Nanosheet‐Constructed Porous TiO<sub>2</sub>–B for Advanced Lithium Ion Batteries

Liu, Shaohua; Jia, Haiping; Han, Lu; Wang, Jiulin; Gao, Pengfei; Xu, Dongdong; Yang, Jun; Che, Shunai

doi:10.1002/adma.201201036

Cited by 370 publications

(279 citation statements)

References 35 publications

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“…65-5714), respectively. Anatase TiO 2 may originate from the partial transformation of metastable TiO 2 -B under heating treatment [35][36][37][38] . Refinement results quantify a mass percentage of ca.…”

Section: Resultsmentioning

confidence: 99%

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

et al. 2015

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Sodium-ion batteries are emerging as a highly promising technology for large-scale energy storage applications. However, it remains a significant challenge to develop an anode with superior long-term cycling stability and high-rate capability. Here we demonstrate that the Na þ intercalation pseudocapacitance in TiO 2 /graphene nanocomposites enables high-rate capability and long cycle life in a sodium-ion battery. This hybrid electrode exhibits a specific capacity of above 90 mA h g -1 at 12,000 mA g -1 (B36 C). The capacity is highly reversible for more than 4,000 cycles, the longest demonstrated cyclability to date. First-principle calculations demonstrate that the intimate integration of graphene with TiO 2 reduces the diffusion energy barrier, thus enhancing the Na þ intercalation pseudocapacitive process. The Na-ion intercalation pseudocapacitance enabled by tailor-deigned nanostructures represents a promising strategy for developing electrode materials with high power density and long cycle life.

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Section: Resultsmentioning

confidence: 99%

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

et al. 2015

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“…7 Li, an increase of the lattice parameters a and b of 2.9 and 4.5% is observed, respectively, while c remains virtually unchanged within the experimental error. This anisotropic expansion agrees well with the findings by Armstrong et al 14 and with the orbital interpretation given below.…”

Section: ■ Resultsmentioning

confidence: 60%

New Insights on the Reversible Lithiation Mechanism of TiO₂(B) by Operando X-ray Absorption Spectroscopy and X-ray Diffraction Assisted by First-Principles Calculations

et al. 2014

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Operando X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) measurements provide new insights on the mechanism of lithium insertion into TiO 2 (B). The investigation of the evolution of electronic, long-range, and local structure during electrochemical cycling indicates a purely monophasic insertion mechanism upon lithium insertion, while global and local structure are only slightly modified. While XRD reflects an anisotropic lattice expansion, EXAFS reveals a wide distribution of Ti−O bond length, in line with the presence of two distinct distorted octahedral Ti environments, in agreement with previous DFT calculations. Upon lithium insertion, these Ti−O coordination shells undergo significant modifications which are enhanced once the insertion of 0.4 Li is exceeded, connoting a two regime process that is in good agreement with the electrochemical signature of this material. DFT calculations and local chemical bond analyses were coupled with experimental results, thus providing additional insights into the structural response of TiO 2 (B) upon lithiation.

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“…Considerable attention has been paid on electrochemical energy storage devices, especially rechargeable lithium‐ion batteries (LIBs), with both high power and high energy densities because of the applications in electric vehicles and portable electronic devices 1, 2, 3, 4, 5. However, many potential electrode materials of LIBs are limited by slow Li‐ion diffusion, poor electron transport in electrodes, and increased resistance at the electrode/electrolyte interface at high discharge–charge rates 1, 6.…”

Section: Introductionmentioning

confidence: 99%

“…have received increasing attention as promising Li‐ion battery anode materials owing to their low cost, non‐toxicity, low volume change, excellent recharge ability, improved safety over graphite, and relatively high lithium insertion potential (1.5–1.8 V vs Li/Li + ) 4, 12, 14, 15, 16, 17, 18, 19, 20. Using ultrafine nanocrystalline anatase or rutile, the Li insertion host can efficiently enhance the lithium storage capacity even at high discharge–charge current densities due to the shortened diffusion length and increased number of active sites for Li + insertion 21, 22.…”

Section: Introductionmentioning

confidence: 99%

Phases Hybriding and Hierarchical Structuring of Mesoporous TiO₂ Nanowire Bundles for High‐Rate and High‐Capacity Lithium Batteries

et al. 2015

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A hierarchical mesoporous TiO2 nanowire bundles (HM‐TiO2‐NB) superstructure with amorphous surface and straight nanochannels has been designed and synthesized through a templating method at a low temperature under acidic and wet conditions. The obtained HM‐TiO2‐NB superstructure demonstrates high reversible capacity, excellent cycling performance, and superior rate capability. Most importantly, a self‐improving phenomenon of Li+ insertion capability based on two simultaneous effects, the crystallization of amorphous TiO2 and the formation of Li2Ti2O4 crystalline dots on the surface of TiO2 nanowires, has been clearly revealed through ex situ transmission electron microcopy (TEM), high‐resolution transmission electron microscopy (HRTEM), X‐ray diffraction (XRD), Raman, and X‐ray photoelectron spectroscopy (XPS) techniques during the Li+ insertion process. When discharged for 100 cycles at 1 C, the HM‐TiO2‐NB exhibits a reversible capacity of 174 mA h g−1. Even when the current density is increased to 50 C, a very stable and extraordinarily high reversible capacity of 96 mA h g−1 can be delivered after 50 cycles. Compared to the previously reported results, both the lithium storage capacity and rate capability of our pure TiO2 material without any additives are among the highest values reported. The advanced electrochemical performance of these HM‐TiO2‐NB superstructures is the result of the synergistic effect of hybriding of amorphous and crystalline (anatase/rutile) phases and hierarchically structuring of TiO2 nanowire bundles. Our material could be a very promising anodic material for lithium‐ion batteries.

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Nanosheet‐Constructed Porous TiO₂–B for Advanced Lithium Ion Batteries

Cited by 370 publications

References 35 publications

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

New Insights on the Reversible Lithiation Mechanism of TiO₂(B) by Operando X-ray Absorption Spectroscopy and X-ray Diffraction Assisted by First-Principles Calculations

Phases Hybriding and Hierarchical Structuring of Mesoporous TiO₂ Nanowire Bundles for High‐Rate and High‐Capacity Lithium Batteries

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Nanosheet‐Constructed Porous TiO2–B for Advanced Lithium Ion Batteries

Cited by 370 publications

References 35 publications

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

New Insights on the Reversible Lithiation Mechanism of TiO2(B) by Operando X-ray Absorption Spectroscopy and X-ray Diffraction Assisted by First-Principles Calculations

Phases Hybriding and Hierarchical Structuring of Mesoporous TiO2 Nanowire Bundles for High‐Rate and High‐Capacity Lithium Batteries

Contact Info

Product

Resources

About

Nanosheet‐Constructed Porous TiO₂–B for Advanced Lithium Ion Batteries

New Insights on the Reversible Lithiation Mechanism of TiO₂(B) by Operando X-ray Absorption Spectroscopy and X-ray Diffraction Assisted by First-Principles Calculations

Phases Hybriding and Hierarchical Structuring of Mesoporous TiO₂ Nanowire Bundles for High‐Rate and High‐Capacity Lithium Batteries