Influence of annealing atmosphere on Li 2 ZrO 3 -coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 and its high-voltage cycling performance

Xiaowen Zhan, Shuang Gao, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Layered Ni-rich oxides have attracted much attention for the positive electrode in lithium-ion batteries due to their low cost and high capacity. However, they still suffer from poor cycling and rate performance, especially at high voltage. In this work, LiNi 0.6 Co 0.2 Mn 0.2 O 2 powders are surface-modified by a Li 2 ZrO 3 coating prepared under either dry air or oxygen. The effect of the coating atmosphere on the electrochemical properties of Li 2 ZrO 3 /LiNi 0.6 Co 0.2 Mn 0.2 O 2 are systematically investigated by multiple structural characterization (synchrotron HRXRD, SEM, TEM, and XPS) and electroanalytical (EIS, SSCV, and GITT) techniques. The Li 2 ZrO 3 coating prepared in oxygen is largely amorphous. It not only provides surface protection against the electrolyte corrosion but also enables faster lithium-ion transport at the interfacial regions. Additionally, oxygen atmosphere facilitates Zr diffusion from the surface coating to the bulk of LiNi 0.6 Co 0.2 Mn 0.2 O 2 , which stabilizes the crystal structure and enhances lithium-ion diffusion. Consequently, LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathodes coated with Li 2 ZrO 3 in oxygen exhibit improved high-voltage cycling stability and high-rate performance.

Original languageEnglish
Pages (from-to)36-44
Number of pages9
JournalElectrochimica Acta
Volume300
DOIs
StatePublished - Mar 20 2019

Bibliographical note

Funding Information:
Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences , under Contract No. DE-AC02-06CH11357 . The authors would like to acknowledge the support from US National Science Foundation Award 1355438 (Powering the Kentucky Bioeconomy for a Sustainable Future). Xiaowen Zhan would like to thank Dr. Mona Shirpour for helpful discussions, and the Department of Chemical and Materials Engineering at the University of Kentucky for its partial financial support of this work.

Funding Information:
Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The authors would like to acknowledge the support from US National Science Foundation Award 1355438 (Powering the Kentucky Bioeconomy for a Sustainable Future). Xiaowen Zhan would like to thank Dr. Mona Shirpour for helpful discussions, and the Department of Chemical and Materials Engineering at the University of Kentucky for its partial financial support of this work.

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

  • High voltage
  • LiNi Co Mn O
  • Lithium-ion battery
  • Oxygen atmosphere
  • Surface coating

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Electrochemistry

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