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Nonflammable Lithium Metal Full Cells with Ultra-high Energy Density Based on Coordinated Carbonate Electrolytes

Published on Jan 16, 2020in iScience
· DOI :10.1016/j.isci.2020.100844
Sung-Ju Cho10
Estimated H-index: 10
(UNIST: Ulsan National Institute of Science and Technology),
Dae-Eun Yu (UNIST: Ulsan National Institute of Science and Technology)+ 4 AuthorsSang-Young Lee38
Estimated H-index: 38
(UNIST: Ulsan National Institute of Science and Technology)
Abstract
Summary Coupling thin Li metal anodes with high-capacity/high-voltage cathodes such as LiNi0.8Co0.1Mn0.1O2 (NCM811) is a promising way to increase lithium battery energy density. Yet, the realization of high-performance full cells remains a formidable challenge. Here, we demonstrate a new class of highly coordinated, nonflammable carbonate electrolytes based on lithium bis(fluorosulfonyl)imide (LiFSI) in propylene carbonate/fluoroethylene carbonate mixtures. Utilizing an optimal salt concentration (4 M LiFSI) of the electrolyte results in a unique coordination structure of Li+-FSI−-solvent cluster, which is critical for enabling the formation of stable interphases on both the thin Li metal anode and high-voltage NCM811 cathode. Under highly demanding cell configuration and operating conditions (Li metal anode=35 μm, areal-capacity/charge-voltage of NCM811 cathode=4.8 mAh cm−2/4.6 V, and anode excess capacity (relative to the cathode) = 0.83), the Li metal-based full cell provides exceptional electrochemical performance (energy densities=679 Wh kgcell−1/1024 Wh Lcell−1) coupled with nonflammability.
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