High-rate lithium storage performance of TiNb2O7 anode due to single-crystal structure coupling with Cr3+-doping

Gong, Shuya; Wang, Yue; Zhu, Qizhen; Li, Meng; Wen, Yuehua; Wang, Hong; Qiu, Jingyi; Xu, Bin

doi:10.1016/j.jpowsour.2023.232672

Cited by 11 publications

(4 citation statements)

References 41 publications

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Section: Resultsmentioning

confidence: 99%

“…The capacities observed for both upcycled materials are similar to the pristine materials, as seen in the literature, indicating that this upcycling process is a promising route to these materials. [50][51][52][53][54][55] Aer the rate test, long term cycling was performed on both materials at 0.2 A g −1 for 100 cycles. Both upcycled materials showed a good capacity retention over 100 cycles at ca.…”

Section: Lithium Extractionmentioning

confidence: 99%

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High-power recycling: upcycling to the next generation of high-power anodes for Li-ion battery applications

Green,

Driscoll,

Anderson

et al. 2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Section: Lithium Extractionmentioning

confidence: 99%

High-power recycling: upcycling to the next generation of high-power anodes for Li-ion battery applications

Green,

Driscoll,

Anderson

et al. 2024

J. Mater. Chem. A

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“…LIFBs are mainly composed of positive electrode, negative electrode, electrolyte, separator, and auxiliary materials. Cathode materials, , anode materials, − electrolytes, , separator, , auxiliary material, tab design, structure design, and so on can improve the rate performance of LIFBs.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Application of Microporous Current Collector in Ultra-Fast Lithium-Ion Full Battery

Fu,

Zhao,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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The widespread popularity of lithium-ion full batteries (LIFBs) has gradually demonstrated the need for fast charge and discharge. In this article, the application of microporous copper foil current collector (MC) and microporous aluminum foil current collector (MA) prepared by electrolytic etching in ultra-high rate LIFBs was studied. Compared with conventional copper foil current collectors (CC) and aluminum foil current collectors (CA), MC–MA has better electrical performance and safety performance in an ultra-high-rate system. The pore size of MC is mainly distributed in 2–10 μm, and MA is mainly distributed in 1–15 μm. Scanning electron microscope shows that the pore structure on MC–MA is a disordered pore. The formation of micropores weakens mechanical strength and elongation of the current collector. The strength of copper foil before and after pore-forming decreased from 317.77 to 305.21 MPa, and the elongation decreased from 5.4 to 2.26%. The strength of aluminum foil before and after pore-forming decreased from 287.24 to 237.83 MPa, and the elongation decreased from 3.16 to 1.74%. However, there was no significant change in the thickness and areal density before and after pore-forming. The formation of micropores increases the three-dimensional interface contact sites of the current collector, thereby improving adhesion strength and reducing the resistivity of the electrode. However, too many contact interfaces also face more side reactions, which also cause the self-discharge and high-temperature storage of MC–MA (0.033) to be slightly worse than that of CC–CA (0.030). The electrochemical results show that MC–MA has a larger specific capacity, better rate performance, and lower electrochemical impedance. The capacity retentions of MC–MA after 500 cycles at 5C and 10C were 84.81 and 76.96% and CC–CA were 81.85 and 62.43%, respectively. The capacity retentions of MC–MA and CC–CA are 84.20 and 73.78% after 500 cycles at 5C charge and 15C pulse discharge. The cell disassembly found that lithium dendrites were the main cause of the capacity decay. The excellent three-dimensional interface of micropore provides more reaction sites, and two-dimensional surface defects reduce current density distribution and realize uniform distribution of lithium ions at different phase interfaces. The micropore provides stress release space for volume expansion of charge and discharge and improves voltage hysteresis caused by compressive stress at the interface between the current collector and materials coating. In addition, due to pore structure changes in the elastic deformation ability and surface current density distribution of the current collector, the safety performance of LIFBs is improved.

