Fluorine-incorporated interface enhances cycling stability of lithium metal batteries with Ni-rich NCM cathodes

Investigation of fluorinated ether‐containing electrolytes for high energy‐density nickel‐rich LiNi 0 . 8 Co 0 . 1 Mn 0 . 1Xia1, Miao2, Wang3 et al. 2021Int J Energy Res5010View full textAdd to dashboardCite

“…The better electrochemical properties of the FEC‐EMC‐TTE electrolyte solution than those of FEC‐EMC‐HFPM have two reasons. One is that TTE solvent can suppress the decomposition of FEC and stabilize the FEC‐EMC electrolyte solution, the other is that the solvent TTE is prone to be reduced rapidly enough to form a stable interface layer covering in the highly reactive Li surface, which is reported in the literature 32 …”

“…Further attempts to avoid ongoing electrolyte decomposition for NCM811 have been made by preparing advanced electrolytes with good oxidative stability 29‐31 . Novel anti‐oxidant solvents, such as room temperature ionic liquids (ILs), 29 organic phosphorus compounds 30 and fluorinated solvents, 31,32 as a co‐solvent in the electrolytes, can enable electrolytes with both good compatibility with NCM811 electrodes and nonflammable property; however, these electrolytes containing IL or phosphate compound have low conductivity and poor wettability to electrodes, which lead to high over‐potential and low initial CE of the Li/NCM811 cells 29,30 . It is recognized that the fluorinated solvents‐containing electrolytes appear to be a suitable candidate for nickel‐rich NCM811 positive electrodes.…”

The Influence of Micro-Structured Anode Current Collectors in Combination with Highly Concentrated Electrolyte on the Coulombic Efficiency of In-Situ Deposited Li-Metal Electrodes with Different Counter Electrodes

“…In case of experiments with ether-based electrolyte and NCM electrodes current collector corrosion [32] has to be considered. Despite this fact, cycle performance of Li electrodes against NCM is strongly improved by replacing carbonate-with ether-based electrolytes due to their ability to suppress dendritic Li growth [33].…”

Lithium reduction reaction for interfacial regulation of lithium metal anode

“…Based on this electrolyte, an Li||NMC811 full cell exhibited an excellent CE of 99.98% after 100 cycles. 85 In addition, tris(2,2,2-trifluoroethyl)orthoformate (TFEO)-based electrolyte could also promote long-term cycling stability with minimal pulverization of the LMA (Fig. 4b).…”