Please use this identifier to cite or link to this item: https://doi.org/10.1021/acs.jpcc.5b12551
Title: In Situ Raman and Nuclear Magnetic Resonance Study of Trapped Lithium in the Solid Electrolyte Interface of Reduced Graphene Oxide
Authors: Tang, Wei 
Goh, Bee-Min 
Hu, Mary Y
Wan, Chuan
Tian, Bingbing 
Deng, Xuchu
Peng, Chengxin 
Lin, Ming
Hu, Jian Zhi
Loh, Kian Ping 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
PERFORMANCE ANODE MATERIALS
ENERGY-STORAGE
ION BATTERIES
LI-7 NMR
HIGH-CAPACITY
SINGLE-LAYER
HIGH-POWER
GRAPHITE
SHEETS
INTERCALATION
Issue Date: 11-Feb-2016
Publisher: AMERICAN CHEMICAL SOCIETY
Citation: Tang, Wei, Goh, Bee-Min, Hu, Mary Y, Wan, Chuan, Tian, Bingbing, Deng, Xuchu, Peng, Chengxin, Lin, Ming, Hu, Jian Zhi, Loh, Kian Ping (2016-02-11). In Situ Raman and Nuclear Magnetic Resonance Study of Trapped Lithium in the Solid Electrolyte Interface of Reduced Graphene Oxide. JOURNAL OF PHYSICAL CHEMISTRY C 120 (5) : 2600-2608. ScholarBank@NUS Repository. https://doi.org/10.1021/acs.jpcc.5b12551
Abstract: © 2016 American Chemical Society. Motivated by its high surface area and electrical conductivity, reduced graphene oxide (rGO) flakes have been intensively studied as potential anode materials for lithium ion battery (LIB). The high capacity in rGO (600-1000 mA h g-1) compared to graphite (372 mA h g-1) suggest that a different lithiation mechanism may be operational in the former. The high capacity of rGO should be attributed to its high surface area and associated defective sites, however, these may act as trapping sites and undergo side reactions with the solvent and lithium ions to form the solid electrolyte interphase (SEI) upon lithiation, resulting in irreversible capacity loss (ICL) during the initial cycles. Elucidating the temporal evolution of SEI layer on rGO and quantifying the amount of trapped lithium will be useful in developing strategies to mitigate the ICL process. Herein, the Li intercalation mechanism in rGO and graphite was investigated using in situ Raman spectroscopy and in situ time-resolved nuclear magnetic resonance (NMR) to provide insights into the origins of the high capacity and ICL loss in rGO. Finally, the dynamic and static SEI passive layer formed on rGO flakes was monitored, and a method was developed to quantify the amount of Li+ trapped in the SEI layer.
Source Title: JOURNAL OF PHYSICAL CHEMISTRY C
URI: https://scholarbank.nus.edu.sg/handle/10635/171190
ISSN: 19327447
19327455
DOI: 10.1021/acs.jpcc.5b12551
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