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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Large-format fiber-shaped lithium-ion batteries (L-FLIBs) are crucial for flexible and wearable electronics.
  • Scaling up L-FLIBs leads to cell polarization and poor active material utilization due to heterogeneous electric fields.
  • The impact of electric field heterogeneity on 1D fiber battery performance is not well understood.

Purpose of the Study:

  • To investigate electron transport mechanisms in L-FLIBs.
  • To develop an optimized dual-terminal cell configuration for electric field homogenization.
  • To enhance electrochemical behavior and performance of scaled-up L-FLIBs.

Main Methods:

  • Systematic investigation of electron transport mechanisms.
  • Development of an optimized dual-terminal cell configuration.
  • Equivalent circuit modeling and experimental validation.

Main Results:

  • A strategic electron collection terminal design was developed to create symmetric electric fields along the fiber length.
  • Electrochemical heterogeneity was effectively addressed, enhancing redox kinetics.
  • A 60% reduction in internal resistance was achieved.
  • A 10-meter-long L-FLIB with 1 Ah capacity was successfully fabricated.

Conclusions:

  • Optimized dual-terminal configuration homogenizes electric fields in L-FLIBs, overcoming performance limitations.
  • This approach significantly improves internal resistance and capacity for long fiber cells.
  • The developed L-FLIBs are suitable for practical applications, demonstrated by integration into a fabric power bank.