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Amangeldi Torayev, José Alexis Rucci, Pieter M Magusin, Arnaud Demortiere, Vincent De Andrade, Clare P Grey, Céline Merlet, Alejandro A Franco
While large dispersions in electrochemical performance have been reported for lithium oxygen batteries in the literature, they have not been investigated in any depth. The variability in the results is often assumed to arise from differences in cell design, electrode structure, handling and cell preparation at different times. An accurate theoretical framework turns out to be needed to get a better insight into the mechanisms underneath and to interpreting experimental results. Here, we develop and use a pore network model to simulate the electrochemical performance of three-dimensionally resolved lithium-oxygen cathode mesostructures obtained from TXM nano-computed tomography images...
January 17, 2018: Journal of Physical Chemistry Letters
Jian Guan, Xiongwu Zhong, Xiang Chen, Xianjun Zhu, Panlong Li, Jianhua Wu, Yalin Lu, Yan Yu, Shangfeng Yang
Porous carbon and nanocarbons have been extensively applied as anode materials for high-energy density lithium-ion batteries (LIBs). However, as another representative nanocarbon, fullerenes, such as C60, have been scarcely utilized in LIBs because of their poor electrochemical reversibility. Herein, we designed a novel C60-embedded nitrogen-doped microporous carbon material (denoted as C60@N-MPC), which was derived from a zeolitic imidazolate framework-8 (ZIF-8) precursor, demonstrating its promising application as a superior anode material for LIB...
January 17, 2018: Nanoscale
Wei Zhang, Hui-Chia Yu, Lijun Wu, Hao Liu, Aziz Abdellahi, Bao Qiu, Jianming Bai, Bernardo Orvananos, Fiona C Strobridge, Xufeng Zhou, Zhaoping Liu, Gerbrand Ceder, Yimei Zhu, Katsuyo Thornton, Clare P Grey, Feng Wang
Nanoparticulate electrodes, such as Li x FePO4, have unique advantages over their microparticulate counterparts for the applications in Li-ion batteries because of the shortened diffusion path and access to nonequilibrium routes for fast Li incorporation, thus radically boosting power density of the electrodes. However, how Li intercalation occurs locally in a single nanoparticle of such materials remains unresolved because real-time observation at such a fine scale is still lacking. We report visualization of local Li intercalation via solid-solution transformation in individual Li x FePO4 nanoparticles, enabled by probing sub-angstrom changes in the lattice spacing in situ...
January 2018: Science Advances
ZhiXiong Yang, RenGui Li, ZhengHua Deng
Charging the cells above a conventional voltage of 4.2 V is a promising attempt to increase the energy density of Lithium Cobalt Oxide (LCO), however, the problem of crystal instability at high voltage that leading deterioration of cycle performance needs to be urgently resolved. In this work, as an effective and easy approach to improve the cycle performance and crystal stability of LCO cycling at 4.5 V high voltage, we demonstrate direct surface modification of a LCO cathode by poly [N,N-bis(2-cryano-ethyl)-acrylamide]...
January 16, 2018: Scientific Reports
Suyun Tian, Guannan Zhu, Yanping Tang, Xiaohua Xie, Qian Wang, Yufei Ma, Gu Qiao Ding, Xiaoming Xie
Various graphene-based Si nanocomposites have been reported to improve the performance of active materials in Li ion battery. However, these candidates still yield severe capacity fading due to the electrical disconnection and fracture caused by huge volume changes with extended cycles.Therefore, we design a novel three-dimensional cross-linking structure of graphene and single-wall carbon nanotube to encapsulate Si nanoparticles. The synthesized three-dimensional structure is ascribed to the excellent self-assembly of carbon nanotube with graphene oxide and a thermal treatment process at 900 ºC...
January 17, 2018: Nanotechnology
Yuki Kato, Shinya Shiotani, Keisuke Morita, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
We report the preparation of thick electrode all-solid-state lithium-ion cells in which a large geometric capacity of 15.7 mAh cm-2 was achieved at room temperature using a 600 μm-thick cathode layer. The effect of ionic conductivity on the discharge performance was then examined using two different materials for the solid electrolyte. Furthermore, important morphological information regarding the tortuosity factor was electrochemically extracted from the capacity-current data. The effect of tortuosity on cell performance was also quantitatively discussed...
January 17, 2018: Journal of Physical Chemistry Letters
Tao Chen, Baorui Cheng, Guoyin Zhu, Renpeng Chen, Yi Hu, Lianbo Ma, Hongling Lv, Yanrong Wang, Jia Liang, Zuoxiu Tie, Zhong Jin, Jie Liu
No abstract text is available yet for this article.
