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Two Steps Li Ion Storage Mechanism in Ruddlesden-Popper Li2La2Ti3O10.

Mi Jang1, Sunhyun Hwang2, Ji Su Chae1

  • 1Emerging Materials R&D Division, Korea Institute of Ceramic Engineering & Technology, Jinju, Gyeongnam, 52851, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

A new perovskite anode material, Li₂La₂Ti₃O₁₀ (RPLLTO), shows promise for high-energy lithium-ion batteries (LIBs). It offers stable cycling and a significant capacity, advancing anode material development.

Keywords:
Li‐ion batteries (LiBs)anode materialslayered perovskite structuresruddlesden–Popper Li2La2Ti3O10(RPLLTO)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-energy-density lithium-ion batteries (LIBs) require advanced anode materials for improved performance and longevity.
  • Layered perovskite structures are underexplored as potential anode materials for LIBs.

Purpose of the Study:

  • To investigate the electrochemical performance and charge/discharge mechanism of a novel Ruddlesden-Popper Li₂La₂Ti₃O₁₀ (RPLLTO) as an anode material for LIBs.
  • To understand the structural and electronic changes in RPLLTO during lithium-ion insertion.

Main Methods:

  • Synthesis and characterization of RPLLTO.
  • Electrochemical testing including galvanostatic cycling and cyclic voltammetry.
  • In situ X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy.
  • X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) analysis.

Main Results:

  • RPLLTO exhibits two distinct voltage plateaus at approximately 0.6 and 0.4 V vs Li/Li⁺.
  • Titanium reduction from Ti⁴⁺ to Ti²⁺ was observed, correlating with a capacity of 170 mAh·g⁻¹.
  • In situ studies revealed minimal volume change (4%) during lithiation due to anisotropic expansion/contraction.
  • RPLLTO demonstrated excellent structural stability, retaining 88% of its capacity after 1000 cycles.

Conclusions:

  • RPLLTO is a viable anode material for lithium-ion batteries, offering good capacity and exceptional cycling stability.
  • The layered perovskite structure of RPLLTO facilitates reversible lithium-ion insertion with minimal structural degradation.
  • This work expands the library of perovskite-based anode materials for next-generation energy storage devices.