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Title: | Constructive versus Destructive Heterogeneity in Porous Electrodes of Lithium-Ion Batteries | Authors: | YARI, Saeed HAMED, Hamid D'HAEN, Jan VAN BAEL, Marlies RENNER, Frank HARDY, An SAFARI, Momo |
Issue Date: | 2020 | Publisher: | AMER CHEMICAL SOC | Source: | ACS APPLIED ENERGY MATERIALS, 3 (12) , p. 11820 -11829 | Abstract: | We introduce an efficient framework for investigating the heterogeneity in the battery porous electrodes and its impacts on the performance and longevity of the lithium-ion batteries. A phenomenological picture based on theory and experiment is presented to show how the spatial variations in the local porosity and thickness in a porous electrode result from a microscopically inhomogeneous slurry. A series of analogous bilayer LiNi0.6Mn0.2Co0.2O2 porous electrodes with different levels of heterogeneity, induced by a non-uniform distribution of carbon, is prepared as a model experimental system and established as a powerful tool in formalizing the concept of heterogeneity. We identify and distinguish between the constructive and destructive heterogeneity as the two shades of non-uniformity in the porous electrodes. Depending on the degree of heterogeneity, we observe up to 20% decline in the rate performance of the electrodes. The destructive and constructive heterogeneity in the analogous electrodes are manifested in 5 fold increase and 2 fold decrease, respectively, in the aging rate of Li4Ti5O12|LiNi0.6Mn0.2Co0.2O2 cells relative to that of a cell with a homogenous electrode after 200 cycles at 1C. | Keywords: | Li-ion battery;NMC cathode;inhomogeneity;aging;bilayer electrode | Document URI: | http://hdl.handle.net/1942/33850 | ISSN: | 2574-0962 | DOI: | https://doi.org/10.1021/acsaem.0c01966 | ISI #: | 000618839200035 | Rights: | 2020 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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acsaem.0c01966.pdf Restricted Access | Published version | 3.39 MB | Adobe PDF | View/Open Request a copy |
Main - Final.pdf | Peer-reviewed author version | 1.14 MB | Adobe PDF | View/Open |
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