January 17, 2018: Nano Letters
Johan F Triana, Daniel Pelaez Ruiz, Jose Luis Sanz-Vicario
The quantum photodynamics of a simple diatomic molecule with a permanent dipole immersed within an optical cavity containing a quantized radiation field is studied in detail. The chosen molecule under study, lithium fluoride (LiF), is characterized by the presence of an avoided crossing between the two lowest 11Σ potential energy curves (covalent-ionic diabatic crossing). Without field, after prompt excitation from the ground state 11Σ, the excited nuclear wave packet moves back and forth in the upper 21Σ state, but in the proximity of the avoided crossing, the non-adiabatic coupling transfers part of the nuclear wave packet to the lower 11Σ state, which eventually leads to dissociation...
January 16, 2018: Journal of Physical Chemistry. A
Jinbo Zhang, Chaofeng Zhang, Wei Li, Qi Guo, Hongcai Gao, Ya You, Yutao Li, Zhiming Cui, Ke-Cheng Jiang, Huijin Long, Dawei Zhang, Sen Xin
In this work, nitrogen-doped LaNiO3 perovskite was prepared and studied, for the first time, as a bifunctional electrocatalyst for oxygen cathode in a rechargeable lithium-oxygen battery. N doping was found to significantly increase the Ni3+ contents and oxygen vacancies on the bulk surface of the perovskite, which helped to promote the oxygen reduction reaction and oxygen evolution reaction of the cathode and therefore, enabled reversible Li2O2 formation and decomposition on the cathode surface. As a result, the oxygen cathodes loaded with the N-doped LaNiO3 catalyst showed improved electrochemical performance in terms of discharge capacity and cycling stability to promise practical Li-O2 batteries...
January 17, 2018: ACS Applied Materials & Interfaces
Fangxinyu Zeng, Jinyao Chen, Feng Yang, Jian Kang, Ya Cao, Ming Xiang
In this study, polyamide-aluminum foil-polypropylene (PA-Al-PP) composite films with different orientation status of the PP layer were prepared, and their morphology, tensile, peeling and heat seal behavior were studied. The comparative study of tensile and fracture behaviors of single-layer film of PA, Al and PP, as well as the composite films of PA-Al, PP-Al and PA-Al-PP revealed that in PA-Al-PP composite film, the PA layer with the highest tensile strength can share the tensile stress from the Al layer during stretching, while the PP layer with the lowest tensile strength can prevent further development of the small cracks on boundary of the Al layer during stretching...
January 16, 2018: Materials
Huitian Liu, Zhongqiang Shan, Wenlong Huang, Dongdong Wang, Zejing Lin, Zongjie Cao, Peng Chen, Shuxian Meng, Li Chen
The utilization of silicon/carbon composites as anode materials to replace the commercial graphite is hampered by their tendency to huge volumetric expansion, costly raw materials, and complex synthesis processes in lithium-ion batteries. Herein, self-assembly method is successfully applied to prepare hierarchical silicon nanoparticles@oxidized mesocarbon microbeads/carbon (Si@O-MCMB/C) composites for the first time, in which O-MCMB core and low-cost sucrose-derived carbon shell not only effectively enhance the electrical conductivity of the anode, but also mediate the dramatic volume change of silicon during cycles...
January 16, 2018: ACS Applied Materials & Interfaces
Victoria A Pollard, Samantha A Orr, Ross McLellan, Alan R Kennedy, Eva Hevia, Robert E Mulvey
Cooperativity between the Li and Al centres is implicated in catalytic hydroboration reactions of aldehydes and ketones with pinacolborane via heteroleptic lithium diamidodihydridoaluminates. In addition to implementing hydroalumination, these versatile heteroleptic ates can also perform as amido bases as illustrated with an acidic triazole.
January 16, 2018: Chemical Communications: Chem Comm
Nai-Wei Liu, Kamil Hofman, André Herbert, Georg Manolikakes
An efficient cross-coupling of sodium or lithium sulfinates with aryl iodides, using a combination of nickel and photoredox catalysis, is described. The dual catalyst system enables a versatile synthesis of aryl sulfones at room temperature in good yields and displays a broad functional group compatibility. The potential utility of this method in the late-stage diversification of complex molecules and in the conversion of organolithium reagents and sulfur dioxide into sulfones is demonstrated.
