Journal
JOURNAL OF POWER SOURCES
Volume 87, Issue 1-2, Pages 1-3Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0378-7753(99)00359-6
Keywords
microcracking; fracture toughness; Li-alloys; anodes; indentation; brittle
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Indentation fracture toughness measurements yielded a K-IC for Li4.4Sn equal to 0.8 +/- 0.2 MPa m(1/2). From K-IC, a critical crack length of 0.005 nm was determined for the stress generated due to the volume expansion as a result of Li charging into the Li4.4Sn alloy. The critical crack length was in excellent agreement with the predicted critical grain size for microcracking. This suggests that the model for predicting the critical grain size for microcracking during Li charging into brittle single-phase alloys is correct. (C) 2000 Elsevier Science S.A. All rights reserved.
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