Mesoporous orthorhombic Nb2O5 nanofibers as pseudocapacitive electrodes with ultra-stable Li storage characteristics

Cheong, Jun Young; Jung, Ji‐Won; Youn, Doo-Young; Kim, Chanhoon; Yu, Sunmoon; Cho, Su‐Ho; Yoon, Ki Ro; Kim, Il‐Doo

doi:10.1016/j.jpowsour.2017.06.030

Cited by 77 publications

(43 citation statements)

References 36 publications

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“…By using superior and suitable binder agent might be expected to improve the mass loading. Kim et al used the poly(acrylic acid) and sodium carboxymethyl cellulose as the binder agent instead of PVDF to prepare the mixed slurry . The electrode can perform superior rate and cycling performances as the mass loading is 1.5 mg cm −2 .…”

Section: Nb2o5 Electrodesmentioning

confidence: 99%

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Deng

Zhu

et al. 2019

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Niobium‐based oxides including Nb2O5, TiNbxO2+2.5x compounds, M–Nb–O (M = Cr, Ga, Fe, Zr, Mg, etc.) family, etc., as the unique structural merit (e.g., quasi‐2D network for Li‐ion incorporation, open and stable Wadsley– Roth shear crystal structure), are of great interest for applications in energy storage systems such as Li/Na‐ion batteries and hybrid supercapacitors. Most of these Nb‐based oxides show high operating voltage (>1.0 V vs Li+/Li) that can suppress the formation of solid electrolyte interface film and lithium dendrites, ensuring the safety of working batteries. Outstanding rate capability is impressive, which can be derived from their fast intercalation pseudocapacitive kinetics. However, the intrinsic poor electrical conductivity hinders their energy storage applications. Various strategies including structure optimization, surface engineering, and carbon modification are effectively used to overcome the issues. This review provides a comprehensive summary on the latest progress of Nb‐based oxides for advanced electrochemical energy storage applications. Major impactful work is outlined, promising research directions, and various performance‐optimizing strategies, as well as the energy storage mechanisms investigated by combining theoretical calculations and various electrochemical characterization techniques. In addition, challenges and perspectives for future research and commercial applications are also presented.

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Section: Nb2o5 Electrodesmentioning

confidence: 99%

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Deng

Zhu

et al. 2019

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“…Decreasing the size to the nanoscale leads to short diffusion paths for ions and electron transport, which can lead to increased power and fast charging in batteries . Therefore, several types of Nb 2 O 5 nanostructures have been investigated, including nanowires, nanorod films, nanofibers, and nanosheets . Nevertheless, the synthesis of small nanocrystals (NCs) with sizes below 10 nm remains challenging because the orthorhombic phase is obtained by thermal treatment at temperatures above ≈600 °C .…”

Section: Introductionmentioning

confidence: 99%

“…[7] Nanostructuring is a strategy commonly used to improve the capacity and rate capability of electrode materials. [26] Therefore, several types of Nb 2 O 5 nanostructures have been investigated, including nanowires, [17,27] nanorod films, [28] nanofibers, [29] and nanosheets. [26] Therefore, several types of Nb 2 O 5 nanostructures have been investigated, including nanowires, [17,27] nanorod films, [28] nanofibers, [29] and nanosheets.…”

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confidence: 99%

Exploiting the Condensation Reactions of Acetophenone to Engineer Carbon‐Encapsulated Nb₂O₅ Nanocrystals for High‐Performance Li and Na Energy Storage Systems

