Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 15, Pages 21182-21194Publisher
WILEY
DOI: 10.1002/er.7171
Keywords
aqueous processing; crack-free coating; electrode manufacturing; lithium-ion batteries
Categories
Funding
- Presidency of Strategy and Budget [2014K121080]
- TUBITAK [118C307]
- Scientific and Technological Research Council of Turkey
Ask authors/readers for more resources
This study demonstrates that using water-based slurry and a CMC-PEO binder mixture for preparing NMC cathode electrodes can achieve better cycling stability and mass loading. Multi-layer coating technique helps to mitigate particle cracking during electrode drying and allows for higher mass loading. The water-based electrode preparation method is validated through pilot-scale roll-to-roll production line testing.
Aqueous-based slurry media for cathode electrode production offers a cleaner and safer environment during the electrode manufacturing step compared with the conventional organic solvent-based method used in the lithium-ion battery industry. In this work, carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), and poly(ethylene oxide) (PEO) water-based binders are used to prepare LiNi0.5Mn0.3Co0.2O2 (NMC) cathode electrode. Detail electrochemical analysis reveals that the optimum mass ratio of CMC:SBR mixture is 1:2 when preparing an aqueous slurry for the NMC electrode. To mitigate particle cracking phenomenon during electrode drying step and obtain higher mass loading, a multi-layer coating technique is implemented. CMC-PEO binder mixture in aqueous media is also studied as an alternative aqueous processing method for NMC electrodes. The electrodes prepared with CMC-PEO mixture are demonstrated to be all crack-free, and electrochemical results indicate that the optimum mass loading of NMC electrode is between 15 and 18 mg cm(-2). This method is further tested in pouch cell format using a roll-to-roll pilot-scale production line to show the feasibility for commercial applications. Remarkably, pouch cell results manifest that aqueous-processed NMC cathode against graphite anode maintains its 89% capacity at 1C even after 1000 cycles. Highlights Water-based binders of carboxymethyl cellulose-poly(ethylene oxide) provide excellent cycling stability for LiNi0.5Mn0.3Co0.2O2 electrode. Multilayer coating allows electrodes for higher loadings without any crack formation. The water-based electrode preparation method is validated by pilot scale roll-to-roll electrode production line.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available