LAUSR

Abstract High-voltage LiNi 0.5 Mn 1.5 O 4 has been considered as one of the most promising cathode candidate for LIBs due to its excellent energy density and power density, but the attack of HF on the material and dissolution of Mn ions into electrolyte can cause structure collapse and serious capacity fading of the cathode. In this work, a semiconductor of LaFeO 3 was coated on the surface of polyhedral LiNi 0.5 Mn 1.5 O 4 via a wet-chemical method. LaFeO 3 coated at the surface of LiNi 0.5 Mn 1.5 O 4 significantly protects the cathode from the corrosion of HF and alleviates the dissolution of Mn ions into organic liquid electrolyte during (dis)charge processes. The 2.0 wt% LaFeO 3 -coated LiNi 0.5 Mn 1.5 O 4 cathode exhibits much better cycling stability, rate capability, and elevated temperature stability than the pristine: capacity retention of 97.71% at 1 C after 100 cycles vs. that of 90.96%; rate capability of 111.9 and 99.6 mAh g −1 at high C-rates of 5 C and 10 C vs. that of 90.6 and 76.4 mAh g −1 , respectively; and high temperature capacity retention of 93.29% at 1 C after 100 cycles vs. that of 69.9%. Present study provides a facile method to mitigate the dissolution of Mn ions into electrolyte for LiNi 0.5 Mn 1.5 O 4 , resulting in excellent cycling performance and rate capability.