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lithium carbonate

Lin Lu, Shurui Yang, Feixia Min, Shiquan Wang, Fei Teng, Guohua Li, Chuanqi Feng, Zhaoquan Ai
Zn1-xCoxCO3 (ZCCO) microspheres were synthesized by a modified solvothermal method (ball milling-solvothermal combination method) using ZnCl2, CoCl2, and NH4HCO3 as raw materials. All samples were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectra (FT-IR), and Scanning electron microscopy (SEM) technique. The results showed the introduction of Co and molar ratio of Zn and Co play crucial roles in the morphology and electrochemical performance of the ZCCO. As anode materials for lithium ion battery (LIB), all ZCCO electrodes possess high specific capacities and good cycle performance...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Li-Li Chen, Xiang-Qian Shen, Mao-Xiang Jing, Sheng-Wen Zhu, Zhi-Chao Pi, Jing-Quan Li, Hong-Ai Zhai, Ke-Song Xiao
A LiFePO4/C composite fiber membrane was fabricated by the electrospinning method and subsequent thermal treatment. The thermal decomposition process was analyzed by TG/DSC, the morphology, microstructure and composition were studied using SEM, TEM, XRD, Raman, respectively. The results indicated that the prepared LiFePO4/C composite fibers were composed of nanosized LiFePO4 crystals and amorphous carbon coatings, which formed a three dimensional (3D) long-range networks, greatly enhanced the electronic conductivity of LiFePO4 electrode up to 3...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Ruiyuan Zhuang, Shanshan Yao, Maoxiang Jing, Xiangqian Shen, Jun Xiang, Tianbao Li, Kesong Xiao, Shibiao Qin
One-dimensional molybdenum dioxide-carbon nanofibers (MoO2-CNFs) were prepared using an electrospinning technique followed by calcination, using sol-gel precursors and polyacrylonitrile (PAN) as a processing aid. The resulting samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Brunauer-Emmet-Teller (BET) surface area measurements, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). MoO2-CNFs with an average diameter of 425-575 nm obtained after heat treatment were used as a matrix to prepare sulfur/MoO2-CNF cathodes for lithium-sulfur (Li-S) batteries...
2018: Beilstein Journal of Nanotechnology
Yen-Ming Chen, Shih-Ting Hsu, Yu-Hsien Tseng, Te-Fu Yeh, Sheng-Shu Hou, Jeng-Shiung Jan, Yuh-Lang Lee, Hsisheng Teng
This study uses graphene oxide quantum dots (GOQDs) to enhance the Li+ -ion mobility of a gel polymer electrolyte (GPE) for lithium-ion batteries (LIBs). The GPE comprises a framework of poly(acrylonitrile-co-vinylacetate) blended with poly(methyl methacrylate) and a salt LiPF6 solvated in carbonate solvents. The GOQDs, which function as acceptors, are small (3-11 nm) and well dispersed in the polymer framework. The GOQDs suppress the formation of ion-solvent clusters and immobilize PF6- anions, affording the GPE a high ionic conductivity and a high Li+ -ion transference number (0...
February 13, 2018: Small
Mangesh I Chaudhari, Ajay Muralidharan, Lawrence R Pratt, Susan B Rempe
Progress in understanding liquid ethylene carbonate (EC) and propylene carbonate (PC) on the basis of molecular simulation, emphasizing simple models of interatomic forces, is reviewed. Results on the bulk liquids are examined from the perspective of anticipated applications to materials for electrical energy storage devices. Preliminary results on electrochemical double-layer capacitors based on carbon nanotube forests and on model solid-electrolyte interphase (SEI) layers of lithium ion batteries are considered as examples...
February 12, 2018: Topics in Current Chemistry (Journal)
Eunho Cha, Mumukshu D Patel, Juhong Park, Jeongwoon Hwang, Vish Prasad, Kyeongjae Cho, Wonbong Choi
Among the candidates to replace Li-ion batteries, Li-S cells are an attractive option as their energy density is about five times higher (~2,600 Wh kg-1). The success of Li-S cells depends in large part on the utilization of metallic Li as anode material. Metallic lithium, however, is prone to grow parasitic dendrites and is highly reactive to several electrolytes; moreover, Li-S cells with metallic Li are also susceptible to polysulfides dissolution. Here, we show that ~10-nm-thick two-dimensional (2D) MoS2 can act as a protective layer for Li-metal anodes, greatly improving the performances of Li-S batteries...
February 12, 2018: Nature Nanotechnology
Xiang Hu, Yan Li, Guang Zeng, Jingchun Jia, Hongbing Zhan, Zhenhai Wen
The exploration of anode materials for lithium ion batteries (LIBs) or sodium ion batteries (SIBs) represents a grand technological challenge to meet the continuously increased demand for high-performance energy storage market. Here we report a facile and reliable synthetic strategy for in situ growth of few-layer MoS2 nanosheets on reduced graphene oxide (rGO) crosslinked hollow carbon spheres (HCS) with forming three dimensional (3D) network nanohybrids (MoS2-rGO/HCS). Systematic electrochemical studies demonstrate, as anode of LIBs, the as-developed MoS2-rGO/HCS can deliver a reversible capacity of 1145 mAh g-1 after 100 cycles at 0...
