摘要：SummaryCoupling 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 interfaces 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−1/1,024 Wh Lcell−1) coupled with nonflammability.Highlights•Nonflammable, ultra-high-energy-density Li metal full cells are demonstrated.•Thin Li metal anodes are coupled with high-capacity/high-voltage NCM811 cathodes.•4 M LiFSI in PC/FEC shows unique coordination structure of Li+-FSI--solvent cluster.•The coordinated carbonate electrolyte forms both stable SEI and CEI layers.Electrochemical Energy Storage; Electrochemical Materials Science; Electrochemical Energy Engineering
