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Biochemistry-Enabled 3D Foams for Ultrafast Battery Cathodes.

Yanping Zhou1, Xianhong Rui2, Wenping Sun

  • 1§Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 CleanTech Loop, 637141, Singapore.

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Metal vanadium phosphates (MVPs), including lithium vanadium phosphate (LVP) and sodium vanadium phosphate (NVP), show promise for next-gen batteries. A novel polypeptide-templated synthesis yields 3D foams with superior conductivity and performance for electric vehicles.

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3D nanostructureselastin-like polypeptideslithium ion batterymetal vanadium phosphatessodium ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal vanadium phosphates (MVPs), specifically Li3V2(PO4)3 (LVP) and Na3V2(PO4)3 (NVP), are promising cathode materials for advanced lithium-ion and sodium-ion batteries.
  • Their high theoretical capacity, stability, and operating voltages are attractive, but low electrical and ionic conductivity hinder practical applications, especially in demanding fields like electric vehicles.

Purpose of the Study:

  • To develop a novel synthesis route for creating micro/mesoporous 3D foams of LVP and NVP using elastin-like polypeptides.
  • To enhance the electrochemical performance of LVP and NVP by improving their conductivity and surface area.

Main Methods:

  • A novel synthesis strategy employing elastin-like polypeptides to assemble LVP/NVP micro/mesoporous 3D foams.
  • Characterization using Transmission Electron Microscopy (TEM) to analyze nanoparticle size and carbon shell formation.
  • Electrochemical testing to evaluate rate capabilities and cycle performance.

Main Results:

  • The synthesis successfully produced MVP 3D foams composed of mesoporous nanofibers with MVP nanocrystallites.
  • TEM confirmed LVP/NVP nanoparticles (100-200 nm) coated with a 5 nm carbon shell.
  • The resulting LVP/NVP 3D foams demonstrated ultrafast rate capabilities (e.g., LVP at 79 mAh g⁻¹ at 100C) and excellent cycling stability (nearly 100% retention after 1000 cycles at 100C).

Conclusions:

  • The polypeptide-templated synthesis offers a viable route to overcome the conductivity limitations of LVP and NVP.
  • The engineered MVP 3D foams exhibit significantly enhanced electrochemical performance, surpassing current state-of-the-art materials.
  • These findings position MVP 3D foams as highly competitive cathode materials for next-generation high-performance batteries.