Conformal surface coatings to enable high volume expansion Li-Ion anode materials

Leah A. Riley, Andrew S. Cavanagh, Steven M. George, Yoon Seok Jung, Yanfa Yan, Se Hee Lee, Anne C. Dillon

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

An alumina surface coating is demonstrated to improve electrochemical performance of MoO3 nanoparticles as high capacity/ high-volume expansion anodes for Li-ion batteries. Thin, conformal surface coatings were grown using atomic layer deposition (ALD) that relies on self-limiting surface reactions. ALD coatings were tested on both individual nanoparticles and prefabricated electrodes containing conductive additive and binder. The coated and non-coated materials were characterized using transmission electron microscopy, energy-dispersive X-ray spectroscopy, electrochemical impedance spectroscopy, and galvanostatic charge/discharge cycling. Importantly, increased stability and capacity retention was only observed when the fully fabricated electrode was coated. The alumina layer both improves the adhesion of the entire electrode, during volume expansion/contraction and protects the nanoparticle surfaces. Coating the entire electrode also allows for an important carbothermal reduction process that occurs during electrode pre-heat treatment. ALD is thus demonstrated as a novel and necessary method that may be employed to coat the tortuous network of a battery electrode.

Original languageEnglish
Pages (from-to)2124-2130
Number of pages7
JournalChemPhysChem
Volume11
Issue number10
DOIs
Publication statusPublished - 2010 Jul 12

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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