共查询到20条相似文献,搜索用时 31 毫秒
1.
Yanjie Wang Mengmeng Zhen Huiling Liu Cheng Wang 《Journal of Solid State Electrochemistry》2018,22(10):3069-3076
A facile strategy was developed to prepare interlayer-expanded MoS2/graphene composites through a one-step hydrothermal reaction method. MoS2 nanosheets with several-layer thickness were observed to uniformly grow on the surface of graphene sheets. And the interlayer spacing of MoS2 in the composites was determined to expand to 0.95 nm by ammonium ions intercalation. The MoS2/graphene composites show excellent lithium storage performance as anode materials for Li-ion batteries. Through gathering advantages including expanded interlayers, several-layer thickness, and composited graphene, the composites exhibit reversible capacity of 1030.6 mAh g?1 at the current density of 100 mA g?1 and still retain a high specific capacity of 725.7 mAh g?1 at a higher current density of 1000 mA g?1 after 50 cycles. 相似文献
2.
Yingqiao Xu Shujin Hou Guang Yang Ting Lu Likun Pan 《Journal of Solid State Electrochemistry》2018,22(3):785-795
In this work, porous NiO microspheres interconnected by carbon nanotubes (NiO/CNTs) were successfully fabricated by the pyrolysis of nickel metal-organic framework precursors with CNTs and evaluated as anode materials for lithium-ion batteries (LIBs). The structures, morphologies, and electrochemical performances of the samples were characterized by X-ray diffraction, N2 adsorption-desorption, field emission scanning electron microscopy, cyclic voltammetry, galvanostatic charge/discharge tests, and electrochemical impedance spectroscopy, respectively. The results show that the introduction of CNTs can improve the lithium-ion storage performance of NiO/CNT composites. Especially, NiO/CNTs-10 exhibits the highest reversible capacity of 812 mAh g?1 at 100 mA g?1 after 100 cycles. Even cycled at 2 A g?1, it still maintains a stable capacity of 502 mAh g?1 after 300 cycles. The excellent electrochemical performance of NiO/CNT composites should be attributed to the formation of 3D conductive network structure with porous NiO microspheres linked by CNTs, which benefits the electron transfer ability and the buffering of the volume expansion during the cycling process. 相似文献
3.
Ginkgo leave, a naturally abundant resource, has been successfully employed as the raw material to prepare nitrogen doped porous carbon (NDPC) materials. The preparation of the porous carbon does not involve assistance of any activation or template technique. The as‐obtained NDPC shows favorable features for electrochemical energy storage, which can not only provide multiple sites for the storage and insertion of Li ions, but also facilitate rapid mass transport of electrons and Li ions. As a result, the NDPC when evaluated as an anode material for lithium ion batteries delivers high reversible capacity (505 mAh·g?1 at 0.1 C), excellent rate capability (190 mAh·g?1 at 10 C). These favorable properties suggest that the NDPC can be a promising anode material for lithium ion batteries (LIBs). 相似文献
4.
Andrzej Lewandowski Agnieszka Swiderska-Mocek Ewelina Rudnicka Paweł Jakobczyk 《Journal of Solid State Electrochemistry》2014,18(10):2781-2788
The graphene anode was investigated in an ionic liquid electrolyte (0.7 M lithium bis(trifluoromethanesulfonyl)imide (LiNTf2)) in room temperature ionic liquid (N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (MPPyrNTf2)). SEM and TEM images suggested that the electrochemical intercalation/deintercalation process in the ionic liquid electrolyte without vinylene carbonate (VC) leads to small changes on the surface of graphene particles. However, a similar process in the presence of VC results in the formation of a coating (SEI—solid electrolyte interface) on the graphene surface. During charging/discharging tests, the graphene electrode working together with the 0.7 M LiNTf2 in MPPyrNTf2 electrolyte lost its capacity, during cycling and stabilizes at ca. 200 mAh g?1 after 20 cycles. The addition of VC to the electrolyte (0.7 M LiNTf2 in MPPyrNTf2?+?10 wt.% VC) considerably increases the anode capacity. Electrodes were tested at different current regimes: ranging between 50 and 1,000 mA g?1. The capacity of the anode, working at a low current regime of 50 mA g?1, was ca. 1,250 mAh g?1, while the current of 500 mA g?1 resulted in capacity of 350 mAh g?1. Coulombic efficiency was stable and close to 95 % during ca. 250 cycles. The exchange current density, obtained from impedance spectroscopy, was 1.3?×?10?7 A cm?2 (at 298 K). The effect of the anode capacity decrease with increasing current rate was interpreted as the result of kinetic limits of the electrode operation. 相似文献
5.