February 12, 2018: ACS Nano
Saul Perez Beltran, Perla Beatriz Balbuena
A novel sulfur/graphene architecture emulates the Li-S battery cathode electrochemical behavior, promoting the S-C interaction through the edges of graphene sheets. A random mixture of S8 rings mixed with small graphene sheets is simulated at 64%-wt. S loading. Structural stabilization and S reduction calculations are performed with classical reactive molecular dynamics. This methodology allowed accounting for the collective behavior of the S and graphene structures. The S encapsulation induces ring opening and the S phase evolves into a distribution of small chain-like structures interacting with C through the graphene edges...
February 12, 2018: ChemSusChem
Guoxin Gao, Lei Shi, Shiyao Lu, Ting Gao, Zhaoyang Li, Yiyang Gao, Shujiang Ding
Carbonaceous hybrid nanocomposites with a porous flaky structure hold great promise as high-performance electrodes for lithium-ion batteries (LIBs); yet large-scale synthesis is still a challenge. In this work, we successfully develop a novel carbon hybrid structure of carbon-coated ZnFe2O4 nanoflakes (ZnFe2O4@C NFs) through a fast ethylene glycol (EG)-mediated metal alkoxide method, refluxing at 200 °C in EG and a post-calcination at 500 °C in a N2 atmosphere. The organic components in the pre-synthesized ZnFe-alkoxide precursor (ZnFe2(OCH2CH2O)4) can be transferred into an amorphous carbon layer easily surrounding the crystalline ZnFe2O4 subunits during the annealing process...
February 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Nuno Mendonça, Marcondes C França, António Freire Gonçalves, Cristina Januário
Machado-Joseph disease (MJD) also known as Spinocerebellar ataxia type 3, is a hereditary neurodegenerative disease associated with severe clinical manifestations and premature death. Although rare, it is the most common autosomal dominant spinocerebellar ataxia worldwide and has a distinct geographic distribution, reaching peak prevalence in certain regions of Brazil, Portugal and China. Due to its clinical heterogeneity, it was initially described as several different entities and as had many designations over the last decades...
2018: Advances in Experimental Medicine and Biology
Wei Tian, Han Hu, Yixian Wang, Peng Li, Jingyan Liu, Jialiang Liu, Xiaobo Wang, Xiangdong Xu, Zhongtao Li, Qingshan Zhao, Hui Ning, Wenting Wu, Mingbo Wu
Molybdenum (Mo)-based compounds with properly engineered nanostructure usually possess improved reversible lithium storage capabilities, which offer great promise to boost the performance of lithium-ion batteries (LIBs). Nevertheless, a lack of efficient and high-yield methods for constructing rational nanostructures has largely restricted the application of these potentially important materials. Herein we demonstrate a metal-organic frameworks (MOFs) mediated strategy to successfully synthesize a series of one-dimensional Mo-based/carbon composites with distinct nanostructures...
February 9, 2018: ACS Nano
Dazhi Shen, Chaofan Huang, Lihui Gan, Jian Liu, Zhengliang Gong, Minnan Long
In this work, we propose a novel and facile route for rational design of Si@SiO2/C anode material by using sustainable and environment-friendly cellulose as carbon resource. In order to simultaneously obtain SiO2 layer and carbon scaffold, a special designed homogeneous cellulose solution and commercial Si nanopowder are used as the start materials, and cellulose/Si composite is direct assembled by an in-situ regenerating method. Subsequently, Si@SiO2/C composite is obtained after carbonization. As expected, Si@SiO2 is homogenously encapsulated in cellulose-derived carbon network...
February 9, 2018: ACS Applied Materials & Interfaces
Shaohong Liu, Jia Li, Xue Yan, Quanfei Su, Yuheng Lu, Jieshan Qiu, Zhiyu Wang, Xidong Lin, Junlong Huang, Ruliang Liu, Bingna Zheng, Luyi Chen, Ruowen Fu, Dingcai Wu
Lithium-sulfur (Li-S) batteries, based on the redox reaction between elemental sulfur and lithium metal, have attracted great interest because of their inherently high theoretical energy density. However, the severe polysulfide shuttle effect and sluggish reaction kinetics in sulfur cathodes, as well as dendrite growth in lithium-metal anodes are great obstacles for their practical application. Herein, a two-in-one approach with superhierarchical cobalt-embedded nitrogen-doped porous carbon nanosheets (Co/N-PCNSs) as stable hosts for both elemental sulfur and metallic lithium to improve their performance simultaneously is reported...
February 9, 2018: Advanced Materials
Zhendong Lei, Qinsi Yang, Yi Xu, Siyu Guo, Weiwei Sun, Hao Liu, Li-Ping Lv, Yong Zhang, Yong Wang
Conjugated polymeric molecules have been heralded as promising electrode materials for the next-generation energy-storage technologies owing to their chemical flexibility at the molecular level, environmental benefit, and cost advantage. However, before any practical implementation takes place, the low capacity, poor structural stability, and sluggish ion/electron diffusion kinetics remain the obstacles that have to be overcome. Here, we report the synthesis of a few-layered two-dimensional covalent organic framework trapped by carbon nanotubes as the anode of lithium-ion batteries...
