Journal
JOURNAL OF POWER SOURCES
Volume 242, Issue -, Pages 732-735Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.05.121
Keywords
Li-ion batteries; Silicon; Alloy; Elastic modulus; High pressure; In-situ X-ray diffraction
Funding
- EFree, an Energy Frontier Research Center
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SG0001057]
- CIW
- CDAC
- UNLV
- LLNL
- DOE-NNSA
- DOE-BES
- NSF
- DOE-BES [DE-AC02-06CH11357]
- NSF [EAR-0622171, EAR 06-49658, EAR 10-43050]
- DOE [DE-FG02-94ER14466]
- COMPRES
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy under the Batteries for Advanced Transportation Technologies (BATT) Program [DE-AC02-05CH11231, 6951379]
- Zhejiang Provincial Natural Science Foundation of China [R6100325]
- Science and Technology Innovative Research Team of Zhejiang Province [2009R50010]
- China Postdoctoral Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1126249] Funding Source: National Science Foundation
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Pure body-center-cubic structured metastable polycrystalline Li15Si4 was synthesized in a Li-ion battery by electrochemically lithiating a thin Si wafer. Its stability and compressional behavior were investigated using in-situ high-pressure synchrotron X-ray diffraction (XRD) at room temperature. No phase transition was observed in polycrystalline Li15Si4 up to 5.8 GPa. A bulk modulus of 28.4(6) GPa was obtained for Li15Si4 by fitting the XRD data to a third order Birch-Murnaghan equation of state. We found that the bulk modulus of Li15Si4 follows a linear interpolation relationship between the bulk moduli for pure Li and Si. These results provide valuable experimental data to validate the theoretical calculation and are also important inputs for modeling the Li-Si system. (C) 2013 Elsevier B.V. All rights reserved.
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