A polymerized C60 coating enhancing interfacial stability at three-dimensional LiCoO2 in high-potential regime

Chairul Hudaya, Martin Halim, Johannes Pröll, Heino Besser, Wonchang Choi, Wilhelm Pfleging, Hans Jürgen Seifert, Joong Kee Lee

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The interfacial instabilities, including side reactions due to electrolyte decompositions and Cobalt (Co) dissolutions, are the main detrimental processes at LiCoO2 cathode when a high-voltage window (>4.2 V) is applied. Nevertheless, cycling the cathode with a voltage above 4.2 V would deliver an increased gravimetric capacity, which is desired for high power battery operation. To address these drawbacks, we demonstrate a synergistic approach by manufacturing the three-dimensional high-temperature LiCoO2 electrodes (3D HT-LCO) using laser-microstructuring, laser-annealing and subsequent coating with polymerized C60 thin films (C60@3D HT-LCO) by plasma-assisted thermal evaporation. The C60@3D HT-LCO cathode delivers higher initial discharge capacity compared to its theoretical value, i.e. 175 mA h g-1 at 0.1 C with cut-off voltage of 3.0-4.5 V. This cathode combines the advantages of the 3D electrode architecture and an advanced C60 coating/passivation concept leading to an improved electrochemical performance, due to an increased active surface area, a decreased charge transfer resistance, a prevented Co dissolution into the electrolyte and a suppressed side reaction and electrolyte decomposition. This work provides a novel solution for other cathode materials having similar concerns in high potential regimes for application in lithium-ion microbatteries.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Power Sources
Volume298
DOIs
Publication statusPublished - 24 Aug 2015

Keywords

  • Co dissolutions
  • High-voltage window
  • Interfacial kinetics
  • Laser structuring/annealing
  • Polymerized C<inf>60</inf> coating films
  • Three-dimensional LiCoO<inf>2</inf>

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