February 8, 2018: Nature Communications
Chenpei Yuan, Qiong Wu, Qi Shao, Qiang Li, Bo Gao, Qian Duan, Heng-Guo Wang
Free-standing and flexible organic cathode based on aromatic carbonyl compound/carbon nanotubes (CNTs) has been successfully synthesized by a simple vacuum filtration strategy. The obtained flexible and free-standing film could be directly used as the binder-, additive- and current collector-free cathode for lithium ion batteries (LIBs) and sodium ion batteries (SIBs). Benefitting from the synergistic effect provided by the aromatic carbonyl compound and CNTs, the flexible organic cathode shows excellent lithium and sodium storage properties, including high reversible capacity (∼150 mAh g-1 at 50 mA g-1 for LIBs and 57...
January 31, 2018: Journal of Colloid and Interface Science
Marc-Antoine Sani, Pierre-Alexandre Martin, Ruhamah Yunis, Fangfang Chen, Maria Forsyth, Michael Deschamps, Luke A O'Dell
Dynamic nuclear polarisation (DNP) enhanced solid-state NMR spectroscopy has been used to study an ionic liquid salt solution (N-methyl-N-propyl-pyrrolidinium bis(fluorosulfonyl)imide, C3mpyrFSI, containing 1.0 m lithium bis(fluorosulfonyl)imide, 6LiFSI) in its glassy state at a temperature of 92 K. The incorporation of a biradical to enable DNP signal enhancement allowed the proximities of the lithium to the individual carbon sites on the pyrrolidinium cation to be probed using a 13C-6Li REDOR pulse sequence...
February 8, 2018: Journal of Physical Chemistry Letters
Suyun Tian, Guannan Zhu, Yanping Tang, Xiaohua Xie, Qian Wang, Yufei Ma, Guqiao Ding, Xiaoming Xie
Various graphene-based Si nanocomposites have been reported to improve the performance of active materials in Li-ion batteries. However, these candidates still yield severe capacity fading due to the electrical disconnection and fractures caused by the huge volume changes over extended cycles. Therefore, we have designed a novel three-dimensional cross-linked graphene and single-wall carbon nanotube structure to encapsulate the Si nanoparticles. The synthesized three-dimensional structure is attributed to the excellent self-assembly of carbon nanotubes with graphene oxide as well as a thermal treatment process at 900 °C...
February 8, 2018: Nanotechnology
Huiwei Du, Xuchun Gui, Rongliang Yang, Zhiqiang Lin, Binghao Liang, Wenjun Chen, Yongjia Zheng, Hai Zhu, Jun Chen
Carbon nanomaterials with 3D structures as sulfur hosts have been widely developed in lithium-sulfur batteries because of their high specific surface area, high conductivity and structural stability. However, sulfur, loaded by melting-diffusion method, is usually attached to the outside surface of carbon host, resulting in weak adsorption to expose polysulfide. Herein, we report a template-free method for synthesizing graphene-like nano-cell (GLC) with high in situ sulfur loading (S@GLC). The GLC is expected to provide physical adsorption by enclosed graphene cell architecture and chemical adsorption by pyridinic N-doping and oxygen functional group...
February 8, 2018: Nanoscale
Ji-Yoon Song, Hyeon-Haeng Lee, Won Gi Hong, Yun Suk Huh, Yun Sung Lee, Hae Jin Kim, Young-Si Jun
For practical application of lithium-sulfur batteries (LSBs), it is crucial to develop sulfur cathodes with high areal capacity and cycle stability in a simple and inexpensive manner. In this study, a carbon cloth infiltrated with a sulfur-containing electrolyte solution (CC-S) was utilized as an additive-free, flexible, high-sulfur-loading cathode. A freestanding carbon cloth performed double duty as a current collector and a sulfur-supporting/trapping material. The active material in the form of Li₂S₆ dissolved in a 1 M LiTFSI-DOL/DME solution was simply infiltrated into the carbon cloth (CC) during cell fabrication, and its optimal loading amount was found to be in a range between 2 and 10 mg/cm² via electrochemical characterization...
February 7, 2018: Nanomaterials
Zhaohui Meng, Song Wang, Lijuan Wang, Hongjiang Hou
N-Doped carbon coated Li2ZnTi3O8 (LZTO@C-N) anodes have been successfully synthesized via a simple NTA-assisted solid-state method using NTA as C and N sources, as well as a chelating agent. It is shown that the N element can be doped into carbon. The N-doped carbon greatly benefits the electrochemical performance of LZTO@C-N. The initial capacities of 276.5, 271.3 and 231.9 mA h g-1 are delivered at 2, 3 and 5 A g-1, respectively, for LZTO@C-N-2 with a carbon content of 4.89%. 186.0, 177.3 and 159.7 mA h g-1 are still maintained at the 100th cycle, respectively...
February 7, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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