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Rose E Ruther, Kevin A Hays, Seong Jin An, Jianlin Li, David L Wood, Jagjit Nanda
Silicon-graphite composites are under development for the next generation of high-capacity lithium-ion anodes, and vibrational spectroscopy is a powerful tool to identify the different mechanisms that contribute to performance loss. With alloy anodes, the underlying causes of cell failure are significantly different in half-cells with lithium metal counter electrodes compared to full cells with standard cathodes. However, most studies which take advantage of vibrational spectroscopy have only examined half-cells...
May 24, 2018: ACS Applied Materials & Interfaces
Wan-Sheng Xiong, Yu Xia, Yun Jiang, Yuyang Qi, Weiwei Sun, Dan He, Yumin Liu, Xingzhong Zhao
The direct utilization of metallic lithium and sodium as the anodes for rechargeable batteries would be highly advantageous, which has been considered as one of the most promising choices for next-generation high-energy-density storage devices. Although the induced safety concerns, inferior rate and cycling performance severely hinder the commercialization of lithium-metal batteries (LMB) and sodium-metal batteries (SMB), the recent development of nanotechnology-based solutions really revives the lithium/sodium metal anodes for high-energy batteries...
May 24, 2018: ACS Applied Materials & Interfaces
Shunchao Ma, Jiawei Wang, Jun Huang, Zhen Zhou, Zhangquan Peng
The addition of H2O, even trace amount, in aprotic Li-O2 batteries has a remarkable impact on achieving high capacity by triggering solution mechanism, and even reducing charge overpotential. However, the critical role of H2O in promoting solution mechanism still lacks persuasive spectroscopic evidence, moreover, the origin of low polarization remains incompletely understood. Herein, by in situ spectroscopic identification of reaction intermediates, we directly verify that H2O additive is able to alter oxygen reduction reaction (ORR) pathway subjected to solution-mediated growth mechanism of Li2O2...
May 24, 2018: Journal of Physical Chemistry Letters
Gina Greco, Matteo Agostini, Ilaria Tonazzini, Damiano Sallemi, Stefano Barone, Marco Cecchini
In the last decades new types of cell cultures have been introduced to provide better cell survival and development, and micro/nano-environmental physico-chemical conditions aimed to mimic those present in vivo. However, despite the efforts made, the systems available to date are often difficult to replicate and use. Here, an easy-to-use surface acoustic wave (SAW)-based platform is presented for realizing dynamic cell cultures that is compatible with standard optical microscopes, incubators and cell culture dishes...
May 23, 2018: Analytical Chemistry
Chao Luo, Xiao Ji, Ji Chen, Karen Gaskell, Xinzi He, Yujia Liang, Jianjun Jiang, Chunsheng Wang
Organic electrode materials are promising for green and sustainable lithium ion batteries. However, the high solubility of organic materials in the liquid electrolyte results in the shuttle reaction and fast capacity decay. Herein, azo compounds are firstly applied in all solid-state lithium batteries (ASSLB) to suppress the dissolution challenge. Due to the high compatibility of azobenzene (AB) based compounds to Li3PS4 (LPS) solid electrolyte, the LPS solid electrolyte is used to prevent the dissolution and shuttle reaction of AB...
May 23, 2018: Angewandte Chemie
Fang Wu, Hao Wang, Jiayuan Shi, Zongkai Yan, Shipai Song, Bangheng Peng, Xiaokun Zhang, Yong Xiang
Due to its high specific capacity, silicon is considered as a promising anode materials for LIBs. While, the synthesis strategies for those previous silicon-based anode materials with delicate hierarchically-structure are complicated or hazardous. Here, prussian blue analogues (PBAs), as widely used in ink, is deposited on the silicon nanoparticles surface (PBAs@Si-450) to modify silicon nanoparticles with a transition metal atoms and N doped carbon layer. A facile and green synthesis procedure of PBAs@Si-450 nanocomposites are precipitated in a co-precipitation process combined with a thermal treatment process at 450 oC...
May 23, 2018: ACS Applied Materials & Interfaces
Jiale Fu, Daobin Mu, Borong Wu, Jiaying Bi, Hui Cui, Hao Yang, Hanfeng Wu, Feng Wu
An amount (5wt.%) of lithium tungstate (Li2WO4) as an additive significantly improves the cycle and rate performances of LiNi0.6Co0.2Mn0.2O2 electrode at the cut-off voltage of 4.6V. The 5wt.% Li2WO4-mixed LiNi0.6Co0.2Mn0.2O2 electrode delivers a reversible capacity of 199.2 mAhg-1 and keeps 73.1% capacity for 200 cycles at 1C. It retains 67.4% capacity after 200 cycles at 2C and delivers a discharge capacity of 167.3mAh g-1 at 10C, while those of the pristine electrode are only 44.7% and 87.5mAh g-1, respectively...
