The urgent need for efficient energy storage devices has stimulated a great deal of research on electrochemical double layer capacitors (EDLCs). This review aims at summarizing the recent progress in nanoporous carbons, as the most commonly used EDLC electrode materials in the field of capacitive energy storage, from the viewpoint of materials science and characterization techniques. We discuss the key advances in the fundamental understanding of the charge storage mechanism in nanoporous carbon-based electrodes, including the double layer formation in confined nanopores. Special attention will be also paid to the important development of advanced in situ analytical techniques as well as theoretical studies to better understand the carbon pore structure, electrolyte ion environment and ion fluxes in these confined pores. We also highlight the recent progress in advanced electrolytes for EDLCs. The better understanding of the charge storage mechanism of nanoporous carbon-based electrodes and the rational design of electrolytes should shed light on developing the next-generation of EDLCs.

https://hal.archives-ouvertes.fr/hal-03054287/document

Nanoporous carbon for electrochemical capacitive energy storage

Energy Storage Mechanism, Challenge and Design Strategies of Metal Sulfides for Rechargeable Sodium/Potassium-Ion Batteries

ZnS has great potentials as an anode for lithium storage because of its high theoretical capacity and resource abundance; however, the large volume expansion accompanied with structural collapse and low conductivity of ZnS cause severe capacity fading and inferior rate capability during lithium storage. Herein, 0D-2D ZnS nanodots/Ti3C2Tx MXene hybrids are prepared by anchoring ZnS nanodots on Ti3C2Tx MXene nanosheets through coordination modulation between MXene and MOF precursor (ZIF-8) followed with sulfidation. The MXene substrate coupled with the ZnS nanodots can synergistically accommodate volume variation of ZnS over charge–discharge to realize stable cyclability. As revealed by XPS characterizations and DFT calculations, the strong interfacial interaction between ZnS nanodots and MXene nanosheets can boost fast electron/lithium-ion transfer to achieve excellent electrochemical activity and kinetics for lithium storage. Thereby, the as-prepared ZnS nanodots/MXene hybrid exhibits a high capacity of 726.8 mAh g−1 at 30 mA g−1, superior cyclic stability (462.8 mAh g−1 after 1000 cycles at 0.5 A g−1), and excellent rate performance. The present results provide new insights into the understanding of the lithium storage mechanism of ZnS and the revealing of the effects of interfacial interaction on lithium storage performance enhancement.

/pdf/mof-derived-zns-nanodots-ti3c2tx-mxene-hybrids-boosting-1rv4kbkejy.pdf

MOF-Derived ZnS Nanodots/Ti3C2Tx MXene Hybrids Boosting Superior Lithium Storage Performance.

Recent trends in electrolytes for supercapacitors

New types of hybrid electrolytes for supercapacitors

Novel electrolyte consisting of ethyl 1,1,2,2-tetrafluoroethyl ether (ETFE), conventional ether 1,3-dioxolane (DOL) and film-forming additive LiFSI was investigated for rechargeable lithium sulfur batteries It is found that the addition of LiFSI promotes ionic conduction, reduces polysulfide solubility in the electrolyte, and enhances the compatibility of the electrolyte with metallic Li Consequently, increased reversible capacity, improved cycle stability and rate capability are exhibited in an additive-contained fluorinated electrolyte with moderate amount of DOL It further reveals that the synergistic function of the fluorinated ether and LiFSI greatly modify and stabilize Li surface However, rich DOL employed in the fluorinated electrolyte results in excessive polysulfide dissolution and inferior interface quality despite the raised ionic conductivity, which is unfavorable for the overall cell performance instead even though the additive was employed

LiFSI as a functional additive of the fluorinated electrolyte for rechargeable Li-S batteries

Synergistic Effect of Fluorinated Solvents for Improving High Voltage Performance of LiNi 0.5 Mn 1.5 O 4 Cathode

Advanced Perfluorinated Electrolyte with Synergistic Effect of Fluorinated Solvents for High-Voltage LiNi0.5Mn1.5O4/Li cell

In the original version of this article, the title has been published incorrectly. The correct title should read as above “LiFSI as a functional additive of the fluorinated electrolyte for rechargeable Li-S batteries”.

/pdf/correction-to-lifsi-as-a-functional-additive-of-the-44uzrv6fn4.pdf

Correction to: LiFSI as a functional additive of the fluorinated electrolyte for rechargeable Li-S batteries

High-voltage lithium cobalt oxide (LCO) cathode material always suffers from rapid capacity decay due to irreversible phase transition and unexpected parasitic reactions between the charged LCO and conventional carbonate electrolyte. Here, a series of fluorinated electrolytes containing single or multiple fluorinated solvents were sought to match the high-voltage LCO cathode. The effects of regulating solvent components on the electrolyte properties, interfacial chemistry on both LCO cathode and mesocarbon microbead (MCMB) anode, and electrochemical performance of the LCO/MCMB cell were investigated. It is found that the synergistic effect of the fluorinated solvents obviously improves the reversible capacity and cycle capability for various half/full cell construction, in virtue of enhanced oxidation resistivity of the electrolyte and moderately-modified surface film on the cathode/anode. A novel perfluorinated electrolyte entirely consisting of fluorinated carbonate and fluorinated ether offers superior overall performance for the LCO/MCMB full cell at the upper cut-off voltage of 4.45 V.

/pdf/improved-electrochemical-performance-of-a-licoo2-mcmb-cell-1b06he54dd.pdf

Improved electrochemical performance of a LiCoO2/MCMB cell by regulating fluorinated electrolytes

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