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1.
    
Secondary charge batteries have captured numerous attentions, owing to their abundant raw, portability, and high energy density. As the main ions‐storage carrier, the electrode materials serve vital roles on the properties of whole battery system. Currently, MoSe2 is regarded as rising star of transition metal dichalcogenides, displaying unique layered structure, high electronic conductivity, as well as narrow energy band. These advantages enable their widely application on hydrogen evolution reactions and solar cells. Recently, a plenty of researching activities on MoSe2/carbon are triggered due to large interplanar spacing and high ions/e− migration rate. In this review, the recent achievements of diverse MoSe2/carbon on great energy‐storage domains are solidly summarized from bonding types (surface‐loading, internal‐wrapped) and dimensional controlling (1D nanotubes/nanofibers, 2D graphene/nanosheets, 3D carbon framework/sphere). Meanwhile, the related Li/Na ions‐storage mechanisms are also concluded. Furthermore, for MoSe2/carbon with better electrochemical properties, the opportunities and perspectives in the future are also suggested. This review throws light on the systematic developments of advanced MoSe2/carbon, and confirms its exploring potential on lithium‐ion batteries/sodium‐ion batteries.  相似文献   

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Harvesting energy from natural resources is of significant interest because of their abundance and sustainability. Seawater is the most abundant natural resource on earth, covering two‐thirds of the surface. The rechargeable seawater battery is a new energy storage platform that enables interconversion of electrical energy and chemical energy by tapping into seawater as an infinite medium. Here, an overview of the research and development activities of seawater batteries toward practical applications is presented. Seawater batteries consist of anode and cathode compartments that are separated by a Na‐ion conducting membrane, which allows only Na+ ion transport between the two electrodes. The roles and drawbacks of the three key components, as well as the development concept and operation principles of the batteries on the basis of previous reports are covered. Moreover, the prototype manufacturing lines for mass production and automation, and potential applications, particularly in marine environments are introduced. Highlighting the importance of engineering the cell components, as well as optimizing the system level for a particular application and thereby successful market entry, the key issues to be resolved are discussed, so that the seawater battery can emerge as a promising alternative to existing rechargeable batteries.  相似文献   

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Bismuth has emerged as a promising anode material for sodium‐ion batteries (SIBs), owing to its high capacity and suitable operating potential. However, large volume changes during alloying/dealloying processes lead to poor cycling performance. Herein, bismuth nanoparticle@carbon (Bi@C) composite is prepared via a facile annealing method using a commercial coordination compound precursor of bismuth citrate. The composite has a uniform structure with Bi nanoparticles embedded within a carbon framework. The nanosized structure ensures a fast kinetics and efficient alleviation of stress/strain caused by the volume change, and the resilient and conductive carbon matrix provides an interconnected electron transportation pathway. The Bi@C composite delivers outstanding sodium‐storage performance with an ultralong cycle life of 30 000 cycles at a high current density of 8 A g?1 and an excellent rate capability of 71% capacity retention at an ultrahigh current rate of 60 A g?1. Even at a high mass loading of 11.5 mg cm?2, a stable reversible capacity of 280 mA h g?1 can be obtained after 200 cycles. More importantly, full SIBs by pairing with a Na3V2(PO4)3 cathode demonstrates superior performance. Combining the facile synthesis and the commercial precursor, the exceptional performance makes the Bi@C composite very promising for practical large‐scale applications.  相似文献   

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A MoS2@C nanotube composite is prepared through a facile hydrothermal method, in which the MoS2 nanotube and amorphous carbon are generated synchronically. When evaluated as an anode material for lithium ion batteries (LIB), the MoS2@C nanotube manifests an enhanced capacity of 1327 mA h g?1 at 0.1 C with high initial Coulombic efficiency (ICE) of 92% and with capacity retention of 1058.4 mA h g?1 (90% initial capacity retention) after 300 cycles at a rate of 0.5 C. A superior rate capacity of 850 mA h g?1 at 5 C is also obtained. As for sodium ion batteries, a specific capacity of 480 mA h g?1 at 0.5 C is achieved after 200 cycles. The synchronically formed carbon and stable hollow structure lead to the long cycle stability, high ICE, and superior rate capability. The good electrochemical behavior of MoS2@C nanotube composite suggests its potential application in high‐energy LIB.  相似文献   

