Dual-anion ionic liquid electrolyte enables stable Ni-rich cathodes in lithium-metal batteries

Abstract

Exploiting the high-energy density of lithium metal as a negative electrode for lithium batteries is considered a prerequisite to satisfy the continually increasing demand for extended driving range of electric vehicles and fully electrify our mobility and transportation. However, such lithium-metal batteries face critical safety and life-span concerns. This work outlines a clear route toward realizing safe high-energy-density lithium-metal batteries with excellent cycling stability through the use of a non-flammable and low-volatile ionic liquid electrolyte.

Stabilizing the Li1.3Al0.3Ti1.7(PO4)3|Li Interface for High Efficiency and Long Lifespan Quasi‐Solid‐State Lithium Metal Batteries

“…The better stability towards reduction is also in a good agreement with literature. [22,25] The better ChemSusChem oxidation and reduction stability of H-MILE implies that combining Pyr 14 FSI, Pyr 14 TFSI and LiFSI into a ternary ionic liquid electrolyte may lead to better electrode j electrolyte interfacial compatibility and a wider operating voltage range.…”

“…A recent work done by Wu et al. revealed a synergistic interplay of FSI and TFSI dual anions which enables highly favorable interfacial passivation layers on the surface of both Li metal and Ni‐rich NCM electrodes, contributing to an outstanding capacity retention of 88 % over 1000 cycles [22] …”

“…[21] A recent work done by Wu et al revealed a synergistic interplay of FSI and TFSI dual anions which enables highly favorable interfacial passivation layers on the surface of both Li metal and Ni-rich NCM electrodes, contributing to an outstanding capacity retention of 88 % over 1000 cycles. [22] Thus, we hereby compare the performance of hybrid electrolytes employing different ILEs, in particular, the single anion 0.3LiFSI-0.7Pyr 14 FSI (ILE) and the mixed anion 0.3LiFSI-0.35Pyr 14 FSI-0.35Pyr 14 TFSI (MILE). The resulting hybrid electrolytes are denoted as H-ILE and H-MILE, accordingly.…”

Monofluoro-ether electrolyte design with reduced Li+-anion coordination enables fast-charging ultrahigh-voltage lithium metal batteries

“…3h-k). 22,37,38 A thinner and more uniform CEI of only 3 nm was observed in FDEE-LHCE by transmission electron microscopy (TEM), compared to the other electrolytes (Figure 3l). Given the fact that all the three LHCEs contain similar ratios of identical fluorinated species (LiFSI and TTE), it is very surprising to find the significant enrichment of LiF species with the FDEE-based electrolyte, where the CIP structure with low FSIcoordination in the inner solvation sheath is in dominance.…”

Hydrogen bonding enhanced SiO2/PEO composite electrolytes for solid-state lithium batteries

“…8 The energy density of a battery is closely related to the capacity density of the positive and negative electrodes. 9–11 First, the electrochemical window of SSEs is large, which can match the high voltage positive electrode. 12,13 At the same time, SSEs can also match the negative electrode of lithium metal.…”