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Optimization of LiFePO4 nanoparticle suspensions with polyethyleneimine for aqueous processing
Jianlin Li1, Beth L Armstrong, Jim Kiggans
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6083, USA. Lij4@ornl.gov
Langmuir : the ACS Journal of Surfaces and Colloids
|February 2, 2012
Summary
Adding polyethyleneimine (PEI) to lithium-ion battery cathode formulations with LiFePO(4) creates stable suspensions for better electrode coatings. This improves lithium-ion battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Colloid Science
Background:
- Stable colloidal suspensions are crucial for high-quality lithium-ion battery electrode fabrication.
- Aqueous-based formulations for LiFePO(4) cathodes require effective dispersants for optimal processing.
Purpose of the Study:
- To investigate the colloidal chemistry of LiFePO(4) and Super P C45 using polyethyleneimine (PEI) as a dispersant.
- To optimize electrode formulations and coatings for LiFePO(4) active cathode material.
Main Methods:
- Determined the isoelectric points of LiFePO(4) (pH 4.3) and Super P C45 (pH 3.4).
- Evaluated polyethyleneimine (PEI) as a cationic surfactant dispersant.
- Assessed dispersion stability through viscosity, agglomerate size, and elemental distribution.
Main Results:
- PEI effectively disperses LiFePO(4) and Super P C45, with optimal concentrations of 1.0 wt% and 0.5 wt%, respectively.
- 1.5 wt% PEI in LiFePO(4) cathode suspensions yielded the best dispersibility.
- Improved component dispersion led to enhanced electrode quality and LiFePO(4) performance.
Conclusions:
- Polyethyleneimine (PEI) is a highly effective dispersant for aqueous LiFePO(4) cathode formulations.
- Optimized PEI concentrations enhance colloidal stability, coating deposition, and overall battery performance.
- This research provides critical insights for developing advanced lithium-ion battery electrodes.
