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Computational Investigation of Carbon Based Anode Materials for Li- and Post-Li- Ion Batteries
Jafar Azizi1, Axel Groß1,2, Holger Euchner3
1Institute of Theoretical Chemistry, Ulm University, D-, 89081, Ulm.
Chemsuschem
|February 27, 2024
Summary
Hard carbons are promising anodes for sodium ion batteries due to their high capacity. Defects in their nanostructure are key to stabilizing alkali metal storage and understanding performance.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Chemistry
Background:
- Graphite is unsuitable for sodium ion batteries due to low sodium intercalation capacity.
- Hard carbons offer high capacities and low insertion potentials, making them promising anode materials for sodium and potassium ion batteries.
- The nanostructure, including defects, significantly influences hard carbon performance, but its exact role in ion storage is not fully understood.
Purpose of the Study:
- To investigate the role of defects in the intercalation and storage of lithium, sodium, and potassium in graphitic model structures.
- To elucidate the relationship between structural defects and alkali metal ion storage in hard carbon anodes.
- To correlate theoretical calculations with experimental observations like Raman spectroscopy.
Main Methods:
- Density functional theory (DFT) calculations were employed to model alkali metal intercalation in graphitic structures with varying defect configurations.
- Phonon and band structure calculations were performed to analyze the electronic and vibrational properties.
- Theoretical findings were used to interpret characteristic Raman features associated with alkali metal intercalation.
Main Results:
- Defects in graphitic structures significantly stabilize the intercalation of larger alkali metal ion contents.
- DFT calculations confirm the crucial role of defects in enhancing ion storage capacity.
- Phonon and band structure calculations successfully explain observed Raman spectra, enabling quantification of alkali metal intercalation.
Conclusions:
- Defects are critical for enhancing the performance of hard carbon anodes in sodium ion batteries.
- Computational methods, including DFT and phonon/band structure analysis, provide valuable insights into ion storage mechanisms.
- This study offers a pathway to quantify alkali metal intercalation in hard carbon using Raman spectroscopy, aiding in material design.
