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Marginal Magnesium Doping for High‐Performance Lithium Metal Batteries
Author(s) -
Choi Seung Ho,
Lee Seung Jong,
Yoo DongJoo,
Park Jun Ho,
Park JaeHyuk,
Ko You Na,
Park Jungjin,
Sung YungEun,
Chung SungYoon,
Kim Heejin,
Choi Jang Wook
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902278
Subject(s) - materials science , plating (geology) , anode , doping , whisker , magnesium , lithium (medication) , metal , battery (electricity) , foil method , electrode , nanotechnology , metallurgy , composite material , optoelectronics , medicine , power (physics) , chemistry , physics , quantum mechanics , endocrinology , geophysics , geology
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.