Pseudocapacitive titanium oxynitride mesoporous nanowires with iso-oriented nanocrystals for ultrahigh-rate sodium ion hybrid capacitors

Dong, Jun; Jiang, Yalong; Li, Qidong; Wei, Qiulong; Yang, Wei; Shi, Tan; Xu, Xu; An, Qinyou; Mai, Liqiang

doi:10.1039/c7ta00463j

Cited by 100 publications

(73 citation statements)

References 55 publications

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“…The energy density and power density values are calculated by integrating galvanostatic discharge curves and using the total mass of the two electrodes. The energy densities of the present quasi-solid-state NIC device are considerably higher than those values of the state-of-the-art reported NICs [23,[26][27][28][29][30][31][32][45][46][47] (Table S2, Supporting Information) and other energy storage systems such as lithium ion capacitors, [48][49][50] aqueous asymmetric SCs, [51,52] ionic liquid-based SCs, [33,53] and Ni/Fe batteries. Even at an extremely high power density of 48 kW kg −1 , the NIC can still deliver 49 W h kg −1 .…”

Section: Flexible Quasi-solid-state Hybrid Sodium-ion Capacitormentioning

confidence: 66%

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Chao

Wang

et al. 2018

Advanced Energy Materials

204

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storage device, lithium ion batteries can provide high energy but usually suffer from a low power rate and short life span. To overcome these drawbacks, researchers propose the so-called metal-ion capacitors, or hybrid batteries, which combine a battery anode and a capacitor electrode in order to achieve tradeoff between conventional battery and supercapacitor. [6][7][8] It is expected that such hybrid system delivers a capacitor-like fast charge/ discharge rate and battery-like high capacity. Since the first introduction in 2001, great progress has been achieved in the field of hybrid lithium-ion capacitors (LICs) through better understanding of the charge storage mechanism and the development of highperformance nanostructured materials. In a LIC, the capacitive cathode is typically a carbonaceous material that enables fast charge− discharge processes, while the reported battery-type anode includes Li 4 Ti 5 O 12 , [9,10] graphite, [11] TiO 2 , [12] MnO, [13] and LiVO 3 . [14] Sodium-ion batteries are becoming one of most promising battery technologies for the foreseeable grid-scale applications, because of more earth-abundant sodium source and their similar chemistry to that of the existing lithium-ion batteries. [15][16][17][18][19][20][21][22] Despite the potential low-cost, constructing hybrid sodium ion capacitors (NICs) faces more challenge because most Na host materials have a rather sluggish kinetic due to the large Na ion sizes. Research on NICs began in early 2012, [23] and was focused on improving the power capability of the anode in order to match the fast kinetics of the capacitive cathode. Strategies to increase sodium ion (Na + ) and electron (e − ) transport kinetics of NIC electrodes reported so far include: (1) developing new electrode materials (such as 2D MXene Ti 2 C, [24] V 2 C), [25] (2) constructing more conductive electrode structures by hybridizing with carbon (such as NaTi 2 (PO 4 ) 3 /rGO, [26] C@NVP, [27] Nb 2 O 5 @C/rGO, [28] TiO 2 mesocages@rGO, [29] and (3) shortening the ion diffusion and electron transport lengths by rational designing nanostructures (such as TiO 2 nanospheres, [30] Ti(O,N) nanowires, [31] Na 2 Ti 3 O 7 nanosheets [32] ). Despite these efforts, these reported anodes of NIC still have relatively limited rate performance and especially low Na-ion storage capacity. Among other reasons, most of these electrode materials are powder samples, which require substantial amount of conductive additives (such as super P, 10-20 wt%) and binder in order to make compact films. This not only weakens the electron transport but also unable to meet the flexibility requirement.Achieving high-performance Na-ion capacitors (NICs) has the particular challenge of matching both capacity and kinetics between the anode and cathode. Here a high-power NIC full device constructed from 2D metal-organic framework (MOFs) array is reported as the reactive template. The MOF array is converted to N-doped mesoporous carbon nanosheets (mp-CNSs), which are then uniformly encapsulated with VO 2 and Na...

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Section: Flexible Quasi-solid-state Hybrid Sodium-ion Capacitormentioning

confidence: 66%

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Chao

Wang

et al. 2018

Advanced Energy Materials

204

123

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“…After 1000 cycles at 2 A g −1 , the capacity retention is up to 90% (Figure f). Therefore, our GF/mCNF cathode has both high supercapacitive performance and excellent flexibility, which is apparently superior to most used commercial AC . According to the specific capacity and the potential window for m‐Nb 2 O 5 /CNF and GF/mCNF, the optimal mass ratio is m m‐Nb2O5/CNF / m GF@CNF = 1:3 according to the charge balance.…”

Section: Resultsmentioning

confidence: 97%

Mesopore‐Induced Ultrafast Na⁺‐Storage in T‐Nb₂O₅/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Wang

et al. 2019

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Hybrid Na‐ion capacitors (NICs) are receiving considerable interest because they combine the merits of both batteries and supercapacitors and because of the low‐cost of sodium resources. However, further large‐scale deployment of NICs is impeded by the sluggish diffusion of Na+ in the anode. To achieve rapid redox kinetics, herein the controlled fabrication of mesoporous orthorhombic‐Nb2O5 (T‐Nb2O5)/carbon nanofiber (CNF) networks is demonstrated via in situ SiO2‐etching. The as‐obtained mesoporous T‐Nb2O5 (m‐Nb2O5)/CNF membranes are mechanically flexible without using any additives, binders, or current collectors. The in situ formed mesopores can efficiently increase Na+‐storage performances of the m‐Nb2O5/CNF electrode, such as excellent rate capability (up to 150 C) and outstanding cyclability (94% retention after 10 000 cycles at 100 C). A flexible NIC device based on the m‐Nb2O5/CNF anode and the graphene framework (GF)/mesoporous carbon nanofiber (mCNF) cathode, is further constructed, and delivers an ultrahigh power density of 60 kW kg−1 at 55 Wh kg−1 (based on the total weight of m‐Nb2O5/CNF and GF/mCNF). More importantly, owing to the free‐standing flexible electrode configuration, the m‐Nb2O5/CNF//GF/mCNF NIC exhibits high volumetric energy and power densities (11.2 mWh cm−3, 5.4 W cm−3) based on the full device, which holds great promise in a wide variety of flexible electronics.

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“…Additionally, the assembled BTNT//AC SIC presented a maximum energy density of around 68 Wh kg −1 and ultralong cycle life. Recently, TiO 2 nanorods, metal–organic framework‐derived TiO 2 , and titanium oxynitride mesoporous nanowires were also studied as intercalation‐type anodes to construct SICs, all of which delivered outstanding electrochemical properties including high rate capacities and excellent cycling stabilities. However, the sodium‐free anode should be sodiated before fabricating the SICs, which complicates the process, and the degree of pre‐sodiation is not definite yet, which significantly determines the performance of SICs.…”

Section: Materials For Sicsmentioning

confidence: 99%

Sodium‐ion capacitors: Materials, Mechanism, and Challenges

et al. 2020

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Sodium‐ion capacitors (SICs), designed to attain high energy density, rapid energy delivery, and long lifespan, have attracted much attention because of their comparable performance to lithium‐ion capacitors (LICs), alongside abundant sodium resources. Conventional SIC design is based on battery‐like anodes and capacitive cathodes, in which the battery‐like anode materials involve various reactions, such as insertion, alloying, and conversion reactions, and the capacitive cathode materials usually depend on activated carbon (AC). However, researchers have attempted to construct SICs based on battery‐like cathodes and capacitive anodes or a combination of both in recent years. In this Minireview, charge storage mechanisms and material design strategies for SICs are summarized, with a focus on the battery‐like anode materials from both inorganic and organic sources. Additionally, the challenges in the fabrication of SICs and future research directions are discussed.

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Pseudocapacitive titanium oxynitride mesoporous nanowires with iso-oriented nanocrystals for ultrahigh-rate sodium ion hybrid capacitors

Abstract: Titanium oxynitride mesoporous nanowires (Ti(O,N)-MP-NWs) composed of iso-oriented interconnected nanocrystals with [100] preferred orientation and tunable O/N ratios are synthesized and exhibit remarkable pseudocapacitive behavior for ultrahigh-rate sodium ion hybrid capacitor.

Cited by 100 publications

References 55 publications

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Mesopore‐Induced Ultrafast Na⁺‐Storage in T‐Nb₂O₅/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Sodium‐ion capacitors: Materials, Mechanism, and Challenges

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Pseudocapacitive titanium oxynitride mesoporous nanowires with iso-oriented nanocrystals for ultrahigh-rate sodium ion hybrid capacitors

Abstract: Titanium oxynitride mesoporous nanowires (Ti(O,N)-MP-NWs) composed of iso-oriented interconnected nanocrystals with [100] preferred orientation and tunable O/N ratios are synthesized and exhibit remarkable pseudocapacitive behavior for ultrahigh-rate sodium ion hybrid capacitor.

Cited by 100 publications

References 55 publications

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Flexible Quasi‐Solid‐State Sodium‐Ion Capacitors Developed Using 2D Metal–Organic‐Framework Array as Reactor

Mesopore‐Induced Ultrafast Na+‐Storage in T‐Nb2O5/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors

Sodium‐ion capacitors: Materials, Mechanism, and Challenges

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Mesopore‐Induced Ultrafast Na⁺‐Storage in T‐Nb₂O₅/Carbon Nanofiber Films toward Flexible High‐Power Na‐Ion Capacitors