▎ 摘　　要

Graphene oil as an emerging lubricant usually did not achieve the desired lubricity due to the poor interface compatibility of graphene and base oil, especially at harsh friction conditions. Herein, a simple mechanical grinding method was first carried out to fabricate trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate modified graphene gel ([P-66614][DEHP]-G) for high-performance additive. The as-prepared [P-66614][DEHP]-G gel shows the extraordinary thermostability, dispersity and tribological properties even at high load and temperature conditions. TOF-SIMS and Raman analysis on the friction interface reveal the existence of multi-film structure which presents good synergistic lubricating effect thereby improving the tribological behaviors. This paper provides a good strategy to fabricate high-performance oil-miscible graphene composites for reducing the friction and wear under harsh conditions.