journal article May 08, 2022

High‐Performance Li‐O2 Batteries Enabled by Dibenzo‐24‐Crown‐8 Aldehyde Derivative as Electrolyte Additives

View at Publisher Save 10.1002/aenm.202200580
Abstract
AbstractAprotic 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 a high Li2O2 yield (≈93%). Moreover, DB24C8A facilitates the efficient decomposition of Li2O2 via Li+ coordination during the charge process, reducing the charge overpotential to 0.77 V and prolonging the lifetime of the LOB over 213 cycles at 1000 mAh g−1 and 500 mA g−1. This work provides a novel approach to boost the performance of LOB by incorporation of crown ether‐based compounds to regulate the Li2O2 growth and decomposition pathway.
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25
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51
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Details
Published
May 08, 2022
Vol/Issue
12(26)
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Authors
Funding
Ministry of Education - Singapore Award: MOE2017‐T2‐2‐052
Cite This Article
Qi Zhang, Sijia Rao, Sai Vikrama Chaitanya Vummaleti, et al. (2022). High‐Performance Li‐O2 Batteries Enabled by Dibenzo‐24‐Crown‐8 Aldehyde Derivative as Electrolyte Additives. Advanced Energy Materials, 12(26). https://doi.org/10.1002/aenm.202200580