Atomic Layer Deposition of Al2O3-Ga2O3 Alloy Coatings for Li[Ni0.5Mn0.3Co0.2]O2 Cathode to Improve Rate Performance in Li-Ion Battery

Masihhur R. Laskar, David H K Jackson, Yingxin Guan, Shenzhen Xu, Shuyu Fang, Mark Dreibelbis, Mahesh K. Mahanthappa, Dane Morgan, Robert J. Hamers, Thomas F. Kuech

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34 Scopus citations

Abstract

Metal oxide coatings can improve the electrochemical stability of cathodes and hence, their cycle-life in rechargeable batteries. However, such coatings often impose an additional electrical and ionic transport resistance to cathode surfaces leading to poor charge-discharge capacity at high C-rates. Here, a mixed oxide (Al2O3)1-x(Ga2O3)x alloy coating, prepared via atomic layer deposition (ALD), on Li[Ni0.5Mn0.3Co0.2]O2 (NMC) cathodes is developed that has increased electron conductivity and demonstrated an improved rate performance in comparison to uncoated NMC. A "co-pulsing" ALD technique was used which allows intimate and controlled ternary mixing of deposited film to obtain nanometer-thick mixed oxide coatings. Co-pulsing allows for independent control over film composition and thickness in contrast to separate sequential pulsing of the metal sources. (Al2O3)1-x(Ga2O3)x alloy coatings were demonstrated to improve the cycle life of the battery. Cycle tests show that increasing Al-content in alloy coatings increases capacity retention; whereas a mixture of compositions near (Al2O3)0.5(Ga2O3)0.5 was found to produce the optimal rate performance.

Original languageEnglish (US)
Pages (from-to)10572-10580
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number16
DOIs
StatePublished - Apr 27 2016

Keywords

  • AlO
  • GaO
  • Li-ion battery
  • NMC cathode
  • atomic layer deposition
  • coatings

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