Journal
ADVANCED MATERIALS TECHNOLOGIES
Volume 2, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/admt.201700106
Keywords
electrode fabrication; lithium-ion batteries; long life; solvent-free; thick electrode
Categories
Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0014435]
- Big-Data Private-Cloud Research Cyberinfrastructure MRI-award - NSF [CNS-1338099]
- Rice University
- DOE Office of Science [DE-AC02-06CH11357]
- National Synchrotron Light Source II, Brookhaven National Laboratory, under DOE [DE-SC0012704]
- [NSFCMMI-1462343]
- [CMMI-1462321]
- [IIP-1640647]
- U.S. Department of Energy (DOE) [DE-SC0014435] Funding Source: U.S. Department of Energy (DOE)
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1462321] Funding Source: National Science Foundation
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Slurry casting method dominates the electrode manufacture of lithium-ion batteries. The entire procedure is similar to the newspaper printing that includes premixing of cast materials into solvents homogeneously, and continuously transferring and drying the slurry mixture onto the current collector. As a market approaching US $80 billion by 2024, the optimization of manufacture process is crucial and attractive. However, the organic solvent remains irreplaceable in the wet method for making slurries, even though it is capital-intensive and toxic. Here, an advanced powder printing technique is demonstrated that is completely solvent-free and dry. Through removing the solvent and related procedures, this method is anticipated to statistically save 20% of the cost at a remarkably shortened production cycle (from hours to minutes). The dry printed electrodes outperform commercial slurry cast ones in 650 cycles (80% capacity retention in 500 cycles), and thick electrodes are successfully fabricated to increase the energy density. Furthermore, microscopy techniques are utilized to characterize the difference of electrode microstructure between dry and wet methods, and distinguish dry printing's advantages on controlling the microstructure. In summary, this study proves a practical fabrication method for lithium-ion electrodes with lowered cost and favorable performance, and allows more advanced electrode designs potentially.
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