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Suitable Cathode NMP Replacement for Efficient Sustainable Printed Li-Ion Batteries.
Rafal Sliz1, Juho Valikangas2, Hellen Silva Santos3
1Optoelectronics and Measurement Techniques Unit, University of Oulu, 90570 Oulu, Finland.
ACS Applied Energy Materials
|May 2, 2022
Summary
Dimethylformamide (DMF) can replace N-methyl-2-pyrrolidone (NMP) in battery cathode manufacturing, reducing energy use and environmental impact. This solvent switch maintains battery performance, showing promise for greener battery production.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- N-methyl-2-pyrrolidone (NMP) is the standard solvent for battery cathode manufacturing but faces environmental restrictions.
- Dimethylformamide (DMF) is a viable alternative due to its favorable physical properties and potential for reduced energy consumption.
Purpose of the Study:
- To evaluate dimethylformamide (DMF) as a sustainable replacement for N-methyl-2-pyrrolidone (NMP) in lithium-ion battery cathode fabrication.
- To assess the impact of DMF on electrode properties, manufacturing processes, and overall battery performance.
Main Methods:
- Screen printing was employed for cathode fabrication using both NMP and DMF solvents with NMC523 and high-capacity NMC88 chemistries.
- Fabricated coin and pouch cell batteries were subjected to 1000 charge-discharge cycles to evaluate long-term performance.
- Drying energy consumption was modeled to quantify the environmental benefits of using DMF.
Main Results:
- Screen-printed NMC cathodes using DMF demonstrated comparable performance to NMP-based cathodes.
- Batteries fabricated with DMF retained 87% (NMC523) and 90% (NMC88) of their capacity after 1000 cycles.
- Modeling indicated a fourfold reduction in drying energy consumption with DMF, highlighting significant environmental and economic advantages.
Conclusions:
- Dimethylformamide (DMF) is a suitable and sustainable solvent for N-methyl-2-pyrrolidone (NMP) replacement in NMC battery cathode manufacturing.
- The use of DMF offers reduced energy consumption and improved safety, contributing to more environmentally friendly battery production without compromising performance.
