Relationship between Electrochemical pre-treatment and cycle performance of a li-rich solid-solution layered Li1-a[Ni0.18Li 0.20+aCO0.03Mn0.58]O2 Cathode for Li-Ion Secondary Batteries

Abstract

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[Ni0.5Mn 0.5O2.zLi[CO1/3Ni1/3Mni/3]0 2 where (x + y + z = 1)) before the charge/discharge cycling process to obtain enhanced capacities stable above 250mAhg-1. The aim of the present work is to reduce the duration of this pre-cycling process. The cycling performance dependence of Li1-a[Ni0.18Li 0.20+aCO0.03Mno.58]02 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. © The Electrochemical Society of Japan All rights reserved.