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lithium carbonate

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https://www.readbyqxmd.com/read/28211792/one-pot-synthesis-of-in-situ-carbon-coated-fe3o4-as-long-life-lithium-ion-battery-anode
#1
Min Liu, Hongyun Jin, Evan Uchaker, Zhiqiang Xie, Ying Wang, Guozhong Cao, Shuen Hou, Jiangyu Li
Fe3O4 has been regarded as a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity, low cost, and environmental friendliness. In this work, we present a one-pot reducing-composite-hydroxide-mediated (R-CHM) method to synthesize in-situ carbon-coated Fe3O4 (Fe3O4@C) at 280 oC, using Fe(NO3)3·9H2O and PEG800 as raw materials and NaOH/KOH as the medium. The as-prepared Fe3O4 octahedron has an average size of 100 nm in diameter, covered by carbon layer with the thickness of 3 nm , as revealed by FESEM and HRTEM images...
February 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28205444/revisiting-the-corrosion-of-the-aluminum-current-collector-in-lithium-ion-batteries
#2
Tianyuan Ma, Gui-Liang Xu, Yan Li, Li Wang, Xiangming He, Jianming Zheng, Jun Liu, Mark H Engelhard, Peter Zapol, Larry A Curtiss, Jacob Jorne, Khalil Amine, Zonghai Chen
The corrosion of aluminum current collectors and the oxidation of solvents at a relatively high potential have been widely investigated with an aim to stabilize the electrochemical performance of lithium-ion batteries using such components. The corrosion behavior of aluminum current collectors was revisited using a home-build high-precision electrochemical measurement system, and the impact of electrolyte components and the surface protection layer on aluminum foil was systematically studied. The electrochemical results showed that the corrosion of aluminum foil was triggered by the electrochemical oxidation of solvent molecules, like ethylene carbonate, at a relative high potential...
February 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28199854/self-assembly-synthesis-of-a-unique-stable-cocoon-like-hematite-c-nanoparticle-and-its-application-in-lithium-ion-batteries
#3
Yizhi Yan, Haolin Tang, Junsheng Li, Fan Wu, Tianbao Wu, Rui Wang, Dan Liu, Mu Pan, Zhizhong Xie, Deyu Qu
A novel cocoon-like Fe2O3@C nanoparticle was fabricated via a facile hydrothermally molecular self-assembly procedure. Compared to bare Fe2O3 nanoparticles, the carbon coated Fe2O3 nanoparticles exhibit higher specific capacity, excellent rate capacity and cyclic stability as the anode in lithium ion batteries. These cocoon-like Fe2O3@C nanoparticles carry enhanced lithium storage properties with a reversible capacity of 358mAhg(-1) after 150 cycles under the current density of 1000mAg(-1), while the carbon-free bare Fe2O3 can only deliver a much lower capacity of 127...
December 30, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28199079/heterogeneous-tio2-v2o5-carbon-nanotube-electrodes-for-lithium-ion-batteries
#4
Mert Kurttepeli, Shaoren Deng, Felix Mattelaer, Daire J Cott, Philippe Vereecken, Jolien Dendooven, Christophe Detavernier, Sara Bals
Vanadium pentoxide (V2O5) is proposed and investigated as a cathode material for lithium ion batteries. However, the dissolution of V2O5 during the charge/discharge remains as an issue at the V2O5-electrolyte interface. In this work, we present a heterogeneous nanostructure with carbon nanotubes supported V2O5/titanium dioxide (TiO2) multilayers as electrodes for thin-film Li-ion batteries. Atomic layer deposition of V2O5 on carbon nanotubes provides enhanced Li storage capacity and high rate performance. An additional TiO2 layer leads to increased morphological stability and in return higher cycling performance of V2O5/carbon nanotubes...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28196321/amorphous-ge-c-composite-sponges-synthesis-and-application-in-a-high-rate-anode-for-lithium-ion-batteries
#5
Qiuyang Ma, Wanwan Wang, Peiyuan Zeng, Zhen Fang
A Ge/C spongelike composite is prepared by the facile and scalable single-step pyrolysis of the GeOx/ethylenediamine gel process, which has a feature with three-dimensional interconnected pore structures and is hybridized with nitrogen-doped carbon. A detailed investigation shows that the pore in the sponge is formed for the departure of the gaseous products at the evaluated temperature. As an anode for lithium ion batteries, the obtained composite exhibits superior specific capacity in excess of 1016 mA h g(-1) at 100 mA g(-1) after 100 cycles...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28195467/sequential-carbon-carbon-carbon-seleniun-bonds-formation-mediated-by-iron-iii-chloride-and-diorganyl-diselenides-synthesis-and-reactivity-of-2-organoselenyl-naphthalenes
#6
Ana M S Recchi, Davi Fernando Back, Gilson Zeni
In this paper, we report an intramolecular cyclization of benzylic-substituted propargyl alcohols promoted by iron(III) chloride and diorganyl diselenides to give 2-organoselenyl-naphthalenes via a sequential carbon-carbon/carbon-selenium bonds formation. The present reaction tolerated a wide range of substituents in both propargyl alcohols and diorganyl diselenides to give the desired 2-organoselenyl-naphthalenes in good yields with high selectivity. In addition, O-acyl protected propargyl alcohol and propargyl bromide were also subjected to this protocol giving the corresponding 2-organoselenyl-naphthalenes...
