Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery
A binder plays a critical role in dispersion of coating liquids and the quality of coating. Poly(vinylidene fluoride) (PVDF) is widely used as a binder in cathode slurries; however, its role as a binder is still under debate. In this paper, we study the role of PVDF on the rheology of cathode batter...
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2020-10-01
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| author | Sang Hoon Sung Sunhyung Kim Jeong Hoon Park Jun Dong Park Kyung Hyun Ahn |
| author_facet | Sang Hoon Sung Sunhyung Kim Jeong Hoon Park Jun Dong Park Kyung Hyun Ahn |
| author_sort | Sang Hoon Sung |
| collection | DOAJ |
| description | A binder plays a critical role in dispersion of coating liquids and the quality of coating. Poly(vinylidene fluoride) (PVDF) is widely used as a binder in cathode slurries; however, its role as a binder is still under debate. In this paper, we study the role of PVDF on the rheology of cathode battery slurries consisting of Li(Ni<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>)O<sub>2</sub> (NCM), carbon black (CB) and N-methyl-2-pyrrolidone (NMP). Rheology and microstructure of cathode slurries are systemically investigated with three model suspensions: CB/PVDF/NMP, NCM/PVDF/NMP and NCM/CB/PVDF/NMP. To highlight the role of PVDF in cathode slurries, we prepare the same model suspensions by replacing PVDF with PVP, and we compare the role of PVDF to PVP in the suspension rheology. We find that PVDF adsorbs neither onto NCM nor CB surface, which can be attributed to its poor affinity to NCM and CB. Rheological measurements suggest that PVDF mainly increases matrix viscosity in the suspension without affecting the microstructure formed by CB and NCM particles. In contrast to PVDF, PVP stabilizes the structure of CB and NCM in the model suspensions, as it is adsorbed on the CB surface. This study will provide a useful insight to fundamentally understand the rheology of cathode slurries. |
| first_indexed | 2024-03-10T15:40:20Z |
| format | Article |
| id | doaj.art-477b4b209f274a519e2319f45d592004 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T15:40:20Z |
| publishDate | 2020-10-01 |
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| spelling | doaj.art-477b4b209f274a519e2319f45d5920042023-11-20T16:53:48ZengMDPI AGMaterials1996-19442020-10-011320454410.3390/ma13204544Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion BatterySang Hoon Sung0Sunhyung Kim1Jeong Hoon Park2Jun Dong Park3Kyung Hyun Ahn4School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, KoreaInstitute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Gotthard-Franz-Straße 3, 76131 Karlsruhe, GermanySchool of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, KoreaDepartment of Chemical and Biological Engineering, Sookmyung Women’s University, Cheongpa-ro 47-gil 100, Yongsan-gu, Seoul 04310, KoreaSchool of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, KoreaA binder plays a critical role in dispersion of coating liquids and the quality of coating. Poly(vinylidene fluoride) (PVDF) is widely used as a binder in cathode slurries; however, its role as a binder is still under debate. In this paper, we study the role of PVDF on the rheology of cathode battery slurries consisting of Li(Ni<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>)O<sub>2</sub> (NCM), carbon black (CB) and N-methyl-2-pyrrolidone (NMP). Rheology and microstructure of cathode slurries are systemically investigated with three model suspensions: CB/PVDF/NMP, NCM/PVDF/NMP and NCM/CB/PVDF/NMP. To highlight the role of PVDF in cathode slurries, we prepare the same model suspensions by replacing PVDF with PVP, and we compare the role of PVDF to PVP in the suspension rheology. We find that PVDF adsorbs neither onto NCM nor CB surface, which can be attributed to its poor affinity to NCM and CB. Rheological measurements suggest that PVDF mainly increases matrix viscosity in the suspension without affecting the microstructure formed by CB and NCM particles. In contrast to PVDF, PVP stabilizes the structure of CB and NCM in the model suspensions, as it is adsorbed on the CB surface. This study will provide a useful insight to fundamentally understand the rheology of cathode slurries.https://www.mdpi.com/1996-1944/13/20/4544NCMcathode slurryPVDFrheologymicrostructure |
| spellingShingle | Sang Hoon Sung Sunhyung Kim Jeong Hoon Park Jun Dong Park Kyung Hyun Ahn Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery Materials NCM cathode slurry PVDF rheology microstructure |
| title | Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery |
| title_full | Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery |
| title_fullStr | Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery |
| title_full_unstemmed | Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery |
| title_short | Role of PVDF in Rheology and Microstructure of NCM Cathode Slurries for Lithium-Ion Battery |
| title_sort | role of pvdf in rheology and microstructure of ncm cathode slurries for lithium ion battery |
| topic | NCM cathode slurry PVDF rheology microstructure |
| url | https://www.mdpi.com/1996-1944/13/20/4544 |
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