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ACS Nano. 2018 May 22;12(5):4419-4430. doi: 10.1021/acsnano.8b00348. Epub 2018 May 4.

Two-Dimensional Phosphorene-Derived Protective Layers on a Lithium Metal Anode for Lithium-Oxygen Batteries.

Author information

1
School of Chemical and Biological Engineering, Institute of Chemical Processes , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea.
2
Department of Physics , Pukyong National University , 45 Yongso-ro , Nam-Gu, Busan 48513 , Republic of Korea.
3
Department of Chemistry , Incheon National University , 119 Academy-ro, Songdo-dong , Yeonsu-gu, Incheon 22012 , Republic of Korea.
4
Advanced Materials Division , Korea Research Institute of Chemical Technology , Yuseong, Daejeon 34114 , Republic of Korea.
5
Environment and Energy Research Team, Division of Automotive Research and Development , Hyundai Motor Company , 37 Cheoldobangmulgwan-ro , Uiwang , Gyeonggi-do 16082 , Republic of Korea.
6
Future Technology Research Center, CRD , LG Chem, Ltd. , 188 Munji-ro , Yuseong-gu, Daejeon 34122 , Republic of Korea.
7
Department of Energy and Materials Engineering , Dongguk University-Seoul , Seoul 04620 , Republic of Korea.

Abstract

Lithium-oxygen (Li-O2) batteries are desirable for electric vehicles because of their high energy density. Li dendrite growth and severe electrolyte decomposition on Li metal are, however, challenging issues for the practical application of these batteries. In this connection, an electrochemically active two-dimensional phosphorene-derived lithium phosphide is introduced as a Li metal protective layer, where the nanosized protective layer on Li metal suppresses electrolyte decomposition and Li dendrite growth. This suppression is attributed to thermodynamic properties of the electrochemically active lithium phosphide protective layer. The electrolyte decomposition is suppressed on the protective layer because the redox potential of lithium phosphide layer is higher than that of electrolyte decomposition. Li plating is thermodynamically unfavorable on lithium phosphide layers, which hinders Li dendrite growth during cycling. As a result, the nanosized lithium phosphide protective layer improves the cycle performance of Li symmetric cells and Li-O2 batteries with various electrolytes including lithium bis(trifluoromethanesulfonyl)imide in N,N-dimethylacetamide. A variety of ex situ analyses and theoretical calculations support these behaviors of the phosphorene-derived lithium phosphide protective layer.

KEYWORDS:

lithium metal; lithium phosphide; lithium-oxygen batteries; phosphorene; protective layers

PMID:
29714999
DOI:
10.1021/acsnano.8b00348

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