High damage tolerance of electrochemically lithiated silicon
- Georgia Inst. of Technology, Atlanta, GA (United States). Woodruff School of Mechanical Engineering
- Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
- Univ. of Illinois, Urbana, IL (United States). Dept. of Aerospace Engineering
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Mechanical degradation and resultant capacity fade in high-capacity electrode materials critically hinder their use in high-performance rechargeable batteries. Despite tremendous efforts devoted to the study of the electro–chemo–mechanical behaviours of high-capacity electrode materials, their fracture properties and mechanisms remain largely unknown. In this paper, we report a nanomechanical study on the damage tolerance of electrochemically lithiated silicon. Our in situ transmission electron microscopy experiments reveal a striking contrast of brittle fracture in pristine silicon versus ductile tensile deformation in fully lithiated silicon. Quantitative fracture toughness measurements by nanoindentation show a rapid brittle-to-ductile transition of fracture as the lithium-to-silicon molar ratio is increased to above 1.5. Molecular dynamics simulations elucidate the mechanistic underpinnings of the brittle-to-ductile transition governed by atomic bonding and lithiation-induced toughening. Finally, our results reveal the high damage tolerance in amorphous lithium-rich silicon alloys and have important implications for the development of durable rechargeable batteries.
- Research Organization:
- Georgia Inst. of Technology, Atlanta, GA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- National Science Foundation (NSF) (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Contributing Organization:
- Univ. of Illinois, Urbana, IL (United States); Univ. of Pittsburgh, PA (United States)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1261096
- Alternate ID(s):
- OSTI ID: 1347348
- Report Number(s):
- SAND2015--5484J; ncomms9417
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Vol. 6; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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