January 16, 2018: Organic Letters
Cheng Wang, Mengmeng Zhen, Juan Wang, Xin Wang
Lithium-sulfur batteries (LSBs) are receiving extensive attention because of their high theoretical energy density. However, practical applications of LSBs are still hindered by the rapid capacity decay and short cycle life, especially at high rates. Herein, a highly N-doped (~13.42 at%) hierarchical carbon sponge (HNCS) having strong chemical adsorptions toward lithium polysulfide was fabricated by a simple sol-gel route followed with carbonization. When using the HCNS as the sulfur host material in cathode and HNCS-coated separator as separator, the battery delivers an excellent cycling stability with high specific capacities of 424/326 mAh g-1, low capacity fading rates of 0...
January 15, 2018: Chemistry: a European Journal
Ning Zhang, Yuanyuan Wang, Ming Jia, Yongchang Liu, Jianzhong Xu, Lifang Jiao, Fangyi Cheng
We here report on the preparation and Li-ion battery anode application of ultrasmall Sn nanoparticles (∼5 nm) uniformly embedded in spherical hollow carbon. The novel Sn-C composite shows a high Li-storage capacity (743 mA h g-1 at 0.5 A g-1) with unprecedentedly high cyclic stability (92.1% capacity retention after 6000 cycles at 4 A g-1).
January 16, 2018: Chemical Communications: Chem Comm
Daiko Takamatsu, Akio Yoneyama, Yusuke Asari, Tatsumi Hirano
A fundamental understanding of concentrations of salts in the lithium-ion battery electrolytes during battery operation is important for optimal operation and design of lithium-ion batteries. However, there are few techniques that can be used to quantitatively characterize salt concentration distributions in the electrolytes during the battery operation. In this paper, we demonstrate that in operando X-ray phase imaging can quantitatively visualize the salt concentration distributions that arise in electrolytes during battery operation...
January 15, 2018: Journal of the American Chemical Society
Janaína Peixoto-da-Silva, Andrana K Calgarotto, Katiucha R Rocha, Caroline Palmeira-Dos-Santos, Soraya S Smaili, Gustavo J S Pereira, Fernando V Pericole, Adriana da Silva S Duarte, Sara T O Saad, Claudia Bincoletto
Although Tyrosine kinase inhibitors (TKIs) that target Bcr-Abl play a key role in Chronic Myeloid Leukemia (CML) therapy, they do not eradicate CML-initiating cells, which lead to the emergence of drug resistance. Here we used the lithium, a GSK-3 inhibitor, to attempt to potentiate the effects of nilotinib against leukemia cells. For this purpose, a K562 leukemia cell line and bone marrow cells from untreated Chronic Myeloid Leukemia (CML) patients, prior to any exposure to TKIs, were used as a model. Our results demonstrated that the combination of lithium + nilotinib (L + N) induced K562-cell death and cleaved caspase-3 when compared to lithium or nilotinib alone, accompanied by GSK-3β phosphorylation and Bcr-Abl oncoprotein levels reduction...
January 12, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Anatolii Mokshin, Bulat N Galimzyanov
The dynamic structure factor is the quantity, which can be measured by means of Brillouin light-scattering as well as by means of inelastic scattering of neutrons and X-rays. The spectral (or frequency) moments of the dynamic structure factor define directly the sum rules of the scattering law. The theoretical scheme formulated in this study allows one to describe the dynamics of local density fluctuations in simple liquids and to obtain the expression of the dynamic structure factor in terms of the spectral moments...
January 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Hui Zhao, Yang Wei, Cheng Wang, Rui-Min Qiao, Wanli Yang, Phillip B Messersmith, Gao Liu
The excessive volume changes during cell cycling of Si-based anode in lithium ion batteries impeded its application. One major reason for the cell failure is particle isolation during volume shrinkage in delithiation process, which makes strong adhesion between polymer binder and anode active material particles a highly desirable property. Here, a biomimetic side-chain conductive polymer incorporating catechol, a key adhesive component of the mussel holdfast protein, was synthesized. Atomic force microscopy (AFM) based single molecule force measurements of mussel-inspired conductive polymer binder contacting a silica surface revealed similar adhesion toward substrate when compared with an effective Si anode binder, homo-polyacrylic acid (PAA), with the added benefit of being electronically conductive...
January 15, 2018: ACS Applied Materials & Interfaces
Lin Liu, Ya-Xia Yin, Jin-Yi Li, Shu-Hua Wang, Yu-Guo Guo, Li-Jun Wan
The lithium metal anode has attracted soaring attention as an ideal battery anode. Unfortunately, nonuniform Li nucleation results in uncontrollable growth of dendritic Li, which incurs serious safety issues and poor electrochemical performance, hindering its practical applications. Herein, this study shows that uniform Li nucleation/growth can be induced by an ultralight 3D current collector consisting of in situ nitrogen-doped graphitic carbon foams (NGCFs) to realize suppressing dendritic Li growth at the nucleating stage...
January 15, 2018: Advanced Materials
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