Concurrently Approaching Volumetric and Specific Capacity Limits of Lithium Battery Cathodes via Conformal Pickering Emulsion Graphene Coatings

Kyu Young Park, Jin Myoung Lim, Norman S. Luu, Julia R. Downing, Shay G. Wallace, Lindsay E. Chaney, Hocheon Yoo, Woo Jin Hyun, Hyeong U. Kim, Mark C. Hersam

Research output: Contribution to journalArticlepeer-review

Abstract

To achieve the high energy densities demanded by emerging technologies, lithium battery electrodes need to approach the volumetric and specific capacity limits of their electrochemically active constituents, which requires minimization of the inactive components of the electrode. However, a reduction in the percentage of inactive conductive additives limits charge transport within the battery electrode, which results in compromised electrochemical performance. Here, an electrode design that achieves efficient electron and lithium-ion transport kinetics at exceptionally low conductive additive levels and industrially relevant active material areal loadings is introduced. Using a scalable Pickering emulsion approach, Ni-rich LiNi0.8Co0.15Al0.05O2 (NCA) cathode powders are conformally coated using only 0.5 wt% of solution-processed graphene, resulting in an electrical conductivity that is comparable to 5 wt% carbon black. Moreover, the conformal graphene coating mitigates degradation at the cathode surface, thus providing improved electrochemical cycle life. The morphology of the electrodes also facilitates rapid lithium-ion transport kinetics, which provides superlative rate capability. Overall, this electrode design concurrently approaches theoretical volumetric and specific capacity limits without tradeoffs in cycle life, rate capability, or active material areal loading.

Original languageEnglish
Article number2001216
JournalAdvanced Energy Materials
Volume10
Issue number25
DOIs
Publication statusPublished - Jul 1 2020

Keywords

  • Ni-rich cathodes
  • Pickering emulsions
  • graphene
  • high capacity
  • lithium-ion batteries

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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