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lithium carbonate

Guoqiang Zou, Hongshuai Hou, Peng Ge, Zhaodong Huang, Ganggang Zhao, Dulin Yin, Xiaobo Ji
Recently, sodium-ion batteries (SIBs) are extensively explored and are regarded as one of the most promising alternatives to lithium-ion batteries for electrochemical energy conversion and storage, owing to the abundant raw material resources, low cost, and similar electrochemical behavior of elemental sodium compared to lithium. Metal-organic frameworks (MOFs) have attracted enormous attention due to their high surface areas, tunable structures, and diverse applications in drug delivery, gas storage, and catalysis...
December 11, 2017: Small
Kamran Amin, Qinghai Meng, Aziz Ahmad, Meng Cheng, Miao Zhang, Lijuan Mao, Kun Lu, Zhixiang Wei
A sulfur-linked carbonyl-based poly(2,5-dihydroxyl-1,4-benzoquinonyl sulfide) (PDHBQS) compound is synthesized and used as cathode material for lithium-ion batteries (LIBs). Flexible binder-free composite cathode with single-wall carbon nanotubes (PDHBQS-SWCNTs) is then fabricated through vacuum filtration method with SWCNTs. Electrochemical measurements show that PDHBQS-SWCNTs cathode can deliver a discharge capacity of 182 mA h g-1 (0.9 mA h cm-2 ) at a current rate of 50 mA g-1 and a potential window of 1...
December 11, 2017: Advanced Materials
A A Galyean, M R Behr, K J Cash
Nanosensors present a biological monitoring method that is biocompatible, reversible, and nano-scale, and they offer many advantages over traditional organic indicators. Typical ionophore-based nanosensors incorporate nile-blue derivative pH indicators but suffer from photobleaching while quantum dot alternatives pose a potential toxicity risk. In order to address this challenge, sodium selective nanosensors containing carbon dots and a pH-sensitive quencher molecule were developed based on an ion-exchange theory and a decoupled recognition element from the pH indicator...
December 11, 2017: Analyst
Jingjing Chen, Zhiyong Mao, Lexi Zhang, Dajian Wang, Ran Xu, Li-Jian Bie, Bradley D Fahlman
Graphitic carbon nitride (g-C3N4) behaving a layered feature with graphite was indexed as a high-content nitrogen doping carbon material, attracting the increasing attentions for the application in energy storage devices. However, poor conductivity and the resultant serious irreversible capacity loss were pronounced for g-C3N4 material due to its high nitrogen content. In this work, magnesiothermic denitriding technology is demonstrated to reduce the nitrogen content of g-C3N4 (especially graphitic nitrogen) for enhanced lithium storage properties as lithium ion battery anodes...
December 10, 2017: ACS Nano
Beibei Wang, Shaobo Cai, Gang Wang, Xiaojie Liu, Hui Wang, Jintao Bai
Hierarchical ultrathin NiCo2O4 nanosheeets grown on uniform hollow carbon microspheres (HC@NiCo2O4) are designed and fabricated by a solvothermal reaction followed with an annealing process. When evaluated as an anode for lithium ion batteries, the as-prepared HC@NiCo2O4 microspheres exhibit excellent electrochemical performance (a high reversible capacity of 1015 mA h g-1 after 100 cycles at a current density of 0.1 A g-1 and a high capacity of 805 mA h g-1 even at a high current density of 0...
November 23, 2017: Journal of Colloid and Interface Science
Rencheng Jin, Hua Jiang, Qingyao Wang, Guihua Li, Shanmin Gao
Compare to single component material, the hybrids materials with various components display superior electrochemical performance. In this work, two dimensional CoSx@NC@Sb nanosheets assembled by ultrathin CoSx nanosheets (~4 nm), thin layer of N-doped amorphous carbon combined with colloid like Sb nanoparticles are designed and synthesized via solvothermal route accompanied by carbonization and Sb deposition procedure. If applied in lithium-ion batteries, the hybrids exhibit the specific capacity of 960 mAh g-1 at the 100th cycle at 0...
