Abstract：The performances of LiNi0.6Co0.2Mn0.2O2 cathode material at different charging cut-off voltage (4.3 V, 4.5 V, 4.7 V, 4.9 V and 5.1 V) were analyzed to study the effect of overcharge. The results showed that the discharging specific capacity of the material decreased obviously after charging to 4.9 V. The phase transition during the charging-discharging process was analyzed by dQ/dV. The decrease of discharging specific capacity was due to the emergence of H3 phase. The XRD results showed that the whole structure of the material did not change, but had a phase transition. As can be seen from the plane and cross section SEM photos, the breakage of the material was obvious and cracks generated at inner of the material after overcharge. Moreover, the thermal stability of the material also decreased after overcharge.
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2021, Vol. 28 