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Zero-Strain Na3 V2 (PO4 )2 F3 @Rgo/CNT Composite as a Wide-Temperature-Tolerance Cathode for Na-Ion Batteries with

Chenglong Shi1, Junling Xu1, Tao Tao1

  • 1School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China.

Small Methods
|November 27, 2023
PubMed
Summary

Researchers developed a novel composite cathode for sodium-ion batteries (SIBs) that enhances performance across wide temperatures. This advanced material offers improved cycling stability and energy density, addressing key challenges in SIB technology.

Keywords:
Na-ion batteriescathodesultrahigh-ratewide-temperature-tolerancezero-strain Na3V2(PO4)2F3

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium-ion batteries (SIBs) are a promising alternative to lithium-ion batteries.
  • Current SIBs face limitations in rate capability, cycling stability, and performance at variable temperatures.

Purpose of the Study:

  • To construct a hierarchical composite cathode for SIBs.
  • To investigate the Na+ storage mechanism of the composite.
  • To evaluate the electrochemical performance of the composite, especially at variable temperatures.

Main Methods:

  • Synthesis of a hierarchical Na3V2(PO4)2F3 (NVPF) @reduced graphene oxide (rGO)/carbon nanotube (CNT) composite (NVPF@rGO/CNT).
  • Comprehensive characterization to understand the Na+ storage mechanism.
  • Assembly and testing of a full SIB cell with a hard carbon anode and NVPF@rGO/CNT cathode.

Main Results:

  • The NVPF@rGO/CNT composite exhibits a 0D NVPF nanoparticle structure coated by a 3D rGO/CNT conductive network.
  • The composite demonstrates fast ionic/electronic transport and excellent structural stability from -40 to 50 °C.
  • A full cell achieved a capacity of 105.2 mAh g-1 at 0.2 C and an energy density of 242.7 Wh kg-1.

Conclusions:

  • The developed NVPF@rGO/CNT composite effectively addresses SIB challenges, offering superior performance.
  • The unique structure enhances ionic and electronic conductivity, reducing diffusion distances.
  • This study provides insights for developing high-energy and power-density cathode materials for SIBs.