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<p>Titanium dioxide (TiO<sub>2</sub>) is an extremely promising anode material for lithium-ion batteries due to its low cost, minimal volume change, and extended cycle life. However, its electrochemical performance is severely hindered by inherent issues such as poor ionic and electronic conductivity. Here, we design a dual-phase conductor Co@TiO<sub>2</sub>, which contributes a synergistic storage mode consisting of a Li-accepting and an electron-accepting phase. In situ magnetic characterization and experimental results reveal the space charge storage mechanism in addition to traditional insertion mechanisms. Based on these mechanisms, the specific capacity and rate performance of the Co@TiO<sub>2</sub> electrode have been greatly enhanced. Under a current density of 200&#xa0;mA·g<sup>−1</sup>, the specific capacity of Co@TiO<sub>2</sub> reaches 397.2&#xa0;mAh·g<sup>−1</sup>. Upon increasing the current density to 10&#xa0;A·g<sup>−1</sup>, the electrode still maintains a capacity of 83.1&#xa0;mAh·g<sup>−1</sup> after 900 cycles. This result offers a fresh perspective on the structural design of new anode materials to achieve high energy density.</p> Graphical abstract <p>We successfully introduced synergistic storage mode into TiO<sub>2</sub> anode by constructing an electron/ion dual-phase conductor of Co@TiO<sub>2</sub>. The existence of the space-charge storage mechanism is demonstrated through in-situ magnetic measurements and thermodynamic fitting. Under the synergistic effects of traditional intercalation and space-charge interfacial storage, its specific capacity and rate performance have been significantly improved.</p>

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Accelerating charging and elevating capacity of TiO2 by interface space charge storage

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Jia-Xiang Sun,
  • Shu-Hui Liu,
  • Li-Yan Chen,
  • Ding-Ding Zhu,
  • Hai-Xia Yu,
  • Yi-Ze Niu,
  • Le-Qing Zhang,
  • Qing-Hao Li,
  • Yan He,
  • Guo-Xing Miao,
  • Gui-Huan Chen,
  • Qiang Li

摘要

Titanium dioxide (TiO2) is an extremely promising anode material for lithium-ion batteries due to its low cost, minimal volume change, and extended cycle life. However, its electrochemical performance is severely hindered by inherent issues such as poor ionic and electronic conductivity. Here, we design a dual-phase conductor Co@TiO2, which contributes a synergistic storage mode consisting of a Li-accepting and an electron-accepting phase. In situ magnetic characterization and experimental results reveal the space charge storage mechanism in addition to traditional insertion mechanisms. Based on these mechanisms, the specific capacity and rate performance of the Co@TiO2 electrode have been greatly enhanced. Under a current density of 200 mA·g−1, the specific capacity of Co@TiO2 reaches 397.2 mAh·g−1. Upon increasing the current density to 10 A·g−1, the electrode still maintains a capacity of 83.1 mAh·g−1 after 900 cycles. This result offers a fresh perspective on the structural design of new anode materials to achieve high energy density.

Graphical abstract

We successfully introduced synergistic storage mode into TiO2 anode by constructing an electron/ion dual-phase conductor of Co@TiO2. The existence of the space-charge storage mechanism is demonstrated through in-situ magnetic measurements and thermodynamic fitting. Under the synergistic effects of traditional intercalation and space-charge interfacial storage, its specific capacity and rate performance have been significantly improved.