K Ti O @C Microspheres with Enhanced K Intercalation Pseudocapacitance Ensuring Fast Potassium Storage and Long-Term Cycling Stability.

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ID: 82741
2019
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Abstract
Benefiting from the natural abundance and low standard redox potential of potassium, potassium-ion batteries (PIBs) are regarded as one of the most promising alternatives to lithium-ion batteries for low-cost energy storage. However, most PIB electrode materials suffer from sluggish thermodynamic kinetics and dramatic volume expansion during K (de)intercalation. Herein, it is reported on carbon-coated K Ti O microspheres (S-KTO@C) synthesized through a facile spray drying method. Taking advantage of both the porous microstructure and carbon coating, S-KTO@C shows excellent rate capability and cycling stability as an anode material for PIBs. Furthermore, the intimate integration of carbon coating through chemical vapor deposition technology significantly enhances the K intercalation pseudocapacitive behavior. As a proof of concept, a potassium-ion hybrid capacitor is constructed with the S-KTO@C (battery-type anode material) and the activated carbon (capacitor-type cathode material). The assembled device shows a high energy density, high power density, and excellent capacity retention. This work can pave the way for the development of high-performance potassium-based energy storage devices.
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zhao2019ksmall Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shuoqing Zhao, Liubing Dong, Bing Sun, Kang Yan, Jinqiang Zhang, Shuwei Wan, Fengrong He, Paul Munroe, Peter H L Notten, Guoxiu Wang
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Journal Small (Weinheim an der Bergstrasse, Germany)
Year 2019
DOI
10.1002/smll.201906131
URL
Keywords
spray drying chemical vapor deposition anode materials potassium-ion batteries porous microspheres

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