Relationship between Electrochemical Pre-Treatment and Cycle Performance of a Li-Rich Solid-Solution Layered Li1-α[Ni0.18Li0.20+αCo0.03Mn0.58]O2 Cathode for Li-Ion Secondary Batteries

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 (xLi(2)MnO(3)center dot yLi[Ni0.5Mn0.5]O-2 center dot zLi[Co1/3Ni1/3Mn1/3]O-2 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 Li1-alpha[Ni0.18Li0.20+alpha Co0.03Mn0.58]O-2 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. (C) The Electrochemical Society of Japan, All rights reserved.