2022
DOI: 10.1002/aenm.202200580
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High‐Performance Li‐O2 Batteries Enabled by Dibenzo‐24‐Crown‐8 Aldehyde Derivative as Electrolyte Additives

Abstract: Aprotic Li‐O2 batteries (LOB) with high theoretical energy density usually experience cathode clogging by insoluble Li2O2, along with high charge overpotential from its insulating nature. A dibenzo‐24‐crown‐8 aldehyde derivative (DB24C8A) is employed as an additive to enhance the binding strength with Li+, hence promoting the solubility of Li2O2. The generated [DB24C8A•Li+] avoids the parasitic reactions caused by reactive O2−. Thus, the LOB achieves a large discharge capacity of 6939 mAh g−1 at 200 mA g−1 and… Show more

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Cited by 18 publications
(16 citation statements)
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“…An illustration of fitting equivalent circuit is represented as the inset. Much lower charge transfer impedance value (R ct ) with PTFEMA-contained electrolyte (136 Ω; base electrolyte: 165 Ω) after 20 cycles supports an accelerated charge transfer and enhanced electrochemical kinetic in Li-O 2 cell, [6,36] which is consistent with the experimental and analytical results of enhanced OER process (Figures 2g and 3d,e). The accumulation of incompletely decomposed Li 2 O 2 product and poor conductivity of side products (such as Li 2 CO 3 ) on the cathode side can result in the passivation of GDL and growth of charge-transfer resistance, causing an increased chargetransfer impedance in EIS plot.…”
Section: Electrochemical Performance Of Lobssupporting
confidence: 84%
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“…An illustration of fitting equivalent circuit is represented as the inset. Much lower charge transfer impedance value (R ct ) with PTFEMA-contained electrolyte (136 Ω; base electrolyte: 165 Ω) after 20 cycles supports an accelerated charge transfer and enhanced electrochemical kinetic in Li-O 2 cell, [6,36] which is consistent with the experimental and analytical results of enhanced OER process (Figures 2g and 3d,e). The accumulation of incompletely decomposed Li 2 O 2 product and poor conductivity of side products (such as Li 2 CO 3 ) on the cathode side can result in the passivation of GDL and growth of charge-transfer resistance, causing an increased chargetransfer impedance in EIS plot.…”
Section: Electrochemical Performance Of Lobssupporting
confidence: 84%
“…A negative adsorption energy value (∆ E ad = −7.8 eV) of optimized GDL‐PTFEMA structure can be obtained (Figure 2b), which indicates not only thermodynamic feasibility but also strong adsorption behavior between GDL and PTFEMA (GDL‐PTFEMA). [ 19,36 ] The negative adsorption energy (∆ E ad = −0.89 eV) of the PTFEMA‐Li + complex further confirms the ability of PTFEMA to solvate Li + (Figure 2c). PTFEMA molecules dissolved in the electrolyte can be uniformly adsorbed on the GDL substrate due to the strong interaction.…”
Section: Resultsmentioning
confidence: 59%
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“…The most obvious promotion effect was observed in cell with the 100‐18C6 electrolyte. Moreover, the oxidation peak ascribed to electrolyte or KB cathode decomposition shifted to higher potential of 4.438 V in cell with 100‐18C6 electrolyte, compared with 4.371 V in the cell without additive, indicating the broadened electrochemical stability of 100‐18C6 electrolyte [17] . Figure 2k shows the EIS results of cells with 100‐18C6 electrolyte after first discharging and charging.…”
Section: Resultsmentioning
confidence: 99%