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<p>Sodium-ion batteries are receiving more and more attention due to their low cost and abundant sodium storage capacity, and are considered to be a promising alternative to lithium-ion batteries. A large number of studies have shown that constructing heterostructures are considered an effective strategy to solve the hysteresis problem of electronic and ion dynamics in sodium-ion battery anode materials. Herein, a nickel–cobalt bimetallic coordination polymer (NiCoCP) was synthesized using a coprecipitation method, and a CoSe<sub>2</sub>@NiSe<sub>2</sub> cross-stacked structure was obtained through high-temperature carbonization and selenization processes. CoSe<sub>2</sub>@NiSe<sub>2</sub> has a unique heterostructure and carbon film, which synergistically increases a large number of adsorption sites and alleviates the diffusion energy barrier, thereby improving the rapid diffusion kinetics of Na<sup>+</sup> ions. It has superior rate performance and long-lasting cycle life. For sodium-ion batteries (SIBs), the specific capacity of CoSe<sub>2</sub>@NiSe<sub>2</sub> is around 460&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup> after 400 cycles at 1.0&#xa0;A&#xa0;g<sup>−1</sup>. For potassium-ion batteries (PIBs), CoSe<sub>2</sub>@NiSe<sub>2</sub> also exhibits excellent cycling stability, maintaining a specific capacity of 160&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup> after 700 cycles at 1.0&#xa0;A&#xa0;g<sup>−1</sup>. This study provides a new way to prepare metal selenide heterostructure as the promising anode material for SIBs.</p>

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Cobalt–Nickel Cyano Coordination Polymer-Derived Square CoSe2@NiSe2 Nanosheets for Advanced Na+/K+ Batteries

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Peng Yang,
  • Jian Zhou,
  • Yufei Zhang,
  • Haosen Fan

摘要

Sodium-ion batteries are receiving more and more attention due to their low cost and abundant sodium storage capacity, and are considered to be a promising alternative to lithium-ion batteries. A large number of studies have shown that constructing heterostructures are considered an effective strategy to solve the hysteresis problem of electronic and ion dynamics in sodium-ion battery anode materials. Herein, a nickel–cobalt bimetallic coordination polymer (NiCoCP) was synthesized using a coprecipitation method, and a CoSe2@NiSe2 cross-stacked structure was obtained through high-temperature carbonization and selenization processes. CoSe2@NiSe2 has a unique heterostructure and carbon film, which synergistically increases a large number of adsorption sites and alleviates the diffusion energy barrier, thereby improving the rapid diffusion kinetics of Na+ ions. It has superior rate performance and long-lasting cycle life. For sodium-ion batteries (SIBs), the specific capacity of CoSe2@NiSe2 is around 460 mA h g−1 after 400 cycles at 1.0 A g−1. For potassium-ion batteries (PIBs), CoSe2@NiSe2 also exhibits excellent cycling stability, maintaining a specific capacity of 160 mA h g−1 after 700 cycles at 1.0 A g−1. This study provides a new way to prepare metal selenide heterostructure as the promising anode material for SIBs.