Tackling issues of lithium metal anodes with a novel polymeric lithicone coating
- Univ. of Arkansas, Fayetteville, AR (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Univ. of Arkansas, Little Rock, AR (United States)
Lithium metal (Li) has been hindered from as anodes in commercial batteries for over 50 years, due to two main issues: continuous formation of solid electrolyte interphase (SEI) and lithium dendritic growth. In this work, we report a new strategy to tackle these issues, i.e., using molecular layer deposition (MLD) to grow an ionically conducting but electrically insulating polymeric lithicone coating, an Li-containing triethanolamine (LiTEA). Our electrochemical tests revealed that this LiTEA coating could serve as an exceptional protection layer over Li anodes. Consequently, the LiTEA-coated Li electrodes could achieve a superior cyclability of > 10000 Li stripping/plating cycles at a current density of 5 mA cm-2 and a long cyclability of > 5500 cycles at 2 mA cm-2 in Li||Li symmetric cells without failures, under a fixed areal capacity of 1 mAh cm-2. Characterizations using scanning electron microscopy and X-ray photoelectron microscopy verified that Li+ ions could be easily extracted through and deposited under the LiTEA coating during the stripping/plating processes. Consequently, this LiTEA coating significantly inhibited the formation of SEI and Li dendrites. This underlies the long cycling lifetime of the LiTEA-coated Li||Li cells. Coupling with the nickel-rich LiNi0.8Mn0.1Co0.1O2 (NMC811) cathodes, more encouragingly, the LiTEA-coated Li anodes could remarkably extend the cyclability and sustainable capacity of the resultant Li||NMC full cells. Finally, we also demonstrated that the performance of Li||NMC cells could be further improved through combining an LiTEA-coated Li anode with an Li2S-modified NMC811 via atomic layer deposition (ALD). Thus, this study is inspiring for developing high-energy Li||NMC lithium metal batteries.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0023439; AC02-06CH11357
- OSTI ID:
- 2500804
- Alternate ID(s):
- OSTI ID: 2212818
- Journal Information:
- Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 475; ISSN 1385-8947
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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