3D microstructure design of lithium-ion battery electrodes assisted by X-ray nano-computed tomography and modelling

Research output: Contribution to journalArticle

Authors

  • Xuekun Lu
  • Antonio Bertei
  • Donal P Finegan
  • Chun Tan
  • Sohrab R Daemi
  • Julia S Weaving
  • Kieran B O'Regan
  • Thomas M M Heenan
  • Gareth Hinds
  • Dan J L Brett
  • Paul R Shearing

Colleges, School and Institutes

External organisations

  • THE FARADAY INSTITUTION
  • Rheumatology Unit, University of Pisa, Pisa, Italy.
  • National Renewable Energy Laboratory
  • NIHR University College London Hospitals Biomedical Research Centre, UCL Cancer Institute, University College London, London WC1E 6DD, UK.
  • National Physical Laboratory

Abstract

Driving range and fast charge capability of electric vehicles are heavily dependent on the 3D microstructure of lithium-ion batteries (LiBs) and substantial fundamental research is required to optimise electrode design for specific operating conditions. Here we have developed a full microstructure-resolved 3D model using a novel X-ray nano-computed tomography (CT) dual-scan superimposition technique that captures features of the carbon-binder domain. This elucidates how LiB performance is markedly affected by microstructural heterogeneities, particularly under high rate conditions. The elongated shape and wide size distribution of the active particles not only affect the lithium-ion transport but also lead to a heterogeneous current distribution and non-uniform lithiation between particles and along the through-thickness direction. Building on these insights, we propose and compare potential graded-microstructure designs for next-generation battery electrodes. To guide manufacturing of electrode architectures, in-situ X-ray CT is shown to reliably reveal the porosity and tortuosity changes with incremental calendering steps.

Details

Original languageEnglish
Article number2079
Number of pages13
JournalNature Communications
Volume11
Issue number1
Publication statusPublished - 29 Apr 2020