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Alloying‐type materials are promising anodes for high‐performance sodium‐ion batteries (SIBs) because of their high capacities and low Na‐ion insertion potentials. However, the typical candidates, such as P, Sn, Sb, and Pb, suffer from severe volume changes (≈293–487%) during the electrochemical reactions, leading to inferior cycling performances. Here, a high‐rate and ultrastable alloying‐type anode based on the rolled‐up amorphous Si nanomembranes is demonstrated. The rolled‐up amorphous Si nanomembranes show a very small volume change during the sodiation/desodiation processes and deliver an excellent rate capability and ultralong cycle life up to 2000 cycles with 85% capacity retention. The structural evolution and pseudocapacitance contribution are investigated by using the ex situ characterization techniques combined with kinetics analysis. Furthermore, the mechanism of efficient sodium‐ion storage in amorphous Si is kinetically analyzed through an illustrative atomic structure with dangling bonds, offering a new perspective on understanding the sodium storage behavior. These results suggest that nanostructured amorphous Si is a promising anode material for high‐performance SIBs.  相似文献   

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A hybrid nanostructure with Co0.85Se nanoparticles anchored in nitrogen‐doped hollow mesoporous carbon nanospheres/carbon nanotubes (Co0.85Se/N‐HMCNs/CNTs) is elaborately fabricated by a pyrolysis–reduction–selenization strategy derived from yolk–shell zeolitic imidazolate framework‐67 (ZIF‐67)@HMCNs, which are synthesized by the confined growth of ZIF‐67 inside HMCNs regarded as nanoreactors. Benefitting from the robust hollow carbon frameworks made of nitrogen‐doped hollow mesoporous carbon nanospheres, carbon nanotubes, and highly active Co0.85Se ultrafine nanoparticles, the as‐prepared nanocomposites show greatly enhanced lithium/sodium storage properties. When the Co0.85Se/N‐HMCNs/CNTs are applied to lithium‐ion batteries as anode materials, the advanced nanocomposite delivers excellent cycling stability (286 and 153 mA h g−1 at 10 A g−1 after 5000 and 10 000 cycles) and high rate performance (501 mA h g−1 at 5 A g−1). When the Co0.85Se/N‐HMCNs/CNTs are applied to sodium‐ion batteries as anode materials, the material realizes better cycling performance (102 mA h g−1 at 1 A g−1 after 1000 cycles) and excellent rate performance (132 mA h g−1 at 5 A g−1).  相似文献   

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Highly ordered mesoporous cobalt oxide (m‐Co3O4) has been synthesized and applied as an electroactive material in sodium‐ion battery anodes. Mesoporous silica was used as the template for the generation of dual porosity cobalt oxide with spherical mesopores and porous nanochannels. The most notable feature of our dual porosity mesoporous Co3O4 is that the highly ordered structure can provide much better transport pathways than the reference bulk Co3O4 derived nanostructure, because it can facilitate the mass transport of electrolyte in the larger pores and sodium ion diffusion in the smaller pores, and also provide a large electrode–electrolyte interface for electrolyte adsorption due to the surface disorder of the Co3O4. The outstanding dual porosity mesopores in the cobalt oxide allow better transport pathways and thus lead to an initial capacity of 707 mA h g−1 at a current density of 90 mA g−1, retaining a capacity of 416 mA h g−1 after 100 cycles. The sodium uptake/extraction is confirmed to take place through a reversible conversion reaction, based on ex situ characterization techniques, which identify dual porosity mesoporous Co3O4 as a high‐performance sodium‐ion battery anode material.  相似文献   

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Sodium‐ion batteries (SIBs) offer a promise of a scalable, low‐cost, and environmentally benign means of renewable energy storage. However, the low capacity and poor rate capability of anode materials present an unavoidable challenge. In this work, it is demonstrated that surface phosphorylated TiO2 nanotube arrays grown on Ti substrate can be efficient anode materials for SIBs. Fabrication of the phosphorylated nanoarray film is based on the electrochemical anodization of Ti metal in NH4F solution and subsequent phosphorylation using sodium hypophosphite. The phosphorylated TiO2 nanotube arrays afford a reversible capacity of 334 mA h g?1 at 67 mA g?1, a superior rate capability of 147 mA h g?1 at 3350 mA g?1, and a stable cycle performance up to 1000 cycles. In situ X‐ray diffraction and transmission electron microscopy reveal the near‐zero strain response and robust mechanical behavior of the TiO2 host upon (de)sodiation, suggesting its excellent structural stability in the Na+ storage application.  相似文献   

