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A study on LiFePO4/graphite cells with built-in Li4Ti5O12 reference electrodes.

Shouzhong Yi1,2, Bo Wang1, Ziang Chen1

  • 1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology 150001 Harbin China wangrui001@hit.edu.cn wangdianlonghit@163.com.

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|May 11, 2022
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Lithium-ion cells now feature built-in Lithium Titanate Oxide (LTO) reference electrodes for stable, long-term in situ monitoring of electrochemical performance. This innovation simplifies tracking potentials and diffusion coefficients in anodes and cathodes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Electrochemical stability is crucial for reliable reference electrodes in lithium-ion cells.
  • Existing reference electrode methods can be complex or lack long-term stability.
  • Lithium Titanate Oxide (LTO) exhibits superior electrochemical stability.

Purpose of the Study:

  • To design and fabricate lithium-ion cells incorporating LTO as a built-in reference electrode.
  • To evaluate the performance and characteristics of LTO reference electrodes for in situ monitoring.
  • To assess the feasibility of LTO for long-term monitoring of electrochemical parameters.

Main Methods:

  • Fabrication of LiFePO4 (LFP)/graphite lithium-ion cells with integrated LTO reference electrodes.
  • Measurement and analysis of LTO reference electrode characteristics within the cells.
  • In situ monitoring of potentials, Li+ diffusion coefficient (D_Li), and electrochemical impedance spectroscopy (EIS).

Main Results:

  • LTO built-in reference electrodes are simple to prepare and demonstrate excellent feasibility.
  • Successful long-term in situ monitoring of potentials and electrochemical parameters for both anodes and cathodes.
  • LTO electrodes provide reliable data for Li+ diffusion coefficients and EIS information.

Conclusions:

  • LTO is a viable and stable material for integrated reference electrodes in lithium-ion cells.
  • This approach enables simplified, long-term in situ electrochemical monitoring.
  • The use of LTO reference electrodes holds significant potential for various lithium-ion cell chemistries.