共查询到20条相似文献,搜索用时 15 毫秒
1.
Wang X Guan H Chen S Li H Zhai T Tang D Bando Y Golberg D 《Chemical communications (Cambridge, England)》2011,47(45):12280-12282
Self-stacked Co(3)O(4) nanosheets separated by carbon layers were synthesized via a facile method. They exhibit excellent electrochemical performance that results from superior electronic conductivity endowed by carbon, a reduced Li(+) diffusion length within the building blocks and a large electrode/electrolyte contact area due to the interspaces between the blocks. 相似文献
2.
Choi J Jin J Jung IG Kim JM Kim HJ Son SU 《Chemical communications (Cambridge, England)》2011,47(18):5241-5243
Through a solution approach, SnSe(2) nanoplate-graphene composites were prepared and applied as anode materials in lithium ion batteries, showing promising storage performance superior to SnSe(2) nanoplates or graphene alone. 相似文献
3.
Hua-Chao Tao Xue-Lin Yang Lu-Lu Zhang Shi-Bing Ni 《Journal of Solid State Electrochemistry》2014,18(7):1989-1994
Polyaniline encapsulated silicon (Si/PANI) nanocomposite as anode materials for high-capacity lithium ion batteries has been prepared by an in situ chemical polymerization of aniline monomer in the suspension of Si nanoparticles. The obtained Si/PANI nanocomposite demonstrates a reversible specific capacity of 840 mAh g?1 after 100 cycles at a rate of 100 mA g?1 and excellent cycling stability. The enhanced electrochemical performance can be due to that the polyaniline (PANI) matrix offers a continuous electrically conductive network as well as enhances the compatibility of electrode materials and electrolyte as a result of suppressing volume stress of Si during cycles and preventing the agglomeration of Si nanoparticles. 相似文献
4.
《Electrochemistry communications》2007,9(4):713-717
The Si–AB5 (MmNi3.6Co0.7Al0.3Mn0.4 alloy) composites with a high tap density as anode materials for lithium-ion batteries were synthesized by ball-milling. Si nanoparticles are distributed homogeneously on the surface of the AB5 matrix. The electrochemical performance of the Si–AB5 composites as a function of Si content was investigated. It is demonstrated that the Si–AB5 composite delivers a larger reversible capacity and better cycle ability because the inactive AB5 alloy can accommodate the large volume changes of Si nanoparticles distributed on the surface of the Si–AB5 composite during cycling. In particular, the Si–AB5 composite containing 20 wt% Si with the high tap density of 2.8 g/cm3 obtained after ball-milling for 11 h exhibits an initial and maximum reversible (charge) capacity of 370 and 385 mAh/g. The high capacity retention can be achieved after 50 cycles in the potential range from 0.02 to 1.5 V. 相似文献
5.
Guo Shihang Feng Yi Ding Weiqiang Li Xiaodan Yang Lvye Yao Jianfeng 《Journal of Solid State Electrochemistry》2019,23(1):1-7
Journal of Solid State Electrochemistry - The morphology of Co-based zeolitic imidazolate framework is affected by the molar ratio of 2-methylimidazole and Co2+ used during the synthesis. In this... 相似文献
6.
Xianwei Guo Xia Lu Xiangpeng Fang Ya Mao Zhaoxiang Wang Liquan Chen Xiaoxue Xu Hong Yang Yinong Liu 《Electrochemistry communications》2010,12(6):847-850
Hollow microspheres composed of phase-pure ZnFe2O4 nanoparticles (hierarchically structured) have been prepared by hydrothermal reaction. The unique hollow spherical structure significantly increases the specific capacity and improves capacity retention of this material. The product of each phase transition during initial discharge (ZnFe2O4 ? Li0.5ZnFe2O4 ? Li2ZnFe2O4 → Li2O + Li–Zn + Fe) and their structural reversibility are recognized by X-ray diffraction and electrochemical characterization. The products of the deeply discharged (Li–Zn alloy and Fe) and recharged materials (Fe2O3) were clarified based on high resolution transmission electron microscopic technique and first-principle calculations. 相似文献
7.
