Marginal Magnesium Doping for High-Performance Lithium Metal Batteries

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Due to unparalleled theoretical capacity and operation voltage, metallic Li is considered as the most attractive candidate for lithium-ion battery anodes. However, Li metal electrodes suffer from uncontrolled dendrite growth and consequent interfacial instability, which result in an unacceptable level of performance in cycling stability and safety. Herein, it is reported that a marginal amount (1.5 at%) of magnesium (Mg) doping alters the surface properties of Li metal foil drastically in such a way that upon Li plating, a highly dense Li whisker layer is induced, instead of sharp dendrites, with enhanced interfacial stability and cycling performance. The effect of Mg doping is explained in terms of increased surface energy, which facilitates plating of Li onto the main surface over the existing whiskers. The present study offers a useful guideline for Li metal batteries, as it largely resolves the longstanding shortcoming of Li metal electrodes without significantly sacrificing their main advantages.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2019-11
Language
English
Article Type
Article
Citation

ADVANCED ENERGY MATERIALS, v.9, no.41, pp.1902278

ISSN
1614-6832
DOI
10.1002/aenm.201902278
URI
http://hdl.handle.net/10203/270037
Appears in Collection
EEW-Journal Papers(저널논문)
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