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High Performance Lithium-Ion Batteries Using Layered 2H-MoTe2 as Anode.

Manas Ranjan Panda1,2,3,4, Rashmi Gangwar5, Divyamahalakshmi Muthuraj2

  • 1IITB Monash Research Academy, Bombay, Powai, Mumbai, 400076, India.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

Molybdenum ditelluride (MoTe2) shows promise as an efficient anode material for lithium-ion batteries (LIBs). This 2D material offers high capacity and stability, addressing key challenges in battery performance.

Keywords:
anode materialslithium-storage mechanismsmolybdenum ditelluridesoperando X-ray absorption spectroscopy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Low electronic and ionic conductivity are major challenges for lithium-ion battery (LIB) electrode materials.
  • Two-dimensional (2D) van der Waals materials are attractive for ion migration due to their conductivity and weak interlayer interactions.
  • Molybdenum ditelluride (MoTe2) is a promising 2D material for energy storage, with the hexagonal 2H-MoTe2 phase potentially offering superior ion insertion/deinsertion.

Purpose of the Study:

  • To investigate the potential of 2H-molybdenum ditelluride (MoTe2) as an efficient anode material for lithium-ion batteries (LIBs).
  • To characterize the electrochemical performance, including specific capacity and cycling stability, of 2H-MoTe2 anodes.
  • To demonstrate a full-cell prototype utilizing 2H-MoTe2 and elucidate its lithium storage mechanism.

Main Methods:

  • Synthesis of 2H-molybdenum ditelluride (MoTe2) via a solid-state route.
  • Electrochemical testing of 2H-MoTe2 as an anode in lithium-ion batteries (LIBs), including capacity, cycling, and rate performance.
  • Fabrication and testing of a full-cell prototype using 2H-MoTe2 anode and lithium cobalt oxide cathode.
  • In situ X-ray absorption near-edge structure (XANES) spectroscopy and density functional theory (DFT) calculations to study the lithium storage mechanism.

Main Results:

  • The synthesized 2H-MoTe2 exhibited a high initial specific capacity of 432 mAh g⁻¹.
  • Excellent reversible specific capacity of 291 mAh g⁻¹ was maintained after 260 cycles at 1.0 A g⁻¹.
  • A full-cell prototype demonstrated a high energy density of 454 Wh kg⁻¹ (MoTe2 mass basis) with 80% capacity retention over 100 cycles.
  • Synchrotron-based in situ XANES and DFT calculations revealed the lithium reaction pathway and storage mechanism.

Conclusions:

  • 2H-molybdenum ditelluride (MoTe2) is an effective anode material for lithium-ion batteries (LIBs), offering high capacity and stability.
  • The 2D nature and electronic properties of 2H-MoTe2 facilitate efficient lithium-ion storage.
  • This study provides fundamental insights into the electrochemical behavior of 2H-MoTe2, paving the way for advanced energy storage applications.