Dona Susan Baji Shantikumar V. Nair Alok Kumar Rai 《Journal of Solid State Electrochemistry》2017,21(10):2869-2875
A novel disk-like shape of Co3O4 with high porosity was synthesized by a facile hydrothermal approach followed by calcination at 485 °C for 2 h. In order to further confirm the crystal structure, morphology, particle size, surface area, and porosity of the sample, a series of corresponding characterization techniques were used. The disk-like shape of Co3O4 as an anode delivered excellent rate capability such as 510.5 mAh g?1 at 4.0 C, which is much higher than the theoretical capacity of commercial graphite anode (372 mAh g?1). However, the electrode could not recover the high capacity during the long-term cycling at various higher current rates due to the deformation of the structure as confirmed by the ex situ studies. It is believed that the obtained remarkable structural feature with numerous void pores within the structure may be helpful for short-term cycling due to the large contact areas between the electrode and the electrolyte and a shorter diffusion length for lithium ion insertion but unable to act as a buffer to relax the volume expansion/contraction and alleviate the structural damage of the electrode during long-term cycling. 相似文献
6.
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
7.
Hongdong Liu Jiamu Huang Xinlu Li Jia Liu Yuxin Zhang 《Journal of Sol-Gel Science and Technology》2012,63(3):569-572
In this work, flower-like SnO2/carbon nanotubes (CNTs) composite was synthesized by one-step hydrothermal method for high-capacity lithium storage. The microstructures of products were characterized by XRD, FESEM and TEM. The electrochemical performance of the flower-like SnO2/CNTs composite was measured by cyclic voltammetry and galvanostatic charge/discharge cycling. The results show that the flower-like SnO2/CNTs composite displays superior Li-battery performance with large reversible capacity and high rate capability. The first discharge and charge capacities are 1,230 and 842 mAh g?1, respectively. After 40 cycles, the reversible discharge capacity is still maintained at 577 mAh g?1 at the current densities of 50, 100 and 500 mA g?1, indicating that it’s a promising anode material for high performance lithium-ion batteries. 相似文献
8.
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
9.
Li-Na Xiao Xiang Ding Zhong-Feng Tang Xiao-Dong He Jia-Ying Liao Yan-Hua Cui Chun-Hua Chen 《Journal of Solid State Electrochemistry》2018,22(11):3431-3442
LiNi0.80Co0.15Al0.05O2 (NCA) is explored to be applied in a hybrid Li+/Na+ battery for the first time. The cell is constructed with NCA as the positive electrode, sodium metal as the negative electrode, and 1 M NaClO4 solution as the electrolyte. It is found that during electrochemical cycling both Na+ and Li+ ions are reversibly intercalated into/de-intercalated from NCA crystal lattice. The detailed electrochemical process is systematically investigated by inductively coupled plasma-optical emission spectrometry, ex situ X-ray diffraction, scanning electron microscopy, cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy. The NCA cathode can deliver initially a high capacity up to 174 mAh g?1 and 95% coulombic efficiency under 0.1 C (1 C?=?120 mA g?1) current rate between 1.5–4.1 V. It also shows excellent rate capability that reaches 92 mAh g?1 at 10 C. Furthermore, this hybrid battery displays superior long-term cycle life with a capacity retention of 81% after 300 cycles in the voltage range from 2.0 to 4.0 V, offering a promising application in energy storage. 相似文献
10.