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Graphene is intensively investigated in various energy storage and conversion systems such as fuel cells, batteries, and supercapacitors. Despite the exponential increase of the number of publications related with graphene, the practical application of graphene in energy storage and conversion still has many uncertainties, but the reason is rarely mentioned in the literature. Here, the scientific gap between graphene research and the key parameters in Li‐ion batteries and beyond is discussed, such as the electrochemical window, the electrode surface area, and the parasitic weight. Different insights are provided for graphene study in batteries that may inspire new ideas to address the practical challenges for large‐scale adoption of graphene in energy storage.  相似文献   

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Self‐organized, anodically grown titanium dioxide (TiO2) nanotubes have been readily studied as anode material in various ion batteries. The simple way of nanostructuring via anodization of a Ti metal substrate and the fact that either their nanotubular morphology or bulk structure can be readily adjusted by changing the anodization and/or annealing conditions make them an attractive model anode material. This enables the investigation of different phenomena by selectively changing one specific parameter of the ion insertion mechanism. This review focuses on the recent progress in understanding the ion storage characteristics of anodic self‐organized TiO2 nanotubes in Li‐, Na‐, and Al‐ion batteries. Insights into the electrochemical behavior of the anode material as well as methodological approaches are highlighted.  相似文献   

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Grid‐scale energy storage batteries with electrode materials made from low‐cost, earth‐abundant elements are needed to meet the requirements of sustainable energy systems. Sodium‐ion batteries (SIBs) with iron‐based electrodes offer an attractive combination of low cost, plentiful structural diversity and high stability, making them ideal candidates for grid‐scale energy storage systems. Although various iron‐based cathode and anode materials have been synthesized and evaluated for sodium storage, further improvements are still required in terms of energy/power density and long cyclic stability for commercialization. In this Review, progress in iron‐based electrode materials for SIBs, including oxides, polyanions, ferrocyanides, and sulfides, is briefly summarized. In addition, the reaction mechanisms, electrochemical performance enhancements, structure–composition–performance relationships, merits and drawbacks of iron‐based electrode materials for SIBs are discussed. Such iron‐based electrode materials will be competitive and attractive electrodes for next‐generation energy storage devices.  相似文献   

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2D Sulfur‐doped TiSe2/Fe3O4 (named as S‐TiSe2/Fe3O4) heterostructures are synthesized successfully based on a facile oil phase process. The Fe3O4 nanoparticles, with an average size of 8 nm, grow uniformly on the surface of S‐doped TiSe2 (named as S‐TiSe2) nanoplates (300 nm in diameter and 15 nm in thickness). These heterostructures combine the advantages of both S‐TiSe2 with good electrical conductivity and Fe3O4 with high theoretical Li storage capacity. As demonstrated potential applications for energy storage, the S‐TiSe2/Fe3O4 heterostructures possess high reversible capacities (707.4 mAh g−1 at 0.1 A g−1 during the 100th cycle), excellent cycling stability (432.3 mAh g−1 after 200 cycles at 5 A g−1), and good rate capability (e.g., 301.7 mAh g−1 at 20 A g−1) in lithium‐ion batteries. As for sodium‐ion batteries, the S‐TiSe2/Fe3O4 heterostructures also maintain reversible capacities of 402.3 mAh g−1 at 0.1 A g−1 after 100 cycles, and a high rate capacity of 203.3 mAh g−1 at 4 A g−1.  相似文献   

