The highly important merit of high-voltage tolerance brought by adding NO3 -in the dilute ether electrolytes can be best signified when testing LMBs with high-loading cathodes. Figure exhibits extremely stable cycling performances of Li||cathodes cells consisting of a medium-high cathode areal loading of 1.3-1.4 mAh cm -2 and NO3 --containing dilute ether electrolytes. The Li||LiCoO2 cell in the ether electrolyte with 200 mM LiNO3 showed high capacity retention (95.5%) (Figure ) and a small polarization (Figure ) after 300 cycles. Meanwhile, only a trace amount of electrolyte under this condition has been decomposed (maximum mass fraction per cycle < 0.022 wt%, see Note S3 for details). Notably, although this oxidative breakdown did not gradually weaken or halt (Figure ), it did not result in continuous undesired cathode capacity fading. Furthermore, this ether electrolyte successfully enabled stable cycling of Li||NMC532 under 4.3 V for 300 cycles (Figures 4B). To the best of our knowledge, this is the first demonstration that long-term stability of LMB with DME-based ether electrolyte at such low concentration can be obtained under a cutoff voltage of 4.3 V. Admittedly, the reported test conditions still fall short of the stringent requirements of practical LMBs (lean electrolyte, thin Li, and > 3 mAh cm -2 cathode loading). . Nevertheless, the effectiveness of our proposed anion-adsorption strategy for increasing the high-voltage tolerance of dilute ether electrolytes is clear from the electrochemical measurements. Further improvements can be gained when NO3 -containing ether electrolytes are used in combination with other strategies for Li metal stabilization, such as nanostructuring the electrode and coordinating different salts .