May 23, 2018: ACS Applied Materials & Interfaces
JinCheng Du, YuHai Tang, Yu Wang, PengHui Shi, JinChen Fan, QunJie Xu, YuLin Min
In this work, we report a facile route to fabricate a ZnCo2O4 nanosheet derived from metal-organic frameworks. The as-prepared ZnCo2O4 nanosheet material for lithium-ion batteries shows an excellent electrochemical performance. The obtained ZnCo2O4 nanosheet delivers a high reversible capacity of 1640.8 mA h g-1 at a current density of 100 mA g-1 after 50 cycles. More importantly, even at a current density of 1500 mA g-1, the electrode material still exhibits a discharge capacity of 581.3 mA h g-1 after 190 cycles...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Leonor Maria, Isabel C Santos, Isabel Santos
The reaction of [UI3(thf)4] with the sodium or lithium salts of hydrobis(2-mercapto-1-methylimidazolyl)borate ligands ([H(R)B(timMe)2]-) in a 1 : 2 ratio, in tetrahydrofuran, gave the U(iii) complexes [UI{κ3-H,S,S'-H(R)B(timMe)2}2(thf)2] (R = H (1), Ph (2)) in good yields. Crystals of [UI{κ3-H,S,S'-H(Ph)B(timMe)2}2(thf)2] (2) were obtained by recrystallization from a tetrahydrofuran/acetonitrile solution, and the ion-separated uranium complex [U{κ3-H,S,S'-H(Ph)B(timMe)2}2(CH3CN)3][I] (3-I) was obtained by dissolution of 2 in acetonitrile followed by recrystallization...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Hao Wan, Hao Xiong, Xiaohe Liu, Gen Chen, Ning Zhang, Haidong Wang, Renzhi Ma, Guanzhou Qiu
On account of its high theoretical capacity, silicon (Si) has been regarded as a promising anode material for Li-ion batteries. Extracting Si content from earth-abundant and low-cost aluminosilicate minerals, rather than from artificial silica (SiO2) precursors, is a more favorable and practical method for the large-scale application of Si anodes. In this work, three-dimensionally interconnected (3D-interconnected) Si frameworks with a branch diameter of ∼15 nm are prepared by the reduction of amorphous SiO2 nanotubes derived from natural halloysite clay...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Ying Jiang, Shi Chen, Daobin Mu, Zhikun Zhao, Chunli Li, Zepeng Ding, Chaoxiang Xie, Feng Wu
Flexible TiO2/SiO2/C films are prepared via an electrospinning approach and used as self-supporting electrodes for LIBs, which exhibits excellent high-rate capability with a capacity of 115.5 mA h g-1 at 8 A g-1 (9.8 C rate) and good storage performance. It also shows great long-term cycle of 700 cycles at 200 mA g-1 with a capacity of 380.1 mA h g-1 and a high capacity retention of 88.3%s. Thus, it has the potential as electrodes for flexible LIBs owing to its flexibility and excellent electrochemical performance...
May 22, 2018: ChemSusChem
Claudia Pisanu, Urs Heilbronner, Alessio Squassina
Bipolar disorder (BD) is a common and disabling psychiatric condition with a severe socioeconomic impact. BD is treated with mood stabilizers, among which lithium represents the first-line treatment. Lithium alone or in combination is effective in 60% of chronically treated patients, but response remains heterogenous and a large number of patients require a change in therapy after several weeks or months. Many studies have so far tried to identify molecular and genetic markers that could help us to predict response to mood stabilizers or the risk for adverse drug reactions...
