Nanostructuring one-dimensional and amorphous lithium peroxide for high round-trip efficiency in lithium-oxygen batteries

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The major challenge facing lithium-oxygen batteries is the insulating and bulk lithium peroxide discharge product, which causes sluggish decomposition and increasing overpotential during recharge. Here, we demonstrate an improved round-trip efficiency of similar to 80% by means of a mesoporous carbon electrode, which directs the growth of one-dimensional and amorphous lithium peroxide. Morphologically, the one-dimensional nanostructures with small volume and high surface show improved charge transport and promote delithiation (lithium ion dissolution) during recharge and thus plays a critical role in the facile decomposition of lithium peroxide. Thermodynamically, density functional calculations reveal that disordered geometric arrangements of the surface atoms in the amorphous structure lead to weaker binding of the key reaction intermediate lithium superoxide, yielding smaller oxygen reduction and evolution overpotentials compared to the crystalline surface. This study suggests a strategy to enhance the decomposition rate of lithium peroxide by exploiting the size and shape of one-dimensional nanostructured lithium peroxide.
Publisher
Nature
Issue Date
2018-02
Language
English
Article Type
Article
Keywords

NONAQUEOUS LI-O-2 BATTERIES; AUGMENTED-WAVE METHOD; CHARGE-TRANSPORT; OXIDE SURFACES; REDOX MEDIATOR; AIR BATTERIES; LI2O2; CARBON; NANOPARTICLES; EVOLUTION

Citation

Nature Communications, v.9, pp.680

ISSN
2041-1723
DOI
10.1038/s41467-017-02727-2
URI
http://hdl.handle.net/10203/240620
Appears in Collection
EEW-Journal Papers(저널논문)CH-Journal Papers(저널논문)
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