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

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 co...

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Detalles Bibliográficos
Autores principales: Kim, Mun Sek, Deepika, Lee, Seung Hun, Kim, Min-Seop, Ryu, Ji-Hyun, Lee, Kwang-Ryeol, Archer, Lynden A., Cho, Won Il
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6814371/
https://www.ncbi.nlm.nih.gov/pubmed/31692811
http://dx.doi.org/10.1126/sciadv.aax5587
Descripción
Sumario: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 MoS(2) interphases are paired with 4.1 mAh cm(−2) LiNi(0.8)Co(0.1)Mn(0.1)O(2) cathodes. These studies reveal that small- and larger-format (196 mAh, 294 Wh kg(−1), and 513 Wh liter(−1)) cells based on protected LiAl anodes exhibit high reversibility and support stable Li migration during recharge of the cells.