Relationship between Electrochemical Pre-Treatment and Cycle Performance of a Li-Rich Solid-Solution Layered Li_1−α[Ni_0.18Li_0.20+αCo_0.03Mn_0.58]O₂ Cathode for Li-Ion Secondary Batteries

抄録

In our previous paper (J. Power Sources, 183, 344 (2008)), we proposed the application of a pre-cycling treatment to a Li-rich solid-solution layered cathode (xLi₂MnO₃·yLi[Ni_0.5Mn_0.5]O₂·zLi[Co_1/3Ni_1/3Mn_1/3]O₂ where (x + y + z = 1)) before the charge/discharge cycling process to obtain enhanced capacities stable above 250 mAh g⁻¹. The aim of the present work is to reduce the duration of this pre-cycling process. The cycling performance dependence of Li_1−α[Ni_0.18Li_0.20+αCo_0.03Mn_0.58]O₂ on the pre-cycling processing parameters, such as the number of cycles, voltage limits, and current density was explored. The processing conditions were then optimized, which ultimately reduced the pre-cycling treatment time from one week to 6.5 h.