Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 9, Pages 9507-9512Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01678
Keywords
printed electrode; aerosol jet; battery; LIB; porosity; tortuosity
Funding
- NRC Research Associateship Program
- University of Dayton Research Institute
- AFRL/RQQE Wright-Patterson Air Force Base
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The electrochemical performance of AJ-printed lithium iron phosphate cathodes were compared with TC cathodes, showing that the former had higher discharge capacities due to larger electrochemically active surface area and a unique bimodal pore network structure.
The electrochemical performance of an aerosol jet (AJ)-printed lithium iron phosphate cathode versus an equivalent tape-cast (TC) cathode was evaluated. Rate capability and long-term cell testing demonstrated that at similar mass loadings and thicknesses, the AJ-printed cathodes achieved higher discharge capacities than the TC cathodes. Electron microscopy and X-ray tomography showed a bimodal pore network for the AJ-printed cathode; larger Li-ion-conducting channels were visible at the electrode surface, while a denser cathode structure (akin to a TC cathode) was present near the current collector. Electrochemical impedance calculations revealed that this bimodal pore distribution endowed AJ-printed cathodes with approximately 30% more electrochemically active surface area than their TC cathode counterparts.
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