February 14, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28195190/modeling-of-amorphous-sicxo6-5-by-classical-molecular-dynamics-and-first-principles-calculations
#7
Ningbo Liao, Miao Zhang, Hongming Zhou, Wei Xue
Polymer-derived silicon oxycarbide (SiCO) presents excellent performance for high temperature and lithium-ion battery applications. Current experiments have provided some information on nano-structure of SiCO, while it is very challenging for experiments to take further insight into the molecular structure and its relationship with properties of materials. In this work, molecular dynamics (MD) based on empirical potential and first principle calculation were combined to investigate amorphous SiCxO6/5 ceramics...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28191854/nanostructured-conductive-polymer-gels-as-a-general-framework-material-to-improve-electrochemical-performance-of-cathode-materials-in-li-ion-batteries
#8
Ye Shi, Xingyi Zhou, Jun Zhang, Andrea M Bruck, Andrew C Bond, Amy C Marschilok, Kenneth J Takeuchi, Esther S Takeuchi, Guihua Yu
Controlling architecture of electrode composites is of particular importance to optimize both electronic and ionic conduction within the entire electrode and improve the dispersion of active particles, thus achieving the best energy delivery from a battery. Electrodes based on conventional binder systems that consist of carbon additives and nonconductive binder polymers suffer from aggregation of particles and poor physical connections, leading to decreased effective electronic and ionic conductivities. Here we developed a three-dimensional (3D) nanostructured hybrid inorganic-gel framework electrode by in situ polymerization of conductive polymer gel onto commercial lithium iron phosphate particles...
February 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28191851/delicate-structural-control-of-si-siox-c-composite-via-high-speed-spray-pyrolysis-for-li-ion-battery-anodes
#9
Seung Jong Lee, Hye Jin Kim, Tae Hoon Hwang, Sunghun Choi, Sung Hyeon Park, Erhan Deniz, Dae Soo Jung, Jang Wook Choi
Despite the high theoretical capacity, silicon (Si) anodes in lithium-ion batteries have difficulty in meeting the commercial standards in various aspects. In particular, the huge volume change of Si makes it very challenging to simultaneously achieve high initial Coulombic efficiency (ICE) and long-term cycle life. Herein, we report spray pyrolysis to prepare Si-SiOx composite using an aqueous precursor solution containing Si nanoparticles, citric acid, and sodium hydroxide (NaOH). In the precursor solution, Si nanoparticles are etched by NaOH with the production of [SiO4]4-...
February 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28191849/kinetics-tuning-the-electrochemistry-of-lithium-dendrites-formation-in-lithium-batteries-through-electrolytes
#10
Ran Tao, Xuanxuan Bi, Shu Li, Ying Yao, Feng Wu, Qian Wang, Cunzhong Zhang, Jun Lu
Lithium batteries are one of the most advance energy storage devices in the world and have attracted extensive research interests. However, lithium dendrite growth was a safety issue which handicapped the application of pure lithium metal in the negative electrode. In this investigation, two solvents, propylene carbonate (PC) and 2-methyl-tetrahydrofuran (2MeTHF), and four Li(+) salts, LiPF6, LiAsF6, LiBF4 and LiClO4 were investigated in terms of their effects on the kinetics of lithium dendrite formation in eight electrolyte solutions...
