Synergy of oxygen defects and structural modulation on titanium niobium oxide with a constructed conductive network for high-rate lithium-ion half/full batteries

Sui, Yangyang; Guan, Jinpeng; Li, Kaiyang; Feng, Yubo; Peng, Shengjie; Maximov, Maxim; Liu, Quan; Yang, Jun; Geng, Hongbo

doi:10.1039/d3qi00182b

Cited by 8 publications

(3 citation statements)

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“…Generally, the capacitive-or diffusion-controlled behavior can be qualitatively described from the value of b close to 1.0 or 0.5, respectively. 71 As shown in Figure 6B, the obtained bvalues are fitted to be 0.91, 0.88, 0.93, and 1.04 for the four selected peaks, disclosing that the sodium storage process is mainly governed by the capacitive process for the CoS 2 /FeS-10 electrode. Among them, the b-value of peak 4 is slightly higher than 1, implying that this reaction step is completely controlled by surface capacitive-controlled behavior.…”

Section: Resultsmentioning

confidence: 66%

“…The relationship between the peak current ( i ) and scan rate ( v ) can be evaluated using the power law equation of i = av b . Generally, the capacitive- or diffusion-controlled behavior can be qualitatively described from the value of b close to 1.0 or 0.5, respectively . As shown in Figure B, the obtained b -values are fitted to be 0.91, 0.88, 0.93, and 1.04 for the four selected peaks, disclosing that the sodium storage process is mainly governed by the capacitive process for the CoS 2 /FeS-10 electrode.…”

Section: Resultsmentioning

confidence: 74%

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Ion-Exchange Route Induced Heterostructured CoS₂/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

Liu

Sun

et al. 2023

ACS Appl. Nano Mater.

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As a result of the high theoretical capacities, transition metal sulfides have attracted increasing attention as potential anodes for sodium-ion batteries (SIBs), but severely suffer from large volumetric variations, sluggish kinetics, and polysulfide shuttling. Herein, utilizing metal–organic frameworks (MOFs) as functional templates, heterostructured CoS2/FeS nanoparticles confined in a hollow N-doped carbon framework are successfully fabricated via a controlled ion-exchange reaction combined with subsequent carbonization and sulfurization processes. The construction of CoS2/FeS heterointerfaces promotes electron transfer and provides more active sites, while the derived N-doped carbon framework with a unique hollow interior effectively improves the electrical conductivity, alleviates the volumetric variations, and facilitates the sodium storage process with shortened Na+ diffusion paths. As anodes for SIBs, the optimal CoS2/FeS hybrid composite exhibits a high initial Coulombic efficiency (ICE) of 89.3%, a prolonged cycle life with a capacity of 494 mAh g–1 over 500 cycles under a current density of 1.0 A g–1, and an excellent rate capability of 428 mAh g–1 at 5.0 A g–1, showing the great promise for SIBs. This research offers an efficient and feasible approach for exploring and fabricating bimetallic sulfide heterostructures with a unique hollow structure for high-performance metal-ion batteries.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 74%

Ion-Exchange Route Induced Heterostructured CoS₂/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

Liu

Sun

et al. 2023

ACS Appl. Nano Mater.

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“…Battery electrode materials are constantly being developed to improve their safety and overall performance [4,5]. One method of safety improvement is via the implementation of functional materials in addition to the battery electrodes, of which a variety have been studied to improve the safety of lithium-ion batteries [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Polyacrylonitrile Shutdown Film for Prevention of Thermal Runaway in Lithium-Ion Cells

et al. 2023

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The electrodeposition of a polymer (polyacrylonitrile, PAN) is used to reduce the risk of thermal runaway in lithium-ion batteries, which is the most important cause of battery accidents and fires. PAN was electrodeposited on a graphite battery electrode, using cyclic voltammetry or chronoamperometry, in a solution with acrylonitrile as the solvent. The electrodeposited PAN film was characterised by Raman spectroscopy, microscopy, energy dispersive X-ray analysis, and thermogravimetric analysis, and it was found that the film thickness could be controlled by the amount of charge passed in the electrochemical experiments. The PAN-coated graphite battery electrode was then tested in lithium half-cells, obtaining capacities close to the uncoated graphite sample (ca. 360 mA h g−1) for thin (<10 µm) polymer coatings at 25 °C. Interestingly, for thicker polymer coatings (>20 µm) it was found that the capacity decreased drastically as the temperature increased beyond 80 °C. Such suppression in capacity has applications for thermal runaway protection since the electrochemical reactions of degradation of the electrolyte in contact with the electrode are the root cause of the thermal runaway process. Further work should look into alternative polymer and liquid electrolyte formulations to achieve the desired suppression of electrochemical capacity at high temperatures while retaining high capacities at the operational temperature range.

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Copper Doping of CoSe₂ Nanoparticles Encapsulated into Carbon Nanotubes with Enhanced Electron Conductance as Cathode for Rechargeable Magnesium Batteries

Liu

Dong

et al. 2023

ChemNanoMat

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Rechargeable magnesium batteries (RMBs) have been considered a promising alternative to lithium‐ion batteries (LIBs) due to the high energy density and abundance of magnesium resources. However, the development of high‐performance cathode materials for magnesium batteries has been a significant challenge. Herein, through comprehensive and simple hydrothermal, selenization and impregnation methods, Cu‐doped CoSe2 nanoparticles encapsulated into carbon nanotubes (Cu‐CoSe2@NC) was fabricated. CoSe2 nanoparticles confined in carbon nanotubes (CNTs) growing in three dimensions on the surface of nanofibers have abundant active sites and high doping degree. Cu doping further improves the electron conductance of the Cu‐CoSe2@NC for RMBs. As cathode, Cu‐CoSe2@NC delivers a reversible capacity of 294 mAh g−1 at 20 mA g−1 and 104 mAg g−1 at 500 mA g−1, which exhibits a reasonable specific capacity and rate capability. The characterization of the Cu‐CoSe2@NC by ex‐situ transmission electron microscopy (TEM) after cycles shows that it can be well adapted to the (de)intercalation of magnesium ions. Density Functional Theory (DFT) calculation shows that CoSe2 band gap decreases obviously after Cu doping, favoring the electron and ion transport. This work provides a reference for the design of cathode materials based on transition metal selenide for RMBs.

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Synergy of oxygen defects and structural modulation on titanium niobium oxide with a constructed conductive network for high-rate lithium-ion half/full batteries

Abstract: Titanium-niobium oxide as electrode material for lithium-ion batteries (LIBs) has relatively high working potential and theoretical capacity, which is expected to replace graphite anode. However, it possesses low electronic conductivity,...

Cited by 8 publications

References 61 publications

Ion-Exchange Route Induced Heterostructured CoS₂/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

Ion-Exchange Route Induced Heterostructured CoS₂/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

A Polyacrylonitrile Shutdown Film for Prevention of Thermal Runaway in Lithium-Ion Cells

Copper Doping of CoSe₂ Nanoparticles Encapsulated into Carbon Nanotubes with Enhanced Electron Conductance as Cathode for Rechargeable Magnesium Batteries

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Synergy of oxygen defects and structural modulation on titanium niobium oxide with a constructed conductive network for high-rate lithium-ion half/full batteries

Abstract: Titanium-niobium oxide as electrode material for lithium-ion batteries (LIBs) has relatively high working potential and theoretical capacity, which is expected to replace graphite anode. However, it possesses low electronic conductivity,...

Cited by 8 publications

References 61 publications

Ion-Exchange Route Induced Heterostructured CoS2/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

Ion-Exchange Route Induced Heterostructured CoS2/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

A Polyacrylonitrile Shutdown Film for Prevention of Thermal Runaway in Lithium-Ion Cells

Copper Doping of CoSe2 Nanoparticles Encapsulated into Carbon Nanotubes with Enhanced Electron Conductance as Cathode for Rechargeable Magnesium Batteries

Contact Info

Product

Resources

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Ion-Exchange Route Induced Heterostructured CoS₂/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

Ion-Exchange Route Induced Heterostructured CoS₂/FeS Nanoparticles Confined in Hollow N-Doped Carbon Frameworks for Enhanced Sodium Storage Performance

Copper Doping of CoSe₂ Nanoparticles Encapsulated into Carbon Nanotubes with Enhanced Electron Conductance as Cathode for Rechargeable Magnesium Batteries