Tuesday, November 17, 2020

Roll-To-Roll ALD to Thermally Stabilizing NCM Cathodes for Lithium Ion Batteries

Universities in USA, China and Taiwan have developed a roll-to-roll atomic layer deposition (R2R ALD) apparatus for growing uniform thin layers of TiO2 that can be used to passivate NCM lithium battery cathode material. At a roll line speed: 2–40 mm s–1 the deposition of the TiO2was investigated. 
  • 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 NCM cathode material enables high-temperature operation (>55 °C) with enhanced specific capacity, superior rate capability, excellent cyclability, and 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.
The schematic diagram of R2R ALD system, consisted of four main parts: gas delivering unit, sample delivering unit, plasma reactor unit, and ALD shower array unit. Figure from supporting info: https://doi.org/10.1021/acsaem.0c01541


Reference:
Roll-To-Roll Atomic Layer Deposition of Titania Nanocoating on Thermally Stabilizing Lithium Nickel Cobalt Manganese Oxide Cathodes for Lithium Ion Batteries
ACS Appl. Energy Mater. 2020, XXXX, XXX, XXX-XXX
Publication Date:November 11, 2020


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