Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7230
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Funding
- Boulder Ionics Corporation through the Membrane Science, Engineering and Technology (MAST) Center at CU-Boulder
- NSF Industry-University Cooperative Research Center
- National Science Foundation [IIP-1152040]
- National Science Foundation (NSF) [CHE-1231048]
- Fundamental R&D Program for Technology of World Premier Materials
- Ministry of Knowledge Economy, Republic of Korea [10037919]
- Research Institute of Advanced Materials (RIAM)
- Army Research Office [W911NF-11-1-0432]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1231048] Funding Source: National Science Foundation
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We are currently in the midst of a race to discover and develop new battery materials capable of providing high energy-density at low cost. By combining a high-performance Si electrode architecture with a room temperature ionic liquid electrolyte, here we demonstrate a highly energy-dense lithium-ion cell with an impressively long cycling life, maintaining over 75% capacity after 500 cycles. Such high performance is enabled by a stable half-cell coulombic efficiency of 99.97%, averaged over the first 200 cycles. Equally as significant, our detailed characterization elucidates the previously convoluted mechanisms of the solid-electrolyte interphase on Si electrodes. We provide a theoretical simulation to model the interface and microstructural-compositional analyses that confirm our theoretical predictions and allow us to visualize the precise location and constitution of various interfacial components. This work provides new science related to the interfacial stability of Si-based materials while granting positive exposure to ionic liquid electrochemistry.
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