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An Abnormal 3.7 Volt O3-Type Sodium-Ion Battery Cathode.

Peng-Fei Wang1,2, Hanshen Xin3, Tong-Tong Zuo1,2

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PubMed
Summary

Developing high-voltage O3-type cathodes for sodium-ion batteries (SIBs) is challenging. A novel Na0.7Ni0.35Sn0.65O2 material achieves a record 3.7 V redox potential, enhancing energy density.

Keywords:
O3 phaseP3 phasecathodeshigh voltageorbital hybridizations

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Layered O3-type sodium oxides (NaMO2) suffer from an O3-P3 phase transition at low voltage (~3 V vs. Na+/Na), limiting energy density in sodium-ion batteries (SIBs).
  • Achieving high-voltage O3-type cathodes is difficult due to challenges in modulating the phase-transition voltage.

Purpose of the Study:

  • To design and investigate a novel O3-type sodium insertion material for SIBs with an enhanced operating voltage.
  • To understand the orbital-level mechanisms governing the redox potentials in O3-NaMO2 cathodes.

Main Methods:

  • Synthesis and characterization of the O3-type Na0.7Ni0.35Sn0.65O2 material.
  • Electrochemical evaluation of the material's performance in SIBs.
  • Theoretical analysis of electronic structure and bonding to understand redox potential origins.

Main Results:

  • The designed Na0.7Ni0.35Sn0.65O2 exhibits a highest redox potential of 3.7 V (vs. Na+/Na) for the Ni2+/Ni3+ couple among reported O3-type materials.
  • Increased Ni-O bond ionicity, attributed to reduced orbital overlap within the MO2 slabs, is responsible for the elevated operating potential.
  • The material demonstrates potential for improved energy density in SIB cathodes.

Conclusions:

  • A new O3-type cathode material, Na0.7Ni0.35Sn0.65O2, has been successfully developed, achieving a record high redox potential.
  • Orbital interactions provide a fundamental understanding for tailoring the operating potentials of O3-NaMO2 cathodes.
  • The presented strategy offers a pathway for designing high-performance electrodes for advanced SIBs.