ac impedance...
July 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28702548/counterintuitive-trends-of-the-wetting-behavior-of-ionic-liquid-based-electrolytes-on-modified-lithium-electrodes
#13
Paulo Schmitz, Martin Kolek, Diddo Diddens, Marian Cristian Stan, Kirsi Jalkanen, Martin Winter, Peter Bieker
The demand for high energy densities has brought rechargeable lithium metal batteries back into the research focus. Ionic liquids (ILs) are considered as suitable electrolyte components for these systems. In this work, the wetting behavior of 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide ([C2MIm]TFSI), 1-butyl-3-methylimidazolium bis-((trifluoromethyl)sulfonyl)imide ([C4MIm]TFSI), 1-hexyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide ([C6MIm]TFSI), and N-butyl-N-methylpyrrolidinium bis((trifluoromethyl)sulfonyl)imide (Pyr14TFSI) on mechanically modified lithium electrodes, with and without lithium bis((trifluoromethyl)sulfonyl)imide (LiTFSI) conducting salt, is investigated and is compared to an organic carbonate-based electrolyte...
July 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28702061/the-effect-of-surface-treatment-with-a-fractional-carbon-dioxide-laser-on-shear-bond-strength-of-resin-cement-to-a-lithium-disilicate-based-ceramic
#14
Farzaneh Ahrari, Alireza Boruziniat, Hamideh Sadat Mohammadipour, Mehrnoosh Alirezaei
BACKGROUND: This study investigated the impact of different surface treatments, including fractional carbon dioxide (CO2) laser on shear bond strength (SBS) of resin cement to lithium disilicate ceramic. MATERIALS AND METHODS: In this in vitro study, 72 blocks of IPS e.max CAD ceramic were randomly divided into six groups in terms of treatment (n = 12). Group 1 underwent etching with 9.6% hydrofluoric (HF) acid, whereas group 2 was subjected to air abrasion with aluminum oxide particles...
May 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28696586/novel-co2-vo4-anodes-using-ultralight-3d-metallic-current-collector-and-carbon-sandwiched-structures-for-high-performance-li-ion-batteries
#15
Chao Zhu, Ziqiang Liu, Jian Wang, Jun Pu, Wenlu Wu, Qingwen Zhou, Huigang Zhang
A novel spinel Co2 VO4 is studied as the Li-ion battery anode material and it is sandwiched with a 3D ultralight porous current collector (PCC) and amorphous carbon. Co2 VO4 demonstrates the high capacity and excellent cyclability because of the mixed lithium storage mechanisms. The 3D composite structure requires no binders and replaces the conventional current collector (Cu foil) with a 3D ultralight porous metal scaffold, yielding the high electrode-based capacity. Such a novel composite anode also enables the close adhesion of Co2 VO4 to the PCC scaffold...
July 11, 2017: Small
https://www.readbyqxmd.com/read/28696444/facile-electrospinning-formation-of-carbon-confined-metal-oxide-cube-in-tube-nanostructures-for-stable-lithium-storage
#16
Ziang Liu, Ruiting Guo, Jiashen Meng, Xiong Liu, Xuanpeng Wang, Qi Li, Liqiang Mai
A unique carbon-confined metal oxide cube-in-tube nanostructure is synthesized by a facile precursor-modified electrospinning method with subsequent pyrolysis. This nanostructure has a partly graphitized carbon layer with manganese oxide nanoparticles embedded as the tube and amorphous CoSnO3 hollow cubes uniformly distributed inside the tube. As a lithium-ion battery anode, this architecture exhibits a high reversible discharge capacity and rate capability.
