Readily Exfoliated TiSe<sub>2</sub> Nanosheets for High‐Performance Sodium Storage

Zhang, Dan; Zhao, Guoqiang; Li, Peng; Qiu, Wenbin; Shu, Jie; Jiang, Yinzhu; Dou, Shi Xue; Sun, Wenping

doi:10.1002/chem.201704661

Cited by 44 publications

(26 citation statements)

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“…[ 23,25,30,31 ] In SIBs system, four oxidation peaks can be noticed in the first cycle at around 2.02, 2.08, 2.25, and 2.35 V, which represent Na‐extraction from the VS 2 host, while only two broad peaks are located at 1.96 and 1.56 V during the reduction process, corresponding to Na + insertion into the VS 2 cathode (Figure 2b). [ 26,32,33 ] In PIBs system, three cathodic peaks attributed to K + insertion are located at 2.20, 2.11, and 1.73 V, while three anodic peaks assigned to K + extraction are situated at 1.94, 2.32, and 2.91 V in the initial cycle (Figure 2c). [ 34 ] The discharge/charge curves of the VS 2 cathode consist of two discharge plateaus at 2.31 and 2.20 V, and four charge plateaus at around 2.23, 2.32, 2.41, and 2.48 V in LIBs (Figure 2d); two pairs of redox voltage plateaus at 2.11/1.63 and 2.30/1.90 V in SIBs (Figure 2e); two discharge voltage plateaus located at around 2.21 and 1.78 V and four charge voltage plateaus located at about 1.91, 2.47, 2.90, and 3.29 V in PIBs (Figure 2f).…”

Section: Resultsmentioning

confidence: 99%

Insights into the Storage Mechanism of Layered VS₂ Cathode in Alkali Metal‐Ion Batteries

Zhang

et al. 2020

Advanced Energy Materials

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great attention as alternatives to LIBs, in order to provide new opportunities for the substantial improvement of energy storage systems. [5][6][7][8][9][10][11][12] The alkali metals (Li, Na, and K) are located at the first group in the periodic table, possessing similar physicochemical properties. However, it is generally accepted that the larger cation radius of Na + (1.02 Å) and K + (1.33 Å) causes the sluggish diffusion kinetics, thus limiting the development of SIBs and PIBs. [6] Compared to the mature technology of LIBs, the developments of SIBs and PIBs are still at an initial stage.The common electrode materials in LIBs are generally not applicable to SIBs and PIBs. [13][14][15][16][17][18] Advanced electrode materials that can store large-sized Na + and K + are urgently desired. 2D layered transition metal dichalcogenides (TMDs), which are fundamentally and technically interesting, have been widely researched in energy storage field. [19][20][21] Vanadium disulfide (VS 2 ) is a typical family member of TMDs, which has attracted wide attention due to its layered structure with a large interlayer spacing of 0.57 nm together with excellent electric conductivity and weak van der Waals interlayer interaction. [22,23] The unique structure and properties of VS 2 make it an ideal host for the insertion/extraction of alkali metalions. Recently, the literature regarding the potential of VS 2 as an electrode for alkali metal-ion (Li + , Na + , and K + ) batteries with outstanding performance has been reported. [24][25][26][27][28][29] However, less attention has been paid to the relationship between the electrochemical performance and the storage mechanism in alkali metal-ion batteries. Revealing the detailed energy storage mechanisms, including the structural evolution, phase transition reactions, and ion diffusion kinetics, is highly significant for a deeper understanding of the electrochemistry about VS 2 and further optimization of its electrochemical performance in alkali metal-ion batteries.In this work, we systematically revealed and compared the electrochemical behaviors of the layered VS 2 cathode in three battery systems (LIBs, SIBs, and PIBs), including electrochemical performance, detailed structural evolution, and reaction kinetics during the alkali metal-ions insertion/extraction. In situ X-ray diffraction (XRD), ex situ transmission electron microscope (TEM), together with density functional theory (DFT) analysis were employed to accurately track the structural evolution of VS 2 during the discharging/charging processes, VS 2 is one of the attractive layered cathodes for alkali metal-ion batteries. However, the understanding of the detailed reaction processes and energy storage mechanism is still inadequate. Herein, the Li + /Na + /K + insertion/ extraction mechanisms of VS 2 cathode are elucidated on the basis of experimental analyses and theoretical simulations. It is found that the insertion/ extraction behavior of Li + is partially irreversible, while the insertion/extraction behavior of Na + /K...

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Section: Resultsmentioning

confidence: 99%

Insights into the Storage Mechanism of Layered VS₂ Cathode in Alkali Metal‐Ion Batteries

Zhang

et al. 2020

Advanced Energy Materials

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“…In addition, TiSe 2 is expected to have fast intercalation and deintercalation of alkali metal cations due to the larger interlayer spacing (0.601 nm) and better electronic conductivity compared with that of TiS 2 (0.569 nm). Zhang et al reported high‐performance SIBs based on TiSe 2 nanosheets via an exfoliation method. The TiSe 2 nanosheets exhibited a reversible capacity of 147 mAh g −1 with 0.1 A g −1 and showed an excellent rate capability (10 3 mAh g −1 ) at an ultrahigh current density of 10.0 A g −1 .…”

