Electrochemical investigation of PVDF: HFP gel polymer electrolytes for quasi-solid-state Li-O2 batteries: effect of lithium salt type and concentration

Çeli̇k, Mustafa Yavuz; Kızılaslan, Abdulkadir; Can, Mustafa; Çetinkaya, Tuğrul; Akbulut, Hatem

doi:10.1016/j.electacta.2021.137824

Cited by 39 publications

(34 citation statements)

References 61 publications

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“…Such a phenomenon was not verified in the cell containing the 5 wt% NS CGPE, where the discharge and charge capacity values were very stable over the first 10 cycles. Another important fact to keep in mind is that constant O 2 flow leads to the intense evaporation of LE in the system [36]. Compared to LE, the 5 wt% NS CGPE almost doubles the t Li+ value and decreases the recharge potential, thus enhancing the cycle stability.…”

Section: Resultsmentioning

confidence: 99%

Nanosponge-Based Composite Gel Polymer Electrolyte for Safer Li-O2 Batteries

et al. 2021

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Li-O2 batteries represent a promising rechargeable battery candidate to answer the energy challenges our world is facing, thanks to their ultrahigh theoretical energy density. However, the poor cycling stability of the Li-O2 system and, overall, important safety issues due to the formation of Li dendrites, combined with the use of organic liquid electrolytes and O2 cross-over, inhibit their practical applications. As a solution to these various issues, we propose a composite gel polymer electrolyte consisting of a highly cross-linked polymer matrix, containing a dextrin-based nanosponge and activated with a liquid electrolyte. The polymer matrix, easily obtained by thermally activated one pot free radical polymerization in bulk, allows to limit dendrite nucleation and growth thanks to its cross-linked structure. At the same time, the nanosponge limits the O2 cross-over and avoids the formation of crystalline domains in the polymer matrix, which, combined with the liquid electrolyte, allows a good ionic conductivity at room temperature. Such a composite gel polymer electrolyte, tested in a cell containing Li metal as anode and a simple commercial gas diffusion layer, without any catalyst, as cathode demonstrates a full capacity of 5.05 mAh cm−2 as well as improved reversibility upon cycling, compared to a cell containing liquid electrolyte.

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Section: Resultsmentioning

confidence: 99%

Nanosponge-Based Composite Gel Polymer Electrolyte for Safer Li-O2 Batteries

et al. 2021

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“…Likewise, the existence of polymer matrix in QPE could also make the ionic conduction mechanism different from that of liquid electrolyte. Furthermore, Li + migration in QPE is not detectable directly by some related spectra/microscopes, resulting in unclear ionic conduction mechanism [12–19] . In addition, some queries have perplexed researchers for decades, such as the existential form of solvent molecules, interactions between different components and solvated structure of Li + in QPE [20] .…”

Section: Figurementioning

confidence: 99%

Insights into the Ionic Conduction Mechanism of Quasi‐Solid Polymer Electrolytes through Multispectral Characterization

Hou

et al. 2021

Angewandte Chemie

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Quasi‐solid polymer electrolytes (QPE) composed of Li salts, polymer matrix, and solvent, are beneficial for improving the security and energy density of batteries. However, the ionic conduction mechanism, existential form of solvent molecules, and interactions between different components of QPE remain unclear. Here we develop a multispectral characterization strategy combined with first‐principles calculations to unravel aforesaid mysteries. The results indicate that the existential state of solvent in QPE is quite different from that in liquid electrolyte. The Li cations in gel polymer electrolyte are fully solvated by partial solvent molecules to form a local high concentration of Li+, while the other solvent molecules are fastened by polymer matrix in QPE. As a result, the solvation structure and conduction mechanism of Li+ are similar to those in high‐concentrated liquid electrolyte. This work provides a new insight into the ionic conduction mechanism of QPE and will promote its application for safe and high‐energy batteries.

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“…Despite their promising future, these systems are still in a research stage, due to their limited cyclability as a result of parasitic reactions that occur between the cathode and the electrolyte during the successive charging and discharging processes [1]. These products come more specifically from decomposition of solvent [2], electrolyte [3,4], the carbon [5] and the binder [6]. These unwanted reactions decrease the capacity and efficiency of the battery.…”

Section: Introductionmentioning

confidence: 99%

BRIEF STUDY ON THE DECOMPOSITION OF TETRAETHYLENE GLYCOL DIMETHYL ETHER (TEGDME) SOLVENT IN THE PRESENCE OF Li2O2 AND H2O2

Márquez

Moncada‐Basualto

Olea‐Azar

et al. 2021

J. Chil. Chem. Soc.

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In this work, the decomposition of the solvent tetraethylene glycol dimethyl ether (TEGDME) was studied under conditions that simulate the charge of a Li-O2 cell in the presence and absence of hydrogen peroxide and lithium peroxide by means of electron spin resonance spectroscopy (ESR). We detected the formation of radical species, although in low concentrations, originating from solvent decomposition reactions during the oxidation process, in the absence of peroxides. On the other hand, by introducing H2O2 and H2O into the system, oxygen-centered superoxide and hydroxyl radical species were detected. Furthermore, in the presence of Li-O2, carbon-centered radical species were detected which clearly show the decomposition of the solvent. Finally, the results show that it is very important that the charging process of a Li-O2 cell is carried out by direct oxidation via 2 eto Li2O2 to avoid the formation of radical species that the decomposition of the solvent.

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Electrochemical investigation of PVDF: HFP gel polymer electrolytes for quasi-solid-state Li-O2 batteries: effect of lithium salt type and concentration

Cited by 39 publications

References 61 publications

Nanosponge-Based Composite Gel Polymer Electrolyte for Safer Li-O2 Batteries

Nanosponge-Based Composite Gel Polymer Electrolyte for Safer Li-O2 Batteries

Insights into the Ionic Conduction Mechanism of Quasi‐Solid Polymer Electrolytes through Multispectral Characterization

BRIEF STUDY ON THE DECOMPOSITION OF TETRAETHYLENE GLYCOL DIMETHYL ETHER (TEGDME) SOLVENT IN THE PRESENCE OF Li2O2 AND H2O2

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