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Related Experiment Video

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Dual-Functional Surface Engineering of Single-Crystal NMC Cathodes via Residue-to-Coating Conversion for Enhanced

Shadab Ali Ahmed1, Tripti Agnihotri1, Ashok Ranjan2

  • 1Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan.

Small (Weinheim an Der Bergstrasse, Germany)
|November 19, 2025
PubMed
Summary

A new surface modification using lithium dihydrogen phosphate enhances nickel-rich cathode materials for lithium-ion batteries. This improves stability and performance, crucial for next-generation energy storage.

Keywords:
In situ FT‐EXAFSNi‐rich cathodeXRFresidual lithiumsynergistic modification

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Nickel-rich layered oxides (NMC) are key for high-energy-density lithium-ion batteries.
  • Surface instability and residual lithium compounds hinder NMC performance and scalability.

Purpose of the Study:

  • To develop a dual-functional surface modification for single crystal nickel-rich cathode materials (SCNMC).
  • To address surface instability and residual lithium compounds using lithium dihydrogen phosphate (LiH2PO4).

Main Methods:

  • A wet impregnation method to convert surface contaminants (LiOH, Li2CO3) into a Li3PO4 coating.
  • Titration and in situ Gas Chromatography-Mass Spectrometry (GC-MS) to confirm contaminant transformation.
  • Electrochemical testing, Synchrotron X-ray Absorption Spectroscopy (XAS), and post-mortem analyses.

Main Results:

  • A stable ≈4 nm Li3PO4 coating was formed, enhancing structural stability and suppressing nickel migration.
  • Electrolyte side reactions were mitigated, leading to improved cycling stability (72.96% vs 18.25% capacity retention).
  • Enhanced rate capability and Li+ diffusion kinetics were observed, with preserved Ni oxidation states.

Conclusions:

  • The LiH2PO4 surface modification effectively stabilizes SCNMC cathode materials.
  • This strategy significantly improves electrochemical performance and offers a scalable solution for advanced lithium-ion batteries.