Exploring Lithium-Cobalt-Nickel Oxide Spinel Electrodes for ≥3.5 v Li-Ion Cells

Eungje Lee*, Joel Blauwkamp, Fernando C. Castro, Jinsong Wu, Vinayak P. Dravid, Pengfei Yan, Chongmin Wang, Soo Kim, Christopher Wolverton, Roy Benedek, Fulya Dogan, Joong Sun Park, Jason R. Croy, Michael M. Thackeray

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Recent reports have indicated that a manganese oxide spinel component, when embedded in a relatively small concentration in layered xLi2MnO3·(1-x)LiMO2 (M = Ni, Mn, or Co) electrode systems, can act as a stabilizer that increases their capacity, rate capability, cycle life, and first-cycle efficiency. These findings prompted us to explore the possibility of exploiting lithiated cobalt oxide spinel stabilizers by taking advantage of (1) the low mobility of cobalt ions relative to that of manganese and nickel ions in close-packed oxides and (2) their higher potential (∼3.6 V vs Li0) relative to manganese oxide spinels (∼2.9 V vs Li0) for the spinel-to-lithiated spinel electrochemical reaction. In particular, we revisited the structural and electrochemical properties of lithiated spinels in the LiCo1-xNixO2 (0 ≤ x ≤ 0.2) system, first reported almost 25 years ago, by means of high-resolution (synchrotron) X-ray diffraction, transmission electron microscopy, nuclear magnetic resonance spectroscopy, electrochemical cell tests, and theoretical calculations. The results provide a deeper understanding of the complexity of intergrown layered/lithiated spinel LiCo1-xNixO2 structures when prepared in air between 400 and 800 °C and the impact of structural variations on their electrochemical behavior. These structures, when used in low concentrations, offer the possibility of improving the cycling stability, energy, and power of high energy (≥3.5 V) lithium-ion cells.

Original languageEnglish (US)
Pages (from-to)27720-27729
Number of pages10
JournalACS Applied Materials and Interfaces
Volume8
Issue number41
DOIs
StatePublished - Oct 19 2016

Keywords

  • lithium-cobalt-nickel oxide
  • lithium-ion battery
  • spinel
  • stabilizer
  • structure

ASJC Scopus subject areas

  • Materials Science(all)

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