Cutoff-Voltage-Dependent Low-Voltage Structural Evolution and Apparent Capacity Balancing in Spinel LiFe0.5Mn1.5O4

Abstract

Deep discharging spinel LiFe0.5Mn1.5O4 unlocks additional capacity, but typically triggers rapid structural degradation. Limiting discharge cutoff to 2.5 V mitigates severe structural distortion and interfacial reconstruction induced at 1.9 V, thereby sustaining an apparent capacity-balancing behaviour facilitated by cubic–tetragonal phase coexistence near 2.7 V during cycling.