Xiaoxuan Ma Na Li Shikun Liu Kun Zhang Caixia Chi Jiupeng Zhao Xiaoxu Liu Yao Li 《Journal of Solid State Electrochemistry》2018,22(9):2801-2809
In this work, a novel pyrrolic nitrogen-doped carbon sandwiched monolayer MoS2 hybrid was prepared. This sandwiched hybrid vertically anchors on graphene oxide as anode materials for sodium-ion batteries. Such electrode was fabricated by facile ionic liquid-assisted reflux and annealing methods. Owing to rational structure and enhancement from pyrrolic nitrogen dopant, this unique MoS2/C-graphene hybrid exhibits reversible specific capacity of 486 mAh g?1 after 1000 cycles with a low average fading capacity of 0.15 mAh g?1 (fading cyclic rate of ca. 0.03% per cycle). A capacity of 330 mAh g?1 is remained at the current densities of 10.0 A g?1. The proposed strategy provides a convenient way to create new pyrrolic nitrogen-doped hybrids for energy field and other related applications. 相似文献
11.
One‐Pot Fabrication of Hierarchical Nanosheet‐Based TiO2–Carbon Hollow Microspheres for Anode Materials of High‐Rate Lithium‐Ion Batteries
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Zhaokui Jin Prof. Mu Yang Jingjing Wang Hongyi Gao Prof. Yunfeng Lu Prof. Ge Wang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(17):6031-6036
Hierarchical and hollow nanostructures have recently attracted considerable attention because of their fantastic architectures and tunable property for facile lithium ion insertion and good cycling stability. In this study, a one‐pot and unusual carving protocol is demonstrated for engineering hollow structures with a porous shell. Hierarchical TiO2 hollow spheres with nanosheet‐assembled shells (TiO2 NHS) were synthesized by the sequestration between the titanium source and 2,2′‐bipyridine‐5,5′‐dicarboxylic acid, and kinetically controlled etching in trifluoroacetic acid medium. In addition, annealing such porous nanostructures presents the advantage of imparting carbon‐doped functional performance to its counterpart under different atmospheres. Such highly porous structures endow very large specifics surface area of 404 m2 g?1 and 336 m2 g?1 for the as‐prepared and calcination under nitrogen gas. C/TiO2 NHS has high capacity of 204 mA h g?1 at 1 C and a reversible capacity of 105 mA h g?1 at a high rate of 20 C, and exhibits good cycling stability and superior rate capability as an anode material for lithium‐ion batteries. 相似文献
12.
Tirupathi Rao Penki D. Shanmughasundaram N. Munichandraiah 《Journal of Solid State Electrochemistry》2013,17(12):3125-3136
Lithium-rich manganese oxide (Li2MnO3) is prepared by reverse microemulsion method employing Pluronic acid (P123) as a soft template and studied as a positive electrode material. The as-prepared sample possesses good crystalline structure with a broadly distributed mesoporosity but low surface area. As expected, cyclic voltammetry and charge–discharge data indicate poor electrochemical activity. However, the sample gains surface area with narrowly distributed mesoporosity and also electrochemical activity after treating in 4 M H2SO4. A discharge capacity of about 160 mAh g?1 is obtained. When the acid-treated sample is heated at 300 °C, the resulting porous sample with a large surface area and dual porosity provides a discharge capacity of 240 mAh g?1. The rate capability study suggests that the sample provides about 150 mAh g?1 at a specific discharge current of 1.25 A g?1. Although the cycling stability is poor, the high rate capability is attributed to porous nature of the material. 相似文献
13.
Lu Yue Haoxiang Zhong Daoping Tang Lingzhi Zhang 《Journal of Solid State Electrochemistry》2013,17(4):961-968
A novel porous Si/S-doped carbon composite was prepared by a magnesiothermic reaction of mesoporous SiO2, subsequently coating with a sulfur-containing polymer-poly(3,4-ethylene dioxythiophene), and a post-carbonization process. The as-prepared Si composite was homogeneously coated with disordered S-doped carbon with 2.6 wt.%?S in the composite and retained a high surface area of 58.8 m2?g?1. The Si/S-doped carbon composite exhibited superior electrochemical performance and long cycle life as an anode material in lithium ion cells, showing a stable reversible capacity of 450 mAh g?1 even at a high current rate of 6,000 mA?g?1. 相似文献
14.
