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Cutoff-voltage-dependent low-voltage structural evolution and apparent capacity balancing in spinel LiFe0.5Mn1.5O4
Zuojun Yang1, Shun Zheng1, Guokang Chen1
1School of Chemistry and Chemical Engineering, In-situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED), Shanghai Jiao Tong University, Shanghai 200240, P.R. China. yxzhang2019@sjtu.edu.cn.
None:
Deep discharging spinel LiFe0.5Mn1.5O4 unlocks additional capacity, but typically triggers rapid structural degradation. Limiting the discharge cutoff to 2.5 V mitigates the 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.
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