Han

Russo

Goubard‐Bretesché

et al. 2019

Advanced Energy Materials

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Energy storage technologies such as lithium-ion batteries (LIBs) and electrochemical capacitors (ECs) are currently the focus of intense research for applications that include electronic devices and electric vehicles. [1][2][3] Owing to the different energy storage mechanisms, batteries are able to deliver high energy density, while ECs have comparatively lower energy density but higher power density and longer cycling stability. [4][5][6] The expected technological advancements and increase in global energy consumption over the next decades will require energy storage devices with higher power densities, large capacities, and longer lifespans, compared to those currently available.Nonaqueous hybrid supercapacitors (HSCs), which generally consist of a battery-type anode (e.g., LIB) and an EC cathode in order to combine the advantages of both system storage mechanisms, are promising energy storage systems to meet future energy demands. [7][8][9] HSCs cathode materials are typically high surface area carbons, with the charge stored at the interface between the electrode and liquid electrolyte, and show high power density, high rate capability, and cycling stability. [10,11] At the battery-type anode, charges are usually stored through a Li + intercalation mechanism. [12] Therefore, the rate performance of HSCs is limited by the slow kinetics of lithium diffusion in the solid, as the surface adsorption-desorption processes at the cathode are considerably faster than the Faradaic reactions that take place at the anode. [13,14] Several materials, including Nb 2 O 5 , [15][16][17] Li 4 Ti 5 O 12 , [18] TiO 2 , [19] V 2 O 5 , [20] VN, [21] and MnO, [22] are being investigated as anodes to fabricate HSCs. In particular, Nb 2 O 5 shows promise due to its high theoretical specific capacity (≈200 mAh g −1 ), fast Li ions' diffusion, and good cycling stability. [23] Despite the charge storage deriving from the insertion of Li ions into the structure, the electrochemical behavior of Nb 2 O 5 is similar to that of a pseudocapacitive material. This mechanism has been named intercalation pseudocapacitance, and it is characterized by fast Faradaic processes occurring during ion insertion-deinsertion into the host material. [8] It has been demonstrated that the performance of Nb 2 O 5 strongly Efficient synthetic methods to produce high-performance electrode-active materials are crucial for developing energy storage devices for large-scale applications, such as hybrid supercapacitors (HSCs). Here, an effective approach to obtain controllable carbon-encapsulated T-Nb 2 O 5 nanocrystals (NCs) is presented, based on the solvothermal treatment of NbCl 5 in acetophenone. Two separate condensation reactions of acetophenone generate an intimate and homogeneous mixture of Nb 2 O 5 particles and 1,3,5-triphenylbenzene (TPB), which acts as a unique carbon precursor. The electrochemical performance of the resulting composites as anode electrode materials can be tuned by varying the Nb 2 O 5 /TPB ratio. Remarkable performances are achieved fo...

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“…At high current density of 20 C, the capacity T−Nb 2 O 5 /YbNbO x still maintained at 124 mAh g −1 , while for T−Nb 2 O 5 , the capacity was only 76 mAh g −1 . Benefiting from free of carbon materials, the volumetric capacity of T−Nb 2 O 5 /YbNbO x at 20 C reached 132 mAh cm −3 considering the loading mass (2 mg cm −2 ) and tap density (1.06 g cm −3 ) of the material, which is among the highest values in reported Nb 2 O 5 electrodes without carbon coating, and even close to that of Nb 18 W 16 O 93 and Nb 16 W 5 O 55 (150 and 128 mAh g −1 ), a kind of recently reported high energy density niobium based electrode material (Table S1) . The rate retention of T−Nb 2 O 5 /YbNbO x under 1 C and 20 C was 80 %, similar to that of Nb 18 W 16 O 93 (78 %) and Nb 16 W 5 O 55 (80 %) under same potential window of 3.0–1.2 V .…”

Section: Figurementioning

confidence: 61%

Enhancing the Rate Capability of Niobium Oxide Electrode through Rare‐Earth Doping Engineering

Yin

Zhao

et al. 2019

Batteries & Supercaps

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Niobium oxide is considered one of the most promising electrode materials for ultrafast electrochemical energy storage devices with high energy density. In this work, we first found that trace amounts (< 1 %) of Yb 3 + doping remarkably enhanced the rate capability of TÀ Nb 2 O 5 , which was further proved to be because of the formation of a thin layer of amorphous YbNbO x . The capacity of YbNbO x -coated Nb 2 O 5 reached 124 mAh g À 1 at 20 C, which is the highest value reported among pristine Nb 2 O 5 electrodes. Besides, we found that doping with other rare-earth elements such as Nd 3 + , Sm 3 + , and Gd 3 + can also improve the rate capability of TÀ Nb 2 O 5 . It can be concluded that rare-earth doping can be an effective and robust method to enhance the intrinsic rate performance of electrode materials without complicated modifications.

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Mesoporous orthorhombic Nb2O5 nanofibers as pseudocapacitive electrodes with ultra-stable Li storage characteristics

Cited by 77 publications

References 36 publications

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Exploiting the Condensation Reactions of Acetophenone to Engineer Carbon‐Encapsulated Nb₂O₅ Nanocrystals for High‐Performance Li and Na Energy Storage Systems

Enhancing the Rate Capability of Niobium Oxide Electrode through Rare‐Earth Doping Engineering

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Mesoporous orthorhombic Nb2O5 nanofibers as pseudocapacitive electrodes with ultra-stable Li storage characteristics

Cited by 77 publications

References 36 publications

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Niobium‐Based Oxides Toward Advanced Electrochemical Energy Storage: Recent Advances and Challenges

Exploiting the Condensation Reactions of Acetophenone to Engineer Carbon‐Encapsulated Nb2O5 Nanocrystals for High‐Performance Li and Na Energy Storage Systems

Enhancing the Rate Capability of Niobium Oxide Electrode through Rare‐Earth Doping Engineering

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Exploiting the Condensation Reactions of Acetophenone to Engineer Carbon‐Encapsulated Nb₂O₅ Nanocrystals for High‐Performance Li and Na Energy Storage Systems