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Interface-Stabilized Layered Lithium Ni-Rich Oxide Cathode via Surface Functionalization with Titanium Silicate.

Giseung Lee1, Kwangeun Jung1, Yongho Lee2

  • 1Department of Chemistry, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea.

ACS Applied Materials & Interfaces
|September 29, 2021
PubMed
Summary

Functionalizing nickel-rich lithium metal oxide cathodes with nano-titanium silicate enhances lithium-ion battery performance. This coating improves cycling stability by preventing electrolyte decomposition and maintaining particle hardness.

Keywords:
high nickellayered oxidelithium-ion batterysurface coatingtitanium silicate

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Nickel-rich lithium metal oxides are promising next-generation cathodes for lithium-ion batteries.
  • High surface reactivity of these materials leads to rapid cycling retention fading.
  • Controlling surface reactivity is crucial for improving battery lifespan.

Purpose of the Study:

  • To enhance the cycling performance of nickel-rich lithium metal oxide cathode materials.
  • To investigate the effectiveness of nano-titanium silicate as a functionalization agent.
  • To understand the mechanism behind improved stability.

Main Methods:

  • Functionalization of nickel-rich lithium metal oxide cathodes using nano-titanium silicate via thermal treatment.
  • Characterization of material topology using scanning electron microscopy.
  • Quantitative analysis of mechanical properties using microindentation.
  • Electrochemical cycling performance evaluation and ex situ analysis.

Main Results:

  • Nano-titanium silicate functionalization effectively inhibited persistent electrolyte decomposition.
  • Improved cycling behavior was observed in functionalized cathode cells.
  • Particle hardness was maintained, and transition metal dissolution was inhibited after 100 cycles.
  • Scanning electron microscopy and microindentation confirmed enhanced material properties.

Conclusions:

  • Nano-titanium silicate coating is an effective strategy to improve the cycling performance of nickel-rich lithium metal oxide cathodes.
  • The functionalization enhances battery stability by preventing electrolyte decomposition and maintaining structural integrity.
  • This approach offers a viable pathway for developing advanced lithium-ion batteries.