“Sticky” carbon coating enables high-area-capacity lithium storage of silicon-graphitic carbon hybrid

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

Journal

Carbon Elsevier

DOI: 10.1016/j.carbon.2021.07.097

Abstract

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.

Authors with CRIS profile

Saman Hosseinpour Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Involved external institutions

Sichuan University (SCU) / 四川大学 CN China (CN) Ferdowsi University of Mashhad IR Iran, Islamic Republic of (IR) Chengdu Silan Semiconductor Manufacturing Company, LTD CN China (CN)

How to cite

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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