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Utilizing an Oxygen-Rich Interface by Hydroxyapatite to Regulate the Linear Diffusion for the Stable Solid-State

Chenpeng Xi1, Xiancai Cui1, Ran Zhang2

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Hydroxyapatite nanowires enhance polymer electrolytes for improved lithium-ion battery performance. This novel approach boosts ion diffusion and stability, paving the way for advanced solid-state electrolytes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Polymer-based solid-state electrolytes (SSE) are crucial for next-generation batteries.
  • Improving lithium-ion dissociation and diffusion in SSEs remains a significant challenge.

Purpose of the Study:

  • To develop a cost-effective and high-performance polymer-based SSE using hydroxyapatite (HAP) nanowires.
  • To investigate the mechanism of enhanced ion transport and electrochemical stability.

Main Methods:

  • Incorporation of 3D HAP nanowires into polyethylene oxide (PEO) matrix.
  • Electrochemical characterization including chronoamperometry and in situ observation.
  • Spectroscopic analysis using nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR).

Main Results:

  • HAP's oxygen-rich interface facilitated lithium salt dissociation and ion diffusion.
  • TFSI anions coordinated with Ca ions, promoting free lithium ion states.
  • HAP regulated ion diffusion from spherical to linear planar.
  • Enhanced high-voltage stability by inhibiting PEO radical formation.
  • Achieved initial specific charge capacity of 148.8 mA h/g at 2C with 95.17% Coulombic efficiency.
  • Demonstrated excellent cycling stability with 125.5 mA h/g capacity and 99.91% retention after 100 cycles.

Conclusions:

  • The HAP/PEO composite shows significant promise as an advanced polymer-based SSE.
  • The oxygen-rich interface strategy offers a new pathway for designing high-performance solid-state electrolytes.
  • This approach could accelerate the development of safer and more efficient lithium-ion batteries.