Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries
Lithium-ion batteries have led the revolution in portable electronic devices and electrical vehicles due to their high gravimetric energy density. In particular, layered cathode material Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub>...
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MDPI AG
2021-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/7/1840 |
| _version_ | 1797526487399661568 |
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| author | Penghui Zhu Jiahao Han Wilhelm Pfleging |
| author_facet | Penghui Zhu Jiahao Han Wilhelm Pfleging |
| author_sort | Penghui Zhu |
| collection | DOAJ |
| description | Lithium-ion batteries have led the revolution in portable electronic devices and electrical vehicles due to their high gravimetric energy density. In particular, layered cathode material Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> (NMC 622) can deliver high specific capacities of about 180 mAh/g. However, traditional cathode manufacturing involves high processing costs and environmental issues due to the use of organic binder polyvinylidenfluoride (PVDF) and highly toxic solvent <i>N</i>-methyl-pyrrolidone (NMP). In order to overcome these drawbacks, aqueous processing of thick-film NMC 622 cathodes was studied using carboxymethyl cellulose and fluorine acrylic hybrid latex as binders. Acetic acid was added during the mixing process to obtain slurries with pH values varying from 7.4 to 12.1. The electrode films could be produced with high homogeneity using slurries with pH values smaller than 10. Cyclic voltammetry measurements showed that the addition of acetic acid did not affect the redox reaction of active material during charging and discharging. Rate capability tests revealed that the specific capacities with higher slurry pH values were increased at C-rates above C/5. Cells with laser structured thick-film electrodes showed an increase in capacity by 40 mAh/g in comparison to cells with unstructured electrodes. |
| first_indexed | 2024-03-10T09:29:57Z |
| format | Article |
| id | doaj.art-e039ea014e294e91bd18f8f598d24896 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T09:29:57Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-e039ea014e294e91bd18f8f598d248962023-11-22T04:34:45ZengMDPI AGNanomaterials2079-49912021-07-01117184010.3390/nano11071840Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion BatteriesPenghui Zhu0Jiahao Han1Wilhelm Pfleging2Institute for Applied Materials-Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyInstitute for Applied Materials-Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyInstitute for Applied Materials-Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyLithium-ion batteries have led the revolution in portable electronic devices and electrical vehicles due to their high gravimetric energy density. In particular, layered cathode material Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> (NMC 622) can deliver high specific capacities of about 180 mAh/g. However, traditional cathode manufacturing involves high processing costs and environmental issues due to the use of organic binder polyvinylidenfluoride (PVDF) and highly toxic solvent <i>N</i>-methyl-pyrrolidone (NMP). In order to overcome these drawbacks, aqueous processing of thick-film NMC 622 cathodes was studied using carboxymethyl cellulose and fluorine acrylic hybrid latex as binders. Acetic acid was added during the mixing process to obtain slurries with pH values varying from 7.4 to 12.1. The electrode films could be produced with high homogeneity using slurries with pH values smaller than 10. Cyclic voltammetry measurements showed that the addition of acetic acid did not affect the redox reaction of active material during charging and discharging. Rate capability tests revealed that the specific capacities with higher slurry pH values were increased at C-rates above C/5. Cells with laser structured thick-film electrodes showed an increase in capacity by 40 mAh/g in comparison to cells with unstructured electrodes.https://www.mdpi.com/2079-4991/11/7/1840lithium-ion batteriesNMC 622aqueous processingthick-film electrodelaser structuringcyclic voltammetry |
| spellingShingle | Penghui Zhu Jiahao Han Wilhelm Pfleging Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries Nanomaterials lithium-ion batteries NMC 622 aqueous processing thick-film electrode laser structuring cyclic voltammetry |
| title | Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries |
| title_full | Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries |
| title_fullStr | Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries |
| title_full_unstemmed | Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries |
| title_short | Characterization and Laser Structuring of Aqueous Processed Li(Ni<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>)O<sub>2</sub> Thick-Film Cathodes for Lithium-Ion Batteries |
| title_sort | characterization and laser structuring of aqueous processed li ni sub 0 6 sub mn sub 0 2 sub co sub 0 2 sub o sub 2 sub thick film cathodes for lithium ion batteries |
| topic | lithium-ion batteries NMC 622 aqueous processing thick-film electrode laser structuring cyclic voltammetry |
| url | https://www.mdpi.com/2079-4991/11/7/1840 |
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