February 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28187255/redox-route-from-inorganic-precursor-li2c2-to-nanopatterned-carbon
#11
Paul Simon, Xian-Juan Feng, Matej Bobnar, Peter Höhn, Ulrich Schwarz, Wilder Carrillo-Cabrera, Michael Baitinger, Yuri Grin
We present the synthesis route to carbon with hierarchical morphology on the nanoscale. The structures are generated using crystalline orthorhombic lithium carbide (Li2C2) as precursor with nanolamellar organization. Careful treatment by SnI4 oxidizes carbon at the fairly low temperature of 80 °C to the elemental state and keeps intact the initial crystallite shape, the internal lamellar texture of particles, and the lamellae stacking. The reaction product is amorphous but displays in the microstructure parallel band-like arrangements with diameters in the range of 200-500 nm...
February 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28181597/synthesis-of-alkynyl-furoxans-rare-carbon-carbon-bond-forming-reaction-on-a-furoxan-ring
#12
Ryosuke Matsubara, Shuhei Eguchi, Akihiro Ando, Masahiko Hayashi
A rare carbon-carbon-bond forming reaction on a furoxan ring has been developed. The nucleophilic aromatic substitution (SNAr) reaction of 4-nitrofuroxans with alkynyl lithium proceeded with high yields, which enabled the first practical synthesis of both alkynyl furoxan regioisomers. Due to the versatility of the alkyne functional group, various derivatizations of the carbon-carbon triple bond in the afforded products were possible. Thus, this developed method is a convergent approach to a wide spectrum of carbon-substituted furoxans...
February 9, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28177638/parasitic-reactions-in-nano-sized-silicon-anodes-for-lithium-ion-batteries
#13
Han Gao, Lisong Xiao, Ingo Plümel, Gui-Liang Xu, Yang Ren, Xiaobing Zuo, Yuzi Liu, Christof Schulz, Hartmut Wiggers, Khalil Amine, Zonghai Chen
When designing nano-Si electrodes for lithium-ion batteries, the detrimental effect of the c-Li15Si4 phase formed upon full lithiation is often a concern. In this study, Si nanoparticles with controlled particle sizes and morphology were synthesized and parasitic reactions of the metastable c-Li15Si4 phase with the non-aqueous electrolyte was investigated. The use of smaller Si nanoparticles (~ 60 nm) and the addition of fluoroethylene carbonate additive played decisive roles in the parasitic reactions such that the c-Li15Si4 phase could disappear at the end of lithiation...
February 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28173702/ultralong-cycle-life-achieved-by-a-natural-plant-miscanthus-%C3%A3-giganteus-for-lithium-oxygen-batteries
#14
Shu Li, Xuanxuan Bi, Ran Tao, Qingzhen Wang, Ying Yao, Feng Wu, Cunzhong Zhang
Large energy-storage systems and electric vehicles require energy devices with high power and high energy density. Lithium oxygen (Li-O2) batteries could achieve high energy density, but they are still facing problems such as low practical capacity and poor cyclability. Here, we prepare activated carbons (MGACs) based on the natural plant Miscanthus × giganteus (MG) through slow pyrolysis. It possesses a large surface area, plenty of active sites, and high porosity, which are beneficial to the utilization of oxygen electrode in Li-O2 batteries...
February 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28168159/synthesis-of-metal-nanoparticles-and-metal-fluoride-nanoparticles-from-metal-amidinate-precursors-in-1-butyl-3-methylimidazolium-ionic-liquids-and-propylene-carbonate
#15
Kai Schütte, Juri Barthel, Manuel Endres, Marvin Siebels, Bernd M Smarsly, Junpei Yue, Christoph Janiak
Decomposition of transition-metal amidinates [M{MeC(NiPr)2} n ] [M(AMD) n ; M=Mn(II), Fe(II), Co(II), Ni(II), n=2; Cu(I), n=1) induced by microwave heating in the ionic liquids (ILs) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm][PF6]), 1-butyl-3-methylimidazolium trifluoromethanesulfonate (triflate) ([BMIm][TfO]), and 1-butyl-3-methylimidazolium tosylate ([BMIm][Tos]) or in propylene carbonate (PC) gives transition-metal nanoparticles (M-NPs) in non-fluorous media (e...
