Improved Functionality of Lithium‐Ion Batteries Enabled by Atomic Layer Deposition on the Porous Microstructure of Polymer Separators and Coating Electrodes |
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| Authors: | Yoon Seok Jung Andrew S Cavanagh Lynn Gedvilas Nicodemus E Widjonarko Isaac D Scott Se‐Hee Lee Gi‐Heon Kim Steven M George Anne C Dillon |
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| Institution: | 1. National Renewable Energy Laboratory, Golden, CO 80401, USA;2. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689‐798, Republic of Korea;3. Department of Physics, University of Colorado at Boulder, Boulder, CO 80309‐0215, USA;4. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309‐0215, USA;5. Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, CO 80309‐0215, USA;6. Department of Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO 80309‐0215, USA |
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| Abstract: | Atomic layer deposition (ALD) of Al2O3 is applied on a polypropylene separator for lithium‐ion batteries. A thin Al2O3 layer (<10 nm) is coated on every surface of the porous polymer microframework without significantly increasing the total separator thickness. The thin Al2O3 ALD coating results in significantly suppressed thermal shrinkage, which may lead to improved safety of the batteries. More importantly, the wettability of Al2O3 ALD‐coated separators in an extremely polar electrolyte based on pure propylene carbonate (PC) solvent is demonstrated, without any decrease in electrochemical performances such as capacity, rate capability, and cycle life. Finally, a LiCoO2/natural graphite full cell is demonstrated under extremely severe conditions (pure PC‐based electrolyte and high (4.5 V) upper cut‐off potential), which is enabled by the Al2O3 ALD coating on all three components (cathode, anode, and separator). |
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| Keywords: | batteries surface modifications hybrid materials composite materials functional coatings |
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