Superior sodium-storage behavior of flexible anatase TiO2 promoted by oxygen vacancies

Ni, Qiao; Dong, Ruiqi; Bai, Ying; Wang, Zhaohua; Ren, Haixia; Sean, Sandstrom; Wu, Feng; Xu, Huajie; Wu, Chuan

doi:10.1016/j.ensm.2019.09.001

Cited by 145 publications

(72 citation statements)

References 58 publications

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“…Two peaks located at 529.4 eV and 531.5 eV in the O 1s spectra are observed for both TiO x and commercial TiO 2 nanoparticles, which can be assigned to the lattice oxygen (Ti−O−Ti) and non‐lattice oxygen (e. g., the surface hydroxyl groups, Ti−OH), respectively . An additional peak located at 533.1 eV appeared in the spectrum of TiO x nanoparticles, indicating the existence of oxygen vacancies in the TiO x sample . The high resolution Ti 2p spectrum of commercial TiO 2 has two peaks at 458.6 and 464.4 eV, corresponding to Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 , respectively.…”

Section: Resultsmentioning

confidence: 96%

“…[51,52] An additional peak located at 533.1 eV appeared in the spectrum of TiO x nanoparticles, indicating the existence of oxygen vacancies in the TiO x sample. [53,54] The high resolution Ti 2p spectrum of commercial TiO 2 has two peaks at 458.6 and 464.4 eV, corresponding to Ti 4 + 2p 3/2 and Ti 4 + 2p 1/2 , respectively. An additional pair of peaks located at 457.8 and 463.3 eV, corresponding to Ti 3 + 2p 3/2 and Ti 3 + 2p 1/2 , [34,55] respectively, are observed for the TiO x sample.…”

Section: Resultsmentioning

confidence: 99%

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Ultrasmall TiO_x Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Gao

She

et al. 2020

ChemElectroChem

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Ultrasmall particle size (< 10 nm) and rich oxygen vacancies are two sought-after characteristics for titanium dioxide (TiO 2) to achieve high performance, namely, high rate and high storage capacity, when being used as an anode in lithium-ion batteries (LIBs). However, free TiO 2 particles simultaneously possessing both characteristics have not been reported, owing to the synthetic challenges. In this study, we report novel TiO 2 nanoparticles with ultrasmall size (ca. 5-8 nm) as well as rich oxygen vacancies synthesized through a simple strategy. Specifically, porous carbon nanoparticles were used to confine the TiO 2 precursor in the nanosized pores in the carbon nanoparticles, which were annealed at a high temperature in argon to produce the TiO 2 nanoparticles with ultrasmall size and rich oxygen vacancies and subsequently annealed in air to burn away the carbon nanoparticles to afford the so-called TiO x nanoparticles in a quantitative yield. The obtained anatase TiO x nanoparticles showed an exceptional ultrahigh-rate lithium storage capability. A record reversible specific capacity of 235 mAh g À 1 was achieved at the current density of 0.1 A g À 1. Even at an ultrahigh rate of 10 A g À 1 (ca. 59 C), it still delivered a specific capacity of 90 mAh g À 1 , which is five times that of the electrode made with the commercial anatase TiO 2 nanoparticles. Furthermore, this electrode also showed an excellent cycling performance with capacity retentions of 87 % and 90 % at high rates of 1 A g À 1 and 5 A g À 1 , respectively, after 1000 cycles. The strategy reported in this work can potentially be a universal method for synthesis of other metal oxides with ultrasmall particle size and rich oxygen vacancies.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Ultrasmall TiO_x Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Gao

She

et al. 2020

ChemElectroChem

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“…Ni et. al created OVs into TiO 2 structure through ex situ electrospinning method, the energy bandgap of which was reduced from 1.630 eV to 1.472 eV (Figure 1d and e) with enhanced electronic conductivity, resulting in better reversibility of Na + insertion/extraction into/from the oxygen‐deficient TiO 2 compared with the pristine TiO 2 [21] . All in all, the different formation of oxygen vacancies resulted in corresponding bandgap variation, which could significantly enhance the electrical conductivity of TiO 2 .…”

