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Compositional Engineering to Tailor Pseudographitic Microstructure of Hard Carbon for Enhanced Sodium Storage
Yueying Li1, Yuyang Gao2, Fengxuan Wu2
1School of Energy and Electrical Engineering, Qinghai University, Xining, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 18, 2026
Summary
Researchers engineered biomass-derived hard carbons for sodium-ion batteries using a deep eutectic solvent. This method enhances sodium storage capacity and efficiency, paving the way for advanced battery technologies.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Biomass-derived hard carbons are promising anode materials for sodium-ion batteries due to their low cost and tunable properties.
- Challenges exist in precisely controlling the carbon microstructure for optimal sodium storage performance.
Purpose of the Study:
- To develop a compositional engineering strategy for tailoring the pseudographitic structure of biomass-based hard carbons.
- To enhance the sodium-ion storage performance of hard carbons derived from cotton.
Main Methods:
- Utilized a deep eutectic solvent to selectively dissolve low-crystalline components of biomass.
- Leveraged remaining crystalline cellulose to form desired pseudo-graphitic domains with expanded interlayer spacing and pores.
Main Results:
- Achieved an enhanced capacity of 318 mAh g-1 at 20 mA g-1 for cotton-derived hard carbon.
- Reported an impressive initial Coulombic efficiency of 85%.
- Demonstrated good sodium storage performance at low temperatures and in full cells.
Conclusions:
- The developed strategy offers an eco-friendly and effective method for fabricating high-performance biomass-based hard carbons.
- This approach accelerates the development of advanced sodium-ion battery technology.
