Journal
ACS NANO
Volume 6, Issue 11, Pages 9425-9432Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn3037623
Keywords
constitutive law; battery cyclability; bending; apparent strain vs true strain; ideal strength
Categories
Funding
- Honda Research Institute
- NSF [DMR-1008104, DMR-1120901]
- AFOSR [FA9550-08-1-0325]
- Laboratory Directed Research and Development (LDRD) project at Sandia National Laboratories
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1240933] Funding Source: National Science Foundation
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We report in situ tensile strength measurement of fully lithiated Si (Li-Si alloy) nanowires inside a transmission electron microscope. A specially designed dual probe with an atomic force microscopy cantilever and a scanning tunneling microscopy electrode was used to conduct lithiation of Si nanowires and then perform in situ tension of the lithiated nanowires. The axial tensile strength decreased from the initial value of 3.6 GPa for the pristine unlithiated Si nanowires to 0.72 GPa for the lithiated Li-Si alloy. We observed large fracture strain ranging from 8% to 16% for Li-Si alloy, 70% of which remained permanent after fracture. This indicates a certain degree of tensile plasticity in the lithiated silicon before fracture, Important for constitutive modeling of the lithium-ion battery cyclability. We also compare the ab initio computed ideal strengths with our measured strengths and attribute the differences to the morphology and flaws in the lithiated nanowires.
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