Recently, molybdenum disulfide (MoS 2 ) has been extensively investigated as a promising pseudocapacitor electrode material. However, MoS 2 usually exhibits inferior rate capability and cyclability, which restrain its practical application in energy storage. In this work, MoS 2 nanoflowers regulated by Li 2 SO 4 (L-MoS 2 ) are successfully fabricated via intercalating solvated Li ions. Via appropriate intercalation of Li 2 SO 4 , MoS 2 nanosheets could self-assemble to form L-MoS 2 nanoflowers with an interlayer spacing of 0.65 nm. Due to the large specific surface area (23.7 m 2 g -1 ) and high 1T phase content (77.5%), L-MoS 2 as supercapacitor electrode delivers a maximum specific capacitance of 356.7 F g -1 at 1 A g -1 and maintains 49.8% of capacitance retention at 20 A g -1 . Moreover, the assembled L-MoS 2 symmetric supercapacitor (SSC) device displays an energy density of 6.5 W h kg -1 and 79.6% of capacitance retention after 3000 cycles.