July 11, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28692775/yolk-shelled-c-fe3-o4-nanoboxes-as-efficient-sulfur-hosts-for-high-performance-lithium-sulfur-batteries
#17
Jiarui He, Liu Luo, Yuanfu Chen, Arumugam Manthiram
Owing to the high theoretical specific capacity (1675 mA h g(-1) ) and low cost, lithium-sulfur (Li-S) batteries offer advantages for next-generation energy storage. However, the polysulfide dissolution and low electronic conductivity of sulfur cathodes limit the practical application of Li-S batteries. To address such issues, well-designed yolk-shelled carbon@Fe3 O4 (YSC@Fe3 O4 ) nanoboxes as highly efficient sulfur hosts for Li-S batteries are reported here. With both physical entrapment by carbon shells and strong chemical interaction with Fe3 O4 cores, this unique architecture immobilizes the active material and inhibits diffusion of the polysulfide intermediates...
July 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28692755/enabling-flexible-heterostructures-for-li-ion-battery-anodes-based-on-nanotube-and-liquid-phase-exfoliated-2d-gallium-chalcogenide-nanosheet-colloidal-solutions
#18
Chuanfang John Zhang, Sang-Hoon Park, Oskar Ronan, Andrew Harvey, Andrés Seral-Ascaso, Zifeng Lin, Niall McEvoy, Conor S Boland, Nina C Berner, Georg S Duesberg, Patrick Rozier, Jonathan N Coleman, Valeria Nicolosi
2D metal chalcogenide (MC) nanosheets (NS) have displayed high capacities as lithium-ion battery (LiB) anodes. Nevertheless, their complicated synthesis routes coupled with low electronic conductivity greatly limit them as promising LiB electrode material. Here, this work reports a facile single-walled carbon nanotube (SWCNT) percolating strategy for efficiently maximizing the electrochemical performances of gallium chalcogenide (GaX, X = S or Se). Multiscaled flexible GaX NS/SWCNT heterostructures with abundant voids for Li(+) diffusion are fabricated by embedding the liquid-exfoliated GaX NS matrix within a SWCNT-percolated network; the latter improves the electron transport and ion diffusion kinetics as well as maintains the mechanical flexibility...
July 10, 2017: Small
https://www.readbyqxmd.com/read/28692094/multi-functionalized-herringbone-carbon-nanofiber-for-anodes-of-lithium-ion-batteries
#19
Mok-Hwa Kim, Min-Young Cho, Kwang-Bum Kim, Han Gi Jeong, Joong Tark Han, Kwang Chul Roh
Herringbone carbon nanofibers (HCNFs) are prepared for use as anode materials in lithium-ion batteries (LIBs). HCNFs are prepared using a Ni-Fe catalyst and subsequently multi-functionalized with oxygen using the Hummers' method, and then with both oxygen and nitrogen-containing 2-ureido-4[1H]pyrimidinone (UHP) moieties, which endow the HCNFs with the ability to form quadruple hydrogen bonds (QHBs). The as-prepared HCNFs are, on average, 13 μm in length and 100 nm in diameter, with a highly graphitic structure...
July 10, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28691792/high-performance-li-se-batteries-enabled-by-selenium-storage-in-bottom-up-synthesized-nitrogen-doped-carbon-scaffolds
#20
Hongling Lv, Renpeng Chen, Xiaoqi Wang, Yi Hu, Yanrong Wang, Tao Chen, Lianbo Ma, Guoyin Zhu, Jia Liang, Zuoxiu Tie, Jie Liu, Zhong Jin
Selenium (Se) has great promise to serve as cathode material for rechargeable batteries, owing to the good conductivity and high theoretical volumetric energy density comparable to sulfur. Herein, we report the preparation of mesoporous nitrogen-doped carbon scaffolds (NCSs) to restrain selenium for advanced lithium-selenium (Li-Se) batteries. The NCSs synthesized by a bottom-up solution-phase method have graphene-like laminar structure and well-distributed mesopores. The unique architecture of NCSs can severe as conductive framework for encapsulating selenium and polyselenides, and provide sufficient pathways to facilitate ion transport...
July 10, 2017: ACS Applied Materials & Interfaces
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