Oxygen-deficient titanium dioxide as a functional host for lithium–sulfur batteries

Wang, Hong‐En; Yin, Kang; Qin, Ning; Zhao, Xu; Xia, Fanjie; Hu, Zhi‐Yi; Guo, Guanlun; Cao, Guozhong; Zhang, Wenjun

doi:10.1039/c9ta01598a

Cited by 115 publications

(69 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When metal compounds such as TiO 2 and MoS 2 as sulfur hosts contain the vacancies, their electrons below the Fermi level can leap into the defect level, which would create a hole carrier and lower the barrier of electron transition to the conduction band, resulting in the improvement of the electronic conductivity and the acceleration of the lithium polysulfides (LiPSs) conversion reaction kinetics. [28] Vacancies can form the electron-rich region and abundant active sites, enhancing Li-ion storage performance and inhibiting the diffusion and shuttle of active materials. For some sulfur hosts, the vacancy defects possessing the abundant localized electron would act as active centers for the adsorption, which could generate stronger adsorption strength for LiPSs than the bonding energy with dioxolane/dimethoxyethane (DOL/DME), thus the presence of vacancies in sulfur hosts can effectively inhibit the diffusion and shuttle of LiPSs, leading to the enhancement in electrochemical performance of LiÀ S batteries.…”

Section: Vacanciesmentioning

confidence: 99%

Function and Application of Defect Chemistry in High‐Capacity Electrode Materials for Li‐Based Batteries

Qiao

Lin

Yan

et al. 2020

Chemistry An Asian Journal

View full text Add to dashboard Cite

Current commercial Li-based batteries are approaching their energy density limitation, yet still cannot satisfy the energy density demand of the high-end devices. Hence, it is critical to developing advanced electrode materials with high specific capacity. However, these electrode materials are facing challenges of severe structural degradation and fast capacity fading. Among various strategies, constructing defects in electrode materials holds great promise in addressing these issues. Herein, we summarize a series of significant defect engineering in the high-capacity electrode materials for Li-based batteries. The detailed retrospective on defects specification, function mechanism, and corresponding application achievements on these electrodes are discussed from the view of point, line, planar, volume defects. Defect engineering can not only stabilize the structure and enhance electric/ionic conductivity, but also act as active sites to improve the ionic storage and bonding ability of electrode materials to Li metal. We hope this review can spark more perspectives on evaluating high-energydensity Li-based batteries.

show abstract

Section: Vacanciesmentioning

confidence: 99%

Function and Application of Defect Chemistry in High‐Capacity Electrode Materials for Li‐Based Batteries

Qiao

Lin

Yan

et al. 2020

Chemistry An Asian Journal

View full text Add to dashboard Cite

show abstract

“…However, Fe 2 O 3 , just like most of other metal oxides, yields intrinsically low conductivity, which prevents from making full use of the advantage of itself. [ 26 ] Interestingly, it is demonstrated that the conductivity of metal oxides can be effectively improved through implanting oxygen‐deficient structure. In addition, surface defects could enhance the catalytic activity of catalysts through tuning their electronic structures.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐Deficient Ferric Oxide as an Electrochemical Cathode Catalyst for High‐Energy Lithium–Sulfur Batteries

Wang

et al. 2020

Small

View full text Add to dashboard Cite

Lithium–sulfur batteries, as one of promising next‐generation energy storage devices, hold great potential to meet the demands of electric vehicles and grids due to their high specific energy. However, the sluggish kinetics and the inevitable “shuttle effect” severely limit the practical application of this technology. Recently, design of composite cathode with effective catalysts has been reported as an essential way to overcome these issues. In this work, oxygen‐deficient ferric oxide (Fe2O3−x), prepared by lithiothermic reduction, is used as a low‐cost and effective cathodic catalyst. By introducing a small amount of Fe2O3−x into the cathode, the battery can deliver a high capacity of 512 mAh g−1 over 500 cycles at 4 C, with a capacity fade rate of 0.049% per cycle. In addition, a self‐supporting porous S@KB/Fe2O3−x cathode with a high sulfur loading of 12.73 mg cm−2 is prepared by freeze‐drying, which can achieve a high areal capacity of 12.24 mAh cm−2 at 0.05 C. Both the calculative and experimental results demonstrate that the Fe2O3−x has a strong adsorption toward soluble polysulfides and can accelerate their subsequent conversion to insoluble products. As a result, this work provides a low‐cost and effective catalyst candidate for the practical application of lithium–sulfur batteries.

show abstract

“…The growing requirements of sustainable and green energy are promoting the practical applications of energy storage devices. Batteries have been broadly applied for communication devices and new energy vehicles because of the environmental friendliness and high energy density . For lithium ion batteries (LIBs), the tremendous demand for lithium results in its unavailability .…”

Section: Introductionmentioning

confidence: 99%

Nickel cobalt oxide nanowires‐modified hollow carbon tubular bundles for high‐performance sodium‐ion hybrid capacitors

Zhao

Zhou

et al. 2020

Int J Energy Res

View full text Add to dashboard Cite

Summary Sodium‐ion hybrid capacitors are a prospective energy storage device candidate that couples the superiorities of battery‐type and capacitive storage mechanisms. In this study, we fabricate a composite of NiCo2O4 nanowires with carbon tubular bundles (CTBs) via a facile hydrothermal and annealing procedure. The density functional theory (DFT) calculations are performed to evaluate the bonding strength between the two components of the composite, the binding energy of the NiCo2O4 is calculated to be −0.952 J m−2, indicating that the NiCo2O4 nanowires can be stabilized on both sides of the carbon tubular bundles, which leads to a good cycling performance. Moreover, the composite in this work exhibits a metallic property because of the introduction of carbon material. As expected, when used for sodium storage, the NiCo2O4/CTBs shows a high capacity of 298 mA h g−1 at 1 A g−1 and high capacity retention of 92% after 500 cycles, which are superior than the bare NiCo2O4 electrode. Consequently, the sodium‐ion hybrid capacitor is also assembled with NiCo2O4/carbon tubular bundles and commercial activated carbon, which achieves high energy density of 99 Wh kg−1 in a wide potential range from 0.5 V to 4.0 V.

show abstract

Oxygen-deficient titanium dioxide as a functional host for lithium–sulfur batteries

Abstract: Engineering oxygen vacancies in mesoporous TiO2 effectively enhanced its ability to trap polysulfides and simultaneously propelled the redox conversion of polysulfides.

Cited by 115 publications

References 73 publications

Function and Application of Defect Chemistry in High‐Capacity Electrode Materials for Li‐Based Batteries

Function and Application of Defect Chemistry in High‐Capacity Electrode Materials for Li‐Based Batteries

Oxygen‐Deficient Ferric Oxide as an Electrochemical Cathode Catalyst for High‐Energy Lithium–Sulfur Batteries

Nickel cobalt oxide nanowires‐modified hollow carbon tubular bundles for high‐performance sodium‐ion hybrid capacitors

Contact Info

Product

Resources

About