December 8, 2017: ACS Applied Materials & Interfaces
Shaomao Xu, Yonggang Yao, Yuanyuan Guo, Xiaoqiao Zeng, Steven D Lacey, Huiyu Song, Chaoji Chen, Yiju Li, Jiaqi Dai, Yanbin Wang, Yanan Chen, Boyang Liu, Kun Fu, Khalil Amine, Jun Lu, Liangbing Hu
The lithium-air (Li-O2 ) battery has been deemed one of the most promising next-generation energy-storage devices due to its ultrahigh energy density. However, in conventional porous carbon-air cathodes, the oxygen gas and electrolyte often compete for transport pathways, which limit battery performance. Here, a novel textile-based air cathode is developed with a triple-phase structure to improve overall battery performance. The hierarchical structure of the conductive textile network leads to decoupled pathways for oxygen gas and electrolyte: oxygen flows through the woven mesh while the electrolyte diffuses along the textile fibers...
December 8, 2017: Advanced Materials
Klaus Oliver Schubert, Alice Wisdom
No abstract text is available yet for this article.
December 1, 2017: Australian and New Zealand Journal of Psychiatry
Parveen Sood, Ki Chul Kim, Seung Soon Jang
The high electron affinity of fullerene C60 coupled with the rich chemistry of carbon makes it a promising material for cathode applications in lithium-ion batteries. Since boron has one less electron than carbon, the presence of boron on C60 cage is expected to generate electron deficiency in C60, and thereby to enhance the electron affinity of C60. Using density functional theory (DFT), we studied the redox potentials and electronic properties of C60 and C59B. We have found that doping C60 with one boron atom results in a substantial increase in redox potential from 2...
December 7, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Edward R White, Jared J Lodico, B C Regan
The electrochemical intercalation of layered materials, particularly graphite, is fundamental to the operation of rechargeable energy-storage devices such as the lithium-ion battery and the carbon-enhanced lead-acid battery. Intercalation is thought to proceed in discrete stages, where each stage represents a specific structure and stoichiometry of the intercalant relative to the host. However, the three-dimensional structures of the stages between unintercalated and fully intercalated are not known, and the dynamics of the transitions between stages are not understood...
December 6, 2017: Nature Communications
Amaia Iturrondobeitia, Aintzane Goñi, Izaskun Gil de Muro, Luis Lezama, Teófilo Rojo
Nanoparticulate NiO and NiO/C composites with different carbon proportions have been prepared for anode application in lithium and sodium ion batteries. Structural characterization demonstrated the presence of metallic Ni in the composites. Morphological study revealed that the NiO and Ni nanoparticles were well dispersed in the matrix of amorphous carbon. The electrochemical study showed that the lithium ion batteries (LIBs), containing composites with carbon, have promising electrochemical performances, delivering specific discharge capacities of 550 mAh/g after operating for 100 cycles at 1C...
December 2, 2017: Nanomaterials
Yayuan Liu, Guangmin Zhou, Kai Liu, Yi Cui
The development of next-generation lithium-based rechargeable batteries with high energy density, low cost, and improved safety is a great challenge with profound technological significance for portable electronics, electric vehicles, and grid-scale energy storage. Specifically, advanced lithium battery chemistries call for a paradigm shift to electrodes with high Li to host ratio based on a conversion or alloying mechanism, where the increased capacity is often accompanied by drastic volumetric changes, significant bond breaking, limited electronic/ionic conductivity, and unstable electrode/electrolyte interphase...
December 5, 2017: Accounts of Chemical Research
Jian Pan, Houpu Li, Hao Sun, Ye Zhang, Lie Wang, Meng Liao, Xuemei Sun, Huisheng Peng
Driven by the increasing requirements for energy supply in both modern life and the automobile industry, the lithium-air battery serves as a promising candidate due to its high energy density. However, organic solvents in electrolytes are likely to rapidly vaporize and form flammable gases under increasing temperatures. In this case, serious safety problems may occur and cause great harm to people. Therefore, a kind of lithium-air that can work stably under high temperature is desirable. Herein, through the use of an ionic liquid and aligned carbon nanotubes, and a fiber shaped design, a new type of lithium-air battery that can effectively work at high temperatures up to 140 °C is developed...
December 4, 2017: Small
Genqiang Zhang
Sodium ion batteries (SIBs) have been considered as more promising energy storage devices in grid-level applications due to their largely reduced cost compared with that of lithium ion batteries. However, the practical application of SIBs has been seriously hindered because of the lacking of appropriate anode materials limited by the thermodynamics perspective, which is one of the central task to search for high performance anode candidates. Herein, we have developed a general one-pot strategy for the synthesis of transition metal phosphides (TMP) based hybrid nanosheets composed of carbon coated TMP nanoparticles anchoring on the surface nitrogen doped carbon nanosheets...