Section: Structural Propertiesmentioning

confidence: 99%

Oxygen Vacancy Engineering in Titanium Dioxide for Sodium Storage

Wang

Zhang

et al. 2020

Chemistry An Asian Journal

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Titanium dioxide (TiO2) is a promising anode material for sodium‐ion batteries (SIBs) due to its low cost, natural abundance, nontoxicity, and excellent electrochemical stability. Oxygen vacancies, the most common point defects in TiO2, can dramatically influence the physical and chemical properties of TiO2, including band structure, crystal structure and adsorption properties. Recent studies have demonstrated that oxygen‐deficient TiO2 can significantly enhance sodium storage performance. Considering the importance of oxygen vacancies in modifying the properties of TiO2, the structural properties, common synthesis strategies, characterization techniques, as well as the contribution of oxygen‐deficient TiO2 on initial Coulombic efficiency, cyclic stability, rate performance for sodium storage are comprehensively described in this review. Finally, some perspectives on the challenge and future opportunities for the development of oxygen‐deficient TiO2 are proposed.

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“…[ 23 ] This composite electrode displayed a Na + storage capacity of 147 mAh g −1 at 10 C with a stable cycling performance. A binder‐free electrode consisting of defective TiO 2 and N‐doped carbon nanofibers exhibited a good rate performance with a specific capacity of 114 mAh g −1 at 10 C. [ 26 ] Nevertheless, it has been a great challenge to fabricate flexible electrodes with high mechanical strength to meet practical requirements. [ 2 ] Carbon fiber cloth (CFC) with high electron conductivity and excellent mechanical flexibility is an ideal substrate for supporting free‐standing and binder‐free flexible electrodes.…”

Section: Introductionmentioning

confidence: 99%

Hollow Rutile Cuboid Arrays Grown on Carbon Fiber Cloth as a Flexible Electrode for Sodium‐Ion Batteries

Wang

Zhang

Wang

et al. 2020

Adv Funct Materials

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Flexible electrodes with high charge storage capacity, low solid-state diffusion resistance toward charges, and excellent mechanical properties are needed for fabricating flexible energy storage devices. In this paper, an approach is described to synthesize a composite material with hollow rutile TiO 2 cuboid arrays supported on carbon fiber cloth (H-TiO 2 @CFC). This composite material is used as a self-supporting and binder-free anode for sodium-ion storage, delivering reversible charge capacities of 287.3 at 0.1 C and 103.3 mAh g −1 at 50 C, respectively. The observed excellent electrochemical performance of the H-TiO 2 @CFC electrode is mainly attributed to its unique architecture, which facilitates ion transport, improves electron conductivity, and enables active surface reactivity toward sodium ions. In situ X-ray diffraction characterization results reveal a nearly zero strain structure of the hollow rutile TiO 2 in H-TiO 2 @CFC against electrochemical cycling. An analysis of the charge storage mechanism reveals a significant pseudocapacitance contribution to the charge storage, accounting for the observed high-rate performance of the electrode. A flexible full cell fabricated with the H-TiO 2 @CFC as the anode and Na 3 V 2 (PO 4) 3 as the cathode exhibits both excellent electrochemical properties and flexibility against mechanical deformation, demonstrating the great promise of the H-TiO 2 @CFC composite material for flexible battery cells.

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Superior sodium-storage behavior of flexible anatase TiO2 promoted by oxygen vacancies

Cited by 145 publications

References 58 publications

Ultrasmall TiO_x Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Ultrasmall TiO_x Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Oxygen Vacancy Engineering in Titanium Dioxide for Sodium Storage

Hollow Rutile Cuboid Arrays Grown on Carbon Fiber Cloth as a Flexible Electrode for Sodium‐Ion Batteries

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Superior sodium-storage behavior of flexible anatase TiO2 promoted by oxygen vacancies

Cited by 145 publications

References 58 publications

Ultrasmall TiOx Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Ultrasmall TiOx Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Oxygen Vacancy Engineering in Titanium Dioxide for Sodium Storage

Hollow Rutile Cuboid Arrays Grown on Carbon Fiber Cloth as a Flexible Electrode for Sodium‐Ion Batteries

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Product

Resources

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Ultrasmall TiO_x Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries

Ultrasmall TiO_x Nanoparticles Rich in Oxygen Vacancies Synthesized through a Simple Strategy for Ultrahigh‐Rate Lithium‐Ion Batteries