Roll-To-Roll Atomic Layer Deposition of Titania Nanocoating on Thermally Stabilizing Lithium Nickel Cobalt Manganese Oxide Cathodes for Lithium Ion Batteries

Chien Te Hsieh*, Chia Hung Chao, Wen Jie Ke, Yeou Fu Lin, Hao Wei Liu, Yasser Ashraf Gandomi, Siyong Gu, Cherng Yuh Su, Jeng Kuei Chang, Jianlin Li, Chun Chieh Fu, Bikash Chandra Mallick, Ruey Shin Juang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Conformal coating of ceramic layers (nm-thick) on Ni-rich layered cathode materials is an effective strategy for improving high-temperature longevity of Li-ion batteries (LIBs). In this work, we develop a roll-to-roll atomic layer deposition (R2R ALD) apparatus for growing uniform nanolayers of TiO2. We explore the effect of ALD parameters (temperature: 120-180 °C and line speed: 2-40 mm s-1) on the TiO2 surface coating and subsequently investigate the electrochemical performance of the as-prepared cathodes. The capacity retention of TiO2-coated porous electrodes is substantially improved compared to that of the pristine cathode material for high-temperature cycling. Electrochemical impedance spectroscopy confirms that the ALD-TiO2 coating suppresses the undesired side reactions initiated at the electrode/electrolyte interface, reduces charge transfer resistance, and ultimately facilitates the Li+ transport through the composite cathode nanostructure. The robust design of the ALD-TiO2 cathode material enables high-temperature operation (>55 °C) with enhanced specific capacity, superior rate capability, excellent cyclability, and ultra-high coulombic efficiency within a wide potential window (3.0-4.35 V). The R2R ALD technique developed in this work paves the way for large-scale fabrication of ceramic-coated cathode sheets with a production rate reaching 2.4 m min-1 for a continuous coating operation.

Original languageEnglish
JournalACS Applied Energy Materials
DOIs
StateAccepted/In press - 2020

Keywords

  • continuous coating
  • high temperature performance
  • lithium ion battery
  • Ni-rich layered cathode
  • roll-to-roll atomic layer deposition
  • titania layer

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