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 and Tomokazu Matsue
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Yasufumi Takahashi: WPI-Advanced Institute for Materials Research, Tohoku University
Akichika Kumatani: WPI-Advanced Institute for Materials Research, Tohoku University
Hirokazu Munakata: Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
Hirotaka Inomata: Graduate School of Environmental Studies, Tohoku University
Komachi Ito: Graduate School of Environmental Studies, Tohoku University
Kosuke Ino: Graduate School of Environmental Studies, Tohoku University
Hitoshi Shiku: Graduate School of Environmental Studies, Tohoku University
Patrick R. Unwin: University of Warwick
Yuri E. Korchev: Imperial College London
Kiyoshi Kanamura: Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
Tomokazu Matsue: WPI-Advanced Institute for Materials Research, Tohoku University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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 LiFePO4, 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.

Date: 2014
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DOI: 10.1038/ncomms6450

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