Jump to main content
Jump to site search

Issue 4, 2018
Previous Article Next Article

Single-particle measurements of electrochemical kinetics in NMC and NCA cathodes for Li-ion batteries

Author affiliations

Abstract

The electrochemical kinetics of battery electrodes at the single-particle scale are measured as a function of state-of-charge, and interpreted with the aid of concurrent transmission X-ray microscopy (TXM) of the evolving particle microstructure. An electrochemical cell operating with near-picoampere current resolution is used to characterize single secondary particles of two widely-used cathode compounds, NMC333 and NCA. Interfacial charge transfer kinetics are found to vary by two orders of magnitude with state-of-charge (SOC) in both materials, but the origin of the SOC dependence differs greatly. NCA behavior is dominated by electrochemically-induced microfracture, although thin binder coatings significantly ameliorate mechanical degradation, while NMC333 demonstrates strongly increasing interfacial reaction rates with SOC for chemical reasons. Micro-PITT is used to separate interfacial and bulk transport rates, and show that for commercially relevant particle sizes, interfacial transport is rate-limiting at low SOC, while mixed-control dominates at higher SOC. These results provide mechanistic insight into the mesoscale kinetics of ion intercalation compounds, which can guide the development of high performance rechargeable batteries.

Graphical abstract: Single-particle measurements of electrochemical kinetics in NMC and NCA cathodes for Li-ion batteries

Back to tab navigation

Supplementary files

Publication details

The article was received on 01 Jan 2018, accepted on 27 Feb 2018 and first published on 15 Mar 2018


Article type: Paper
DOI: 10.1039/C8EE00001H
Citation: Energy Environ. Sci., 2018,11, 860-871
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    Single-particle measurements of electrochemical kinetics in NMC and NCA cathodes for Li-ion batteries

    P. Tsai, B. Wen, M. Wolfman, M. Choe, M. S. Pan, L. Su, K. Thornton, J. Cabana and Y. Chiang, Energy Environ. Sci., 2018, 11, 860
    DOI: 10.1039/C8EE00001H

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements