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Reducing the Charge Carrier Transport Barrier in Functionally Layer-Graded Electrodes.

Yanyan Zhang1, Oleksandr I Malyi1, Yuxin Tang1

  • 1Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

Angewandte Chemie (International Ed. in English)
|September 30, 2017
PubMed
Summary

Functionally layer-graded electrodes significantly boost lithium-ion battery performance at high rates. This design overcomes transport limitations in traditional electrodes, enhancing energy storage for electric vehicles and electronics.

Keywords:
TiO2(B)charge carrier barrierfunctionally graded electrodeshigh charging rateslithium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-ion batteries (LIBs) face capacity loss at high charge/discharge rates due to transport barriers in electrodes.
  • This limitation leads to reaction polarization, hindering performance in applications like electric vehicles and consumer electronics.

Purpose of the Study:

  • To design and fabricate a functionally layer-graded electrode to reduce charge carrier transport barriers.
  • To improve the rate capability and overall performance of lithium-ion batteries.

Main Methods:

  • Fabrication of functionally layer-graded electrodes using TiO2 (B) and reduced graphene oxide (RGO).
  • Electrochemical testing of the layer-graded electrodes at high charge/discharge rates (20 C).
  • Comparison of performance with traditionally homogeneous electrodes of the same composition.

Main Results:

  • The layer-graded TiO2(B)/RGO electrodes achieved a capacity of 128 mAh g-1 at 20 C.
  • This performance is substantially higher than homogeneous electrodes (74 mAh g-1 at 20 C).
  • Demonstrated improvement in effective Li-ion diffusivity and electronic conductivity in the graded electrodes.

Conclusions:

  • Functionally layer-graded electrodes effectively mitigate transport limitations in LIBs.
  • This innovative electrode design offers a promising strategy for high-power energy storage applications.
  • Enhanced Li-ion transport and conductivity are key to achieving superior rate performance.