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An effective, nondestructive, and universal strategy to homogeneously modify freestanding carbon nanotube (CNT) films with various active species is essential to achieve functional electrodes for flexible electrochemical energy storage, which is challenging and has attracted considerable research interest. In this work, a generalizable concept, to utilize silicon oxide as the intermediate to uniformly decorate various metal sulfide nanostructures throughout CNT films is reported. Taking nickel sulfide nanosheet/CNT (NS/CNT) films, in which the NS nanosheets are homogeneously attached on the intact few‐walled CNTs, as an example, the sheet‐like NS provides sufficient active sites for redox reactions and the CNT network acts as an efficient electron highway, maintaining the structural integrity of the composite and also buffering volume changes. These merits enable NS/CNT films to meet the requirements of versatile energy storage applications. When used for supercapacitors, a high specific capacitance (2699.7 F g?1/10 A g?1), outstanding rate performance at extremely high rates (1527 F g?1/250 A g?1), remarkable cycling stability, and excellent flexibility can be achieved, among the best performance so far. Moreover, it also delivers excellent performance in the storage of Li and Na ions, meaning it is also potentially suitable for Li/Na ion batteries.  相似文献   

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Popularization of portable electronics and electric vehicles worldwide stimulates the development of energy storage devices, such as batteries and supercapacitors, toward higher power density and energy density, which significantly depends upon the advancement of new materials used in these devices. Moreover, energy storage materials play a key role in efficient, clean, and versatile use of energy, and are crucial for the exploitation of renewable energy. Therefore, energy storage materials cover a wide range of materials and have been receiving intensive attention from research and development to industrialization. In this Review, firstly a general introduction is given to several typical energy storage systems, including thermal, mechanical, electromagnetic, hydrogen, and electrochemical energy storage. Then the current status of high‐performance hydrogen storage materials for on‐board applications and electrochemical energy storage materials for lithium‐ion batteries and supercapacitors is introduced in detail. The strategies for developing these advanced energy storage materials, including nanostructuring, nano‐/microcombination, hybridization, pore‐structure control, configuration design, surface modification, and composition optimization, are discussed. Finally, the future trends and prospects in the development of advanced energy storage materials are highlighted.  相似文献   

19.
    
Prussian blue (PB) and its analogues are recognized as promising cathodes for rechargeable batteries intended for application in low‐cost and large‐scale electric energy storage. With respect to PB cathodes, however, their intrinsic crystal regularity, vacancies, and coordinated water will lead to low specific capacity and poor rate performance, impeding their application. Herein, nanocubic porous NaxFeFe(CN)6 coated with polydopamine (PDA) as a coupling layer to improve its electrochemical performance is reported, inspired by the excellent adhesive property of PDA. As a cathode for sodium‐ion batteries, the NaxFeFe(CN)6 electrode coupled with PDA delivers a reversible capacity of 93.8 mA h g?1 after 500 cycles at 0.2 A g?1, and a discharge capacity of 72.6 mA h g?1 at 5.0 A g?1. The sodium storage mechanism of this NaxFeFe(CN)6 coupled with PDA is revealed via in situ Raman spectroscopy. The first‐principles computational results indicate that FeII sites in PB prefer to couple with the robust PDA layer to stabilize the PB structure. Moreover, the sodium‐ion migration in the PB structure is enhanced after coating with PDA, thus improving the sodium storage properties. Both experiments and computational simulations present guidelines for the rational design of nanomaterials as electrodes for energy storage devices.  相似文献   

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The large‐scale application of sodium/potassium‐ion batteries is severely limited by the low and slow charge storage dynamics of electrode materials. The crystalline carbons exhibit poor insertion capability of large Na+/K+ ions, which limits the storage capability of Na/K batteries. Herein, porous S and N co‐doped thin carbon (S/N@C) with shell‐like (shell size ≈20–30 nm, shell wall ≈8–10 nm) morphology for enhanced Na+/K+ storage is presented. Thanks to the hollow structure and thin shell‐wall, S/N@C exhibits an excellent Na+/K+ storage capability with fast mass transport at higher current densities, leading to limited compromise over charge storage at high charge/discharge rates. The S/N@C delivers a high reversible capacity of 448 mAh g‐1 for Na battery, at the current density of 100 mA g‐1 and maintains a discharge capacity up to 337 mAh g‐1 at 1000 mA g‐1. Owing to shortened diffusion pathways, S/N@C delivers an unprecedented discharge capacity of 204 and 169 mAh g‐1 at extremely high current densities of 16 000 and 32 000 mA g‐1, respectively, with excellent reversible capacity for 4500 cycles. Moreover, S/N@C exhibits high K+ storage capability (320 mAh g‐1 at current density of 50 mA g‐1) and excellent cyclic life.  相似文献   

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