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A conductive-robust ternary binder for high-loading LiFePO4 cathodes.

Qinghuang Lian1, Yuhan Hua1, Yaying Guan1

  • 1College of Materials Science and Engineering, Huaqiao University, Xiamen, Fujian, 361021, China. hwchen@hqu.edu.cn.

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A new ternary functional binder (PCC) enhances high-loading lithium iron phosphate (LFP) cathodes by improving conductivity and mechanical stability. This binder enables high-capacity, long-lasting LFP batteries with reduced material usage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-loading lithium iron phosphate (LFP) cathodes are crucial for enhancing energy density in batteries.
  • Low binder content is essential for high-loading electrodes, but LFP's low conductivity and electrode stress pose challenges.
  • Effective binder systems are needed to overcome transport limitations and ensure cycle life and safety.

Purpose of the Study:

  • To design and evaluate a novel ternary functional binder for high-loading LFP cathodes.
  • To improve electronic conductivity, mechanical integrity, and electrochemical performance of LFP electrodes.
  • To demonstrate a viable strategy for low-binder, high-loading cathode development.

Main Methods:

  • Development of a ternary binder comprising poly(3,4-ethylenedioxythiophene: poly(styrenesulfonate) (PEDOT:PSS), carboxymethyl cellulose (CMC), and single-walled carbon nanotubes (CNTs) - the PCC binder.
  • Synergistic electronic-mechanical coupling design of the binder components.
  • Electrochemical testing of LFP cathodes with high areal loading (∼22 mg cm-2) using the PCC binder compared to a conventional binder (LA133).

Main Results:

  • The PCC binder significantly reduced resistance and suppressed polarization in LFP electrodes.
  • Electrodes with the PCC binder exhibited improved cycling stability compared to those with LA133.
  • High-loading LFP cathodes (∼22 mg cm-2) retained 73.4% capacity after 2800 cycles.

Conclusions:

  • The ternary PCC binder effectively addresses the challenges of low-binder, high-loading LFP cathodes.
  • Synergistic electronic-mechanical coupling in the binder enhances electrode performance and durability.
  • This binder design strategy is viable for developing next-generation high-energy-density LFP batteries.