Hybrid Energy Storage Devices Based on Monolithic Electrodes Containing Well-defined TiO2 Nanotube Size Gradients

Wei, Wei; Björefors, Fredrik; Nyholm, Leif

doi:10.1016/j.electacta.2015.07.092

Cited by 29 publications

(40 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The very low delithiation capacities seen for the almost fully lithiated silicon electrodes (see Figures S3–S5 in the Supporting Information) may then merely be ascribed to the inability of the electrodes to comply with the employed current densities as the electrodes clearly were full of lithium that should be able to undergo oxidation. As previously discussed, the inherent asymmetry between the lithiation and delithiation reactions should make the lithiation step the rate‐limiting step, in excellent agreement with the experimental results discussed in Section .…”

Section: Resultssupporting

confidence: 86%

“…As is described in more detail in Section , the lithium trapping effect should schematically result in the electrode becoming filled up in a process in which the trapped lithium appears to move toward the electrode surface. It is also likely that the lithium diffusion rate in the silicon electrode depends on the concentration of lithium in the electrode (see Section ), in analogy with the behaviors seen for other electrodes . It can consequently be expected that the lithiation step should become more and more difficult as the lithium concentration in the electrode is increasing.…”

Section: Resultsmentioning

confidence: 87%

See 1 more Smart Citation

On the Capacity Losses Seen for Optimized Nano‐Si Composite Electrodes in Li‐Metal Half‐Cells

Lindgren

Rehnlund

Pan

et al. 2019

Advanced Energy Materials

Self Cite

100

View full text Add to dashboard Cite

While the use of silicon‐based electrodes can increase the capacity of Li‐ion batteries considerably, their application is associated with significant capacity losses. In this work, the influences of solid electrolyte interphase (SEI) formation, volume expansion, and lithium trapping are evaluated for two different electrochemical cycling schemes using lithium‐metal half‐cells containing silicon nanoparticle–based composite electrodes. Lithium trapping, caused by incomplete delithiation, is demonstrated to be the main reason for the capacity loss while SEI formation and dissolution affect the accumulated capacity loss due to a decreased coulombic efficiency. The capacity losses can be explained by the increasing lithium concentration in the electrode causing a decreasing lithiation potential and the lithiation cut‐off limit being reached faster. A lithium‐to‐silicon atomic ratio of 3.28 is found for a silicon electrode after 650 cycles using 1200 mAhg−1 capacity limited cycling. The results further show that the lithiation step is the capacity‐limiting step and that the capacity losses can be minimized by increasing the efficiency of the delithiation step via the inclusion of constant voltage delithiation steps. Lithium trapping due to incomplete delithiation consequently constitutes a very important capacity loss phenomenon for silicon composite electrodes.

show abstract

Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 87%

On the Capacity Losses Seen for Optimized Nano‐Si Composite Electrodes in Li‐Metal Half‐Cells

Lindgren

Rehnlund

Pan

et al. 2019

Advanced Energy Materials

Self Cite

100

View full text Add to dashboard Cite

show abstract

“…In the past decades, fabrication of nanotubular TiO 2 anodic films has been extensively investigated by anodizing Ti foils in an organic electrolyte (i.e., ethylene glycol) containing highly corrosive fluoride ions in the form of HF, NaF or NH 4 F and several mass percent water. [18][19][20]22,[26][27][28][29][30] However, the low electronic conductivity of anodic TiO 2 films resulted in poor electron transport and slow Li-ion diffusion in electrodes, and increased the resistance at the interface of electrode/electrolyte at high charge/discharge rates. The other strategy is to hybridize the TiO 2 nanomaterials with other conductive components in binary or ternary composites, to improve the electronic conductivity and structural stability of 36 However, it inevitably increases the procedure and cost in fabricating electrode materials, in addition to sacrificing the discharge capacity.…”

mentioning

confidence: 99%

Tailoring of Morphology and Crystalline Structure of Nanoporous TiO₂–TiO–TiN Composite Films for Enhanced Capacity as Anode Materials of Lithium-Ion Batteries

