As a proof of concept, we prepare a baseline cell composed of a standard electrolyte, 1 M LiPF6 in ethylene carbonate (EC)/ethyl methyl carbonate (EMC) (3/7 wt) + 2 weight % (wt %) vinylene carbonate (VC), and a graphite anode and an NCM622 cathode. Protective layers of solid electrolyte interphase (SEI) on graphite and cathode electrolyte interphase (CEI) are formed during initial charge/discharge cycles. To yield low DCR and hence high power, these interfacial layers are usually thin, lacking sufficient density and resilience to resist decomposition under abuse conditions, to suppress continuous reaction of the solvent EC in the SEI, or to hinder continuous oxidation of EC with oxygen released from cathode materials in the CEI, thereby leading to Li consumption and loss of cell capacity. In contrast, in SEB cells, we create highly stable, flame-retardant EEIs through the addition of a small amount of TAP in the standard electrolyte. This electrolyte modification is accompanied by the simultaneous reduction of EC content, i.e., EC/EMC (1/9 wt) + 2 wt % VC, intended for further reduction in gas production via side reactions. In this work, we present results for three prototype SEB cells, identified as SEB-1, SEB-2, and SEB-3 and corresponding to 0.5, 1, and 1.5 wt % TAP, respectively. The charge-transfer resistance of the SEB cells, measured by electrochemical impedance spectroscopy (EIS), increases by 3× to 5× as compared to the baseline cell without the electrolyte additives, as shown in Fig. 2A. The high impedance comes from the polymerization of TAP molecules that form thick and dense interfacial films at the surfaces of both the anode and cathode (2). On the anode side, the film serves as an enhanced SEI layer to stabilize further growth. On the cathode side, the film hinders EC in the electrolyte from reacting with lattice oxygen on the NCM surface at high temperature or high voltage (3), as shown schematically in Fig. 2B.