Abstract
Markedly enhanced rate performance of Li-rich (Li1.2Ni0.4/3Co0.4/3Mn1.6/3O2) cathode material is observed after a simple electrochemical pretreatment. The cathode material can deliver discharge capacities of 196, 124 and 86 mAh g−1, under current densities of 2, 20 and 40 C, respectively. The capacity retention reaches 60% after 1000 cycles even at 20 C. Analysis of dQ/dV plot and impedance spectroscopy prove that more migration of Ni3+ to Li+ vacancies as well as the higher charge-transfer resistance by a partially insulating Li2O layer, which are created when a slower first charge/discharge rate is applied, result in the capacity loss upon prolonged cycling. © 2013 The Electrochemical Society. [DOI: 10.1149/2.006308eel] All rights reserved.
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