Journal
SCIENCE
Volume 330, Issue 6010, Pages 1515-1520Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1195628
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Funding
- Sandia National Laboratories (SNL)
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) [DESC0001160]
- DOE's National Nuclear Security Administration [DE-AC04-94AL85000]
- DOE Office of Science, Offices of Biological and Environmental Research
- DOE's Office of Biological and Environmental Research at Pacific Northwest National Laboratory [DE-AC05-76RLO1830]
- Honda Research Institute USA
- Xi'an Jiaotong University
- NSF [CMMI-0728069, DMR-1008104, DMR-0520020]
- Air Force Office of Scientific Research [FA9550-08-1-0325]
- NSF through the University of Pittsburgh [CMMI0825842, CMMI0928517]
- NSF through SNL [CMMI0825842, CMMI0928517]
- Chinese Scholarship Council
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0825842] Funding Source: National Science Foundation
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We report the creation of a nanoscale electrochemical device inside a transmission electron microscope-consisting of a single tin dioxide (SnO2) nanowire anode, an ionic liquid electrolyte, and a bulk lithium cobalt dioxide (LiCoO2) cathode-and the in situ observation of the lithiation of the SnO2 nanowire during electrochemical charging. Upon charging, a reaction front propagated progressively along the nanowire, causing the nanowire to swell, elongate, and spiral. The reaction front is a Medusa zone containing a high density of mobile dislocations, which are continuously nucleated and absorbed at the moving front. This dislocation cloud indicates large in-plane misfit stresses and is a structural precursor to electrochemically driven solid-state amorphization. Because lithiation-induced volume expansion, plasticity, and pulverization of electrode materials are the major mechanical effects that plague the performance and lifetime of high-capacity anodes in lithium-ion batteries, our observations provide important mechanistic insight for the design of advanced batteries.
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