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One-Step Integrated Surface Modification To Build a Stable Interface on High-Voltage Cathode for Lithium-Ion

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Summary

Modifying spinel lithium nickel manganese oxide (LiNi0.5Mn1.5O4 or LNMO) with lithium vanadium phosphate (Li3V2(PO4)3 or LVPO) enhances its stability for next-generation energy storage. This surface modification improves cycling and rate performance by suppressing side reactions.

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LiNi0.5Mn1.5O4fast ion conductorsintegrated surface modificationlithium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Spinel lithium nickel manganese oxide (LiNi0.5Mn1.5O4 or LNMO) is a promising cathode material for advanced energy storage.
  • LNMO's application is limited by poor electrochemical stability, bulk/interface degradation, and side reactions at high voltages.

Purpose of the Study:

  • To enhance the interface properties and electrochemical stability of LNMO.
  • To improve the cycling and rate performance of LNMO for energy storage applications.

Main Methods:

  • A facile one-step method was employed to modify the surface of LNMO with lithium vanadium phosphate (Li3V2(PO4)3 or LVPO).
  • Electrochemical performance was evaluated through cycling tests at room temperature and elevated temperatures, as well as rate capability tests.

Main Results:

  • 1 wt% LVPO-modified LNMO (LVPO-LNMO) demonstrated excellent cycling stability, retaining 87.8% capacity after 500 cycles at room temperature and 82.4% after 150 cycles at 55 °C.
  • The LVPO coating significantly improved rate performance, achieving 90.4 mAh g-1 at 20C.
  • The LVPO layer suppressed surface side reactions, mitigated transition metal ion dissolution, and formed a V-involved surface solid solution (Li-Ni-Mn-V-O), reducing charge-transfer resistance.

Conclusions:

  • Surface modification of LNMO with LVPO effectively enhances electrochemical stability and performance.
  • The formation of a V-involved transition layer is crucial for improved kinetics and structural integrity, making LVPO-LNMO a viable candidate for high-performance energy storage.