Young's modulus of polycrystalline Li 22Si 5

• Published in: Journal of power sources Vol. 196; no. 18; pp. 7747 - 7749
• Main Authors: Ratchford, J.B., Schuster, B.E., Crawford, B.A., Lundgren, C.A., Allen, J.L., Wolfenstine, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2011
• Subjects: Li 22Si 5; Lithium; Nanoindentation; Silicon; Young's modulus; Young's modulus; Li 22Si 5; Nanoindentation; Lithium; Silicon
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2011.04.042

► Knowledge of the mechanical properties for Li–Si alloys is crucial to use these high capacity materials within Li-ion batteries. ► For the first time, Young's modulus was measured for Li 22Si 5. The value was 35.4 ± 4.3 GPa. ► The experimental value of Young's modulus was lower than a previously reported value that was predicted using density functional theory. This difference was not a result of the testing procedure or microstructural variables. In order for Li–Si alloys to be used in Li-ion batteries as anodes, knowledge of their mechanical properties, such as Young's moduli, is crucial. Young's modulus of polycrystalline Li 22Si 5 was determined from nanoindentation testing. The value of Young's modulus was 35.4 ± 4.3 GPa. This value is approximately one-half of the predicted value based on density functional theory calculations. This difference was not a result of the testing procedure or microstructural variables.