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<p>We report a novel Au-Ti₃C₂T<sub>x</sub>-C (Au-TC) hybrid nanocomposite anode, synthesized through interfacial coordination and structural modulation. The gold quantum dots (Au QDs) are selectively anchored with Ti₃C₂Tₓ MXene <i>via</i> electrostatic force. Driven by the effective work function (ϕ<sub>eff</sub>) of Au QDs, a polarized hosting interface (PHI) is formed, promoting electron transfer from Au to Ti₃C₂Tₓ and inducing interfacial charge redistribution, lattice distortion, and stabilization of electron-deficient nanoscopic pouches. Our experimental results and density functional theory (DFT) calculations also confirm that the PHI significantly enhanced Li⁺ adsorption by inducing electron-deficient pouches. These pouches serve as efficient Li⁺ hosting sites during intercalation. The Au QDs also induced lattice distortions, which generated defects, including twin boundaries and junction points in Ti₃C₂Tₓ, that enhanced Li⁺ intercalation. The long cycling test demonstrates that Au-TC anode 465 mAh g<sup>−</sup>¹ outperforms 20.9% and 113.6% higher capacity in comparison to Ti₃C₂Tₓ-C and pure carbon (initial Coulombic efficiency of 73%) and excellent cycling stability at 0.1&#xa0;A g⁻¹ current density. Furthermore, the Au-TC anode exhibits a low charge transfer resistance of 24 Ω and a superior lithium-ion diffusion coefficient of 4.72 × 10⁻¹¹ cm²/s. These results confirm Au-TC as a high-capacity and fast charge rate anode material for next-generation lithium-ion batteries.</p>

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Au quantum-dots induced electron-deficient pouch in Au-Ti polarized hosting interface for high-capacity lithium-ion batteries

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  • 出版模式：

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  • 发表日期：

    2026年2月16日

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  • Saima Batool,
  • Xingyu Chen,
  • Muhammad Idrees,
  • Junguo Xu

摘要

We report a novel Au-Ti₃C₂Tx-C (Au-TC) hybrid nanocomposite anode, synthesized through interfacial coordination and structural modulation. The gold quantum dots (Au QDs) are selectively anchored with Ti₃C₂Tₓ MXene via electrostatic force. Driven by the effective work function (ϕeff) of Au QDs, a polarized hosting interface (PHI) is formed, promoting electron transfer from Au to Ti₃C₂Tₓ and inducing interfacial charge redistribution, lattice distortion, and stabilization of electron-deficient nanoscopic pouches. Our experimental results and density functional theory (DFT) calculations also confirm that the PHI significantly enhanced Li⁺ adsorption by inducing electron-deficient pouches. These pouches serve as efficient Li⁺ hosting sites during intercalation. The Au QDs also induced lattice distortions, which generated defects, including twin boundaries and junction points in Ti₃C₂Tₓ, that enhanced Li⁺ intercalation. The long cycling test demonstrates that Au-TC anode 465 mAh g−¹ outperforms 20.9% and 113.6% higher capacity in comparison to Ti₃C₂Tₓ-C and pure carbon (initial Coulombic efficiency of 73%) and excellent cycling stability at 0.1 A g⁻¹ current density. Furthermore, the Au-TC anode exhibits a low charge transfer resistance of 24 Ω and a superior lithium-ion diffusion coefficient of 4.72 × 10⁻¹¹ cm²/s. These results confirm Au-TC as a high-capacity and fast charge rate anode material for next-generation lithium-ion batteries.