February 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28165213/polysulfide-anchoring-mechanism-revealed-by-atomic-layer-deposition-of-v2o5-and-sulfur-filled-carbon-nanotubes-for-lithium-sulfur-batteries
#16
Rachel E Carter, Landon Oakes, Nitin Muralidharan, Adam P Cohn, Anna Douglas, Cary L Pint
Despite the promise of surface engineering to address the challenge of polysulfide shuttling in sulfur-carbon composite cathodes, melt infiltration techniques limit mechanistic studies correlating engineered surfaces and polysulfide anchoring. Here, we present a controlled experimental demonstration of polysulfide anchoring using vapor phase isothermal processing to fill the interior of carbon nanotubes (CNTs) after assembly into binder-free electrodes and atomic layer deposition (ALD) coating of polar V2O5 anchoring layers on the CNT surfaces...
February 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28165041/enhanced-performance-of-sulfur-infiltrated-bimodal-mesoporous-carbon-foam-by-chemical-solution-deposition-as-cathode-materials-for-lithium-sulfur-batteries
#17
Tae-Gyung Jeong, Jinyong Chun, Byung-Won Cho, Jinwoo Lee, Yong-Tae Kim
The porous carbon matrix is widely recognized to be a promising sulfur reservoir to improve the cycle life by suppressing the polysulfide dissolution in lithium sulfur batteries (LSB). Herein, we synthesized mesocellular carbon foam (MSUF-C) with bimodal mesopore (4 and 30 nm) and large pore volume (1.72 cm(2)/g) using MSUF silica as a template and employed it as both the sulfur reservoir and the conductive agent in the sulfur cathode. Sulfur was uniformly infiltrated into MSUF-C pores by a chemical solution deposition method (MSUF-C/S CSD) and the amount of sulfur loading was achieved as high as 73% thanks to the large pore volume with the CSD approach...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28162038/study-of-the-factors-influencing-the-metals-solubilisation-from-a-mixture-of-waste-batteries-by-response-surface-methodology
#18
Kulchaya Tanong, Lucie Coudert, Myriam Chartier, Guy Mercier, Jean-François Blais
This paper presents an innovative process for the recovery of the valuable metals from a mixture of spent batteries. Different types of batteries, including alkaline, zinc-carbon (Zn-C), nickel cadmium (Ni-Cd), nickel metal hydride (Ni-MH), lithium ion (Li-ion) and lithium metallic (Li-M) batteries, were mixed according to the proportion of the Canadian sales of batteries. A Box-Behnken design was applied to find the optimum leaching conditions allowing a maximum of valuable metal removals from a mixture of spent batteries in the presence of an inorganic acid and a reducing agent...
February 6, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28157287/three-dimensional-rebar-graphene
#19
Junwei Sha, Rodrigo V Salvatierra, Pei Dong, Yilun Li, Seoung-Ki Lee, Tuo Wang, Chenhao Zhang, Jibo Zhang, Yongsung Ji, Pulickel M Ajayan, Jun Lou, Naiqin Zhao, James M Tour
Free-standing robust three-dimensional (3D) rebar graphene foams (GFs) were developed by a powder metallurgy template method with multiwalled carbon nanotubes (MWCNTs) as a reinforcing bar, sintered Ni skeletons as a template and catalyst, and sucrose as a solid carbon source. As a reinforcement and bridge between different graphene sheets and carbon shells, MWCNTs improved the thermostability, storage modulus (290.1 kPa) and conductivity (21.82 S cm(-1)) of 3D GF resulting in a high porosity and structurally stable 3D rebar GF...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28155853/a-high-performance-lithium-ion-capacitor-achieved-by-the-integration-of-a-sn-c-anode-and-a-biomass-derived-microporous-activated-carbon-cathode
#20
Fei Sun, Jihui Gao, Yuwen Zhu, Xinxin Pi, Lijie Wang, Xin Liu, Yukun Qin
Hybridizing battery and capacitor materials to construct lithium ion capacitors (LICs) has been regarded as a promising avenue to bridge the gap between high-energy lithium ion batteries and high-power supercapacitors. One of the key difficulties in developing advanced LICs is the imbalance in the power capability and charge storage capacity between anode and cathode. Herein, we design a new LIC system by integrating a rationally designed Sn-C anode with a biomass-derived activated carbon cathode. The Sn-C nanocomposite obtained by a facile confined growth strategy possesses multiple structural merits including well-confined Sn nanoparticles, homogeneous distribution and interconnected carbon framework with ultra-high N doping level, synergically enabling the fabricated anode with high Li storage capacity and excellent rate capability...
February 3, 2017: Scientific Reports
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