Surface structure and high-voltage charging/discharging performance of low-content Zr-oxide-coated LiNi1/3Co1/3Mn1/3O2

Akira Yano, Atsushi Ueda, Masahiro Shikano, Hikari Sakaebe, Zempachi Ogumi

Research output: Contribution to journalArticlepeer-review

Abstract

The surface structures, high-voltage charging/discharging performances, and Li-ion transfer at the electrode/electrolyte interface of LiNi1/3Co1/3Mn1/3O2 coated with small amounts of Zr oxide by the sol-gel method were investigated. Island-like ZrO2 grains as well as grain-free (sea-like) zones were observed on the surfaces of the coated LiNi1/3Co1/3Mn1/3O2 samples. The ratio of the area of these sea-like zones to the total surface area of the LiNi1/3Co1/3Mn1/3O2 sample increased from 44 to 85% when the Zr oxide content was decreased from 1.0 to 0.125 wt%. A compound oxide phase containing Zr, Ni, Co, and Mn was formed uniformly on the sea-like zones; the depth of this phase was approximately 2 nm. The initial discharge capacities of the coated LiNi1/3Co1/3Mn1/3O2 samples were equal to that of bare LiNi1/3 Co1/3Mn1/3O2. Further, the cycling performances of the coated LiNi1/3Co1/3Mn1/3O2 samples were significantly higher, as were their discharge capacities and discharge voltages, while their charge-transfer resistances (Rct) were lower. It was also found that the coated LiNi1/3Co1/3Mn1/3O2 samples had lower activation energies (Ea) for charge transfer than the bare LiNi1/3 Co1/3Mn1/3O2. Thus, it can be surmised that the area and structure of the sea-like zones determined the Rct and Ea values and cycling performances of the coated LiNi1/3Co1/3Mn1/3O2 samples.

Original languageEnglish
Pages (from-to)A75-A82
JournalJournal of the Electrochemical Society
Volume163
Issue number2
DOIs
Publication statusPublished - 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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