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Lithium Iron Phosphate/Carbon (LFP/C) Composite Using Nanocellulose as a Reducing Agent and Carbon Source
Macarena Kroff1, Samuel A Hevia2,3, James N O'Shea4
1Departamento de Química Inorgánica, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago 7820244, Chile.
Polymers
|June 28, 2023
Summary
Researchers developed a simple method to create lithium iron phosphate (LFP) and carbon composites for electric vehicles. Cellulose nanofibers (CNF) improved LFP/C material properties, offering a cost-effective and eco-friendly solution.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Lithium iron phosphate (LiFePO4, LFP) is a preferred cathode material for electric vehicles (EVs) due to its safety, stability, and cost-effectiveness.
- However, LFP materials exhibit poor electrical conductivity and ion diffusion, limiting their performance.
- Developing efficient LFP/carbon (LFP/C) composites is crucial for enhancing EV battery performance.
Purpose of the Study:
- To present a straightforward method for synthesizing LFP/C composites using nanocellulose (NC) as a carbon source.
- To investigate the influence of different nanocellulose types (cellulose nanocrystal - CNC, and cellulose nanofiber - CNF) on LFP composite properties.
- To optimize the synthesis for improved electrochemical performance of LFP/C materials.
Main Methods:
- Microwave-assisted hydrothermal synthesis was employed to produce LFP with nanocellulose.
- The synthesized material was subsequently heated under a nitrogen atmosphere to form the LFP/C composite.
- Different nanocellulose types (CNC and CNF) were used to assess their impact on the composite structure and performance.
Main Results:
- Nanocellulose acted as a reducing agent and stabilizer during synthesis, preventing particle agglomeration and reducing the need for additional chemicals.
- The LFP/C composite derived from CNF exhibited a more homogeneous carbon coating compared to CNC.
- The sample with 12.6% carbon from CNF demonstrated superior electrochemical performance due to its enhanced coating.
Conclusions:
- The utilization of cellulose nanofibers (CNF) provides a simple, rapid, and low-cost method for producing high-performance LFP/C composites.
- This approach avoids chemical waste, making it an environmentally friendly alternative for EV battery material synthesis.
- CNF-derived LFP/C composites show significant promise for advancing safe and efficient electric vehicle battery technology.
