Oxygen vacancy boosted the electrochemistry performance of Ti4+ doped Nb2O5 toward lithium ion battery

Zhai, Ximei; Liu, Jialin; Zhao, Yongjie; Chen, Chao; Zhao, Xiuchen; Li, Jingbo; Jin, Haibo

doi:10.1016/j.apsusc.2019.143905

Cited by 42 publications

(32 citation statements)

References 37 publications

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“…To confirm the crystallization properties of the products, the XRD patterns were collected as shown in (Figure 2a, inset), suggesting the distortion of lattice structure as well as the formation of V o . [35][36][37] Figure 2b presents the Raman spectra of the Nb 2 O 5 , Nb 2 O 5−x , and Nb 2 O 5−x / CNTs. Comparatively, the D and G bands can be observed only in Nb 2 O 5−x /CNTs spectrum, confirming the existence of CNTs.…”

Section: Resultsmentioning

confidence: 99%

Engineering the Conductive Network of Metal Oxide‐Based Sulfur Cathode toward Efficient and Longevous Lithium–Sulfur Batteries

Wang

Luo

et al. 2020

Advanced Energy Materials

149

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The rational design of sulfur cathode structure to suppress shuttling behaviors and expedite the conversion kinetics of polysulfides plays an essential role for the practical implementation of lithium–sulfur (Li–S) batteries. In this work, a unique consecutive and oxygen‐deficient niobium oxide (Nb2O5−x) framework featured with 3D ordered macroporous (3DOM) architecture and carbon nanotubes (CNTs) embedding is developed, which serves as a high‐performance sulfur immobilizer and catalytic promoter for polysulfide conversion. The 3DOM architecture affords a robust porous and open framework that favors electrolyte infiltration for fast ion/mass transfer, as well as interface exposure for massive host–guest interactions. More importantly, CNTs are designed as “antennae” embedded within the Nb2O5−x skeleton, which not only contributes to a highly conductive framework but also intensifies the oxygen deficiency with enhanced sulfur immobilization and reaction catalyzation. Benefiting from these advanced features, Li–S cells based on S‐Nb2O5−x/CNTs cathode achieve excellent cyclability with a high capacity retention of 847 mAh g−1 after 500 cycles and remarkable rate capability with 741 mAh g−1 at 5 C. Moreover, a high areal capacity of 6.07 mAh cm−2 can also be achieved under a high sulfur loading of 6 mg cm−2, illustrating great potential in the development of practical Li–S batteries.

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Section: Resultsmentioning

confidence: 99%

Engineering the Conductive Network of Metal Oxide‐Based Sulfur Cathode toward Efficient and Longevous Lithium–Sulfur Batteries

Wang

Luo

et al. 2020

Advanced Energy Materials

149

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“…The residual lithium was captured by AlOOH/SiO 2 on the NCM surface to form LiAlO 2 /Si 1– x Al x O 2 during the high sintering temperature, which could effectively hinder the direct contact between the NCM surface and CO 2 /H 2 O, thus inhibiting the generation of Ni 2+ . Moreover, the quantitative analysis results found that the surface oxygen vacancy content of the NCM@LSAO is higher than that of NCM@SO, due to that Al doping could effectively increase the oxygen vacancy on the SiO 2 surface in the NCM@LSAO. − To further indicate that Al doping introduces the oxygen vacancy on the SiO 2 surface in the NCM@LSAO, the electron paramagnetic resonance (EPR) was carried out, as shown in Figure f. An oxygen vacancy characteristic peak of g = 2.005 was observed in all samples.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional Surface Coating of LiAlO₂/Si_1–xAl_xO₂ Hybrid Layer on Ni-Rich Cathode Materials for High Performance Lithium-Ion Batteries

Wang

Chu

Pan

et al. 2021

ACS Sustainable Chem. Eng.

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As a candidate material for high energy density cathode, nickelrich layered oxide cathode material LiNi 0.6 Co 0.2 Mn 0.2 O 2 has become the current research hotspot for lithium-ion batteries. However, the instability of the surface reaction interface promotes the change of surface structure and bulk structure for LiNi 0.6 Co 0.2 Mn 0.2 O 2 , resulting in poor cycling stability that hindered its practical application. Here, the LiNi 0.6 Co 0.2 Mn 0.2 O 2 surface modified by hybrid coating layer (NCM@LSAO) is reported. In this constructed hybrid layer, the LiAlO 2 with layered structure can be firmly anchored on the NCM surface, and Si 1−x Al x O 2 with high electrical conductivity and chemical stability can be used as a protective layer to inhibit the occurrence of surface side reactions. Hence, combining the advantages of the LiAlO 2 and Si 1−x Al x O 2 coating layer, which can effectively suppress the structural transformation and surface reaction interface failure upon long cycling, thus has improved the electrochemical performance accordingly. As a result, LiAlO 2 /Si 1−x Al x O 2 surface-modified LiNi 0.6 Co 0.2 Mn 0.2 O 2 exhibits excellent rate performance, with a high discharge specific capacity of 153.4 mAh/g even at 10 C. In addition, the cyclic stability is also much improved, which can deliver a high discharge capacity of 130.1 mAh/g after 500 cycles at 5 C, with a capacity retention of 78.5%.

