Abstract
Conventional lithium-ion battery (LIB) electrodes are prepared through a wet slurry process with n-methyl pyrrolidone solvent, especially for cathodes. The wet slurry process encounters several disadvantages such as binder migration, electrode cracking in thick electrodes, energy intense heat-dry NMP solvent removal, and costly NMP recovery. The cost and energy consumption of coating and drying of electrode are about 11.5 % and >46 % in LIB manufacturing, respectively. Thereby, it is essential to develop a facile roll-to-roll solvent-free LIB electrode processing for reducing the cost and energy consumption. Recently, the Maxwell-type dry processing (DP) shines new lights on LIB manufacturing, which mainly bases on dry mixing (DM) of electrode component powder followed by calendering into electrode films and laminating onto current collectors, realizing the rapid manufacturing of LIB electrodes in a powder-to-film manner for industries. This report shares some recent progress on the DP from our group. We aim to further advance the manufacturing science of DP by correlating the processing conditions with electrode properties and performance. Particularly, we investigate the effect of DM, and compression on the polytetrafluoroethylene (PTFE) binder fiberization, porosity, mechanical properties, electrical conductivity and electrochemical behaviors of electrodes. The DM study suggests that PTFE fiberization heavily relies on the degree of DM. Insufficient DM results in poor PTFE fiberization while outrageous DM damages the formed PTFE fibers. Both negatively affect the mechanical behaviors of the electrodes and their rate capability. However, moderate DM is highly beneficial. In addition, our study of the porosity impact reveals that LiNi0.8Mn0.1Co0.1O2 (NMC) secondary particles can be broken into primary particles due to compression, especially at low porosity. Those fractured NMC secondary particles exhibit lower modulus. We propose that a moderate porosity of around 32% favors the electronic conductivity, charge transfer impedance and rate capability. The study of the cathodic electrolyte interphase layer of PTFE-based DPed electrode confirms that side reactions of PTFE binder due to the formation of LiF in LiClO4-based electrolyte.
Original language | English |
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Title of host publication | Manufacturing Equipment and Automation; Manufacturing Processes; Manufacturing Systems; Nano/Micro/Meso Manufacturing; Quality and Reliability |
ISBN (Electronic) | 9780791888117 |
DOIs | |
State | Published - 2024 |
Event | ASME 2024 19th International Manufacturing Science and Engineering Conference, MSEC 2024 - Knoxville, United States Duration: Jun 17 2024 → Jun 21 2024 |
Publication series
Name | Proceedings of ASME 2024 19th International Manufacturing Science and Engineering Conference, MSEC 2024 |
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Volume | 2 |
Conference
Conference | ASME 2024 19th International Manufacturing Science and Engineering Conference, MSEC 2024 |
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Country/Territory | United States |
City | Knoxville |
Period | 6/17/24 → 6/21/24 |
Bibliographical note
Publisher Copyright:Copyright © 2024 by Argonne National Laboratory and The United States Government.
Keywords
- Dry mixing
- Dry processing
- Energy density
- Lithium-ion batteries
- Porosity
- Sustainable manufacturing
ASJC Scopus subject areas
- Industrial and Manufacturing Engineering