Self-discharge in rechargeable electrochemical energy storage devices

Babu, Binson

doi:10.1016/j.ensm.2024.103261

Cited by 9 publications

(1 citation statement)

References 251 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Self-discharge is pronounced in electrochemical capacitors that use redox-active electrolytes, due to the diffusion of soluble redox-active species. , To suppress the diffusion of these species between the anode and cathode, two strategies were employed: the use of ion-exchange membranes as separators and redox compounds that dissolve into ions in the electrolyte but can be converted into solid species on the electrode surface upon charging . However, the former strategy is hampered by high costs and an increase in internal resistance.…”

Section: Resultsmentioning

confidence: 99%

Utilizing Activated Carbon Nanopores for Electrochemical Oxidation of Perylene to Redox-Active 3,10-Perylenedione: Application in Electrochemical Capacitor Electrodes

Itoi,

Takagi,

Usami

et al. 2024

Langmuir

View full text Add to dashboard Cite

We demonstrate that nanopores of activated carbon (AC) function as nanoreactors that oxidize perylene (PER) to a redox-active organic compound, 3,10-perylenedione (PERD), without any metal catalysts or organic solvents. PER is first adsorbed on AC in the gas phase, and the PER-adsorbed AC is subjected to electrochemical oxidation in aqueous H 2 SO 4 as the electrolyte. Because gas-phase adsorption is solvent-free, PER is completely adsorbed on AC as long as the amount of PER does not exceed the saturated adsorption capacity of the AC, which enables accurate control of the amount adsorbed. PER is electrochemically oxidized to PERD in the nanopores of AC at above 0.7 V vs Ag/AgCl. The hybridized PERD undergoes a rapid reversible two-electron redox reaction in the nanopores owing to the large contact interface between the conductive carbon pore surfaces and PERD. The resulting AC/PERD hybrids serve as electrodes for electrochemical capacitors, utilizing the rapid redox reaction of PERD. The hybridization method is advantageous for quantitatively optimizing electrochemical capacitor performance by adjusting the amount of adsorbed PER. Moreover, because PERD hybridization in the AC nanopores does not expand the electrode volume, the volumetric capacitance increases with increasing hybridized PERD content. In three-electrode cell measurements, the volumetric capacitance at 0.05 A g −1 reaches 299 F cm −3 , and 61% of this capacitance is retained at 10 A g −1 when 5 mmol of PER is used per gram of AC. Meanwhile, pristine AC delivers 117 F cm −3 at 0.05 A g −1 with a capacitance retention of 46% at 10 A g −1 . Two-electrode cell measurements reveal that self-discharge is significantly suppressed by the hybridized PERD when AC/PERD hybrids and AC are used as cathodes and anodes, respectively, compared to that of a symmetrical AC cell. Moreover, PERD does not undergo cross-diffusion in the asymmetrical cells during self-discharge tests for 24 h.

show abstract

Section: Resultsmentioning

confidence: 99%

Utilizing Activated Carbon Nanopores for Electrochemical Oxidation of Perylene to Redox-Active 3,10-Perylenedione: Application in Electrochemical Capacitor Electrodes

Itoi,

Takagi,

Usami

et al. 2024

Langmuir

View full text Add to dashboard Cite

show abstract

Design and Functionalization of Lignocellulose‐Derived Silicon‐Carbon Composites for Rechargeable Batteries

Li,

Xu,

Wang

et al. 2024

Advanced Energy Materials

View full text Add to dashboard Cite

Silicon/carbon (Si/C) composites present great potential as anode materials for rechargeable batteries since the materials integrate the high specific capacity and the preferable cycling stability from Si and C components, respectively. Functional Si/C composites based on lignocellulose have attracted wide attention due to the advantages from lignocellulose, including sustainability property, flexible structural tunability, and diverse physicochemical functionality. Although the flourishing development of rechargeable batteries boosts the studies on lignocellulose‐derived Si/C materials with high electrochemical performance, the publications that comprehensively clarify the design and functionalization of these high‐profile materials are still scarce. Accordingly, this review first systematically summarizes the recent advances in the structural design of lignocellulose‐derived Si/C composites after a brief clarification about the Si selection sources based on self and extraneous sources. Afterward, the functionalization strategies, including nanosizing, porosification, and magnesiothermic reduction of Si material as well as heteroatom modification of C material, are specifically highlighted. Besides, the applications of lignocellulose‐derived Si/C‐based materials in rechargeable batteries are elaborated. Finally, this review discusses the challenges and prospects of the application of lignocellulose‐derived Si/C composites for energy storage and provides a nuanced viewpoint regarding this topic.

show abstract

X‐Ray Absorption and X‐Ray Emission Spectroscopy Study of a Molybdenum Disulfide Anode in a Sodium‐Ion Half‐Cell

Bulusheva,

Zaguzina,

Fedorenko

et al. 2024

Physica Status Solidi (b)

View full text Add to dashboard Cite

The development of efficient anodes for sodium‐ion batteries requires a deep understanding of the electrochemical processes involved. Herein, X‐ray spectroscopy is used to study changes in the electronic structure of MoS2 nanosheets coupled with few‐layered graphene at early stages of battery life. Working electrode is combined with a sodium plate and a solution of NaClO4 in ethyl carbonate/dimethyl carbonate in a homemade cell having an X‐ray transparent window. X‐ray absorption spectra at the S K‐edge and Mo L3‐edge are recorded using a synchrotron source, X‐ray emission S Kα and Mo Lα spectra are obtained on a laboratory spectrometer for initial powder and electrode material at different potentials of the cell. Analysis of the spectra shows the occupation of the initially empty orbitals of MoS2 by sodium electrons as a result of the interaction of the components of the sodium‐ion half‐cell. Ex situ X‐ray photoelectron spectroscopy measurements of a fully discharged electrode material reveal partial transformation of hexagonal MoS2 to disordered tetragonal MoS2 coated with a surface electrolyte interphase layer. The obtained results indicate that coupling MoS2 to graphene prevents the breaking of Mo–S bonds when Na+ ions are first introduced, which may promote stable battery performance.

show abstract

Self-discharge in rechargeable electrochemical energy storage devices

Cited by 9 publications

References 251 publications

Utilizing Activated Carbon Nanopores for Electrochemical Oxidation of Perylene to Redox-Active 3,10-Perylenedione: Application in Electrochemical Capacitor Electrodes

Utilizing Activated Carbon Nanopores for Electrochemical Oxidation of Perylene to Redox-Active 3,10-Perylenedione: Application in Electrochemical Capacitor Electrodes

Design and Functionalization of Lignocellulose‐Derived Silicon‐Carbon Composites for Rechargeable Batteries

X‐Ray Absorption and X‐Ray Emission Spectroscopy Study of a Molybdenum Disulfide Anode in a Sodium‐Ion Half‐Cell

Contact Info

Product

Resources

About