Improved Li4Ti5O12 electrodes by modified current collector surface

Christina Toigo, Martin Frankenberger, Nicolas Billot, Claudia Pscherer, Benedikt Stumper, Fabian Distelrath, Jonathan Schubert, Karl Heinz Pettinger, Catia Arbizzani

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A copper current collector is treated by electrolytic deposition of copper dendrites at the surface of the foil. This treatment results in a more structured surface leading to an improved contact between the electrode materials and the current collector. The contact to the electrode material particles of different sizes is investigated. Active materials of submicron size exhibit a drastically reduced internal resistance and a clearly improved C-rate capability. BET surface area measurement and calculation of roughness factor resulted in the finding of dendritic copper foil to provide an 8-fold larger surface area compared to the untreated foil. A comprehensive electrochemical impedance spectroscopy study is conducted for elucidation of electrochemical utilisation of the surface area increase. As a result, both fitting parameters for capacitance and surface resistance correspond to a similar normalization shift, indicating a clear improvement in the electro-active interface area.

Original languageEnglish
Article number138978
JournalElectrochimica Acta
Volume392
DOIs
Publication statusPublished - 1 Oct 2021
Externally publishedYes

Keywords

  • Copper dendrites
  • Current collector
  • Electrochemical impedance spectroscopy
  • LTO
  • Lithium titanium oxide
  • Lithium-ion battery
  • Surface modification

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