Section: Device Applicationsmentioning

confidence: 99%

2D Group IVB Transition Metal Dichalcogenides

Yan

Gong

Wangyang

et al. 2018

Adv Funct Materials

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Semiconductor technology is currently impaired by the surface dangling bond of materials, which introduces scattering and interface traps. 2D materials, especially transition metal dichalcogenides (TMDs) with different main groups, have settled this issue by utilizing unique atomically smooth surfaces and van der Waals (vdW) structures. Over the past few decades, many processes for exploring new materials, manipulating physical properties, and synthesizing single crystals have been developed. Among these 2D materials, group IVB TMDs are distinguished for their splendid physical properties, including ultrahigh mobility, charge density wave, superconducting transitions, etc. Here, the recent advances in group IVB TMDs are reviewed, which offer easy access to next generation nano-, opto-, thermal-electronic, energy storage and conversion applications. Both the advantages and challenges of these studies are summarized to further clarify existing problems.such as ZrSe 2 is up to 8000 µA µm −1 , which is 10 3 times higher than that of MoS 2 . [11] Group IVB TMDs are also promising thermoelectric materials for their enhanced thermoelectric performance with a high power factor such as TiS 2 . [12][13][14][15][16] These features indicate the great potential of group IVB TMDs for adoption into electronics. In addition, group IVB TMDs show fascinating electrochemical performances as hold materials [17][18][19] or electrodes [20,21] in catalysis [22,23] and batteries [24,25] (Figure 1). A breakthrough may be introduced in nanoelectronic and energy fields for ultrahigh performances and nontoxicity of 2D group IVB TMDs.In this review, we focus on the electronic structures of 1T-phase group IVB TMDs, the abundant properties of group IVB TMDs, and their applications in electronic devices. In particular, we start with the unique crystal structures and calculated electronic structures of 2D group IVB dichalcogenides. Then, the great properties and the current studies in electronic devices are reviewed with an emphasis on recently reported transistor and photodetectors based on group IVB TMD nanosheets. In the third part, the synthesis of group IVBs nanostructures is described. We review the current approaches for the isolation of ultrathin sheets and analyze the advantages and drawbacks of various preparation methods. At last, we present the challenges and future prospects of group IVB TMDs. Crystal and Electronic StructuresThe electronic structures of 2D TMDs strongly depend on their crystal structures and d-electron counts. Another crucial feature is the partially filled d bands of transition metals. Bulk TMDs are composed of ordered stacking monolayers connected by the weak van der Waals (vdW) interaction. This kind of layered material exists multifarious in polymorphs and commonly crystallize into three different structures in 1T, 2H, and 3R phases. For group IVB TMDs, 1T phase is more stable than 2H phase in reversal of group VIB TMDs due to their lower formation energies. [23] Figure 2a,b depicts the two typical structures o...

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“…Zhang 等 [30] 9) 图 3 (a) SnSe2/rGO 嵌钠过程结构演变示意图 [33] ； (b) SnSe/C 在不同电压下测试获得的非原位 XRD 曲线 [35] Figure 3 (a) Schematic diagram of the structure evolution of SnSe2/rGO during the insertion process [33] ; (b) Ex-situ XRD of SnSe/C under different voltages [35] 然而，SnSe 电极在循环过程中容易产生较大的体积膨胀，由此导致较弱的循环稳定性以及动力学问题。目前，通常通过结构构建以及与其他材料复合等方法进行改善。在结构构造方面，SnSe 纳米片最为常见，层状结构的 2D 电极材料在钠离子电池中具有巨大的应用潜力，Wang 等 [36] 利用新型胶体化学法，制备了 2D 超薄层状的 SnSe 纳米片，这种独特的结构可以实现钠离子电池中快速的离子及电子的传输，在 50 mA g -1 的电流密度下能够保持 463 mAh g -1 的容量。Yuan 等 [37] [44] [41] ; (c) TiSe2 的原位 XRD 测试 [44] 。 Figure 4 (a) Ex-situ XRD and (b) Ex-situ Raman test of WSe2 nanosheets [41] ; (c) In-situ XRD test of TiSe2 during the first two charge and discharge processes [44] .…”

Section: 引言unclassified

Research progress of metal selenides anode materials for sodium-ion batteries

Jia¹,

Tong²,

Jia³

2021

Sci. Sin.-Chim

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Sodium-ion battery has become the most likely new generation energy storage system to replace lithium-ion batteries because of their rich resources and environmental friendliness. However, the lack of anode materials with high capacity and long cycle stability has become the key to hindering the development of sodium-ion batteries. Metal selenides have the advantages of high theoretical capacity, high security and easy morphology design, and have gradually become potential alternative materials for the anode electrode of a new generation of sodium-ion batteries. However, the intrinsic conductivity of metal selenides is relatively low, resulting in poor cycle stability, which generally needs to be improved by morphology design, doping, or compounding. This article introduces the research progress in recent years of various metal selenides in sodium-ion batteries, focuses on the current problems and corresponding solutions, and looks forward to the development prospects of metal selenides in sodium-ion batteries.

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Readily Exfoliated TiSe₂ Nanosheets for High‐Performance Sodium Storage

Cited by 44 publications

References 44 publications

Insights into the Storage Mechanism of Layered VS₂ Cathode in Alkali Metal‐Ion Batteries

Insights into the Storage Mechanism of Layered VS₂ Cathode in Alkali Metal‐Ion Batteries

2D Group IVB Transition Metal Dichalcogenides

Research progress of metal selenides anode materials for sodium-ion batteries

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Readily Exfoliated TiSe2 Nanosheets for High‐Performance Sodium Storage

Cited by 44 publications

References 44 publications

Insights into the Storage Mechanism of Layered VS2 Cathode in Alkali Metal‐Ion Batteries

Insights into the Storage Mechanism of Layered VS2 Cathode in Alkali Metal‐Ion Batteries

2D Group IVB Transition Metal Dichalcogenides

Research progress of metal selenides anode materials for sodium-ion batteries

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Readily Exfoliated TiSe₂ Nanosheets for High‐Performance Sodium Storage

Insights into the Storage Mechanism of Layered VS₂ Cathode in Alkali Metal‐Ion Batteries

Insights into the Storage Mechanism of Layered VS₂ Cathode in Alkali Metal‐Ion Batteries