Chen Z, Li L, Zhang Z, Li H, Xie B, Chen Y, Davoodi A, Hosseinpour S, Liu W (2021)
Publication Language: English
Publication Type: Journal article
Publication year: 2021
DOI: 10.1016/j.carbon.2021.07.097
Pulverization and surface instability has been identified as the main impediments to the application of Si anodes in high-energy lithium-ion batteries (LIBs). In this study, a Si-graphitic carbon hybrid (SiG) is created via embedding Si nanoparticles in between expanding graphite interlayers, thus to be adopted as a model system to unravel structure-properties relations for LIBs applications. We explore the impact of artificial surface coating layers on the lithium cycling performance of SiG particles. In comparison with native SiG and carbon-coated SiG (CC-SiG), we find that the “sticky-carbon” coating, i.e., an epoxy-rich layer on top of the carbon coating, gave rise to superior cycle performance. In the “sticky carbon” coated SiG (SCC-SiG), the surface chemistry appears to have a pivotal role in both alleviating electrode disintegration and forming a favorable SEI rich in fluorine-polymers. These positive findings are examined in electrodes with mass loading ranging from 1.0 to 5.0 mg/cm2, achieving area capacities up to ~5.0 mAh/cm2. A full cell adopting >6 mg/cm2 LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode and SCC-SiG delivers stable cycling performances. It is hence unraveled that the carbon coating layer with reactive surface groups on the top is an unrecognized key for various Si anodes.
APA:
Chen, Z., Li, L., Zhang, Z., Li, H., Xie, B., Chen, Y.,... Liu, W. (2021). “Sticky” carbon coating enables high-area-capacity lithium storage of silicon-graphitic carbon hybrid. Carbon. https://dx.doi.org/10.1016/j.carbon.2021.07.097
MLA:
Chen, Zidong, et al. "“Sticky” carbon coating enables high-area-capacity lithium storage of silicon-graphitic carbon hybrid." Carbon (2021).
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