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Dry Process for Fabricating Low Cost and High Performance Electrode for Energy Storage Devices

Published online by Cambridge University Press:  16 January 2019

Qiang Wu
Affiliation:
Department of Electrical and Computer Engineering, Florida A&M University and Florida State University, Tallahassee, FL32310, USA
Jim P. Zheng
Affiliation:
Department of Electrical and Computer Engineering, Florida A&M University and Florida State University, Tallahassee, FL32310, USA
Mary Hendrickson
Affiliation:
Army Power Division, RDER-CCA, 5100 Magazine Road, Aberdeen Proving Ground, MD21005, USA
Edward J. Plichta
Affiliation:
Army Power Division, RDER-CCA, 5100 Magazine Road, Aberdeen Proving Ground, MD21005, USA
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Abstract

We report a roll-to-roll dry processing for making low cost and high performance electrodes for lithium-ion batteries (LIBs). Currently, the electrodes for LIBs are made with a slurry casting procedure (wet method). The dry electrode fabrication is a three-step process including: step 1 of uniformly mixing electrode materials powders comprising an active material, a carbonaceous conductor and the soft polymer binder; step 2 of forming a free-standing, continuous electrode film by pressing the mixed powders together through the gap between two rolls of a roll-mill; and step 3 of roll-to-roll laminating the electrode film onto a substrate such as a current collector. Compared with the conventional wet slurry electrode manufacturing method, the dry manufactural procedure and infrastructure are simpler, the production cost is lower, and the process eliminates volatile organic compound emission and is more environmentally friendly, and the ability of making thick (>120µm) electrodes with high tap density results in high energy density of final energy storage device. A prototype LIBs of LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite also has 230 Wh/ kg energy density.

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Copyright
Copyright © Materials Research Society 2019 

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Wu et al. supplementary material

Wu et al. supplementary material 1

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