Fast-Charging Li4Ti5O12 Anode Driven by Light

Yuanyuan Ma, Yaxin Shen, Heonjae Jeong, Jason Lipton, Hang Wang, Stephen A. Maclean, Jason A. Rӧhr, Christopher S. Johnson, André D. Taylor

Research output: Contribution to journalArticlepeer-review

Abstract

Lithium-ion batteries with fast charging capabilities are crucial for widespread adoption of electric vehicles, as they will increase acceptance of the technology and reduce range anxiety for drivers. To achieve this, advanced fast charging technologies and alternative methods to enhance the slow electrochemical processes are desperately required. This study applied light-emitting diode (LED) photo-assisted fast charging to Li4Ti5O12 (LTO), a large bandgap cubic spinel material, to enhance charging speed through electronic-structure coupling. UV LED-generated light irradiation on to the electrode interface boosted the ion diffusion and lithium cation addition by a factor of 1.3 during electrochemical lithiation, resulting in a 30% decrease in charging time under ambient conditions. Red LED light was not effective in accelerating the reaction as it does not provide sufficient energy. The first-principles calculations support the concept that UV illumination generates charges by overcoming the material’s bandgap and effectively reducing it through the introduction of additional titanium defect states.

Original languageEnglish (US)
Article number020521
JournalJournal of the Electrochemical Society
Volume171
Issue number2
DOIs
StatePublished - Feb 1 2024

Keywords

  • batteries - Li-ion
  • extreme fast charging
  • lithium titanium oxide
  • LTO
  • photoelectrochemistry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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