May 22, 2018: Molecular Diagnosis & Therapy
Jinggao Wu, Maowen Xu, Chun Tang, Guannan Li, Hong He, Chang Ming Li
F-Doping effects on polyaniline-derived carbon coated Li3V2(PO4)3 (Li3V2(PO4)3-xFx@C) as a cathode for high performance Li rechargeable batteries are systematically investigated with a combined experimental and DFT theoretical calculation approach. The results clearly indicate that the doping amount has a significant impact on the rate capability and long cycle life. The optimal material (Li3V2(PO4)2.88F0.12@C) delivers 123.16 mA h g-1@2C, which is close to the theoretical value (133 mA h g-1), while showing a greatly improved cycle stability...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
I González, A N Sosa, A Trejo, M Calvino, A Miranda, M Cruz-Irisson
Theoretical studies on the effect of Li on the electronic properties of porous silicon are still scarce; these studies could help us in the development of Li-ion batteries of this material which overcomes some limitations that bulk silicon has. In this work, the effect of interstitial and surface Li on the electronic properties of porous Si is studied using the first-principles density functional theory approach and the generalised gradient approximation. The pores are modeled by removing columns of atoms of an otherwise perfect Si crystal, dangling bonds of all surfaces are passivated with H atoms, and then Li is inserted on interstitial positions on the pore wall and compared with the replacement of H atoms with Li...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jia-Huan Hou, Di Wu, Jia-Yuan Liu, Si-Yi Li, Dan Yu, Ying Li
The interaction of the superalkali cation Li3+ with water molecules, as well as the structures and stability of the resulting water complexes are theoretically studied at the MP2/6-311++G(d,p) level. A great number of geometrical configurations were obtained for the Li3+(H2O)n (n = 1-5) complexes and Li3+ is found to have a maximum coordination number of four. Natural population analysis shows that the charge distribution of Li3+ becomes seriously uneven upon interaction with five water molecules, so it loses ring conjugation and splits in the lowest-energy isomer of Li3+(H2O)5...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
Jorge S Gutiérrez, Juan G Navedo, Andrea Soriano-Redondo
No abstract text is available yet for this article.
May 2018: Nature
Marcio Gerhardt Soeiro-de-Souza, Maria Concepcion Garcia Otaduy, Rodrigo Machado-Vieira, Ricardo Alberto Moreno, Fabiano G Nery, Claudia Leite, Beny Lafer
BACKGROUND: Bipolar disorder is a chronic and recurrent illness characterized by depressive and manic episodes. Proton magnetic resonance spectroscopy (1 H-MRS) studies have demonstrated glutamate (Glu) system abnormalities in BD, but it is unclear how Glu varies among mood states and how medications modulate it. The objective of this study was to investigate the influence of mood stabilizers on anterior cingulate cortex Glu levels using 1 H-MRS during euthymia. METHODS: One hundred twenty-eight bipolar I disorder (BDI) euthymic subjects and 80 healthy control subjects underwent 3T brain 1 H-MRS imaging examination including acquisition of an anterior cingulate cortex single voxel (8 cm3 ) 1 H-MRS, based on a point resolved spectroscopy (PRESS) sequence with an echo time of 80 ms and a repetition time of 1500 ms (BIPUSP MRS study)...
March 31, 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
Maitê Munhoz Scherer, Catina Prochnow, Andressa Borin Venturini, Gabriel Kalil Rocha Pereira, Thiago Augusto de Lima Burgo, Marília Pivetta Rippe, Luiz Felipe Valandro
OBJECTIVES: To evaluate the effect of different glass-ceramic surface treatments and aging on the fatigue failure load of a lithium disilicate glass-ceramic adhesively cemented to a dentin analogue material. METHODS: One hundred and twenty (120) disc-shaped lithium disilicate specimens (Ø=10mm, thickness=1.5mm) were produced and randomly allocated (n=20) into 6 groups, considering 2 study factors: "surface treatment" in 3 levels (SIL-silane application only; HF5+SIL-5% hydrofluoric acid etching and silane application; ME&P-etching with an one-step ceramic primer), and "storage" in 2 levels (baseline-storage for 7 days; aging-storage for 90 days+12,000 thermal cycles)...
May 19, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Qinghang Meng, Maureen Mongan, Jingjing Wang, Ying Xia
Morphogenesis is a complex and highly coordinated process orchestrated by temporal spatial activity of developmental pathways. How the different pathways interact to guide the developmental program remains an intriguing and open question. MAP3K1-JNK and Wnt are signaling pathways crucial for embryonic eyelid closure, an epithelial morphogenetic event conserved in mammals. Here we used a mouse model of eyelid development and genetic and biochemistry tools to investigate the relationships between the two pathways...
May 19, 2018: Developmental Biology
Shaomao Xu, Dennis W McOwen, Chengwei Wang, Lei Zhang, Wei Luo, Chaoji Chen, Yiju Li, Yunhui Gong, Jiaqi Dai, Yudi Kuang, Chunpeng Yang, Tanner R Hamann, Eric D Wachsman, Liangbing Hu
Solid-state electrolytes (SSEs) have been widely considered as enabling materials for the practical application of lithium metal anodes. However, many problems inhibit the widespread application of solid state batteries, including the growth of lithium dendrites, high interfacial resistance, and the inability to operate at high current density. In this study, we report a 3D mixed electron/ion conducting framework (3D-MCF) based on a porous-dense-porous trilayer garnet electrolyte structure created via tape casting to facilitate the use of a 3D solid state lithium metal anode...
May 22, 2018: Nano Letters
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