Electrochemical activation, voltage decay and hysteresis of Li-rich layered cathode probed by various cobalt content

Yingqiang Wu, Leqiong Xie, Xiangming He, Linhai Zhuo, Limin Wang, Jun Ming

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The high capacity of Li-rich layered cathode materials have attracted great attention for the greater energy density lithium ion (Li-ion) batteries, but the understanding of knowledge associated with electrochemical behaviours are still needed to improve their performances further. In this study, different amount of Co content is designed in Li-rich layered compounds (0.5Li2MnO3·0.5LiMn0.5-xNi0.5-xCo2xO2, 0 ≤ x ≤ 0.2), and the stepwise electrochemical activation process is applied to explore the features. We discover that the substitution of Co3+ ions can accelerate the electrochemical activation of Li2MnO3 component, and the Co-doped compound delivers much higher capacities even they suffer an apparent voltage decay comparing to the Co-free one. Besides, a fast metal ions migration exists (e.g., from the metastable tetrahedral site to the lower energy cubic site) in initial dozens of cycles (e.g., 30 cycles at 0.1C); thereafter, they likely return to the original octahedral site, as demonstrated in the voltage decay and hysteresis analysis.
Original languageEnglish (US)
Pages (from-to)115-120
Number of pages6
JournalElectrochimica Acta
Volume265
DOIs
StatePublished - Feb 1 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research was supported by the State Key Laboratory of Rare Earth Resource Utilizations, Changchun Institute of Applied Chemistry, and Shandong Province Science and Technology Program (2014GGX102020). J. Ming is grateful for the support from the King Abdullah University of Science & Technology (KAUST).

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