Enabling reversible redox reactions in electrochemical cells using protected LiAl intermetallics as lithium metal anodes

Title
Enabling reversible redox reactions in electrochemical cells using protected LiAl intermetallics as lithium metal anodes
Authors
조원일이광렬Deepika이승훈Mun Sek KimMin-Seop KimJi-Hyun RyuLynden A. Archer
Keywords
Li metal battery; LiAl anode; artificial solid electrolyte interphase; MoS2; NCM811 cathofr
Issue Date
2019-10
Publisher
Science Advances
Citation
VOL 5, NO 10-eaax5587-15
Abstract
Rechargeable electrochemical cells with metallic anodes are of increasing scientific and technological interest. The complex composition, poorly defined morphology, heterogeneous chemistry, and unpredictable mechanics of interphases formed spontaneously on the anodes are often examined but rarely controlled. Here, we couple computational studies with experimental analysis of well-defined LiAl electrodes in realistic electrochemical environments to design anodes and interphases of known composition. We compare phase behavior, Li binding energies, and activation energy barriers for adatom transport and study their effects on the electrochemical reversibility of battery cells. As an illustration of potential practical benefits of our findings, we create cells in which LiAl anodes protected by Langmuir-Blodgett MoS2 interphases are paired with 4.1 mAh cm− 2 LiNi0.8Co0.1Mn0.1O2 cathodes. These studies reveal that small- and larger-format (196 mAh, 294Wh kg− 1, and 513Wh liter− 1) cells based on protected LiAl anodes exhibit high reversibility and support stable Li migration during recharge of the cells.
URI
http://pubs.kist.re.kr/handle/201004/70375
ISSN
2375-2548
Appears in Collections:
KIST Publication > Article
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