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“…In addition, the tap density does not decrease as in the case of the carbon black addition. Depending on the dopant, an increase in electronic conductivity can be achieved by narrowing the band gap by adding the impurity bands as in the case of V 5+ doping, , or by adding unpaired electrons as in the case of Ru 4+ , Cu 2+ , , Cr 3+ , , and Tb 3+ doping, or by charge compensation as in the case of heterovalent substitution of Ti/Nb atoms with Mo 6+ , ,, W 6+ , , Al 3+ , and La 3+ ions and self-doping of Ti 1– x Nb 2+ x O 7 , (Table ). Doping with ions with a larger ionic radius, for example, Cu 2+ , , Tb 3+ , La 3+ , and Zr 4+ , , leads to an increase in the cell volume, which eliminates the limitations on lithium diffusion.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of the Structure and Electrochemical Properties of V-Doped TiNb₂O₇ Anode for Lithium-Ion Batteries

Tsydypylov,

Kabanov,

Morkhova

et al. 2023

J. Phys. Chem. C

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Vanadium-doped TiNb 2 O 7 anode material with a Wadsley−Roth crystallographic shear structure was prepared by a mechanochemically assisted solid-state synthesis. Partial substitution of Ti 4+ or Nb 5+ with V 5+ ions was studied by using theoretical and experimental approaches. The crystal structure and morphology of the samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Possible interstitial sites, the energy of V 5+ doping, and the electronic structure of TiNb 2 O 7 doped with vanadium were investigated using theoretical modeling. According to electron paramagnetic resonance spectroscopy (EPR), the substitution of Ti 4+ by V 5+ leads to a higher content of reduced Ti and Nb atoms, compared to the case of Nb 5+ substitution by V 5+ . Electrochemical performance was studied by galvanostatic cycling and cyclic voltammetry (CV). The lithium diffusion coefficient for Ti 0.99 V 0.01 Nb 2 O 7 and TiNb 1.99 V 0.01 O 7 determined by CV was an order of magnitude higher than those for TiNb 2 O 7 , Ti 0.95 V 0.05 Nb 2 O 7 , and TiNb 1.95 V 0.05 O 7 . It was shown that Ti 1−x V x Nb 2 O 7 samples have superior electrochemical performance compared to TiNb 2−x V x O 7 and pristine samples due to the charge compensation of V 5+ when substituting Ti 4+ . Improved electrochemical performance of Ti 0.99 V 0.01 Nb 2 O 7 (reversible capacity of 194 mAh g −1 at 5C) is associated with improved ionic conductivity due to an increase in the unit cell volume as a result of interstitial V 5+ doping.

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High-rate lithium storage performance of TiNb2O7 anode due to single-crystal structure coupling with Cr3+-doping

Cited by 11 publications

References 41 publications

High-power recycling: upcycling to the next generation of high-power anodes for Li-ion battery applications

High-power recycling: upcycling to the next generation of high-power anodes for Li-ion battery applications

Investigation on the Application of Microporous Current Collector in Ultra-Fast Lithium-Ion Full Battery

Theoretical and Experimental Study of the Structure and Electrochemical Properties of V-Doped TiNb₂O₇ Anode for Lithium-Ion Batteries

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High-rate lithium storage performance of TiNb2O7 anode due to single-crystal structure coupling with Cr3+-doping

Cited by 11 publications

References 41 publications

High-power recycling: upcycling to the next generation of high-power anodes for Li-ion battery applications

High-power recycling: upcycling to the next generation of high-power anodes for Li-ion battery applications

Investigation on the Application of Microporous Current Collector in Ultra-Fast Lithium-Ion Full Battery

Theoretical and Experimental Study of the Structure and Electrochemical Properties of V-Doped TiNb2O7 Anode for Lithium-Ion Batteries

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Product

Resources

About

Theoretical and Experimental Study of the Structure and Electrochemical Properties of V-Doped TiNb₂O₇ Anode for Lithium-Ion Batteries