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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Published on: November 11, 2013

High Capacity NbS₂-Based Anodes for Li-Ion Batteries.

Alexandra Carvalho¹, Vivek Nair², Sergio G Echeverrigaray³

¹Institute for Functional Intelligent Materials, National University of Singapore, 117544, Singapore.

|August 12, 2024

Summary

Niobium sulfide (NbS2) exhibits high lithium storage capacity, potentially doubling graphite anode performance. Experimental results show even greater capacity, suggesting robust anode performance with defects.

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Area of Science:

Materials Science
Electrochemistry
Computational Chemistry

Background:

Development of advanced anode materials is crucial for next-generation lithium-ion batteries.
Graphite anodes have limitations in specific capacity.
Niobium sulfide (NbS2) is explored as a potential high-capacity anode material.

Purpose of the Study:

To investigate the lithium storage capacity of the 2H phase of niobium sulfide (NbS2).
To compare the theoretical and experimental lithium capacities of NbS2 anodes.
To assess the impact of defects on NbS2 anode performance.

Main Methods:

Density functional theory (DFT) calculations to model lithium intercalation.
Experimental battery prototyping using NbS2-based anodes.
Analysis of specific capacity under various conditions (pristine, oxidized, with defects).

Main Results:

Theoretical calculations predict double-layer lithium intercalation in NbS2, yielding specific capacities of 340.8 mAh/g (pristine) and 681.6 mAh/g (oxidized).
Defects enhance capacity and demonstrate partially reversible conversion, indicating robust performance.
Experimental results show a first specific capacity of ~1,130 mAh/g, surpassing theoretical predictions.

Conclusions:

2H-NbS2 is a promising high-capacity anode material for lithium-ion batteries.
Experimental capacities significantly exceed theoretical predictions, highlighting the material's potential.
NbS2 anodes demonstrate robustness and high performance, even in the presence of defects.