December 4, 2017: Chemistry: a European Journal
Jin Xie, Lei Liao, Yongji Gong, Yanbin Li, Feifei Shi, Allen Pei, Jie Sun, Rufan Zhang, Biao Kong, Ram Subbaraman, Jake Christensen, Yi Cui
Defects are important features in two-dimensional (2D) materials that have a strong influence on their chemical and physical properties. Through the enhanced chemical reactivity at defect sites (point defects, line defects, etc.), one can selectively functionalize 2D materials via chemical reactions and thereby tune their physical properties. We demonstrate the selective atomic layer deposition of LiF on defect sites of h-BN prepared by chemical vapor deposition. The LiF deposits primarily on the line and point defects of h-BN, thereby creating seams that hold the h-BN crystallites together...
November 2017: Science Advances
Mingdeng Wei, Lingxin Zeng, Renpin Liu, Lei Han, Fenqiang Luo, Xi Chen, Jianbiao Wang, Qingrong Qian, Qinghua Chen
In this work, the Si/SiO2-ordered mesoporous carbon nanocomposite (Si/SiO2-OMC) was initially fabricated through the magnesiothermic reduction strategy using two-dimensional bicontinuous mesochannel of SiO2-OMC as a precursor, combined with NaOH etching process, where crystal Si/amorphous SiO2 nanoparticles were encapsulated into OMC matrix. Such unique porous crystal Si/amorphous SiO2 nanoparticles uniformly dispersed in OMC matrix can not only mitigate the volume change of active materials during cycling process, but also improve electrical conductivity of Si/SiO2 and facilitate the Li+/Na+ diffusion...
November 30, 2017: Chemistry: a European Journal
Xin Yao, Guilue Guo, Pei-Zhou Li, Zhong-Zhen Luo, Qingyu Yan, Yanli Zhao
A green and scalable route to form a honeycomb-like macroporous network by homogeneously weaving V2O5 nanowires and carbon nanotubes (CNTs) was developed. The intertwinement between V2O5 nanowires and CNTs not only integrates nanopores into the macroporous system, but also elevates the collection and transfer of charges through the conductive network. The unique combination of V2O5 nanowires and CNTs renders the composite monolith with synergic properties for substantially enhancing electrochemical kinetics of lithiation/delithiation when used as a lithium-ion battery (LIB) cathode...
December 1, 2017: ACS Applied Materials & Interfaces
Hang Wei, Zhonghong Xia, Dingguo Xia
The exploration of anode material of lithium-ion batteries (LIBs) is still a great challenge because of its low electrical conductivity and poor durability. Transition metal oxide is proposed as a potential alternative, while the dimension and structure greatly affect its electrochemical properties. In this study, MnO/Mn2SiO4@C cuboid was prepared via polymerization-pyrolysis process. Larger MnCO3 precursor particles melted into monolithic carbon framework and formed smaller nanoparticles due to the inducing effect of Si element in phthalocyanino silicon (SiPc), thus the MnO/Mn2SiO4@C cuboids were obtained...
December 1, 2017: ACS Applied Materials & Interfaces
Hongen Wang, Xu Zhao, Kaili Yin, Yu Li, Lihua Chen, Xiao-Yu Yang, WenJun Zhang, Bao-Lian Su, Guozhong Cao
Vanadium oxides are promising anode materials for lithium ion batteries (LIBs) due to their high capacity, good safety and low cost. However, their practical application has been deferred by the poor rate capability and cycling stability. In this work, we report the designed synthesis of porous V2O3/VO2@carbon heterostructure electrode for high performance LIBs. The synergic effects of porous nanostructures, phase hybridization with self-building electric field at heterointerface, and conductive carbon implantation effectively enhance the electronic/ionic conduction and buffer the volume variation in the composite material...
December 1, 2017: ACS Applied Materials & Interfaces
Bowen Huang, Gilles Frapper
We report the discovery of novel CO2-based networks stabilized by Li+ cations in solid-state phases. Our exploration of the energy landscape of the Li-CO2 binary phase diagram using ab initio evolutionary structure searches revealed that-in addition to the well-characterized C2O42- oxalate in Li2C2O4-viable covalent CO2-based nets emerge upon compression within the 0-100 GPa pressure range. Novel molecular units are described, such as ethene-like C2O44- in C2/m Li2(CO2), finite C4O86- chains in P-1 Li3(CO2)2, one-dimensional polymeric forms based on 1,4-dioxane rings in P2/c LiCO2 and the C(O-)2 moieties in Pnma Li2CO2...
November 30, 2017: Journal of the American Chemical Society
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