Kure‐Chu

Sakuyama

Suzuki

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

We report a novel three-dimensional nanoporous TiO 2 -TiO-TiN (Np-TTT) ternary composite film with cylindrical pores of diameter φ30-50 nm and laminated tier thickness of 10-30 nm, which was fabricated straightforwardly on a Ti foil via a one-step anodization in an aqueous nitric electrolyte. The Np-TTT composite films consisted of amorphous TiO 2 matrix, quasi-crystalline TiO, and a small amount of TiN (∼2 at% as N), which are formed simultaneously during anodization through electrochemical and/or chemical reactions in the nitric electrolyte. As a binder-free and auxiliary-component-free anode material for lithium-ion batteries, the capacity and rate performance of the Np-TTT anodes were dependent on both the anodizing conditions and crystalline structure. Particularly, the Np-TTT composite film (∼800 nm-thick) that was annealed at 250 • C for 1 h exhibited the highest areal specific capacity of 440 μAh cm −2 at the 1 st cycle, a high retention of 95% from the 2 nd to the 50 th cycles, and a Coulombic efficiency of approximately 100%. The enhanced capacities of the Np-TTT composite films can be primarily attributed to the synergetic effect of the inclusion of conductive TiN component in bulk TiO 2 matrix films, the active TiO with quasi-crystalline cubic phase, and nanoporous structure with high surface area. Rechargeable lithium-ion batteries (LIBs) are considered one of the most important energy storage device and widely used in various potable electronic devices like mobile phones, cameras, and laptops, owing to their superior energy densities (120-180 W h kg -1 ), low memory effect, long life cycle, and low environmental impacts. 1-3Currently, their applications are quickly expanding to electric vehicles (EVs) and plug-in hybrid electric vehicles (HEVs), where much higher energy densities (above 500 W h kg -1 ) are necessary to supply sufficient power for long-distance driving, accelerating a vehicle quickly, and recovering energy during braking. [4][5][6] However, the safety issue of LIBs is becoming a severe problem because the conventional graphite anode (0.1 V vs. Li + /Li) is prone to experience the growth of lithium dendrites after repetitive charge/discharge, which hinders the development of large-capacity LIBs in EV and HEV applications. 4,6,7 Titanium dioxide materials have attracted increasing attention as promising LIB anode materials for replacing conventional graphite anodes owing to their superior features such as safety improvement, low cost, cycling stability, and satisfactory chemical and thermal stabilities.3,7-14 Particularly, TiO 2 exhibits very small volume expansion (<4%) and, more importantly, operates at a relatively high working voltage (1.7 V vs. Li/Li + ) during Li + insertion/extraction, which eliminates the influence of the solid electrolyte interface layer and avoids the risk of lithium electrodeposition from electrolytes in LIBs, thus further ensuring the cycling stability and safety of batteries. However, the poor Li ion diffusivity and low electronic conductivity of TiO 2 ma...

show abstract

“…Bipolar electrochemistry is a general phenomenon used to trigger electrochemical reactions on the surface of conductive objects without the need for contacting them with electrical wires . It is currently attracting a strong interest in the fields of materials science, analytical chemistry, motion generation and seawater desalination . The development of devices allowing signal computation in fluidic and chemical systems is also of particular scientific interest, with a focus on molecular, microfluidic and electrochemical systems .…”

Section: Figurementioning

confidence: 99%

“…Finally,w es how that the input electrical potential can be considerably lowered in the presence of the Fe III (CN) 6 3À /Fe II (CN) 6 4À redoxc ouple in solution.Bipolar electrochemistry is ageneral phenomenon used to trigger electrochemical reactions on the surfaceo fc onductive objects without the need for contacting themw ith electrical wires. [1] It is currently attracting as trong interest in the fields of materials science, [2][3][4][5][6][7][8][9][10][11][12] analytical chemistry, [13][14][15][16][17][18][19][20][21][22][23][24] motion generation [2,25,26] and seawater desalination. [27] The development of devices allowing signal computation in fluidic and chemical systemsi sa lso of particular scientific interest, [28][29][30][31][32] with af ocus on molecular, [30,[33][34][35][36] microfluidic [31,37,38] and electrochemical systems.…”

mentioning

confidence: 99%

Light‐Driven Bipolar Electrochemical Logic Gates with Electrical or Optical Outputs

Loget

Fabre

2015

ChemElectroChem

View full text Add to dashboard Cite

International audienceWe present the design of AND and OR logic gates made with silicon and carbon materials and operated by bipolar electrochem. Such devices require elec. and light inputs to function and generate an elec. output or, alternatively, an optical output that can be readily obsd. with the naked eye. These operators are stable over time and can work in a wide range of electrolyte concns. Finally, we show that the input elec. potential can be considerably lowered in the presence of the FeIII(CN)63-/FeII(CN)64- redox couple in soln

show abstract

Hybrid Energy Storage Devices Based on Monolithic Electrodes Containing Well-defined TiO2 Nanotube Size Gradients

Cited by 29 publications

References 39 publications

On the Capacity Losses Seen for Optimized Nano‐Si Composite Electrodes in Li‐Metal Half‐Cells

On the Capacity Losses Seen for Optimized Nano‐Si Composite Electrodes in Li‐Metal Half‐Cells

Tailoring of Morphology and Crystalline Structure of Nanoporous TiO₂–TiO–TiN Composite Films for Enhanced Capacity as Anode Materials of Lithium-Ion Batteries

Light‐Driven Bipolar Electrochemical Logic Gates with Electrical or Optical Outputs

Contact Info

Product

Resources

About

Hybrid Energy Storage Devices Based on Monolithic Electrodes Containing Well-defined TiO2 Nanotube Size Gradients

Cited by 29 publications

References 39 publications

On the Capacity Losses Seen for Optimized Nano‐Si Composite Electrodes in Li‐Metal Half‐Cells

On the Capacity Losses Seen for Optimized Nano‐Si Composite Electrodes in Li‐Metal Half‐Cells

Tailoring of Morphology and Crystalline Structure of Nanoporous TiO2–TiO–TiN Composite Films for Enhanced Capacity as Anode Materials of Lithium-Ion Batteries

Light‐Driven Bipolar Electrochemical Logic Gates with Electrical or Optical Outputs

Contact Info

Product

Resources

About

Tailoring of Morphology and Crystalline Structure of Nanoporous TiO₂–TiO–TiN Composite Films for Enhanced Capacity as Anode Materials of Lithium-Ion Batteries