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High-performance K-ion half/full batteries with superb rate capability and cycle stability.

Xianlu Lu1,2, Xinfeng Zhang1,3, Yapeng Zheng1

  • 1Institute of Micro/Nano Materials and Devices, Ningbo University of Technology, Ningbo 315211, P. R. China.

Proceedings of the National Academy of Sciences of the United States of America
|June 3, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces advanced potassium-ion (K-ion) batteries with exceptional rate capability and cycle stability. These K-ion batteries demonstrate superior performance for practical energy storage applications.

Keywords:
B-dopingK-ion batteriescarbon materialscycle stabilityspecific capacity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Potassium-ion (K-ion) batteries are a promising alternative to lithium-ion batteries due to potassium's abundance and low cost.
  • Developing K-ion batteries with high energy density, excellent rate capability, and long cycle life remains a significant challenge for practical applications.

Purpose of the Study:

  • To explore advanced K-ion battery materials with enhanced electrochemical performance.
  • To achieve high rate capability and superior cycle stability for practical K-ion battery applications.

Main Methods:

  • Fabrication and electrochemical testing of K-ion half cells and full cells.
  • Performance evaluation including specific capacity, rate capability, and cycle stability.

Main Results:

  • The K-ion half cell achieved a specific capacity of 330 mA h g-1 at 100 mA g-1 with 120% capacity retention after 2,000 cycles at 2,000 mA g-1.
  • The full cell demonstrated 98% capacity retention over 750 cycles at 500 mA g-1.
  • Performance metrics surpass those reported for most carbon-based K-ion battery materials.

Conclusions:

  • The developed K-ion battery materials offer excellent rate capability and cycle stability.
  • This work signifies a step towards practical applications of advanced K-ion batteries.
  • The findings highlight the potential of these materials for next-generation energy storage solutions.