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<p>Na<sub>0.44</sub>MnO<sub>2</sub> (NMO), a pristine material, has been achieved through the application of the rheological phase reaction technique, and carbon quantum dots (CQDs) were also successfully synthesized. CQDs are composited onto the surface of the native material using the ultrasound-assisted method, to form a series of Na<sub>0.44</sub>MnO<sub>2</sub>/CQDs (NMO/CQDs) composites with different mass ratios, which were assembled into sodium-ion batteries (SIBs) as the cathode material. Physical characterization showed that the crystal characteristics of NMO were not changed by the arrival of the CQDs, the surface of NMO was successfully compounded with CQDs, and the morphological features of NMO were not changed. Charge/discharge tests results showed that the NMO/CQD-3 wt.% composite material possessed a highest discharge specific capacity of up to 141.7&#xa0;mAh&#xa0;g<sup>−1</sup>, which is a significant increase compared with that of the native material. In conclusion, the utilization of ultrasound-assisted techniques in the synthesis process of NMO/CQD composites as cathode materials for SIBs has the potential to enhance the electrochemical performance of NMO.</p>

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Ultrasound-Assisted Synthesis of Na0.44MnO2/CQDs Composites as Cathode Materials with Long Life and Rate Capability for Sodium-Ion Batteries

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Xiaoli Cao,
  • Xinwei Wang,
  • Limin Zhu,
  • Daorong Li

摘要

Na0.44MnO2 (NMO), a pristine material, has been achieved through the application of the rheological phase reaction technique, and carbon quantum dots (CQDs) were also successfully synthesized. CQDs are composited onto the surface of the native material using the ultrasound-assisted method, to form a series of Na0.44MnO2/CQDs (NMO/CQDs) composites with different mass ratios, which were assembled into sodium-ion batteries (SIBs) as the cathode material. Physical characterization showed that the crystal characteristics of NMO were not changed by the arrival of the CQDs, the surface of NMO was successfully compounded with CQDs, and the morphological features of NMO were not changed. Charge/discharge tests results showed that the NMO/CQD-3 wt.% composite material possessed a highest discharge specific capacity of up to 141.7 mAh g−1, which is a significant increase compared with that of the native material. In conclusion, the utilization of ultrasound-assisted techniques in the synthesis process of NMO/CQD composites as cathode materials for SIBs has the potential to enhance the electrochemical performance of NMO.