Impact of pore tortuosity on electrode kinetics in lithium battery electrodes: Study in directionally freeze-cast LiNi0.8Co0.15Al0.05O2 (NCA)
| العنوان: | Impact of pore tortuosity on electrode kinetics in lithium battery electrodes: Study in directionally freeze-cast LiNi0.8Co0.15Al0.05O2 (NCA) |
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| المؤلفون: | Delattre, Benjamin, Amin, Ruhul, Sander, Jonathan, De Coninck, Joel, Tomsia, Antoni P, Chiang, Yet-Ming |
| المصدر: | Journal of the Electrochemical Society, vol 165, iss 2 Journal of The Electrochemical Society, vol 165, iss 2 Delattre, Benjamin; Amin, Ruhul; Sander, Jonathan; De Coninck, Joel; Tomsia, Antoni P; & Chiang, Yet-Ming. (2018). Impact of Pore Tortuosity on Electrode Kinetics in Lithium Battery Electrodes: Study in Directionally Freeze-Cast LiNi0.8Co0.15Al0.05O2 (NCA). JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 165(2), A388-A395. doi: 10.1149/2.1321802jes. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/2ct8s3mzTest |
| بيانات النشر: | eScholarship, University of California, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Energy, Affordable and Clean Energy, Materials Engineering, Macromolecular And Materials Chemistry, Physical Chemistry, Physical Chemistry (incl. Structural) |
| الوصف: | The prevailing electrode fabrication method for lithium-ion battery electrodes includes calendering at high pressures to densify the electrode and promote adhesion to the metal current collector. However, this process increases the tortuosity of the pore network in the primary transport direction and imposes severe tradeoffs between electrode thickness and rate capability. With the aim of understanding the impact of pore tortuosity on electrode kinetics, and enabling cell designs with thicker electrodes and improved cost and energy density, we use here freeze-casting, a shaping technique able to produce low-tortuosity structures using ice crystals as a pore-forming agent, to fabricate LiNi0.8Co0.15Al0.05O2 (NCA) cathodes with controlled, aligned porosity. Electrode tortuosity is characterized using two complementary methods, X-ray tomography combined with thermal diffusion simulations, and electrochemical transport measurements. The results allow comparison across a wide range of microstructures, and highlight the large impact of a relatively small numerical change in tortuosity on electrode kinetics. Under galvanostatic discharge, optimized microstructures show a three- to fourfold increase in area-specific capacity compared to typical Li-ion composite electrodes. Hybrid pulse power characterization (HPPC) demonstrates improved power capability, while dynamic stress tests (DST) shows that an area-specific area capacity corresponding to 91% of the NCA galvanostatic C/10 capacity could be reached. |
| وصف الملف: | application/pdf |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::454bfc587bb914b9a59057745942de01Test https://escholarship.org/uc/item/2ct8s3mzTest |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.dedup.wf.001..454bfc587bb914b9a59057745942de01 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |