Al2O3 Ceramic/Nanocellulose-Coated Non-Woven Separator for Lithium-Metal Batteriesopen access
- Authors
- Shin, Dong-Min; Son, Hyunsu; Park, Ko Un; Choi, Junyoung; Suk, Jungdon; Kang, Eun Seck; Kim, Dong-Won; Kim, Do Youb
- Issue Date
- May-2023
- Publisher
- MDPI
- Keywords
- nanocellulose; Al2O3; lithium-metal battery; safety; stability
- Citation
- COATINGS, v.13, no.5, pp.1 - 16
- Indexed
- SCIE
SCOPUS
- Journal Title
- COATINGS
- Volume
- 13
- Number
- 5
- Start Page
- 1
- End Page
- 16
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/186344
- DOI
- 10.3390/coatings13050916
- Abstract
- Separators play an essential role in lithium (Li)-based secondary batteries by preventing direct contact between the two electrodes and providing conduction pathways for Li-ions in the battery cells. However, conventional polyolefin separators exhibit insufficient electrolyte wettability and thermal stability, and in particular, they are vulnerable to Li dendritic growth, which is a significant weakness in Li-metal batteries (LMBs). To improve the safety and electrochemical performance of LMBs, Al2O3 nanoparticles and nanocellulose (NC)-coated non-woven poly(vinylidene fluoride)/polyacrylonitrile separators were fabricated using a simple, water-based blade coating method. The Al2O3/NC-coated separator possessed a reasonably porous structure and a significant number of hydroxyl groups (-OH), which enhanced electrolyte uptake (394.8%) and ionic conductivity (1.493 mS/cm). The coated separator also exhibited reduced thermal shrinkage and alleviated uncontrollable Li dendritic growth compared with a bare separator. Consequently, Li-metal battery cells with a LiNi0.8Co0.1Mn0.1O2 cathode and an Al2O3/NC-coated separator using either liquid or solid polymer electrolytes exhibited improved rate capability, cycle stability, and safety compared with a cell with a bare separator. The present study demonstrates that combining appropriate materials in coatings on separator surfaces can enhance the safety and electrochemical performance of LMBs.
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