《中国化学快报》2023,34(4):107465
Sodium-ion batteries (SIB) have attracted widespread attention in large-scale energy storage fields owing to the abundant reserve in the earth and similar properties of sodium to lithium. Biomass-based carbon materials with low-cost, controllable structure, simple processing technology, and environmental friendliness tick almost all the right boxes as one of the promising anode materials for SIB. Herein, we present a simple novel strategy involving tea tomenta biomass-derived carbon anode with enhanced interlayer carbon distance (0.44 nm) and high performance, which is constructed by N,P co-doped hard carbon (Tea-1100-NP) derived from tea tomenta. The prepared Tea-1100-NP composite could deliver a high reversible capacity (326.1 mAh/g at 28 mA/g), high initial coulombic efficiency (ICE = 90% at 28 mA/g), stable cycle life (262.4 mAh/g at 280 mA/g for 100 cycles), and superior rate performance (224.5 mAh/g at 1400 mA/g). Experimental results show that the excellent electrochemical performance of Tea-1100-NP due to the high number of active N,P-containing groups, and disordered amorphous structures provide ample active sites and increase the conductivity, meanwhile, large amounts of microporous shorten the Na+ diffusion distance as well as quicken ion transport. This work provides a new type of N,P co-doped high-performance tomenta-derived carbon, which may also greatly promote the commercial application of SIB. 相似文献
8.
Li Zhitong Zhao Jian Nie Jiajin Yao Shaowei Wang Jing Feng Xiaoxin 《Journal of Solid State Electrochemistry》2020,24(5):1133-1142
Journal of Solid State Electrochemistry - In this paper, Co3O4/NiO/C composites were prepared by in situ co-precipitation and heat treatment with Zn/Co-ZIF-derived N-doped porous carbon as carbon... 相似文献
9.
The structural evolution of the Co3O4 fine powders prepared by rheological phase reaction and pyrolysis method upon different temperature has been investigated using X‐ray diffraction (XRD) topography. The electrochemical performance of Co3O4 electrode materials for Li‐ion batteries is studied in the form of Li/Co3O4 cells. The reversible capacity as high as 930 mAh/g for the Co3O4 sample heat‐treated at 600 °C is achieved and sustained over 30 times charge‐discharge cycles at room temperature. The detailed information concerning the reaction mechanism of Co3O4 active material together with lithium ion is obtained through ex‐situ XRD topography, X‐ray photoelectron spectroscopy (XPS) analysis and cyclic voltammetry (CV) technique. And it is revealed that a “two‐step” reaction is involved in the charge and discharge of the Li/Co3O4 cells, in which Co3O4 active material is reversibly reduced into xCoO(3 ‐ x)CoO and then into metallic Co. 相似文献
10.
Hierarchical SnO2 with double carbon coating composites as anode materials for lithium ion batteries
Hierarchical SnO2 with double carbon coating (polypyrrole-derived carbon and reduced graphene oxide in order) composites have been successfully synthesized as anode materials for lithium ion batteries. The composites were characterized and examined by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, cyclic voltammetry, and galvanostatic discharge/charge tests. Such a novel nanostructure can not only provide a high conductivity but also prevent aggregation of SnO2 nanoparticles, leading to the improvement of the cycling performance. Comparing with pure hierarchical SnO2 and polypyrrole-derived carbon-coated hierarchical SnO2, hierarchical SnO2 with double carbon coating composite exhibits higher lithium storage capacities and better cycling performance, 554.8 mAh g?1 after 50 cycles at a current density of 250 mA g?1. In addition, the rate performance of hierarchical SnO2 with double carbon coating composite is also very well. For all the improved performances, this double carbon coating architecture may provide some references for other electrode materials of lithium ion batteries. 相似文献
11.