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“…[8,9] Materials that have exhibited intercalation pseudocapacitive responses have sufficiently fast solid-state diffusion and an absence of phase transitions upon intercalation. [7][8][9][10][11][12][13][14] The introduction of dopants or other defects have been used to increase the rates of solid-state diffusion with examples for Cu[Fe(CN) 6 ] 0.63 * & 0.37 * 3.4H 2 O, [15] T-Nb 2 O 5 , [16][17][18] MoO 3 , [19] TiO 2 , [20,21] and others. [22,23] Nanoscale materials can also differ from bulk analogs, for example, nanoscale anatase can lithiate as a solid solution whereas larger anatase crystals undergo a phase separation of discrete lithium rich and lithium poor domains.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the deliberate introduction of oxygen vacancies and dopants to intercalation materials have increased Li diffusivity, [16,17,23] electronic conductivity, [42,43] or both. [18][19][20] Dopants can provide shallow electron donors for enhanced electronic conductivity. [18,42,44] Improved electronic conductivity can improve ionic conductivity when lithium diffusion is coupled with electron transport in cases where D Li > D eÀ .…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20] Dopants can provide shallow electron donors for enhanced electronic conductivity. [18,42,44] Improved electronic conductivity can improve ionic conductivity when lithium diffusion is coupled with electron transport in cases where D Li > D eÀ . [45] Vacancies similarly provide shallow electron donors which can increase electronic conductivity [16,19,20,43] and increase freevolume, [19] both of which can enhance Li diffusivity.…”

Section: Introductionmentioning

confidence: 99%

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Faster Intercalation Pseudocapacitance Enabled by Adjustable Amorphous Titania Where Tunable Isomorphic Architectures Reveal Accelerated Lithium Diffusivity

Bergh

Larison

Fornerod

et al. 2022

Batteries & Supercaps

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Intercalation pseudocapacitance is a faradaic electrochemical phenomenon with high power and energy densities, combining the attractive features of capacitors and batteries, respectively. Intercalation pseudocapacitive responses exhibit surface-limited kinetics by definition, without restriction from the collective of diffusion-based processes. The surface-limited threshold (SLT) corresponds to the maximum voltage sweep rate (v SLT ) exhibiting a predominantly surface-limited current response prior to the onset of diffusion-limitations. Prior studies showed increased lithium diffusivity for amorphous titania compared to anatase. Going beyond prior binary comparisons, here a continuum of amorphous titania configurations were prepared using a series of calcination temperatures to tailor both amorphous character and content. The corresponding amorphous-phase v SLT increased monotonically by 317 % with lowered calcination temperatures. Subsequent isomorphic comparisons varying a single transport parameter at a time identified solid-state lithium diffusion as the dominant diffusive constraint. Thus, performance improvements were linked to increasing the lithium diffusivity of the amorphous phase with decreased calcination temperature. This remarkably enabled 95 % capacity retention (483 � 17 C/g) with 30 s of delithiation (120 C equivalent). These results highlight how isomorphic sample series can reveal previously unidentified trends by reducing ambiguity and reiterate the potential of amorphization to realize increased performance in known materials.[a] W. van den Bergh, T.

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Oxygen vacancy boosted the electrochemistry performance of Ti4+ doped Nb2O5 toward lithium ion battery

Cited by 42 publications

References 37 publications

Engineering the Conductive Network of Metal Oxide‐Based Sulfur Cathode toward Efficient and Longevous Lithium–Sulfur Batteries

Engineering the Conductive Network of Metal Oxide‐Based Sulfur Cathode toward Efficient and Longevous Lithium–Sulfur Batteries

Bifunctional Surface Coating of LiAlO₂/Si_1–xAl_xO₂ Hybrid Layer on Ni-Rich Cathode Materials for High Performance Lithium-Ion Batteries

Faster Intercalation Pseudocapacitance Enabled by Adjustable Amorphous Titania Where Tunable Isomorphic Architectures Reveal Accelerated Lithium Diffusivity

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Oxygen vacancy boosted the electrochemistry performance of Ti4+ doped Nb2O5 toward lithium ion battery

Cited by 42 publications

References 37 publications

Engineering the Conductive Network of Metal Oxide‐Based Sulfur Cathode toward Efficient and Longevous Lithium–Sulfur Batteries

Engineering the Conductive Network of Metal Oxide‐Based Sulfur Cathode toward Efficient and Longevous Lithium–Sulfur Batteries

Bifunctional Surface Coating of LiAlO2/Si1–xAlxO2 Hybrid Layer on Ni-Rich Cathode Materials for High Performance Lithium-Ion Batteries

Faster Intercalation Pseudocapacitance Enabled by Adjustable Amorphous Titania Where Tunable Isomorphic Architectures Reveal Accelerated Lithium Diffusivity

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Bifunctional Surface Coating of LiAlO₂/Si_1–xAl_xO₂ Hybrid Layer on Ni-Rich Cathode Materials for High Performance Lithium-Ion Batteries