Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 40, Pages 26895-26901Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09757
Keywords
Li metal batteries; graphene islands; dendrites; nucleation seeds; lateral growth
Funding
- Industrial Technology Innovation Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20152020104730, 20152020104870]
- Ministry of Trade, Industry & Energy (MOTIE), Republic of Korea
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2015R1A5A7037615]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20152020104870, 20152020104730] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Li metal batteries such as Li air and Li-S systems have increasingly attracted the attention of researchers because of their high energy densities, which are enhanced by the use of Li metal negative electrodes. However, poor cycle efficiency and safety concerns, which are mainly related to. dendrite Li growth during cycling, need to,be addressed. Here we propose a solution to the Li dendrite problems. We distributed chemically prepared nitrogen-doped few-layer graphene (N-FLG) sheets on Cu substrates to create island structures. The island-type FLG on the Cu electrode was prepared via spin-coating using slurries that included a polymer binder. When the electrode was used for Li deposition, Li ions were first inserted into the graphene layers. Then, Li metal nucleation occurred at the N-FLG sheets owing to their high electrical conductivity; meanwhile, an insulating polymer layer on the Cu prevented the growth of metallic Li there. Lastly, Li metal grew from the edges of N-FLG sheets in both the lateral and vertical direction, and Li metal deposits filled the gaps between the N-FLG islands as well as covering the remainder of the electrode surface. Thus, stable cycling with flat voltage profiles was demonstrated over 100 cycles at a current density of 2 mA cm(-2). The materials and electrochemical characterization results highlight the effectiveness of this method, which paves the way for the development of robust, dendrite-free Li metal electrodes.
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