Al-Doped Co-Free Layered-Spinel Mn/Ni Oxides as High-Capacity Cathode Materials for Advanced Li-Ion Batteries

Prasant Kumar Nayak, Dhatshanamoorthy Boopathi, Elena Levi, Judith Grinblat, Yuval Elias, Boris Markovsky, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Li- and Mn-rich layered-spinel integrated cathodes exhibit a high specific capacity, ≥200 mAh g-1, in a wide potential range; however, the low initial capacity of Li[Ni1/3Mn2/3]O2is a drawback for their application in Li-ion batteries. Two Al-doped layered-spinel Li[Ni0.33Mn0.63Al0.03]O2and Li[Ni0.33Mn0.60Al0.06]O2cathode materials which were synthesized by self-combustion reaction, having less monoclinic and more active spinel phases, could show a much higher initial capacity compared to the undoped reference material. These cathode materials exhibit an initial specific capacity of 188 mAh g-1vs ∼110 mAh g-1when cycled at 20 mA g-1between 2.3 and 4.9 V vs Li. Their capacity gradually increases to 210 mAh g-1during initial cycling in standard electrolyte solutions and stabilizes thereafter. The average discharge voltage decreases from around 3.6 to 3.2 V after 200 cycles. Electrochemical impedance spectroscopic measurements clearly indicate the lower impedance due to lower surface film and charge-transfer resistance of the cathodes comprising the Al-doped materials compared to cathodes comprising the reference, undoped material. The high specific capacity and excellent cycling stability of Li[Ni0.33Mn0.60Al0.06]O2render it a promising cathode material for high-energy Li-ion batteries.

Original languageEnglish
Pages (from-to)4279-4287
Number of pages9
JournalACS Applied Energy Materials
Volume5
Issue number4
DOIs
StatePublished - 25 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Keywords

  • Al doping
  • Li-ion batteries
  • electrochemical impedance spectroscopy
  • high-capacity cathodes
  • layered-spinel structure
  • lithiated transition metal oxide

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