10.1002/anie.201812983
Angewandte Chemie International Edition
COMMUNICATION
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amount of O2 was released from DME (Figure 5a) and DOL
(Figure 5b) based cells, demonstrating lower round-trip efficiency
and poor reversibility. For the DME-based cell, remarkable CO2
release was observed in later charge process, which is possibly
due to decomposition of carbonates or alkyl carbonates (Scheme
2). The same situation exists in tetraethylene glycol dimethyl ether
(TEGDME) or DOL based cells due to similar decomposition
mechanism (Figure 5c). In contrast, for HMD electrolyte, the
amount of oxygen generated in the charging process was the
highest among all electrolytes, and no CO2 evolution was
detected (Figure 4d). Thus, we draw a conclusion that HMD has
the highest stability.
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Figure 5. DEMS profiles of cells with (a) DME, (b) DOL, (c) TEGDME and (d)
HMD based electrolytes during charge process.
In summary, a fully methylated cyclic ether 2,2,4,4,5,5-
hexamethyl-1,3-dioxolane was synthesized and studied as a
stable electrolyte solvent for LOB. Because all of the reactive α-H
atoms in the ether are substituted with methyl groups, the oxygen
species caused hydrogen abstraction reaction is totally eliminated.
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the Li anode, the cycle life of LOB based on HMD electrolyte is
elongated fourfold comparing with conventional DME or DOL
electrolyte. The discovery in the present work makes the LOBs
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Acknowledgements
This work was supported by the National Natural Science
Foundation of China (Grant Nos. 51672098 and 51632001). The
authors acknowledge the Analytical and Testing Center of
Huazhong University of Science and Technology for SEM, and
XRD, FTIR and NMR measurement.
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Key words: lithium oxygen battery • electrolyte • methylated
ether • cycling stabilty
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