Li/Mn-rich layered oxide (LMR) cathode active materials offer remarkably high specific discharge capacity (>250 mAh g-1) stemming from both cationic and anionic redox. The latter necessitates harsh charging conditions to high cathode potentials (>4.5 V vs. Li|Li+), which is accompanied by lattice oxygen release, phase transformation, voltage fade, and transition metal (TM) dissolution. In cells with graphite anode, TM dissolution is particularly detrimental as it initiates electrode crosstalk. Lithium difluorophosphate (LiDFP) is known for its pivotal role in suppressing electrode crosstalk through TM scavenging. In LMR || graphite cells charged to an upper cut-off voltage (UCV) of 4.5 V, effective TM scavenging effects of LiDFP is observed. In contrast, in cells with an UCV of 4.7 V, the scavenging effects is limited due to more severe TM dissolution compared an UCV of 4.5 V. Worth noting, the low solubility limit of the TM scavenging agents, e.g., PO43- and PO3F2-, which are the decomposition products of LiDFP, cannot scavenge additional TMs, even when higher LiDFP concentration are added to the electrolyte and can even worsen the performance.