Journal
SCRIPTA MATERIALIA
Volume 116, Issue -, Pages 62-66Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.01.023
Keywords
Lithium-ion batteries; Fracture toughness; Pillar splitting; Nanoindentation; FIB
Categories
Funding
- European FP7 Project, iSTRESS [604646]
- European Commission within the FP7 Marie Curie Initial Training Network Nanomotion [290158]
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An optimized nanoindentation pillar splitting technique is used for the fracture toughness measurement of spinel LixMn2O4 cathode material under different states of charge (SoC), along with the high-speed nanoindentation results for nanomechanical property mapping. High-speed nanoindentation enables for a robust and efficient evaluation of elastic modulus and hardness as a function of the SoC on strongly heterogeneous materials. The fracture toughness decreases linearly upon de-lithiation, with an overall reduction of 53% from 0% to 100% SoC. Decrease in fracture toughness is associated with the volume change, increase of defect density and stresses related to diffusion of lithium upon de-lithiation. (C) 2016 Elsevier Ltd. All rights reserved.
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