Lee HS Choi J Jin J Chun J Lee SM Kim HJ Son SU 《Chemical communications (Cambridge, England)》2012,48(1):94-96
Microporous organic network (MON)-Co(3)O(4) composites were obtained via organometallic complexation of cobalt carbonyl with MONs and showed enhanced stability as anode materials due to the buffering effect of MONs. 相似文献
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L. J. Ning Y. P. Wu L. Z. Wang S. B. Fang R. Holze 《Journal of Solid State Electrochemistry》2005,9(7):520-523
Three kinds of silicon-containing disordered carbons have been prepared by pyrolysis of polysiloxanes with different amounts of phenyl side groups. X-ray powder diffraction, X-ray photoelectron spectroscopy and electrochemical capacity measurements were performed to study their behaviors. Graphite crystallites, micropores, and silicon species affect their electrochemical performances. All of them present high reversible capacities, >372 mAh/g. Since the graphite crystallites are very small, they contribute very little to reversible capacity. The number of micropores produced by gas emission during the heat-treatment process decides whether they exhibit reversible capacity. Si mainly exists in the form C–Si–O and influences the irreversible capacity. There is no evident capacity fading in the first ten cycles, indicating promising properties for these disordered carbons. 相似文献
15.
Yan Lu Yong Wang Yuqin Zou Zheng Jiao Bing Zhao Yaqin He Minghong Wu 《Electrochemistry communications》2010,12(1):101-105
This paper reports the microwave-assisted synthesis of Co3O4 nanomaterials with different morphologies including nanoparticles, rod-like nanoclusters and macroporous platelets. The new macroporous platelet-like Co3O4 morphology was found to be the best suitable for reversible lithium storage properties. It displayed superior cycling performances than nanoparticles and rod-like nanoclusters. More interestingly, excellent high rate capabilities (811 mAh g?1 at 1780 mA g?1 and 746 mAh g?1 at 4450 mA g?1) were observed for macroporous Co3O4 platelet. The good electrochemical performance could be attributed to the unique macroporous platelet structure of Co3O4 materials. 相似文献
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Deng Y Zhang Q Tang S Zhang L Deng S Shi Z Chen G 《Chemical communications (Cambridge, England)》2011,47(24):6828-6830
ZnFe(2)O(4)/C hollow spheres have been synthesized via a facile solvothermal route using low cost raw materials. The resulting composite showed a very high specific capacity of 841 mAh g(-1) after 30 cycles and good rate capability. 相似文献
18.
Wang JZ Zhong C Wexler D Idris NH Wang ZX Chen LQ Liu HK 《Chemistry (Weinheim an der Bergstrasse, Germany)》2011,17(2):661-667
Fe3O4–graphene composites with three‐dimensional laminated structures have been synthesised by a simple in situ hydrothermal method. From field‐emission and transmission electron microscopy results, the Fe3O4 nanoparticles, around 3–15 nm in size, are highly encapsulated in a graphene nanosheet matrix. The reversible Li‐cycling properties of Fe3O4–graphene have been evaluated by galvanostatic discharge–charge cycling, cyclic voltammetry and impedance spectroscopy. Results show that the Fe3O4–graphene nanocomposite with a graphene content of 38.0 wt % exhibits a stable capacity of about 650 mAh g?1 with no noticeable fading for up to 100 cycles in the voltage range of 0.0–3.0 V. The superior performance of Fe3O4–graphene is clearly established by comparison of the results with those from bare Fe3O4. The graphene nanosheets in the composite materials could act not only as lithium storage active materials, but also as an electronically conductive matrix to improve the electrochemical performance of Fe3O4. 相似文献
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M. M. Rahman Jia-Zhao Wang David Wexler Yu-Yuan Zhang Xin-Jun Li Shu-Lei Chou Hua-Kun Liu 《Journal of Solid State Electrochemistry》2010,14(4):571-578
Anatase TiO2 nanoribbons/nanotubes (TiO2-NRTs) have been synthesised successfully via a reflux method followed by drying in a vacuum oven, and then, silver-coated
TiO2 NRTs (Ag/TiO2-NRTs) were prepared by coating silver particles onto the TiO2-NRTs surface by the traditional silver mirror reaction. The physical properties of the synthesised products were examined
in detail using X-ray diffraction, field emission gun scanning electron microscopy, energy-dispersive X-ray spectroscopy,
and transmission electron microscopy, respectively. The results indicated that the Ag nanoparticles were uniformly deposited
on the surface of the TiO2 nanoribbons/nanotubes. The electrochemical properties were investigated by a variety of techniques. The rate capability and
cycle durability for the Ag/TiO2-NRTs were improved compared with TiO2-NRTs. It is speculated that the Ag-coated TiO2 nanoribbons/nanotubes are an effective anode candidate for lithium ion batteries. 相似文献