Nanoscale visualization of redox activity at lithium-ion battery cathodes

Yasufumi Takahashi, Akichika Kumatani, Hirokazu Munakata, Hirotaka Inomata, Komachi Ito, Kosuke Ino, Hitoshi Shiku, Patrick R. Unwin, Yuri E. Korchev, Kiyoshi Kanamura, Tomokazu Matsue

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

Intercalation and deintercalation of lithium ions at electrode surfaces are central to the operation of lithium-ion batteries. Yet, on the most important composite cathode surfaces, this is a rather complex process involving spatially heterogeneous reactions that have proved difficult to resolve with existing techniques. Here we report a scanning electrochemical cell microscope based approach to define a mobile electrochemical cell that is used to quantitatively visualize electrochemical phenomena at the battery cathode material LiFePO 4, with resolution of ∼100 €‰nm. The technique measures electrode topography and different electrochemical properties simultaneously, and the information can be combined with complementary microscopic techniques to reveal new perspectives on structure and activity. These electrodes exhibit highly spatially heterogeneous electrochemistry at the nanoscale, both within secondary particles and at individual primary nanoparticles, which is highly dependent on the local structure and composition.

Original languageEnglish
Article number5450
JournalNature communications
Volume5
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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