Nb2O5-carbon nanocomposite is synthesized through a facile one-step hydrothermal reaction from sucrose as the carbon source, and studied as an anode material for high-performance lithium ion battery. The structural characterizations reveal that the nanocomposite possesses a core-shell structure with a thin layer of carbon shell homogeneously coated on the Nb2O5 nanocrystals. Such a unique structure enables the composite electrode with a long cycle life by preventing the Nb2O5 from volume change and pulverization during the charge-discharge process. In addition, the carbon shell efficiently improves the rate capability. Even at a current density of 500 mA·g?1, the composite electrode still exhibits a specific capacity of ~100 mAh·g?1. These results suggest the possibility to utilize the Nb2O5-carbon core-shell composite as a high performance anode material in the practical application of lithium ion battery. 相似文献
15.
Fengliu Lou Haitao Zhou Fride Vullum-Bruer Trung Dung Tran De Chen 《Journal of Energy Chemistry》2013,22(1):78-86
A 3D structured composite of carbon nanofibers@MnO2 on copper foil is reported here as a binder free anode of lithium ion batteries, with high capacity, fast charge/discharge rate and good stability. Carbon nanofiber yarns were synthesized directly over copper foil through a floating catalyst method. The growth of carbon nanofiber yarns was significantly enhanced by mechanical polishing of the copper foils, which can be attributed to the increased surface roughness and surface area of the copper foils. MnO2 was then grown over carbon nanofibers through spontaneous reduction of potassium permanganate by the carbon nanofibers. The obtained composites of carbon nanofibers@MnO2 over copper foil were tested as an anode in lithium ion batteries and they show superior electrochemical performance. The initial reversible capacity of carbon nanofibers@MnO2 reaches up to around 998 mAh·g?1 at a rate of 60 mmA·g?1 based on the mass of carbon nanofibers and MnO2. The carbon nanofibers@MnO2 electrodes could deliver a capacity of 630 mAh·g?1 at the beginning and maintain a capacity of 440 mmAh·g?1 after 105 cycles at a rate of 600 mA·g?1. The high initial capacity can be attributed to the presence of porous carbon nanofiber yarns which have good electrical conductivity and the MnO2 thin film which makes the entire materials electrochemically active. The high cyclic stability of carbon nanofibers@MnO2 can be ascribed to the MnO2 thin film which can accommodate the volume expansion and shrinking during charge and discharge and the good contact of carbon nanofibers with MnO2 and copper foil. 相似文献
16.
Lithium garnet based free-standing solid polymer composite membrane for rechargeable lithium battery
Electrolytes with high lithium-ion conductivity, better mechanical strength and large electrochemical window are essential for the realization of high-energy density lithium batteries. Polymer electrolytes are gaining interest due to their inherent flexibility and nonflammability over conventional liquid electrolytes. In this work, lithium garnet composite polymer electrolyte membrane (GCPEM) consisting of large molecular weight (Wavg ~?5?×?106) polyethylene oxide (PEO) complexed with lithium perchlorate (LiClO4) and lithium garnet oxide Li6.28Al0.24La3Zr2O12 (Al-LLZO) is prepared by solution-casting method. Significant improvement in Li+ conductivity for Al-LLZO containing GCPEM is observed compared with the Al-LLZO free polymer membrane. Maximized room temperature (30 °C) Li+ conductivity of 4.40?×?10?4 S cm?1 and wide electrochemical window (4.5 V) is observed for PEO8/LiClO4?+?20 wt% Al-LLZO (GCPEM-20) membrane. The fabricated cell with LiCoO2 as cathode, metallic lithium as anode and GCPEM-20 as electrolyte membrane delivers an initial charge/discharge capacity of 146 mAh g?1/142 mAh g?1 at 25 °C with 0.06 C-rate. 相似文献
17.
The hierarchical porous nitrogen‐doped carbon materials (HNCs) were prepared by using nitrogen containing gelatin as the carbon source and nano‐silica obtained by a simple flame synthesis approach as the template. All of the as‐obtained HNCs show much higher Li storage capacity as compared with commercial graphite. Specifically, HNC‐700 with biggest micropore volume and highest nitrogen content exhibited optimal reversible capacities of 1084 mAh·g??1 at the current density of 37.2 mA·g?1 (0.1 C) and 309 mAh·g?1 even at 3.72 A·g?1 (10 C). This result suggests that HNCs should be a promising candidate for anode materials in high‐rate lithium ion batteries (LIBs). 相似文献
18.
Kai Zhang Furong Qin Jing Fang Qiang Li Ming Jia Yanqing Lai Zhian Zhang Jie Li 《Journal of Solid State Electrochemistry》2014,18(4):1025-1029
In this report, a porous, electronically conductive nickel foam foil (NFF), which is rolled for smooth surface, is introduced as an interlayer placed between the sulfur electrode and the separator to suppress the loss of active material and self-discharge behavior in lithium–sulfur (Li–S) systems. The electrodes are characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge test. The cell with the rolled NFF interlayer shows superior performance in terms of capacity utilization, reversibility, and enhanced rate capability. It exhibits reversible discharge capacity of 604 mAh g?1 after 80 cycles at 0.2 C, which is much higher than that of pristine sulfur without NFF (424 mAh g?1). The improvement on electrochemical performance is attributed to the 3D architecture of nickel foam foil as lithium–sulfur batteries interlayer, which can provide a good conductive network with structural stability and the porous architecture accommodating the migrating polysulfide to reduce the shuttling phenomenon during the charge–discharge processes. 相似文献
19.
Lei Qiu Ziqiang Shao Mingshan Yang Wenjun Wang Feijun Wang Junling Wan Jianquan Wang Yudong Bi Hongtao Duan 《Cellulose (London, England)》2014,21(1):615-626
This study, for the first time, synthesized carboxymethyl cellulose lithium (CMC-Li) by a two-step method and applied it to modified electrode material by electrospinning and as a binder on a lithium ion battery. By electrospinning, nano CMC-Li fiber and CMC-Li/9, 10-anthraquinone (AQ) composite fiber were obtained successfully and coated AQ electrode material. AQ was uniformly distributed in fibers, and then CMC-Li/AQ composite fiber was carbonized to obtain the carbon nanofiber/AQ/Li [CAL] composite as lithium battery anode material. Also for the first time we investigated substituting aqueous CMC-Li with different degrees of substitution (DS) for oily polyvinylidene fluoride (PVDF) as a lithium battery binder to assemble the battery with CAL for electrochemical performance tests. Compared with PVDF binder, cells with CMC-Li for a binder have excellent advantages, such as higher discharge capacity (226.4 mAh g?1), safer cycle performance, lower cost and being more eco-friendly. Furthermore, the cell with CMC-Li with high DS performed better than the cell with low DS. This method also applies to other electrode materials. 相似文献
20.
Shaofeng Jiang Zhian Zhang Yaohui Qu Xiwen Wang Qiang Li Yanqing Lai Jie Li 《Journal of Solid State Electrochemistry》2014,18(2):545-551
Activated carbon aerogels (ACAs) with high bimodal porosity were obtained for lithium/sulfur batteries by potassium hydroxide (KOH) activation. Then sulfur–activated carbon aerogels (S–ACAs) composites were synthesized by chemical deposition strategy. The S–ACAs composites were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy, and N2 adsorption/desorption measurements. It is found that the activated carbon aerogels treated by KOH activation presents a porous structure, and sulfur is embedded into the pores of the ACAs network-like matrix after a chemical deposition process. The Li/S–ACAs (with 69.1 wt% active material) composite cathode exhibits discharge capacities of 1,493 mAh g?1 in the first cycle and 528 mAh g?1 after 100 cycles at a higher rate of C/5 (335 mA g?1). The S–ACAs composite cathode exhibits better electrochemical reversibility, higher active material utilization, and less severe polysulfide shuttle than S–CAs composite cathode because of high bimodal porosity structure of the ACAs matrix. 相似文献